802017a04b
The point of this is to be able to add RACCT (with RACCT_DISABLED) to GENERIC, to avoid having to rebuild the kernel to use rctl(8). Differential Revision: https://reviews.freebsd.org/D2369 Reviewed by: kib@ MFC after: 1 month Relnotes: yes Sponsored by: The FreeBSD Foundation
3873 lines
87 KiB
C
3873 lines
87 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1989, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_descrip.c 8.6 (Berkeley) 4/19/94
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_capsicum.h"
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#include "opt_compat.h"
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#include "opt_ddb.h"
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#include "opt_ktrace.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/capsicum.h>
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#include <sys/conf.h>
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#include <sys/fcntl.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/filio.h>
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#include <sys/jail.h>
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#include <sys/kernel.h>
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#include <sys/limits.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/mutex.h>
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#include <sys/namei.h>
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#include <sys/selinfo.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/protosw.h>
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#include <sys/racct.h>
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#include <sys/resourcevar.h>
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#include <sys/sbuf.h>
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#include <sys/signalvar.h>
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#include <sys/socketvar.h>
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#include <sys/stat.h>
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#include <sys/sx.h>
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#include <sys/syscallsubr.h>
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#include <sys/sysctl.h>
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#include <sys/sysproto.h>
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#include <sys/unistd.h>
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#include <sys/user.h>
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#include <sys/vnode.h>
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#ifdef KTRACE
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#include <sys/ktrace.h>
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#endif
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#include <net/vnet.h>
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#include <security/audit/audit.h>
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#include <vm/uma.h>
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#include <vm/vm.h>
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#include <ddb/ddb.h>
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static MALLOC_DEFINE(M_FILEDESC, "filedesc", "Open file descriptor table");
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static MALLOC_DEFINE(M_FILEDESC_TO_LEADER, "filedesc_to_leader",
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"file desc to leader structures");
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static MALLOC_DEFINE(M_SIGIO, "sigio", "sigio structures");
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MALLOC_DEFINE(M_FILECAPS, "filecaps", "descriptor capabilities");
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MALLOC_DECLARE(M_FADVISE);
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static uma_zone_t file_zone;
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static uma_zone_t filedesc0_zone;
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static int closefp(struct filedesc *fdp, int fd, struct file *fp,
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struct thread *td, int holdleaders);
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static int do_dup(struct thread *td, int flags, int old, int new);
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static int fd_first_free(struct filedesc *fdp, int low, int size);
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static int fd_last_used(struct filedesc *fdp, int size);
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static void fdgrowtable(struct filedesc *fdp, int nfd);
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static void fdgrowtable_exp(struct filedesc *fdp, int nfd);
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static void fdunused(struct filedesc *fdp, int fd);
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static void fdused(struct filedesc *fdp, int fd);
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static int getmaxfd(struct proc *p);
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/* Flags for do_dup() */
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#define DUP_FIXED 0x1 /* Force fixed allocation. */
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#define DUP_FCNTL 0x2 /* fcntl()-style errors. */
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#define DUP_CLOEXEC 0x4 /* Atomically set FD_CLOEXEC. */
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/*
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* Each process has:
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*
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* - An array of open file descriptors (fd_ofiles)
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* - An array of file flags (fd_ofileflags)
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* - A bitmap recording which descriptors are in use (fd_map)
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*
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* A process starts out with NDFILE descriptors. The value of NDFILE has
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* been selected based the historical limit of 20 open files, and an
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* assumption that the majority of processes, especially short-lived
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* processes like shells, will never need more.
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*
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* If this initial allocation is exhausted, a larger descriptor table and
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* map are allocated dynamically, and the pointers in the process's struct
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* filedesc are updated to point to those. This is repeated every time
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* the process runs out of file descriptors (provided it hasn't hit its
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* resource limit).
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*
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* Since threads may hold references to individual descriptor table
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* entries, the tables are never freed. Instead, they are placed on a
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* linked list and freed only when the struct filedesc is released.
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*/
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#define NDFILE 20
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#define NDSLOTSIZE sizeof(NDSLOTTYPE)
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#define NDENTRIES (NDSLOTSIZE * __CHAR_BIT)
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#define NDSLOT(x) ((x) / NDENTRIES)
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#define NDBIT(x) ((NDSLOTTYPE)1 << ((x) % NDENTRIES))
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#define NDSLOTS(x) (((x) + NDENTRIES - 1) / NDENTRIES)
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/*
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* SLIST entry used to keep track of ofiles which must be reclaimed when
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* the process exits.
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*/
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struct freetable {
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struct fdescenttbl *ft_table;
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SLIST_ENTRY(freetable) ft_next;
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};
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/*
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* Initial allocation: a filedesc structure + the head of SLIST used to
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* keep track of old ofiles + enough space for NDFILE descriptors.
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*/
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struct fdescenttbl0 {
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int fdt_nfiles;
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struct filedescent fdt_ofiles[NDFILE];
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};
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struct filedesc0 {
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struct filedesc fd_fd;
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SLIST_HEAD(, freetable) fd_free;
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struct fdescenttbl0 fd_dfiles;
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NDSLOTTYPE fd_dmap[NDSLOTS(NDFILE)];
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};
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/*
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* Descriptor management.
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*/
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volatile int openfiles; /* actual number of open files */
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struct mtx sigio_lock; /* mtx to protect pointers to sigio */
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void (*mq_fdclose)(struct thread *td, int fd, struct file *fp);
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/* A mutex to protect the association between a proc and filedesc. */
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static struct mtx fdesc_mtx;
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/*
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* If low >= size, just return low. Otherwise find the first zero bit in the
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* given bitmap, starting at low and not exceeding size - 1. Return size if
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* not found.
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*/
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static int
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fd_first_free(struct filedesc *fdp, int low, int size)
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{
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NDSLOTTYPE *map = fdp->fd_map;
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NDSLOTTYPE mask;
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int off, maxoff;
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if (low >= size)
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return (low);
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off = NDSLOT(low);
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if (low % NDENTRIES) {
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mask = ~(~(NDSLOTTYPE)0 >> (NDENTRIES - (low % NDENTRIES)));
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if ((mask &= ~map[off]) != 0UL)
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return (off * NDENTRIES + ffsl(mask) - 1);
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++off;
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}
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for (maxoff = NDSLOTS(size); off < maxoff; ++off)
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if (map[off] != ~0UL)
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return (off * NDENTRIES + ffsl(~map[off]) - 1);
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return (size);
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}
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/*
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* Find the highest non-zero bit in the given bitmap, starting at 0 and
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* not exceeding size - 1. Return -1 if not found.
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*/
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static int
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fd_last_used(struct filedesc *fdp, int size)
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{
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NDSLOTTYPE *map = fdp->fd_map;
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NDSLOTTYPE mask;
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int off, minoff;
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off = NDSLOT(size);
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if (size % NDENTRIES) {
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mask = ~(~(NDSLOTTYPE)0 << (size % NDENTRIES));
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if ((mask &= map[off]) != 0)
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return (off * NDENTRIES + flsl(mask) - 1);
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--off;
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}
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for (minoff = NDSLOT(0); off >= minoff; --off)
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if (map[off] != 0)
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return (off * NDENTRIES + flsl(map[off]) - 1);
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return (-1);
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}
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#ifdef INVARIANTS
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static int
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fdisused(struct filedesc *fdp, int fd)
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{
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KASSERT(fd >= 0 && fd < fdp->fd_nfiles,
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("file descriptor %d out of range (0, %d)", fd, fdp->fd_nfiles));
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return ((fdp->fd_map[NDSLOT(fd)] & NDBIT(fd)) != 0);
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}
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#endif
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/*
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* Mark a file descriptor as used.
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*/
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static void
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fdused_init(struct filedesc *fdp, int fd)
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{
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KASSERT(!fdisused(fdp, fd), ("fd=%d is already used", fd));
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fdp->fd_map[NDSLOT(fd)] |= NDBIT(fd);
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}
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static void
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fdused(struct filedesc *fdp, int fd)
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{
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FILEDESC_XLOCK_ASSERT(fdp);
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fdused_init(fdp, fd);
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if (fd > fdp->fd_lastfile)
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fdp->fd_lastfile = fd;
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if (fd == fdp->fd_freefile)
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fdp->fd_freefile = fd_first_free(fdp, fd, fdp->fd_nfiles);
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}
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/*
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* Mark a file descriptor as unused.
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*/
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static void
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fdunused(struct filedesc *fdp, int fd)
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{
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FILEDESC_XLOCK_ASSERT(fdp);
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KASSERT(fdisused(fdp, fd), ("fd=%d is already unused", fd));
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KASSERT(fdp->fd_ofiles[fd].fde_file == NULL,
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("fd=%d is still in use", fd));
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fdp->fd_map[NDSLOT(fd)] &= ~NDBIT(fd);
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if (fd < fdp->fd_freefile)
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fdp->fd_freefile = fd;
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if (fd == fdp->fd_lastfile)
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fdp->fd_lastfile = fd_last_used(fdp, fd);
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}
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/*
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* Free a file descriptor.
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*
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* Avoid some work if fdp is about to be destroyed.
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*/
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static inline void
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fdefree_last(struct filedescent *fde)
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{
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filecaps_free(&fde->fde_caps);
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}
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static inline void
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fdfree(struct filedesc *fdp, int fd)
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{
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struct filedescent *fde;
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fde = &fdp->fd_ofiles[fd];
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#ifdef CAPABILITIES
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seq_write_begin(&fde->fde_seq);
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#endif
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fdefree_last(fde);
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bzero(fde, fde_change_size);
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fdunused(fdp, fd);
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#ifdef CAPABILITIES
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seq_write_end(&fde->fde_seq);
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#endif
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}
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/*
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* System calls on descriptors.
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct getdtablesize_args {
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int dummy;
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};
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#endif
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/* ARGSUSED */
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int
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sys_getdtablesize(struct thread *td, struct getdtablesize_args *uap)
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{
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struct proc *p = td->td_proc;
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uint64_t lim;
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PROC_LOCK(p);
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td->td_retval[0] =
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min((int)lim_cur(p, RLIMIT_NOFILE), maxfilesperproc);
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lim = racct_get_limit(td->td_proc, RACCT_NOFILE);
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PROC_UNLOCK(p);
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if (lim < td->td_retval[0])
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td->td_retval[0] = lim;
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return (0);
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}
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/*
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* Duplicate a file descriptor to a particular value.
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*
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* Note: keep in mind that a potential race condition exists when closing
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* descriptors from a shared descriptor table (via rfork).
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct dup2_args {
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u_int from;
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u_int to;
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};
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#endif
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/* ARGSUSED */
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int
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sys_dup2(struct thread *td, struct dup2_args *uap)
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{
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return (do_dup(td, DUP_FIXED, (int)uap->from, (int)uap->to));
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}
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/*
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* Duplicate a file descriptor.
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct dup_args {
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u_int fd;
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};
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#endif
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/* ARGSUSED */
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int
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sys_dup(struct thread *td, struct dup_args *uap)
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{
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return (do_dup(td, 0, (int)uap->fd, 0));
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}
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|
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/*
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* The file control system call.
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct fcntl_args {
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int fd;
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int cmd;
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long arg;
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};
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#endif
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/* ARGSUSED */
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int
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sys_fcntl(struct thread *td, struct fcntl_args *uap)
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{
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return (kern_fcntl_freebsd(td, uap->fd, uap->cmd, uap->arg));
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}
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int
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kern_fcntl_freebsd(struct thread *td, int fd, int cmd, long arg)
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{
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struct flock fl;
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struct __oflock ofl;
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intptr_t arg1;
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int error;
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error = 0;
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switch (cmd) {
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case F_OGETLK:
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case F_OSETLK:
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case F_OSETLKW:
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/*
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* Convert old flock structure to new.
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*/
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error = copyin((void *)(intptr_t)arg, &ofl, sizeof(ofl));
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fl.l_start = ofl.l_start;
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fl.l_len = ofl.l_len;
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fl.l_pid = ofl.l_pid;
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fl.l_type = ofl.l_type;
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fl.l_whence = ofl.l_whence;
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fl.l_sysid = 0;
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switch (cmd) {
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case F_OGETLK:
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cmd = F_GETLK;
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break;
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case F_OSETLK:
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cmd = F_SETLK;
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break;
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case F_OSETLKW:
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cmd = F_SETLKW;
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break;
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}
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arg1 = (intptr_t)&fl;
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break;
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case F_GETLK:
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|
case F_SETLK:
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|
case F_SETLKW:
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case F_SETLK_REMOTE:
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error = copyin((void *)(intptr_t)arg, &fl, sizeof(fl));
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arg1 = (intptr_t)&fl;
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break;
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default:
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arg1 = arg;
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break;
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}
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if (error)
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return (error);
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error = kern_fcntl(td, fd, cmd, arg1);
|
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if (error)
|
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return (error);
|
|
if (cmd == F_OGETLK) {
|
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ofl.l_start = fl.l_start;
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|
ofl.l_len = fl.l_len;
|
|
ofl.l_pid = fl.l_pid;
|
|
ofl.l_type = fl.l_type;
|
|
ofl.l_whence = fl.l_whence;
|
|
error = copyout(&ofl, (void *)(intptr_t)arg, sizeof(ofl));
|
|
} else if (cmd == F_GETLK) {
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|
error = copyout(&fl, (void *)(intptr_t)arg, sizeof(fl));
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
int
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|
kern_fcntl(struct thread *td, int fd, int cmd, intptr_t arg)
|
|
{
|
|
struct filedesc *fdp;
|
|
struct flock *flp;
|
|
struct file *fp, *fp2;
|
|
struct filedescent *fde;
|
|
struct proc *p;
|
|
struct vnode *vp;
|
|
cap_rights_t rights;
|
|
int error, flg, tmp;
|
|
uint64_t bsize;
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|
off_t foffset;
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|
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|
error = 0;
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flg = F_POSIX;
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p = td->td_proc;
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|
fdp = p->p_fd;
|
|
|
|
switch (cmd) {
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|
case F_DUPFD:
|
|
tmp = arg;
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|
error = do_dup(td, DUP_FCNTL, fd, tmp);
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|
break;
|
|
|
|
case F_DUPFD_CLOEXEC:
|
|
tmp = arg;
|
|
error = do_dup(td, DUP_FCNTL | DUP_CLOEXEC, fd, tmp);
|
|
break;
|
|
|
|
case F_DUP2FD:
|
|
tmp = arg;
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|
error = do_dup(td, DUP_FIXED, fd, tmp);
|
|
break;
|
|
|
|
case F_DUP2FD_CLOEXEC:
|
|
tmp = arg;
|
|
error = do_dup(td, DUP_FIXED | DUP_CLOEXEC, fd, tmp);
|
|
break;
|
|
|
|
case F_GETFD:
|
|
FILEDESC_SLOCK(fdp);
|
|
if (fget_locked(fdp, fd) == NULL) {
|
|
FILEDESC_SUNLOCK(fdp);
|
|
error = EBADF;
|
|
break;
|
|
}
|
|
fde = &fdp->fd_ofiles[fd];
|
|
td->td_retval[0] =
|
|
(fde->fde_flags & UF_EXCLOSE) ? FD_CLOEXEC : 0;
|
|
FILEDESC_SUNLOCK(fdp);
|
|
break;
|
|
|
|
case F_SETFD:
|
|
FILEDESC_XLOCK(fdp);
|
|
if (fget_locked(fdp, fd) == NULL) {
|
|
FILEDESC_XUNLOCK(fdp);
|
|
error = EBADF;
|
|
break;
|
|
}
|
|
fde = &fdp->fd_ofiles[fd];
|
|
fde->fde_flags = (fde->fde_flags & ~UF_EXCLOSE) |
|
|
(arg & FD_CLOEXEC ? UF_EXCLOSE : 0);
|
|
FILEDESC_XUNLOCK(fdp);
|
|
break;
|
|
|
|
case F_GETFL:
|
|
error = fget_fcntl(td, fd,
|
|
cap_rights_init(&rights, CAP_FCNTL), F_GETFL, &fp);
|
|
if (error != 0)
|
|
break;
|
|
td->td_retval[0] = OFLAGS(fp->f_flag);
|
|
fdrop(fp, td);
|
|
break;
|
|
|
|
case F_SETFL:
|
|
error = fget_fcntl(td, fd,
|
|
cap_rights_init(&rights, CAP_FCNTL), F_SETFL, &fp);
|
|
if (error != 0)
|
|
break;
|
|
do {
|
|
tmp = flg = fp->f_flag;
|
|
tmp &= ~FCNTLFLAGS;
|
|
tmp |= FFLAGS(arg & ~O_ACCMODE) & FCNTLFLAGS;
|
|
} while(atomic_cmpset_int(&fp->f_flag, flg, tmp) == 0);
|
|
tmp = fp->f_flag & FNONBLOCK;
|
|
error = fo_ioctl(fp, FIONBIO, &tmp, td->td_ucred, td);
|
|
if (error != 0) {
|
|
fdrop(fp, td);
|
|
break;
|
|
}
|
|
tmp = fp->f_flag & FASYNC;
|
|
error = fo_ioctl(fp, FIOASYNC, &tmp, td->td_ucred, td);
|
|
if (error == 0) {
|
|
fdrop(fp, td);
|
|
break;
|
|
}
|
|
atomic_clear_int(&fp->f_flag, FNONBLOCK);
|
|
tmp = 0;
|
|
(void)fo_ioctl(fp, FIONBIO, &tmp, td->td_ucred, td);
|
|
fdrop(fp, td);
|
|
break;
|
|
|
|
case F_GETOWN:
|
|
error = fget_fcntl(td, fd,
|
|
cap_rights_init(&rights, CAP_FCNTL), F_GETOWN, &fp);
|
|
if (error != 0)
|
|
break;
|
|
error = fo_ioctl(fp, FIOGETOWN, &tmp, td->td_ucred, td);
|
|
if (error == 0)
|
|
td->td_retval[0] = tmp;
|
|
fdrop(fp, td);
|
|
break;
|
|
|
|
case F_SETOWN:
|
|
error = fget_fcntl(td, fd,
|
|
cap_rights_init(&rights, CAP_FCNTL), F_SETOWN, &fp);
|
|
if (error != 0)
|
|
break;
|
|
tmp = arg;
|
|
error = fo_ioctl(fp, FIOSETOWN, &tmp, td->td_ucred, td);
|
|
fdrop(fp, td);
|
|
break;
|
|
|
|
case F_SETLK_REMOTE:
|
|
error = priv_check(td, PRIV_NFS_LOCKD);
|
|
if (error)
|
|
return (error);
|
|
flg = F_REMOTE;
|
|
goto do_setlk;
|
|
|
|
case F_SETLKW:
|
|
flg |= F_WAIT;
|
|
/* FALLTHROUGH F_SETLK */
|
|
|
|
case F_SETLK:
|
|
do_setlk:
|
|
cap_rights_init(&rights, CAP_FLOCK);
|
|
error = fget_unlocked(fdp, fd, &rights, &fp, NULL);
|
|
if (error != 0)
|
|
break;
|
|
if (fp->f_type != DTYPE_VNODE) {
|
|
error = EBADF;
|
|
fdrop(fp, td);
|
|
break;
|
|
}
|
|
|
|
flp = (struct flock *)arg;
|
|
if (flp->l_whence == SEEK_CUR) {
|
|
foffset = foffset_get(fp);
|
|
if (foffset < 0 ||
|
|
(flp->l_start > 0 &&
|
|
foffset > OFF_MAX - flp->l_start)) {
|
|
FILEDESC_SUNLOCK(fdp);
|
|
error = EOVERFLOW;
|
|
fdrop(fp, td);
|
|
break;
|
|
}
|
|
flp->l_start += foffset;
|
|
}
|
|
|
|
vp = fp->f_vnode;
|
|
switch (flp->l_type) {
|
|
case F_RDLCK:
|
|
if ((fp->f_flag & FREAD) == 0) {
|
|
error = EBADF;
|
|
break;
|
|
}
|
|
PROC_LOCK(p->p_leader);
|
|
p->p_leader->p_flag |= P_ADVLOCK;
|
|
PROC_UNLOCK(p->p_leader);
|
|
error = VOP_ADVLOCK(vp, (caddr_t)p->p_leader, F_SETLK,
|
|
flp, flg);
|
|
break;
|
|
case F_WRLCK:
|
|
if ((fp->f_flag & FWRITE) == 0) {
|
|
error = EBADF;
|
|
break;
|
|
}
|
|
PROC_LOCK(p->p_leader);
|
|
p->p_leader->p_flag |= P_ADVLOCK;
|
|
PROC_UNLOCK(p->p_leader);
|
|
error = VOP_ADVLOCK(vp, (caddr_t)p->p_leader, F_SETLK,
|
|
flp, flg);
|
|
break;
|
|
case F_UNLCK:
|
|
error = VOP_ADVLOCK(vp, (caddr_t)p->p_leader, F_UNLCK,
|
|
flp, flg);
|
|
break;
|
|
case F_UNLCKSYS:
|
|
/*
|
|
* Temporary api for testing remote lock
|
|
* infrastructure.
|
|
*/
|
|
if (flg != F_REMOTE) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
error = VOP_ADVLOCK(vp, (caddr_t)p->p_leader,
|
|
F_UNLCKSYS, flp, flg);
|
|
break;
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
if (error != 0 || flp->l_type == F_UNLCK ||
|
|
flp->l_type == F_UNLCKSYS) {
|
|
fdrop(fp, td);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Check for a race with close.
|
|
*
|
|
* The vnode is now advisory locked (or unlocked, but this case
|
|
* is not really important) as the caller requested.
|
|
* We had to drop the filedesc lock, so we need to recheck if
|
|
* the descriptor is still valid, because if it was closed
|
|
* in the meantime we need to remove advisory lock from the
|
|
* vnode - close on any descriptor leading to an advisory
|
|
* locked vnode, removes that lock.
|
|
* We will return 0 on purpose in that case, as the result of
|
|
* successful advisory lock might have been externally visible
|
|
* already. This is fine - effectively we pretend to the caller
|
|
* that the closing thread was a bit slower and that the
|
|
* advisory lock succeeded before the close.
|
|
*/
|
|
error = fget_unlocked(fdp, fd, &rights, &fp2, NULL);
|
|
if (error != 0) {
|
|
fdrop(fp, td);
|
|
break;
|
|
}
|
|
if (fp != fp2) {
|
|
flp->l_whence = SEEK_SET;
|
|
flp->l_start = 0;
|
|
flp->l_len = 0;
|
|
flp->l_type = F_UNLCK;
|
|
(void) VOP_ADVLOCK(vp, (caddr_t)p->p_leader,
|
|
F_UNLCK, flp, F_POSIX);
|
|
}
|
|
fdrop(fp, td);
|
|
fdrop(fp2, td);
|
|
break;
|
|
|
|
case F_GETLK:
|
|
error = fget_unlocked(fdp, fd,
|
|
cap_rights_init(&rights, CAP_FLOCK), &fp, NULL);
|
|
if (error != 0)
|
|
break;
|
|
if (fp->f_type != DTYPE_VNODE) {
|
|
error = EBADF;
|
|
fdrop(fp, td);
|
|
break;
|
|
}
|
|
flp = (struct flock *)arg;
|
|
if (flp->l_type != F_RDLCK && flp->l_type != F_WRLCK &&
|
|
flp->l_type != F_UNLCK) {
|
|
error = EINVAL;
|
|
fdrop(fp, td);
|
|
break;
|
|
}
|
|
if (flp->l_whence == SEEK_CUR) {
|
|
foffset = foffset_get(fp);
|
|
if ((flp->l_start > 0 &&
|
|
foffset > OFF_MAX - flp->l_start) ||
|
|
(flp->l_start < 0 &&
|
|
foffset < OFF_MIN - flp->l_start)) {
|
|
FILEDESC_SUNLOCK(fdp);
|
|
error = EOVERFLOW;
|
|
fdrop(fp, td);
|
|
break;
|
|
}
|
|
flp->l_start += foffset;
|
|
}
|
|
vp = fp->f_vnode;
|
|
error = VOP_ADVLOCK(vp, (caddr_t)p->p_leader, F_GETLK, flp,
|
|
F_POSIX);
|
|
fdrop(fp, td);
|
|
break;
|
|
|
|
case F_RDAHEAD:
|
|
arg = arg ? 128 * 1024: 0;
|
|
/* FALLTHROUGH */
|
|
case F_READAHEAD:
|
|
error = fget_unlocked(fdp, fd, NULL, &fp, NULL);
|
|
if (error != 0)
|
|
break;
|
|
if (fp->f_type != DTYPE_VNODE) {
|
|
fdrop(fp, td);
|
|
error = EBADF;
|
|
break;
|
|
}
|
|
vp = fp->f_vnode;
|
|
/*
|
|
* Exclusive lock synchronizes against f_seqcount reads and
|
|
* writes in sequential_heuristic().
|
|
*/
|
|
error = vn_lock(vp, LK_EXCLUSIVE);
|
|
if (error != 0) {
|
|
fdrop(fp, td);
|
|
break;
|
|
}
|
|
if (arg >= 0) {
|
|
bsize = fp->f_vnode->v_mount->mnt_stat.f_iosize;
|
|
fp->f_seqcount = (arg + bsize - 1) / bsize;
|
|
atomic_set_int(&fp->f_flag, FRDAHEAD);
|
|
} else {
|
|
atomic_clear_int(&fp->f_flag, FRDAHEAD);
|
|
}
|
|
VOP_UNLOCK(vp, 0);
|
|
fdrop(fp, td);
|
|
break;
|
|
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
getmaxfd(struct proc *p)
|
|
{
|
|
int maxfd;
|
|
|
|
PROC_LOCK(p);
|
|
maxfd = min((int)lim_cur(p, RLIMIT_NOFILE), maxfilesperproc);
|
|
PROC_UNLOCK(p);
|
|
|
|
return (maxfd);
|
|
}
|
|
|
|
/*
|
|
* Common code for dup, dup2, fcntl(F_DUPFD) and fcntl(F_DUP2FD).
|
|
*/
|
|
static int
|
|
do_dup(struct thread *td, int flags, int old, int new)
|
|
{
|
|
struct filedesc *fdp;
|
|
struct filedescent *oldfde, *newfde;
|
|
struct proc *p;
|
|
struct file *fp;
|
|
struct file *delfp;
|
|
int error, maxfd;
|
|
|
|
p = td->td_proc;
|
|
fdp = p->p_fd;
|
|
|
|
/*
|
|
* Verify we have a valid descriptor to dup from and possibly to
|
|
* dup to. Unlike dup() and dup2(), fcntl()'s F_DUPFD should
|
|
* return EINVAL when the new descriptor is out of bounds.
|
|
*/
|
|
if (old < 0)
|
|
return (EBADF);
|
|
if (new < 0)
|
|
return (flags & DUP_FCNTL ? EINVAL : EBADF);
|
|
maxfd = getmaxfd(p);
|
|
if (new >= maxfd)
|
|
return (flags & DUP_FCNTL ? EINVAL : EBADF);
|
|
|
|
FILEDESC_XLOCK(fdp);
|
|
if (fget_locked(fdp, old) == NULL) {
|
|
FILEDESC_XUNLOCK(fdp);
|
|
return (EBADF);
|
|
}
|
|
oldfde = &fdp->fd_ofiles[old];
|
|
if (flags & DUP_FIXED && old == new) {
|
|
td->td_retval[0] = new;
|
|
if (flags & DUP_CLOEXEC)
|
|
fdp->fd_ofiles[new].fde_flags |= UF_EXCLOSE;
|
|
FILEDESC_XUNLOCK(fdp);
|
|
return (0);
|
|
}
|
|
fp = oldfde->fde_file;
|
|
fhold(fp);
|
|
|
|
/*
|
|
* If the caller specified a file descriptor, make sure the file
|
|
* table is large enough to hold it, and grab it. Otherwise, just
|
|
* allocate a new descriptor the usual way.
|
|
*/
|
|
if (flags & DUP_FIXED) {
|
|
if (new >= fdp->fd_nfiles) {
|
|
/*
|
|
* The resource limits are here instead of e.g.
|
|
* fdalloc(), because the file descriptor table may be
|
|
* shared between processes, so we can't really use
|
|
* racct_add()/racct_sub(). Instead of counting the
|
|
* number of actually allocated descriptors, just put
|
|
* the limit on the size of the file descriptor table.
|
|
*/
|
|
#ifdef RACCT
|
|
if (racct_enable) {
|
|
PROC_LOCK(p);
|
|
error = racct_set(p, RACCT_NOFILE, new + 1);
|
|
PROC_UNLOCK(p);
|
|
if (error != 0) {
|
|
FILEDESC_XUNLOCK(fdp);
|
|
fdrop(fp, td);
|
|
return (EMFILE);
|
|
}
|
|
}
|
|
#endif
|
|
fdgrowtable_exp(fdp, new + 1);
|
|
oldfde = &fdp->fd_ofiles[old];
|
|
}
|
|
newfde = &fdp->fd_ofiles[new];
|
|
if (newfde->fde_file == NULL)
|
|
fdused(fdp, new);
|
|
} else {
|
|
if ((error = fdalloc(td, new, &new)) != 0) {
|
|
FILEDESC_XUNLOCK(fdp);
|
|
fdrop(fp, td);
|
|
return (error);
|
|
}
|
|
newfde = &fdp->fd_ofiles[new];
|
|
}
|
|
|
|
KASSERT(fp == oldfde->fde_file, ("old fd has been modified"));
|
|
KASSERT(old != new, ("new fd is same as old"));
|
|
|
|
delfp = newfde->fde_file;
|
|
|
|
/*
|
|
* Duplicate the source descriptor.
|
|
*/
|
|
#ifdef CAPABILITIES
|
|
seq_write_begin(&newfde->fde_seq);
|
|
#endif
|
|
filecaps_free(&newfde->fde_caps);
|
|
memcpy(newfde, oldfde, fde_change_size);
|
|
filecaps_copy(&oldfde->fde_caps, &newfde->fde_caps);
|
|
if ((flags & DUP_CLOEXEC) != 0)
|
|
newfde->fde_flags = oldfde->fde_flags | UF_EXCLOSE;
|
|
else
|
|
newfde->fde_flags = oldfde->fde_flags & ~UF_EXCLOSE;
|
|
#ifdef CAPABILITIES
|
|
seq_write_end(&newfde->fde_seq);
|
|
#endif
|
|
td->td_retval[0] = new;
|
|
|
|
if (delfp != NULL) {
|
|
(void) closefp(fdp, new, delfp, td, 1);
|
|
/* closefp() drops the FILEDESC lock for us. */
|
|
} else {
|
|
FILEDESC_XUNLOCK(fdp);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* If sigio is on the list associated with a process or process group,
|
|
* disable signalling from the device, remove sigio from the list and
|
|
* free sigio.
|
|
*/
|
|
void
|
|
funsetown(struct sigio **sigiop)
|
|
{
|
|
struct sigio *sigio;
|
|
|
|
SIGIO_LOCK();
|
|
sigio = *sigiop;
|
|
if (sigio == NULL) {
|
|
SIGIO_UNLOCK();
|
|
return;
|
|
}
|
|
*(sigio->sio_myref) = NULL;
|
|
if ((sigio)->sio_pgid < 0) {
|
|
struct pgrp *pg = (sigio)->sio_pgrp;
|
|
PGRP_LOCK(pg);
|
|
SLIST_REMOVE(&sigio->sio_pgrp->pg_sigiolst, sigio,
|
|
sigio, sio_pgsigio);
|
|
PGRP_UNLOCK(pg);
|
|
} else {
|
|
struct proc *p = (sigio)->sio_proc;
|
|
PROC_LOCK(p);
|
|
SLIST_REMOVE(&sigio->sio_proc->p_sigiolst, sigio,
|
|
sigio, sio_pgsigio);
|
|
PROC_UNLOCK(p);
|
|
}
|
|
SIGIO_UNLOCK();
|
|
crfree(sigio->sio_ucred);
|
|
free(sigio, M_SIGIO);
|
|
}
|
|
|
|
/*
|
|
* Free a list of sigio structures.
|
|
* We only need to lock the SIGIO_LOCK because we have made ourselves
|
|
* inaccessible to callers of fsetown and therefore do not need to lock
|
|
* the proc or pgrp struct for the list manipulation.
|
|
*/
|
|
void
|
|
funsetownlst(struct sigiolst *sigiolst)
|
|
{
|
|
struct proc *p;
|
|
struct pgrp *pg;
|
|
struct sigio *sigio;
|
|
|
|
sigio = SLIST_FIRST(sigiolst);
|
|
if (sigio == NULL)
|
|
return;
|
|
p = NULL;
|
|
pg = NULL;
|
|
|
|
/*
|
|
* Every entry of the list should belong
|
|
* to a single proc or pgrp.
|
|
*/
|
|
if (sigio->sio_pgid < 0) {
|
|
pg = sigio->sio_pgrp;
|
|
PGRP_LOCK_ASSERT(pg, MA_NOTOWNED);
|
|
} else /* if (sigio->sio_pgid > 0) */ {
|
|
p = sigio->sio_proc;
|
|
PROC_LOCK_ASSERT(p, MA_NOTOWNED);
|
|
}
|
|
|
|
SIGIO_LOCK();
|
|
while ((sigio = SLIST_FIRST(sigiolst)) != NULL) {
|
|
*(sigio->sio_myref) = NULL;
|
|
if (pg != NULL) {
|
|
KASSERT(sigio->sio_pgid < 0,
|
|
("Proc sigio in pgrp sigio list"));
|
|
KASSERT(sigio->sio_pgrp == pg,
|
|
("Bogus pgrp in sigio list"));
|
|
PGRP_LOCK(pg);
|
|
SLIST_REMOVE(&pg->pg_sigiolst, sigio, sigio,
|
|
sio_pgsigio);
|
|
PGRP_UNLOCK(pg);
|
|
} else /* if (p != NULL) */ {
|
|
KASSERT(sigio->sio_pgid > 0,
|
|
("Pgrp sigio in proc sigio list"));
|
|
KASSERT(sigio->sio_proc == p,
|
|
("Bogus proc in sigio list"));
|
|
PROC_LOCK(p);
|
|
SLIST_REMOVE(&p->p_sigiolst, sigio, sigio,
|
|
sio_pgsigio);
|
|
PROC_UNLOCK(p);
|
|
}
|
|
SIGIO_UNLOCK();
|
|
crfree(sigio->sio_ucred);
|
|
free(sigio, M_SIGIO);
|
|
SIGIO_LOCK();
|
|
}
|
|
SIGIO_UNLOCK();
|
|
}
|
|
|
|
/*
|
|
* This is common code for FIOSETOWN ioctl called by fcntl(fd, F_SETOWN, arg).
|
|
*
|
|
* After permission checking, add a sigio structure to the sigio list for
|
|
* the process or process group.
|
|
*/
|
|
int
|
|
fsetown(pid_t pgid, struct sigio **sigiop)
|
|
{
|
|
struct proc *proc;
|
|
struct pgrp *pgrp;
|
|
struct sigio *sigio;
|
|
int ret;
|
|
|
|
if (pgid == 0) {
|
|
funsetown(sigiop);
|
|
return (0);
|
|
}
|
|
|
|
ret = 0;
|
|
|
|
/* Allocate and fill in the new sigio out of locks. */
|
|
sigio = malloc(sizeof(struct sigio), M_SIGIO, M_WAITOK);
|
|
sigio->sio_pgid = pgid;
|
|
sigio->sio_ucred = crhold(curthread->td_ucred);
|
|
sigio->sio_myref = sigiop;
|
|
|
|
sx_slock(&proctree_lock);
|
|
if (pgid > 0) {
|
|
proc = pfind(pgid);
|
|
if (proc == NULL) {
|
|
ret = ESRCH;
|
|
goto fail;
|
|
}
|
|
|
|
/*
|
|
* Policy - Don't allow a process to FSETOWN a process
|
|
* in another session.
|
|
*
|
|
* Remove this test to allow maximum flexibility or
|
|
* restrict FSETOWN to the current process or process
|
|
* group for maximum safety.
|
|
*/
|
|
PROC_UNLOCK(proc);
|
|
if (proc->p_session != curthread->td_proc->p_session) {
|
|
ret = EPERM;
|
|
goto fail;
|
|
}
|
|
|
|
pgrp = NULL;
|
|
} else /* if (pgid < 0) */ {
|
|
pgrp = pgfind(-pgid);
|
|
if (pgrp == NULL) {
|
|
ret = ESRCH;
|
|
goto fail;
|
|
}
|
|
PGRP_UNLOCK(pgrp);
|
|
|
|
/*
|
|
* Policy - Don't allow a process to FSETOWN a process
|
|
* in another session.
|
|
*
|
|
* Remove this test to allow maximum flexibility or
|
|
* restrict FSETOWN to the current process or process
|
|
* group for maximum safety.
|
|
*/
|
|
if (pgrp->pg_session != curthread->td_proc->p_session) {
|
|
ret = EPERM;
|
|
goto fail;
|
|
}
|
|
|
|
proc = NULL;
|
|
}
|
|
funsetown(sigiop);
|
|
if (pgid > 0) {
|
|
PROC_LOCK(proc);
|
|
/*
|
|
* Since funsetownlst() is called without the proctree
|
|
* locked, we need to check for P_WEXIT.
|
|
* XXX: is ESRCH correct?
|
|
*/
|
|
if ((proc->p_flag & P_WEXIT) != 0) {
|
|
PROC_UNLOCK(proc);
|
|
ret = ESRCH;
|
|
goto fail;
|
|
}
|
|
SLIST_INSERT_HEAD(&proc->p_sigiolst, sigio, sio_pgsigio);
|
|
sigio->sio_proc = proc;
|
|
PROC_UNLOCK(proc);
|
|
} else {
|
|
PGRP_LOCK(pgrp);
|
|
SLIST_INSERT_HEAD(&pgrp->pg_sigiolst, sigio, sio_pgsigio);
|
|
sigio->sio_pgrp = pgrp;
|
|
PGRP_UNLOCK(pgrp);
|
|
}
|
|
sx_sunlock(&proctree_lock);
|
|
SIGIO_LOCK();
|
|
*sigiop = sigio;
|
|
SIGIO_UNLOCK();
|
|
return (0);
|
|
|
|
fail:
|
|
sx_sunlock(&proctree_lock);
|
|
crfree(sigio->sio_ucred);
|
|
free(sigio, M_SIGIO);
|
|
return (ret);
|
|
}
|
|
|
|
/*
|
|
* This is common code for FIOGETOWN ioctl called by fcntl(fd, F_GETOWN, arg).
|
|
*/
|
|
pid_t
|
|
fgetown(sigiop)
|
|
struct sigio **sigiop;
|
|
{
|
|
pid_t pgid;
|
|
|
|
SIGIO_LOCK();
|
|
pgid = (*sigiop != NULL) ? (*sigiop)->sio_pgid : 0;
|
|
SIGIO_UNLOCK();
|
|
return (pgid);
|
|
}
|
|
|
|
/*
|
|
* Function drops the filedesc lock on return.
|
|
*/
|
|
static int
|
|
closefp(struct filedesc *fdp, int fd, struct file *fp, struct thread *td,
|
|
int holdleaders)
|
|
{
|
|
int error;
|
|
|
|
FILEDESC_XLOCK_ASSERT(fdp);
|
|
|
|
if (holdleaders) {
|
|
if (td->td_proc->p_fdtol != NULL) {
|
|
/*
|
|
* Ask fdfree() to sleep to ensure that all relevant
|
|
* process leaders can be traversed in closef().
|
|
*/
|
|
fdp->fd_holdleaderscount++;
|
|
} else {
|
|
holdleaders = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We now hold the fp reference that used to be owned by the
|
|
* descriptor array. We have to unlock the FILEDESC *AFTER*
|
|
* knote_fdclose to prevent a race of the fd getting opened, a knote
|
|
* added, and deleteing a knote for the new fd.
|
|
*/
|
|
knote_fdclose(td, fd);
|
|
|
|
/*
|
|
* We need to notify mqueue if the object is of type mqueue.
|
|
*/
|
|
if (fp->f_type == DTYPE_MQUEUE)
|
|
mq_fdclose(td, fd, fp);
|
|
FILEDESC_XUNLOCK(fdp);
|
|
|
|
error = closef(fp, td);
|
|
if (holdleaders) {
|
|
FILEDESC_XLOCK(fdp);
|
|
fdp->fd_holdleaderscount--;
|
|
if (fdp->fd_holdleaderscount == 0 &&
|
|
fdp->fd_holdleaderswakeup != 0) {
|
|
fdp->fd_holdleaderswakeup = 0;
|
|
wakeup(&fdp->fd_holdleaderscount);
|
|
}
|
|
FILEDESC_XUNLOCK(fdp);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Close a file descriptor.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct close_args {
|
|
int fd;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
sys_close(td, uap)
|
|
struct thread *td;
|
|
struct close_args *uap;
|
|
{
|
|
|
|
return (kern_close(td, uap->fd));
|
|
}
|
|
|
|
int
|
|
kern_close(td, fd)
|
|
struct thread *td;
|
|
int fd;
|
|
{
|
|
struct filedesc *fdp;
|
|
struct file *fp;
|
|
|
|
fdp = td->td_proc->p_fd;
|
|
|
|
AUDIT_SYSCLOSE(td, fd);
|
|
|
|
FILEDESC_XLOCK(fdp);
|
|
if ((fp = fget_locked(fdp, fd)) == NULL) {
|
|
FILEDESC_XUNLOCK(fdp);
|
|
return (EBADF);
|
|
}
|
|
fdfree(fdp, fd);
|
|
|
|
/* closefp() drops the FILEDESC lock for us. */
|
|
return (closefp(fdp, fd, fp, td, 1));
|
|
}
|
|
|
|
/*
|
|
* Close open file descriptors.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct closefrom_args {
|
|
int lowfd;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
sys_closefrom(struct thread *td, struct closefrom_args *uap)
|
|
{
|
|
struct filedesc *fdp;
|
|
int fd;
|
|
|
|
fdp = td->td_proc->p_fd;
|
|
AUDIT_ARG_FD(uap->lowfd);
|
|
|
|
/*
|
|
* Treat negative starting file descriptor values identical to
|
|
* closefrom(0) which closes all files.
|
|
*/
|
|
if (uap->lowfd < 0)
|
|
uap->lowfd = 0;
|
|
FILEDESC_SLOCK(fdp);
|
|
for (fd = uap->lowfd; fd <= fdp->fd_lastfile; fd++) {
|
|
if (fdp->fd_ofiles[fd].fde_file != NULL) {
|
|
FILEDESC_SUNLOCK(fdp);
|
|
(void)kern_close(td, fd);
|
|
FILEDESC_SLOCK(fdp);
|
|
}
|
|
}
|
|
FILEDESC_SUNLOCK(fdp);
|
|
return (0);
|
|
}
|
|
|
|
#if defined(COMPAT_43)
|
|
/*
|
|
* Return status information about a file descriptor.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct ofstat_args {
|
|
int fd;
|
|
struct ostat *sb;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
ofstat(struct thread *td, struct ofstat_args *uap)
|
|
{
|
|
struct ostat oub;
|
|
struct stat ub;
|
|
int error;
|
|
|
|
error = kern_fstat(td, uap->fd, &ub);
|
|
if (error == 0) {
|
|
cvtstat(&ub, &oub);
|
|
error = copyout(&oub, uap->sb, sizeof(oub));
|
|
}
|
|
return (error);
|
|
}
|
|
#endif /* COMPAT_43 */
|
|
|
|
/*
|
|
* Return status information about a file descriptor.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct fstat_args {
|
|
int fd;
|
|
struct stat *sb;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
sys_fstat(struct thread *td, struct fstat_args *uap)
|
|
{
|
|
struct stat ub;
|
|
int error;
|
|
|
|
error = kern_fstat(td, uap->fd, &ub);
|
|
if (error == 0)
|
|
error = copyout(&ub, uap->sb, sizeof(ub));
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
kern_fstat(struct thread *td, int fd, struct stat *sbp)
|
|
{
|
|
struct file *fp;
|
|
cap_rights_t rights;
|
|
int error;
|
|
|
|
AUDIT_ARG_FD(fd);
|
|
|
|
error = fget(td, fd, cap_rights_init(&rights, CAP_FSTAT), &fp);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
AUDIT_ARG_FILE(td->td_proc, fp);
|
|
|
|
error = fo_stat(fp, sbp, td->td_ucred, td);
|
|
fdrop(fp, td);
|
|
#ifdef KTRACE
|
|
if (error == 0 && KTRPOINT(td, KTR_STRUCT))
|
|
ktrstat(sbp);
|
|
#endif
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Return status information about a file descriptor.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct nfstat_args {
|
|
int fd;
|
|
struct nstat *sb;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
sys_nfstat(struct thread *td, struct nfstat_args *uap)
|
|
{
|
|
struct nstat nub;
|
|
struct stat ub;
|
|
int error;
|
|
|
|
error = kern_fstat(td, uap->fd, &ub);
|
|
if (error == 0) {
|
|
cvtnstat(&ub, &nub);
|
|
error = copyout(&nub, uap->sb, sizeof(nub));
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Return pathconf information about a file descriptor.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct fpathconf_args {
|
|
int fd;
|
|
int name;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
sys_fpathconf(struct thread *td, struct fpathconf_args *uap)
|
|
{
|
|
struct file *fp;
|
|
struct vnode *vp;
|
|
cap_rights_t rights;
|
|
int error;
|
|
|
|
error = fget(td, uap->fd, cap_rights_init(&rights, CAP_FPATHCONF), &fp);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
/* If asynchronous I/O is available, it works for all descriptors. */
|
|
if (uap->name == _PC_ASYNC_IO) {
|
|
td->td_retval[0] = async_io_version;
|
|
goto out;
|
|
}
|
|
vp = fp->f_vnode;
|
|
if (vp != NULL) {
|
|
vn_lock(vp, LK_SHARED | LK_RETRY);
|
|
error = VOP_PATHCONF(vp, uap->name, td->td_retval);
|
|
VOP_UNLOCK(vp, 0);
|
|
} else if (fp->f_type == DTYPE_PIPE || fp->f_type == DTYPE_SOCKET) {
|
|
if (uap->name != _PC_PIPE_BUF) {
|
|
error = EINVAL;
|
|
} else {
|
|
td->td_retval[0] = PIPE_BUF;
|
|
error = 0;
|
|
}
|
|
} else {
|
|
error = EOPNOTSUPP;
|
|
}
|
|
out:
|
|
fdrop(fp, td);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Initialize filecaps structure.
|
|
*/
|
|
void
|
|
filecaps_init(struct filecaps *fcaps)
|
|
{
|
|
|
|
bzero(fcaps, sizeof(*fcaps));
|
|
fcaps->fc_nioctls = -1;
|
|
}
|
|
|
|
/*
|
|
* Copy filecaps structure allocating memory for ioctls array if needed.
|
|
*/
|
|
void
|
|
filecaps_copy(const struct filecaps *src, struct filecaps *dst)
|
|
{
|
|
size_t size;
|
|
|
|
*dst = *src;
|
|
if (src->fc_ioctls != NULL) {
|
|
KASSERT(src->fc_nioctls > 0,
|
|
("fc_ioctls != NULL, but fc_nioctls=%hd", src->fc_nioctls));
|
|
|
|
size = sizeof(src->fc_ioctls[0]) * src->fc_nioctls;
|
|
dst->fc_ioctls = malloc(size, M_FILECAPS, M_WAITOK);
|
|
bcopy(src->fc_ioctls, dst->fc_ioctls, size);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Move filecaps structure to the new place and clear the old place.
|
|
*/
|
|
void
|
|
filecaps_move(struct filecaps *src, struct filecaps *dst)
|
|
{
|
|
|
|
*dst = *src;
|
|
bzero(src, sizeof(*src));
|
|
}
|
|
|
|
/*
|
|
* Fill the given filecaps structure with full rights.
|
|
*/
|
|
static void
|
|
filecaps_fill(struct filecaps *fcaps)
|
|
{
|
|
|
|
CAP_ALL(&fcaps->fc_rights);
|
|
fcaps->fc_ioctls = NULL;
|
|
fcaps->fc_nioctls = -1;
|
|
fcaps->fc_fcntls = CAP_FCNTL_ALL;
|
|
}
|
|
|
|
/*
|
|
* Free memory allocated within filecaps structure.
|
|
*/
|
|
void
|
|
filecaps_free(struct filecaps *fcaps)
|
|
{
|
|
|
|
free(fcaps->fc_ioctls, M_FILECAPS);
|
|
bzero(fcaps, sizeof(*fcaps));
|
|
}
|
|
|
|
/*
|
|
* Validate the given filecaps structure.
|
|
*/
|
|
static void
|
|
filecaps_validate(const struct filecaps *fcaps, const char *func)
|
|
{
|
|
|
|
KASSERT(cap_rights_is_valid(&fcaps->fc_rights),
|
|
("%s: invalid rights", func));
|
|
KASSERT((fcaps->fc_fcntls & ~CAP_FCNTL_ALL) == 0,
|
|
("%s: invalid fcntls", func));
|
|
KASSERT(fcaps->fc_fcntls == 0 ||
|
|
cap_rights_is_set(&fcaps->fc_rights, CAP_FCNTL),
|
|
("%s: fcntls without CAP_FCNTL", func));
|
|
KASSERT(fcaps->fc_ioctls != NULL ? fcaps->fc_nioctls > 0 :
|
|
(fcaps->fc_nioctls == -1 || fcaps->fc_nioctls == 0),
|
|
("%s: invalid ioctls", func));
|
|
KASSERT(fcaps->fc_nioctls == 0 ||
|
|
cap_rights_is_set(&fcaps->fc_rights, CAP_IOCTL),
|
|
("%s: ioctls without CAP_IOCTL", func));
|
|
}
|
|
|
|
static void
|
|
fdgrowtable_exp(struct filedesc *fdp, int nfd)
|
|
{
|
|
int nfd1;
|
|
|
|
FILEDESC_XLOCK_ASSERT(fdp);
|
|
|
|
nfd1 = fdp->fd_nfiles * 2;
|
|
if (nfd1 < nfd)
|
|
nfd1 = nfd;
|
|
fdgrowtable(fdp, nfd1);
|
|
}
|
|
|
|
/*
|
|
* Grow the file table to accomodate (at least) nfd descriptors.
|
|
*/
|
|
static void
|
|
fdgrowtable(struct filedesc *fdp, int nfd)
|
|
{
|
|
struct filedesc0 *fdp0;
|
|
struct freetable *ft;
|
|
struct fdescenttbl *ntable;
|
|
struct fdescenttbl *otable;
|
|
int nnfiles, onfiles;
|
|
NDSLOTTYPE *nmap, *omap;
|
|
|
|
/*
|
|
* If lastfile is -1 this struct filedesc was just allocated and we are
|
|
* growing it to accomodate for the one we are going to copy from. There
|
|
* is no need to have a lock on this one as it's not visible to anyone.
|
|
*/
|
|
if (fdp->fd_lastfile != -1)
|
|
FILEDESC_XLOCK_ASSERT(fdp);
|
|
|
|
KASSERT(fdp->fd_nfiles > 0, ("zero-length file table"));
|
|
|
|
/* save old values */
|
|
onfiles = fdp->fd_nfiles;
|
|
otable = fdp->fd_files;
|
|
omap = fdp->fd_map;
|
|
|
|
/* compute the size of the new table */
|
|
nnfiles = NDSLOTS(nfd) * NDENTRIES; /* round up */
|
|
if (nnfiles <= onfiles)
|
|
/* the table is already large enough */
|
|
return;
|
|
|
|
/*
|
|
* Allocate a new table. We need enough space for the number of
|
|
* entries, file entries themselves and the struct freetable we will use
|
|
* when we decommission the table and place it on the freelist.
|
|
* We place the struct freetable in the middle so we don't have
|
|
* to worry about padding.
|
|
*/
|
|
ntable = malloc(offsetof(struct fdescenttbl, fdt_ofiles) +
|
|
nnfiles * sizeof(ntable->fdt_ofiles[0]) +
|
|
sizeof(struct freetable),
|
|
M_FILEDESC, M_ZERO | M_WAITOK);
|
|
/* copy the old data */
|
|
ntable->fdt_nfiles = nnfiles;
|
|
memcpy(ntable->fdt_ofiles, otable->fdt_ofiles,
|
|
onfiles * sizeof(ntable->fdt_ofiles[0]));
|
|
|
|
/*
|
|
* Allocate a new map only if the old is not large enough. It will
|
|
* grow at a slower rate than the table as it can map more
|
|
* entries than the table can hold.
|
|
*/
|
|
if (NDSLOTS(nnfiles) > NDSLOTS(onfiles)) {
|
|
nmap = malloc(NDSLOTS(nnfiles) * NDSLOTSIZE, M_FILEDESC,
|
|
M_ZERO | M_WAITOK);
|
|
/* copy over the old data and update the pointer */
|
|
memcpy(nmap, omap, NDSLOTS(onfiles) * sizeof(*omap));
|
|
fdp->fd_map = nmap;
|
|
}
|
|
|
|
/*
|
|
* Make sure that ntable is correctly initialized before we replace
|
|
* fd_files poiner. Otherwise fget_unlocked() may see inconsistent
|
|
* data.
|
|
*/
|
|
atomic_store_rel_ptr((volatile void *)&fdp->fd_files, (uintptr_t)ntable);
|
|
|
|
/*
|
|
* Do not free the old file table, as some threads may still
|
|
* reference entries within it. Instead, place it on a freelist
|
|
* which will be processed when the struct filedesc is released.
|
|
*
|
|
* Note that if onfiles == NDFILE, we're dealing with the original
|
|
* static allocation contained within (struct filedesc0 *)fdp,
|
|
* which must not be freed.
|
|
*/
|
|
if (onfiles > NDFILE) {
|
|
ft = (struct freetable *)&otable->fdt_ofiles[onfiles];
|
|
fdp0 = (struct filedesc0 *)fdp;
|
|
ft->ft_table = otable;
|
|
SLIST_INSERT_HEAD(&fdp0->fd_free, ft, ft_next);
|
|
}
|
|
/*
|
|
* The map does not have the same possibility of threads still
|
|
* holding references to it. So always free it as long as it
|
|
* does not reference the original static allocation.
|
|
*/
|
|
if (NDSLOTS(onfiles) > NDSLOTS(NDFILE))
|
|
free(omap, M_FILEDESC);
|
|
}
|
|
|
|
/*
|
|
* Allocate a file descriptor for the process.
|
|
*/
|
|
int
|
|
fdalloc(struct thread *td, int minfd, int *result)
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
struct filedesc *fdp = p->p_fd;
|
|
int fd, maxfd, allocfd;
|
|
#ifdef RACCT
|
|
int error;
|
|
#endif
|
|
|
|
FILEDESC_XLOCK_ASSERT(fdp);
|
|
|
|
if (fdp->fd_freefile > minfd)
|
|
minfd = fdp->fd_freefile;
|
|
|
|
maxfd = getmaxfd(p);
|
|
|
|
/*
|
|
* Search the bitmap for a free descriptor starting at minfd.
|
|
* If none is found, grow the file table.
|
|
*/
|
|
fd = fd_first_free(fdp, minfd, fdp->fd_nfiles);
|
|
if (fd >= maxfd)
|
|
return (EMFILE);
|
|
if (fd >= fdp->fd_nfiles) {
|
|
allocfd = min(fd * 2, maxfd);
|
|
#ifdef RACCT
|
|
if (racct_enable) {
|
|
PROC_LOCK(p);
|
|
error = racct_set(p, RACCT_NOFILE, allocfd);
|
|
PROC_UNLOCK(p);
|
|
if (error != 0)
|
|
return (EMFILE);
|
|
}
|
|
#endif
|
|
/*
|
|
* fd is already equal to first free descriptor >= minfd, so
|
|
* we only need to grow the table and we are done.
|
|
*/
|
|
fdgrowtable_exp(fdp, allocfd);
|
|
}
|
|
|
|
/*
|
|
* Perform some sanity checks, then mark the file descriptor as
|
|
* used and return it to the caller.
|
|
*/
|
|
KASSERT(fd >= 0 && fd < min(maxfd, fdp->fd_nfiles),
|
|
("invalid descriptor %d", fd));
|
|
KASSERT(!fdisused(fdp, fd),
|
|
("fd_first_free() returned non-free descriptor"));
|
|
KASSERT(fdp->fd_ofiles[fd].fde_file == NULL,
|
|
("file descriptor isn't free"));
|
|
KASSERT(fdp->fd_ofiles[fd].fde_flags == 0, ("file flags are set"));
|
|
fdused(fdp, fd);
|
|
*result = fd;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Allocate n file descriptors for the process.
|
|
*/
|
|
int
|
|
fdallocn(struct thread *td, int minfd, int *fds, int n)
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
struct filedesc *fdp = p->p_fd;
|
|
int i;
|
|
|
|
FILEDESC_XLOCK_ASSERT(fdp);
|
|
|
|
for (i = 0; i < n; i++)
|
|
if (fdalloc(td, 0, &fds[i]) != 0)
|
|
break;
|
|
|
|
if (i < n) {
|
|
for (i--; i >= 0; i--)
|
|
fdunused(fdp, fds[i]);
|
|
return (EMFILE);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Create a new open file structure and allocate a file decriptor for the
|
|
* process that refers to it. We add one reference to the file for the
|
|
* descriptor table and one reference for resultfp. This is to prevent us
|
|
* being preempted and the entry in the descriptor table closed after we
|
|
* release the FILEDESC lock.
|
|
*/
|
|
int
|
|
falloc(struct thread *td, struct file **resultfp, int *resultfd, int flags)
|
|
{
|
|
struct file *fp;
|
|
int error, fd;
|
|
|
|
error = falloc_noinstall(td, &fp);
|
|
if (error)
|
|
return (error); /* no reference held on error */
|
|
|
|
error = finstall(td, fp, &fd, flags, NULL);
|
|
if (error) {
|
|
fdrop(fp, td); /* one reference (fp only) */
|
|
return (error);
|
|
}
|
|
|
|
if (resultfp != NULL)
|
|
*resultfp = fp; /* copy out result */
|
|
else
|
|
fdrop(fp, td); /* release local reference */
|
|
|
|
if (resultfd != NULL)
|
|
*resultfd = fd;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Create a new open file structure without allocating a file descriptor.
|
|
*/
|
|
int
|
|
falloc_noinstall(struct thread *td, struct file **resultfp)
|
|
{
|
|
struct file *fp;
|
|
int maxuserfiles = maxfiles - (maxfiles / 20);
|
|
static struct timeval lastfail;
|
|
static int curfail;
|
|
|
|
KASSERT(resultfp != NULL, ("%s: resultfp == NULL", __func__));
|
|
|
|
if ((openfiles >= maxuserfiles &&
|
|
priv_check(td, PRIV_MAXFILES) != 0) ||
|
|
openfiles >= maxfiles) {
|
|
if (ppsratecheck(&lastfail, &curfail, 1)) {
|
|
printf("kern.maxfiles limit exceeded by uid %i, "
|
|
"please see tuning(7).\n", td->td_ucred->cr_ruid);
|
|
}
|
|
return (ENFILE);
|
|
}
|
|
atomic_add_int(&openfiles, 1);
|
|
fp = uma_zalloc(file_zone, M_WAITOK | M_ZERO);
|
|
refcount_init(&fp->f_count, 1);
|
|
fp->f_cred = crhold(td->td_ucred);
|
|
fp->f_ops = &badfileops;
|
|
*resultfp = fp;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Install a file in a file descriptor table.
|
|
*/
|
|
int
|
|
finstall(struct thread *td, struct file *fp, int *fd, int flags,
|
|
struct filecaps *fcaps)
|
|
{
|
|
struct filedesc *fdp = td->td_proc->p_fd;
|
|
struct filedescent *fde;
|
|
int error;
|
|
|
|
KASSERT(fd != NULL, ("%s: fd == NULL", __func__));
|
|
KASSERT(fp != NULL, ("%s: fp == NULL", __func__));
|
|
if (fcaps != NULL)
|
|
filecaps_validate(fcaps, __func__);
|
|
|
|
FILEDESC_XLOCK(fdp);
|
|
if ((error = fdalloc(td, 0, fd))) {
|
|
FILEDESC_XUNLOCK(fdp);
|
|
return (error);
|
|
}
|
|
fhold(fp);
|
|
fde = &fdp->fd_ofiles[*fd];
|
|
#ifdef CAPABILITIES
|
|
seq_write_begin(&fde->fde_seq);
|
|
#endif
|
|
fde->fde_file = fp;
|
|
if ((flags & O_CLOEXEC) != 0)
|
|
fde->fde_flags |= UF_EXCLOSE;
|
|
if (fcaps != NULL)
|
|
filecaps_move(fcaps, &fde->fde_caps);
|
|
else
|
|
filecaps_fill(&fde->fde_caps);
|
|
#ifdef CAPABILITIES
|
|
seq_write_end(&fde->fde_seq);
|
|
#endif
|
|
FILEDESC_XUNLOCK(fdp);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Build a new filedesc structure from another.
|
|
* Copy the current, root, and jail root vnode references.
|
|
*
|
|
* If fdp is not NULL, return with it shared locked.
|
|
*/
|
|
struct filedesc *
|
|
fdinit(struct filedesc *fdp, bool prepfiles)
|
|
{
|
|
struct filedesc0 *newfdp0;
|
|
struct filedesc *newfdp;
|
|
|
|
newfdp0 = uma_zalloc(filedesc0_zone, M_WAITOK | M_ZERO);
|
|
newfdp = &newfdp0->fd_fd;
|
|
|
|
/* Create the file descriptor table. */
|
|
FILEDESC_LOCK_INIT(newfdp);
|
|
newfdp->fd_refcnt = 1;
|
|
newfdp->fd_holdcnt = 1;
|
|
newfdp->fd_cmask = CMASK;
|
|
newfdp->fd_map = newfdp0->fd_dmap;
|
|
newfdp->fd_lastfile = -1;
|
|
newfdp->fd_files = (struct fdescenttbl *)&newfdp0->fd_dfiles;
|
|
newfdp->fd_files->fdt_nfiles = NDFILE;
|
|
|
|
if (fdp == NULL)
|
|
return (newfdp);
|
|
|
|
if (prepfiles && fdp->fd_lastfile >= newfdp->fd_nfiles)
|
|
fdgrowtable(newfdp, fdp->fd_lastfile + 1);
|
|
|
|
FILEDESC_SLOCK(fdp);
|
|
newfdp->fd_cdir = fdp->fd_cdir;
|
|
if (newfdp->fd_cdir)
|
|
VREF(newfdp->fd_cdir);
|
|
newfdp->fd_rdir = fdp->fd_rdir;
|
|
if (newfdp->fd_rdir)
|
|
VREF(newfdp->fd_rdir);
|
|
newfdp->fd_jdir = fdp->fd_jdir;
|
|
if (newfdp->fd_jdir)
|
|
VREF(newfdp->fd_jdir);
|
|
|
|
if (!prepfiles) {
|
|
FILEDESC_SUNLOCK(fdp);
|
|
} else {
|
|
while (fdp->fd_lastfile >= newfdp->fd_nfiles) {
|
|
FILEDESC_SUNLOCK(fdp);
|
|
fdgrowtable(newfdp, fdp->fd_lastfile + 1);
|
|
FILEDESC_SLOCK(fdp);
|
|
}
|
|
}
|
|
|
|
return (newfdp);
|
|
}
|
|
|
|
static struct filedesc *
|
|
fdhold(struct proc *p)
|
|
{
|
|
struct filedesc *fdp;
|
|
|
|
mtx_lock(&fdesc_mtx);
|
|
fdp = p->p_fd;
|
|
if (fdp != NULL)
|
|
fdp->fd_holdcnt++;
|
|
mtx_unlock(&fdesc_mtx);
|
|
return (fdp);
|
|
}
|
|
|
|
static void
|
|
fddrop(struct filedesc *fdp)
|
|
{
|
|
int i;
|
|
|
|
if (fdp->fd_holdcnt > 1) {
|
|
mtx_lock(&fdesc_mtx);
|
|
i = --fdp->fd_holdcnt;
|
|
mtx_unlock(&fdesc_mtx);
|
|
if (i > 0)
|
|
return;
|
|
}
|
|
|
|
FILEDESC_LOCK_DESTROY(fdp);
|
|
uma_zfree(filedesc0_zone, fdp);
|
|
}
|
|
|
|
/*
|
|
* Share a filedesc structure.
|
|
*/
|
|
struct filedesc *
|
|
fdshare(struct filedesc *fdp)
|
|
{
|
|
|
|
FILEDESC_XLOCK(fdp);
|
|
fdp->fd_refcnt++;
|
|
FILEDESC_XUNLOCK(fdp);
|
|
return (fdp);
|
|
}
|
|
|
|
/*
|
|
* Unshare a filedesc structure, if necessary by making a copy
|
|
*/
|
|
void
|
|
fdunshare(struct thread *td)
|
|
{
|
|
struct filedesc *tmp;
|
|
struct proc *p = td->td_proc;
|
|
|
|
if (p->p_fd->fd_refcnt == 1)
|
|
return;
|
|
|
|
tmp = fdcopy(p->p_fd);
|
|
fdescfree(td);
|
|
p->p_fd = tmp;
|
|
}
|
|
|
|
/*
|
|
* Copy a filedesc structure. A NULL pointer in returns a NULL reference,
|
|
* this is to ease callers, not catch errors.
|
|
*/
|
|
struct filedesc *
|
|
fdcopy(struct filedesc *fdp)
|
|
{
|
|
struct filedesc *newfdp;
|
|
struct filedescent *nfde, *ofde;
|
|
int i;
|
|
|
|
MPASS(fdp != NULL);
|
|
|
|
newfdp = fdinit(fdp, true);
|
|
/* copy all passable descriptors (i.e. not kqueue) */
|
|
newfdp->fd_freefile = -1;
|
|
for (i = 0; i <= fdp->fd_lastfile; ++i) {
|
|
ofde = &fdp->fd_ofiles[i];
|
|
if (ofde->fde_file == NULL ||
|
|
(ofde->fde_file->f_ops->fo_flags & DFLAG_PASSABLE) == 0) {
|
|
if (newfdp->fd_freefile == -1)
|
|
newfdp->fd_freefile = i;
|
|
continue;
|
|
}
|
|
nfde = &newfdp->fd_ofiles[i];
|
|
*nfde = *ofde;
|
|
filecaps_copy(&ofde->fde_caps, &nfde->fde_caps);
|
|
fhold(nfde->fde_file);
|
|
fdused_init(newfdp, i);
|
|
newfdp->fd_lastfile = i;
|
|
}
|
|
if (newfdp->fd_freefile == -1)
|
|
newfdp->fd_freefile = i;
|
|
newfdp->fd_cmask = fdp->fd_cmask;
|
|
FILEDESC_SUNLOCK(fdp);
|
|
return (newfdp);
|
|
}
|
|
|
|
/*
|
|
* Clear POSIX style locks. This is only used when fdp looses a reference (i.e.
|
|
* one of processes using it exits) and the table used to be shared.
|
|
*/
|
|
static void
|
|
fdclearlocks(struct thread *td)
|
|
{
|
|
struct filedesc *fdp;
|
|
struct filedesc_to_leader *fdtol;
|
|
struct flock lf;
|
|
struct file *fp;
|
|
struct proc *p;
|
|
struct vnode *vp;
|
|
int i;
|
|
|
|
p = td->td_proc;
|
|
fdp = p->p_fd;
|
|
fdtol = p->p_fdtol;
|
|
MPASS(fdtol != NULL);
|
|
|
|
FILEDESC_XLOCK(fdp);
|
|
KASSERT(fdtol->fdl_refcount > 0,
|
|
("filedesc_to_refcount botch: fdl_refcount=%d",
|
|
fdtol->fdl_refcount));
|
|
if (fdtol->fdl_refcount == 1 &&
|
|
(p->p_leader->p_flag & P_ADVLOCK) != 0) {
|
|
for (i = 0; i <= fdp->fd_lastfile; i++) {
|
|
fp = fdp->fd_ofiles[i].fde_file;
|
|
if (fp == NULL || fp->f_type != DTYPE_VNODE)
|
|
continue;
|
|
fhold(fp);
|
|
FILEDESC_XUNLOCK(fdp);
|
|
lf.l_whence = SEEK_SET;
|
|
lf.l_start = 0;
|
|
lf.l_len = 0;
|
|
lf.l_type = F_UNLCK;
|
|
vp = fp->f_vnode;
|
|
(void) VOP_ADVLOCK(vp,
|
|
(caddr_t)p->p_leader, F_UNLCK,
|
|
&lf, F_POSIX);
|
|
FILEDESC_XLOCK(fdp);
|
|
fdrop(fp, td);
|
|
}
|
|
}
|
|
retry:
|
|
if (fdtol->fdl_refcount == 1) {
|
|
if (fdp->fd_holdleaderscount > 0 &&
|
|
(p->p_leader->p_flag & P_ADVLOCK) != 0) {
|
|
/*
|
|
* close() or do_dup() has cleared a reference
|
|
* in a shared file descriptor table.
|
|
*/
|
|
fdp->fd_holdleaderswakeup = 1;
|
|
sx_sleep(&fdp->fd_holdleaderscount,
|
|
FILEDESC_LOCK(fdp), PLOCK, "fdlhold", 0);
|
|
goto retry;
|
|
}
|
|
if (fdtol->fdl_holdcount > 0) {
|
|
/*
|
|
* Ensure that fdtol->fdl_leader remains
|
|
* valid in closef().
|
|
*/
|
|
fdtol->fdl_wakeup = 1;
|
|
sx_sleep(fdtol, FILEDESC_LOCK(fdp), PLOCK,
|
|
"fdlhold", 0);
|
|
goto retry;
|
|
}
|
|
}
|
|
fdtol->fdl_refcount--;
|
|
if (fdtol->fdl_refcount == 0 &&
|
|
fdtol->fdl_holdcount == 0) {
|
|
fdtol->fdl_next->fdl_prev = fdtol->fdl_prev;
|
|
fdtol->fdl_prev->fdl_next = fdtol->fdl_next;
|
|
} else
|
|
fdtol = NULL;
|
|
p->p_fdtol = NULL;
|
|
FILEDESC_XUNLOCK(fdp);
|
|
if (fdtol != NULL)
|
|
free(fdtol, M_FILEDESC_TO_LEADER);
|
|
}
|
|
|
|
/*
|
|
* Release a filedesc structure.
|
|
*/
|
|
void
|
|
fdescfree(struct thread *td)
|
|
{
|
|
struct filedesc0 *fdp0;
|
|
struct filedesc *fdp;
|
|
struct freetable *ft, *tft;
|
|
struct filedescent *fde;
|
|
struct file *fp;
|
|
struct vnode *cdir, *jdir, *rdir;
|
|
int i;
|
|
|
|
fdp = td->td_proc->p_fd;
|
|
MPASS(fdp != NULL);
|
|
|
|
#ifdef RACCT
|
|
if (racct_enable) {
|
|
PROC_LOCK(td->td_proc);
|
|
racct_set(td->td_proc, RACCT_NOFILE, 0);
|
|
PROC_UNLOCK(td->td_proc);
|
|
}
|
|
#endif
|
|
|
|
if (td->td_proc->p_fdtol != NULL)
|
|
fdclearlocks(td);
|
|
|
|
mtx_lock(&fdesc_mtx);
|
|
td->td_proc->p_fd = NULL;
|
|
mtx_unlock(&fdesc_mtx);
|
|
|
|
FILEDESC_XLOCK(fdp);
|
|
i = --fdp->fd_refcnt;
|
|
if (i > 0) {
|
|
FILEDESC_XUNLOCK(fdp);
|
|
return;
|
|
}
|
|
|
|
cdir = fdp->fd_cdir;
|
|
fdp->fd_cdir = NULL;
|
|
rdir = fdp->fd_rdir;
|
|
fdp->fd_rdir = NULL;
|
|
jdir = fdp->fd_jdir;
|
|
fdp->fd_jdir = NULL;
|
|
FILEDESC_XUNLOCK(fdp);
|
|
|
|
for (i = 0; i <= fdp->fd_lastfile; i++) {
|
|
fde = &fdp->fd_ofiles[i];
|
|
fp = fde->fde_file;
|
|
if (fp != NULL) {
|
|
fdefree_last(fde);
|
|
(void) closef(fp, td);
|
|
}
|
|
}
|
|
|
|
if (NDSLOTS(fdp->fd_nfiles) > NDSLOTS(NDFILE))
|
|
free(fdp->fd_map, M_FILEDESC);
|
|
if (fdp->fd_nfiles > NDFILE)
|
|
free(fdp->fd_files, M_FILEDESC);
|
|
|
|
fdp0 = (struct filedesc0 *)fdp;
|
|
SLIST_FOREACH_SAFE(ft, &fdp0->fd_free, ft_next, tft)
|
|
free(ft->ft_table, M_FILEDESC);
|
|
|
|
if (cdir != NULL)
|
|
vrele(cdir);
|
|
if (rdir != NULL)
|
|
vrele(rdir);
|
|
if (jdir != NULL)
|
|
vrele(jdir);
|
|
|
|
fddrop(fdp);
|
|
}
|
|
|
|
/*
|
|
* For setugid programs, we don't want to people to use that setugidness
|
|
* to generate error messages which write to a file which otherwise would
|
|
* otherwise be off-limits to the process. We check for filesystems where
|
|
* the vnode can change out from under us after execve (like [lin]procfs).
|
|
*
|
|
* Since fdsetugidsafety calls this only for fd 0, 1 and 2, this check is
|
|
* sufficient. We also don't check for setugidness since we know we are.
|
|
*/
|
|
static bool
|
|
is_unsafe(struct file *fp)
|
|
{
|
|
struct vnode *vp;
|
|
|
|
if (fp->f_type != DTYPE_VNODE)
|
|
return (false);
|
|
|
|
vp = fp->f_vnode;
|
|
return ((vp->v_vflag & VV_PROCDEP) != 0);
|
|
}
|
|
|
|
/*
|
|
* Make this setguid thing safe, if at all possible.
|
|
*/
|
|
void
|
|
fdsetugidsafety(struct thread *td)
|
|
{
|
|
struct filedesc *fdp;
|
|
struct file *fp;
|
|
int i;
|
|
|
|
fdp = td->td_proc->p_fd;
|
|
KASSERT(fdp->fd_refcnt == 1, ("the fdtable should not be shared"));
|
|
MPASS(fdp->fd_nfiles >= 3);
|
|
for (i = 0; i <= 2; i++) {
|
|
fp = fdp->fd_ofiles[i].fde_file;
|
|
if (fp != NULL && is_unsafe(fp)) {
|
|
FILEDESC_XLOCK(fdp);
|
|
knote_fdclose(td, i);
|
|
/*
|
|
* NULL-out descriptor prior to close to avoid
|
|
* a race while close blocks.
|
|
*/
|
|
fdfree(fdp, i);
|
|
FILEDESC_XUNLOCK(fdp);
|
|
(void) closef(fp, td);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If a specific file object occupies a specific file descriptor, close the
|
|
* file descriptor entry and drop a reference on the file object. This is a
|
|
* convenience function to handle a subsequent error in a function that calls
|
|
* falloc() that handles the race that another thread might have closed the
|
|
* file descriptor out from under the thread creating the file object.
|
|
*/
|
|
void
|
|
fdclose(struct thread *td, struct file *fp, int idx)
|
|
{
|
|
struct filedesc *fdp = td->td_proc->p_fd;
|
|
|
|
FILEDESC_XLOCK(fdp);
|
|
if (fdp->fd_ofiles[idx].fde_file == fp) {
|
|
fdfree(fdp, idx);
|
|
FILEDESC_XUNLOCK(fdp);
|
|
fdrop(fp, td);
|
|
} else
|
|
FILEDESC_XUNLOCK(fdp);
|
|
}
|
|
|
|
/*
|
|
* Close any files on exec?
|
|
*/
|
|
void
|
|
fdcloseexec(struct thread *td)
|
|
{
|
|
struct filedesc *fdp;
|
|
struct filedescent *fde;
|
|
struct file *fp;
|
|
int i;
|
|
|
|
fdp = td->td_proc->p_fd;
|
|
KASSERT(fdp->fd_refcnt == 1, ("the fdtable should not be shared"));
|
|
for (i = 0; i <= fdp->fd_lastfile; i++) {
|
|
fde = &fdp->fd_ofiles[i];
|
|
fp = fde->fde_file;
|
|
if (fp != NULL && (fp->f_type == DTYPE_MQUEUE ||
|
|
(fde->fde_flags & UF_EXCLOSE))) {
|
|
FILEDESC_XLOCK(fdp);
|
|
fdfree(fdp, i);
|
|
(void) closefp(fdp, i, fp, td, 0);
|
|
/* closefp() drops the FILEDESC lock. */
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* It is unsafe for set[ug]id processes to be started with file
|
|
* descriptors 0..2 closed, as these descriptors are given implicit
|
|
* significance in the Standard C library. fdcheckstd() will create a
|
|
* descriptor referencing /dev/null for each of stdin, stdout, and
|
|
* stderr that is not already open.
|
|
*/
|
|
int
|
|
fdcheckstd(struct thread *td)
|
|
{
|
|
struct filedesc *fdp;
|
|
register_t save;
|
|
int i, error, devnull;
|
|
|
|
fdp = td->td_proc->p_fd;
|
|
KASSERT(fdp->fd_refcnt == 1, ("the fdtable should not be shared"));
|
|
MPASS(fdp->fd_nfiles >= 3);
|
|
devnull = -1;
|
|
for (i = 0; i <= 2; i++) {
|
|
if (fdp->fd_ofiles[i].fde_file != NULL)
|
|
continue;
|
|
|
|
save = td->td_retval[0];
|
|
if (devnull != -1) {
|
|
error = do_dup(td, DUP_FIXED, devnull, i);
|
|
} else {
|
|
error = kern_openat(td, AT_FDCWD, "/dev/null",
|
|
UIO_SYSSPACE, O_RDWR, 0);
|
|
if (error == 0) {
|
|
devnull = td->td_retval[0];
|
|
KASSERT(devnull == i, ("we didn't get our fd"));
|
|
}
|
|
}
|
|
td->td_retval[0] = save;
|
|
if (error != 0)
|
|
return (error);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Internal form of close. Decrement reference count on file structure.
|
|
* Note: td may be NULL when closing a file that was being passed in a
|
|
* message.
|
|
*
|
|
* XXXRW: Giant is not required for the caller, but often will be held; this
|
|
* makes it moderately likely the Giant will be recursed in the VFS case.
|
|
*/
|
|
int
|
|
closef(struct file *fp, struct thread *td)
|
|
{
|
|
struct vnode *vp;
|
|
struct flock lf;
|
|
struct filedesc_to_leader *fdtol;
|
|
struct filedesc *fdp;
|
|
|
|
/*
|
|
* POSIX record locking dictates that any close releases ALL
|
|
* locks owned by this process. This is handled by setting
|
|
* a flag in the unlock to free ONLY locks obeying POSIX
|
|
* semantics, and not to free BSD-style file locks.
|
|
* If the descriptor was in a message, POSIX-style locks
|
|
* aren't passed with the descriptor, and the thread pointer
|
|
* will be NULL. Callers should be careful only to pass a
|
|
* NULL thread pointer when there really is no owning
|
|
* context that might have locks, or the locks will be
|
|
* leaked.
|
|
*/
|
|
if (fp->f_type == DTYPE_VNODE && td != NULL) {
|
|
vp = fp->f_vnode;
|
|
if ((td->td_proc->p_leader->p_flag & P_ADVLOCK) != 0) {
|
|
lf.l_whence = SEEK_SET;
|
|
lf.l_start = 0;
|
|
lf.l_len = 0;
|
|
lf.l_type = F_UNLCK;
|
|
(void) VOP_ADVLOCK(vp, (caddr_t)td->td_proc->p_leader,
|
|
F_UNLCK, &lf, F_POSIX);
|
|
}
|
|
fdtol = td->td_proc->p_fdtol;
|
|
if (fdtol != NULL) {
|
|
/*
|
|
* Handle special case where file descriptor table is
|
|
* shared between multiple process leaders.
|
|
*/
|
|
fdp = td->td_proc->p_fd;
|
|
FILEDESC_XLOCK(fdp);
|
|
for (fdtol = fdtol->fdl_next;
|
|
fdtol != td->td_proc->p_fdtol;
|
|
fdtol = fdtol->fdl_next) {
|
|
if ((fdtol->fdl_leader->p_flag &
|
|
P_ADVLOCK) == 0)
|
|
continue;
|
|
fdtol->fdl_holdcount++;
|
|
FILEDESC_XUNLOCK(fdp);
|
|
lf.l_whence = SEEK_SET;
|
|
lf.l_start = 0;
|
|
lf.l_len = 0;
|
|
lf.l_type = F_UNLCK;
|
|
vp = fp->f_vnode;
|
|
(void) VOP_ADVLOCK(vp,
|
|
(caddr_t)fdtol->fdl_leader, F_UNLCK, &lf,
|
|
F_POSIX);
|
|
FILEDESC_XLOCK(fdp);
|
|
fdtol->fdl_holdcount--;
|
|
if (fdtol->fdl_holdcount == 0 &&
|
|
fdtol->fdl_wakeup != 0) {
|
|
fdtol->fdl_wakeup = 0;
|
|
wakeup(fdtol);
|
|
}
|
|
}
|
|
FILEDESC_XUNLOCK(fdp);
|
|
}
|
|
}
|
|
return (fdrop(fp, td));
|
|
}
|
|
|
|
/*
|
|
* Initialize the file pointer with the specified properties.
|
|
*
|
|
* The ops are set with release semantics to be certain that the flags, type,
|
|
* and data are visible when ops is. This is to prevent ops methods from being
|
|
* called with bad data.
|
|
*/
|
|
void
|
|
finit(struct file *fp, u_int flag, short type, void *data, struct fileops *ops)
|
|
{
|
|
fp->f_data = data;
|
|
fp->f_flag = flag;
|
|
fp->f_type = type;
|
|
atomic_store_rel_ptr((volatile uintptr_t *)&fp->f_ops, (uintptr_t)ops);
|
|
}
|
|
|
|
int
|
|
fget_unlocked(struct filedesc *fdp, int fd, cap_rights_t *needrightsp,
|
|
struct file **fpp, seq_t *seqp)
|
|
{
|
|
#ifdef CAPABILITIES
|
|
struct filedescent *fde;
|
|
#endif
|
|
struct fdescenttbl *fdt;
|
|
struct file *fp;
|
|
u_int count;
|
|
#ifdef CAPABILITIES
|
|
seq_t seq;
|
|
cap_rights_t haverights;
|
|
int error;
|
|
#endif
|
|
|
|
fdt = fdp->fd_files;
|
|
if ((u_int)fd >= fdt->fdt_nfiles)
|
|
return (EBADF);
|
|
/*
|
|
* Fetch the descriptor locklessly. We avoid fdrop() races by
|
|
* never raising a refcount above 0. To accomplish this we have
|
|
* to use a cmpset loop rather than an atomic_add. The descriptor
|
|
* must be re-verified once we acquire a reference to be certain
|
|
* that the identity is still correct and we did not lose a race
|
|
* due to preemption.
|
|
*/
|
|
for (;;) {
|
|
#ifdef CAPABILITIES
|
|
seq = seq_read(fd_seq(fdt, fd));
|
|
fde = &fdt->fdt_ofiles[fd];
|
|
haverights = *cap_rights_fde(fde);
|
|
fp = fde->fde_file;
|
|
if (!seq_consistent(fd_seq(fdt, fd), seq)) {
|
|
cpu_spinwait();
|
|
continue;
|
|
}
|
|
#else
|
|
fp = fdt->fdt_ofiles[fd].fde_file;
|
|
#endif
|
|
if (fp == NULL)
|
|
return (EBADF);
|
|
#ifdef CAPABILITIES
|
|
if (needrightsp != NULL) {
|
|
error = cap_check(&haverights, needrightsp);
|
|
if (error != 0)
|
|
return (error);
|
|
}
|
|
#endif
|
|
retry:
|
|
count = fp->f_count;
|
|
if (count == 0) {
|
|
/*
|
|
* Force a reload. Other thread could reallocate the
|
|
* table before this fd was closed, so it possible that
|
|
* there is a stale fp pointer in cached version.
|
|
*/
|
|
fdt = *(struct fdescenttbl * volatile *)&(fdp->fd_files);
|
|
continue;
|
|
}
|
|
/*
|
|
* Use an acquire barrier to force re-reading of fdt so it is
|
|
* refreshed for verification.
|
|
*/
|
|
if (atomic_cmpset_acq_int(&fp->f_count, count, count + 1) == 0)
|
|
goto retry;
|
|
fdt = fdp->fd_files;
|
|
#ifdef CAPABILITIES
|
|
if (seq_consistent_nomb(fd_seq(fdt, fd), seq))
|
|
#else
|
|
if (fp == fdt->fdt_ofiles[fd].fde_file)
|
|
#endif
|
|
break;
|
|
fdrop(fp, curthread);
|
|
}
|
|
*fpp = fp;
|
|
if (seqp != NULL) {
|
|
#ifdef CAPABILITIES
|
|
*seqp = seq;
|
|
#endif
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Extract the file pointer associated with the specified descriptor for the
|
|
* current user process.
|
|
*
|
|
* If the descriptor doesn't exist or doesn't match 'flags', EBADF is
|
|
* returned.
|
|
*
|
|
* File's rights will be checked against the capability rights mask.
|
|
*
|
|
* If an error occured the non-zero error is returned and *fpp is set to
|
|
* NULL. Otherwise *fpp is held and set and zero is returned. Caller is
|
|
* responsible for fdrop().
|
|
*/
|
|
static __inline int
|
|
_fget(struct thread *td, int fd, struct file **fpp, int flags,
|
|
cap_rights_t *needrightsp, seq_t *seqp)
|
|
{
|
|
struct filedesc *fdp;
|
|
struct file *fp;
|
|
cap_rights_t needrights;
|
|
int error;
|
|
|
|
*fpp = NULL;
|
|
fdp = td->td_proc->p_fd;
|
|
if (needrightsp != NULL)
|
|
needrights = *needrightsp;
|
|
else
|
|
cap_rights_init(&needrights);
|
|
error = fget_unlocked(fdp, fd, &needrights, &fp, seqp);
|
|
if (error != 0)
|
|
return (error);
|
|
if (fp->f_ops == &badfileops) {
|
|
fdrop(fp, td);
|
|
return (EBADF);
|
|
}
|
|
|
|
/*
|
|
* FREAD and FWRITE failure return EBADF as per POSIX.
|
|
*/
|
|
error = 0;
|
|
switch (flags) {
|
|
case FREAD:
|
|
case FWRITE:
|
|
if ((fp->f_flag & flags) == 0)
|
|
error = EBADF;
|
|
break;
|
|
case FEXEC:
|
|
if ((fp->f_flag & (FREAD | FEXEC)) == 0 ||
|
|
((fp->f_flag & FWRITE) != 0))
|
|
error = EBADF;
|
|
break;
|
|
case 0:
|
|
break;
|
|
default:
|
|
KASSERT(0, ("wrong flags"));
|
|
}
|
|
|
|
if (error != 0) {
|
|
fdrop(fp, td);
|
|
return (error);
|
|
}
|
|
|
|
*fpp = fp;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
fget(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp)
|
|
{
|
|
|
|
return (_fget(td, fd, fpp, 0, rightsp, NULL));
|
|
}
|
|
|
|
int
|
|
fget_mmap(struct thread *td, int fd, cap_rights_t *rightsp, u_char *maxprotp,
|
|
struct file **fpp)
|
|
{
|
|
int error;
|
|
#ifndef CAPABILITIES
|
|
error = _fget(td, fd, fpp, 0, rightsp, NULL);
|
|
if (maxprotp != NULL)
|
|
*maxprotp = VM_PROT_ALL;
|
|
#else
|
|
struct filedesc *fdp = td->td_proc->p_fd;
|
|
seq_t seq;
|
|
|
|
MPASS(cap_rights_is_set(rightsp, CAP_MMAP));
|
|
for (;;) {
|
|
error = _fget(td, fd, fpp, 0, rightsp, &seq);
|
|
if (error != 0)
|
|
return (error);
|
|
/*
|
|
* If requested, convert capability rights to access flags.
|
|
*/
|
|
if (maxprotp != NULL)
|
|
*maxprotp = cap_rights_to_vmprot(cap_rights(fdp, fd));
|
|
if (!fd_modified(fdp, fd, seq))
|
|
break;
|
|
fdrop(*fpp, td);
|
|
}
|
|
#endif
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
fget_read(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp)
|
|
{
|
|
|
|
return (_fget(td, fd, fpp, FREAD, rightsp, NULL));
|
|
}
|
|
|
|
int
|
|
fget_write(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp)
|
|
{
|
|
|
|
return (_fget(td, fd, fpp, FWRITE, rightsp, NULL));
|
|
}
|
|
|
|
int
|
|
fget_fcntl(struct thread *td, int fd, cap_rights_t *rightsp, int needfcntl,
|
|
struct file **fpp)
|
|
{
|
|
struct filedesc *fdp = td->td_proc->p_fd;
|
|
#ifndef CAPABILITIES
|
|
return (fget_unlocked(fdp, fd, rightsp, fpp, NULL));
|
|
#else
|
|
int error;
|
|
seq_t seq;
|
|
|
|
MPASS(cap_rights_is_set(rightsp, CAP_FCNTL));
|
|
for (;;) {
|
|
error = fget_unlocked(fdp, fd, rightsp, fpp, &seq);
|
|
if (error != 0)
|
|
return (error);
|
|
error = cap_fcntl_check(fdp, fd, needfcntl);
|
|
if (!fd_modified(fdp, fd, seq))
|
|
break;
|
|
fdrop(*fpp, td);
|
|
}
|
|
if (error != 0) {
|
|
fdrop(*fpp, td);
|
|
*fpp = NULL;
|
|
}
|
|
return (error);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Like fget() but loads the underlying vnode, or returns an error if the
|
|
* descriptor does not represent a vnode. Note that pipes use vnodes but
|
|
* never have VM objects. The returned vnode will be vref()'d.
|
|
*
|
|
* XXX: what about the unused flags ?
|
|
*/
|
|
static __inline int
|
|
_fgetvp(struct thread *td, int fd, int flags, cap_rights_t *needrightsp,
|
|
struct vnode **vpp)
|
|
{
|
|
struct file *fp;
|
|
int error;
|
|
|
|
*vpp = NULL;
|
|
error = _fget(td, fd, &fp, flags, needrightsp, NULL);
|
|
if (error != 0)
|
|
return (error);
|
|
if (fp->f_vnode == NULL) {
|
|
error = EINVAL;
|
|
} else {
|
|
*vpp = fp->f_vnode;
|
|
vref(*vpp);
|
|
}
|
|
fdrop(fp, td);
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
fgetvp(struct thread *td, int fd, cap_rights_t *rightsp, struct vnode **vpp)
|
|
{
|
|
|
|
return (_fgetvp(td, fd, 0, rightsp, vpp));
|
|
}
|
|
|
|
int
|
|
fgetvp_rights(struct thread *td, int fd, cap_rights_t *needrightsp,
|
|
struct filecaps *havecaps, struct vnode **vpp)
|
|
{
|
|
struct filedesc *fdp;
|
|
struct file *fp;
|
|
#ifdef CAPABILITIES
|
|
int error;
|
|
#endif
|
|
|
|
fdp = td->td_proc->p_fd;
|
|
fp = fget_locked(fdp, fd);
|
|
if (fp == NULL || fp->f_ops == &badfileops)
|
|
return (EBADF);
|
|
|
|
#ifdef CAPABILITIES
|
|
if (needrightsp != NULL) {
|
|
error = cap_check(cap_rights(fdp, fd), needrightsp);
|
|
if (error != 0)
|
|
return (error);
|
|
}
|
|
#endif
|
|
|
|
if (fp->f_vnode == NULL)
|
|
return (EINVAL);
|
|
|
|
*vpp = fp->f_vnode;
|
|
vref(*vpp);
|
|
filecaps_copy(&fdp->fd_ofiles[fd].fde_caps, havecaps);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
fgetvp_read(struct thread *td, int fd, cap_rights_t *rightsp, struct vnode **vpp)
|
|
{
|
|
|
|
return (_fgetvp(td, fd, FREAD, rightsp, vpp));
|
|
}
|
|
|
|
int
|
|
fgetvp_exec(struct thread *td, int fd, cap_rights_t *rightsp, struct vnode **vpp)
|
|
{
|
|
|
|
return (_fgetvp(td, fd, FEXEC, rightsp, vpp));
|
|
}
|
|
|
|
#ifdef notyet
|
|
int
|
|
fgetvp_write(struct thread *td, int fd, cap_rights_t *rightsp,
|
|
struct vnode **vpp)
|
|
{
|
|
|
|
return (_fgetvp(td, fd, FWRITE, rightsp, vpp));
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Like fget() but loads the underlying socket, or returns an error if the
|
|
* descriptor does not represent a socket.
|
|
*
|
|
* We bump the ref count on the returned socket. XXX Also obtain the SX lock
|
|
* in the future.
|
|
*
|
|
* Note: fgetsock() and fputsock() are deprecated, as consumers should rely
|
|
* on their file descriptor reference to prevent the socket from being free'd
|
|
* during use.
|
|
*/
|
|
int
|
|
fgetsock(struct thread *td, int fd, cap_rights_t *rightsp, struct socket **spp,
|
|
u_int *fflagp)
|
|
{
|
|
struct file *fp;
|
|
int error;
|
|
|
|
*spp = NULL;
|
|
if (fflagp != NULL)
|
|
*fflagp = 0;
|
|
if ((error = _fget(td, fd, &fp, 0, rightsp, NULL)) != 0)
|
|
return (error);
|
|
if (fp->f_type != DTYPE_SOCKET) {
|
|
error = ENOTSOCK;
|
|
} else {
|
|
*spp = fp->f_data;
|
|
if (fflagp)
|
|
*fflagp = fp->f_flag;
|
|
SOCK_LOCK(*spp);
|
|
soref(*spp);
|
|
SOCK_UNLOCK(*spp);
|
|
}
|
|
fdrop(fp, td);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Drop the reference count on the socket and XXX release the SX lock in the
|
|
* future. The last reference closes the socket.
|
|
*
|
|
* Note: fputsock() is deprecated, see comment for fgetsock().
|
|
*/
|
|
void
|
|
fputsock(struct socket *so)
|
|
{
|
|
|
|
ACCEPT_LOCK();
|
|
SOCK_LOCK(so);
|
|
CURVNET_SET(so->so_vnet);
|
|
sorele(so);
|
|
CURVNET_RESTORE();
|
|
}
|
|
|
|
/*
|
|
* Handle the last reference to a file being closed.
|
|
*/
|
|
int
|
|
_fdrop(struct file *fp, struct thread *td)
|
|
{
|
|
int error;
|
|
|
|
if (fp->f_count != 0)
|
|
panic("fdrop: count %d", fp->f_count);
|
|
error = fo_close(fp, td);
|
|
atomic_subtract_int(&openfiles, 1);
|
|
crfree(fp->f_cred);
|
|
free(fp->f_advice, M_FADVISE);
|
|
uma_zfree(file_zone, fp);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Apply an advisory lock on a file descriptor.
|
|
*
|
|
* Just attempt to get a record lock of the requested type on the entire file
|
|
* (l_whence = SEEK_SET, l_start = 0, l_len = 0).
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct flock_args {
|
|
int fd;
|
|
int how;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
sys_flock(struct thread *td, struct flock_args *uap)
|
|
{
|
|
struct file *fp;
|
|
struct vnode *vp;
|
|
struct flock lf;
|
|
cap_rights_t rights;
|
|
int error;
|
|
|
|
error = fget(td, uap->fd, cap_rights_init(&rights, CAP_FLOCK), &fp);
|
|
if (error != 0)
|
|
return (error);
|
|
if (fp->f_type != DTYPE_VNODE) {
|
|
fdrop(fp, td);
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
vp = fp->f_vnode;
|
|
lf.l_whence = SEEK_SET;
|
|
lf.l_start = 0;
|
|
lf.l_len = 0;
|
|
if (uap->how & LOCK_UN) {
|
|
lf.l_type = F_UNLCK;
|
|
atomic_clear_int(&fp->f_flag, FHASLOCK);
|
|
error = VOP_ADVLOCK(vp, (caddr_t)fp, F_UNLCK, &lf, F_FLOCK);
|
|
goto done2;
|
|
}
|
|
if (uap->how & LOCK_EX)
|
|
lf.l_type = F_WRLCK;
|
|
else if (uap->how & LOCK_SH)
|
|
lf.l_type = F_RDLCK;
|
|
else {
|
|
error = EBADF;
|
|
goto done2;
|
|
}
|
|
atomic_set_int(&fp->f_flag, FHASLOCK);
|
|
error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf,
|
|
(uap->how & LOCK_NB) ? F_FLOCK : F_FLOCK | F_WAIT);
|
|
done2:
|
|
fdrop(fp, td);
|
|
return (error);
|
|
}
|
|
/*
|
|
* Duplicate the specified descriptor to a free descriptor.
|
|
*/
|
|
int
|
|
dupfdopen(struct thread *td, struct filedesc *fdp, int dfd, int mode,
|
|
int openerror, int *indxp)
|
|
{
|
|
struct filedescent *newfde, *oldfde;
|
|
struct file *fp;
|
|
int error, indx;
|
|
|
|
KASSERT(openerror == ENODEV || openerror == ENXIO,
|
|
("unexpected error %d in %s", openerror, __func__));
|
|
|
|
/*
|
|
* If the to-be-dup'd fd number is greater than the allowed number
|
|
* of file descriptors, or the fd to be dup'd has already been
|
|
* closed, then reject.
|
|
*/
|
|
FILEDESC_XLOCK(fdp);
|
|
if ((fp = fget_locked(fdp, dfd)) == NULL) {
|
|
FILEDESC_XUNLOCK(fdp);
|
|
return (EBADF);
|
|
}
|
|
|
|
error = fdalloc(td, 0, &indx);
|
|
if (error != 0) {
|
|
FILEDESC_XUNLOCK(fdp);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* There are two cases of interest here.
|
|
*
|
|
* For ENODEV simply dup (dfd) to file descriptor (indx) and return.
|
|
*
|
|
* For ENXIO steal away the file structure from (dfd) and store it in
|
|
* (indx). (dfd) is effectively closed by this operation.
|
|
*/
|
|
switch (openerror) {
|
|
case ENODEV:
|
|
/*
|
|
* Check that the mode the file is being opened for is a
|
|
* subset of the mode of the existing descriptor.
|
|
*/
|
|
if (((mode & (FREAD|FWRITE)) | fp->f_flag) != fp->f_flag) {
|
|
fdunused(fdp, indx);
|
|
FILEDESC_XUNLOCK(fdp);
|
|
return (EACCES);
|
|
}
|
|
fhold(fp);
|
|
newfde = &fdp->fd_ofiles[indx];
|
|
oldfde = &fdp->fd_ofiles[dfd];
|
|
#ifdef CAPABILITIES
|
|
seq_write_begin(&newfde->fde_seq);
|
|
#endif
|
|
memcpy(newfde, oldfde, fde_change_size);
|
|
filecaps_copy(&oldfde->fde_caps, &newfde->fde_caps);
|
|
#ifdef CAPABILITIES
|
|
seq_write_end(&newfde->fde_seq);
|
|
#endif
|
|
break;
|
|
case ENXIO:
|
|
/*
|
|
* Steal away the file pointer from dfd and stuff it into indx.
|
|
*/
|
|
newfde = &fdp->fd_ofiles[indx];
|
|
oldfde = &fdp->fd_ofiles[dfd];
|
|
#ifdef CAPABILITIES
|
|
seq_write_begin(&newfde->fde_seq);
|
|
#endif
|
|
memcpy(newfde, oldfde, fde_change_size);
|
|
bzero(oldfde, fde_change_size);
|
|
fdunused(fdp, dfd);
|
|
#ifdef CAPABILITIES
|
|
seq_write_end(&newfde->fde_seq);
|
|
#endif
|
|
break;
|
|
}
|
|
FILEDESC_XUNLOCK(fdp);
|
|
*indxp = indx;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Scan all active processes and prisons to see if any of them have a current
|
|
* or root directory of `olddp'. If so, replace them with the new mount point.
|
|
*/
|
|
void
|
|
mountcheckdirs(struct vnode *olddp, struct vnode *newdp)
|
|
{
|
|
struct filedesc *fdp;
|
|
struct prison *pr;
|
|
struct proc *p;
|
|
int nrele;
|
|
|
|
if (vrefcnt(olddp) == 1)
|
|
return;
|
|
nrele = 0;
|
|
sx_slock(&allproc_lock);
|
|
FOREACH_PROC_IN_SYSTEM(p) {
|
|
fdp = fdhold(p);
|
|
if (fdp == NULL)
|
|
continue;
|
|
FILEDESC_XLOCK(fdp);
|
|
if (fdp->fd_cdir == olddp) {
|
|
vref(newdp);
|
|
fdp->fd_cdir = newdp;
|
|
nrele++;
|
|
}
|
|
if (fdp->fd_rdir == olddp) {
|
|
vref(newdp);
|
|
fdp->fd_rdir = newdp;
|
|
nrele++;
|
|
}
|
|
if (fdp->fd_jdir == olddp) {
|
|
vref(newdp);
|
|
fdp->fd_jdir = newdp;
|
|
nrele++;
|
|
}
|
|
FILEDESC_XUNLOCK(fdp);
|
|
fddrop(fdp);
|
|
}
|
|
sx_sunlock(&allproc_lock);
|
|
if (rootvnode == olddp) {
|
|
vref(newdp);
|
|
rootvnode = newdp;
|
|
nrele++;
|
|
}
|
|
mtx_lock(&prison0.pr_mtx);
|
|
if (prison0.pr_root == olddp) {
|
|
vref(newdp);
|
|
prison0.pr_root = newdp;
|
|
nrele++;
|
|
}
|
|
mtx_unlock(&prison0.pr_mtx);
|
|
sx_slock(&allprison_lock);
|
|
TAILQ_FOREACH(pr, &allprison, pr_list) {
|
|
mtx_lock(&pr->pr_mtx);
|
|
if (pr->pr_root == olddp) {
|
|
vref(newdp);
|
|
pr->pr_root = newdp;
|
|
nrele++;
|
|
}
|
|
mtx_unlock(&pr->pr_mtx);
|
|
}
|
|
sx_sunlock(&allprison_lock);
|
|
while (nrele--)
|
|
vrele(olddp);
|
|
}
|
|
|
|
struct filedesc_to_leader *
|
|
filedesc_to_leader_alloc(struct filedesc_to_leader *old, struct filedesc *fdp, struct proc *leader)
|
|
{
|
|
struct filedesc_to_leader *fdtol;
|
|
|
|
fdtol = malloc(sizeof(struct filedesc_to_leader),
|
|
M_FILEDESC_TO_LEADER,
|
|
M_WAITOK);
|
|
fdtol->fdl_refcount = 1;
|
|
fdtol->fdl_holdcount = 0;
|
|
fdtol->fdl_wakeup = 0;
|
|
fdtol->fdl_leader = leader;
|
|
if (old != NULL) {
|
|
FILEDESC_XLOCK(fdp);
|
|
fdtol->fdl_next = old->fdl_next;
|
|
fdtol->fdl_prev = old;
|
|
old->fdl_next = fdtol;
|
|
fdtol->fdl_next->fdl_prev = fdtol;
|
|
FILEDESC_XUNLOCK(fdp);
|
|
} else {
|
|
fdtol->fdl_next = fdtol;
|
|
fdtol->fdl_prev = fdtol;
|
|
}
|
|
return (fdtol);
|
|
}
|
|
|
|
/*
|
|
* Get file structures globally.
|
|
*/
|
|
static int
|
|
sysctl_kern_file(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct xfile xf;
|
|
struct filedesc *fdp;
|
|
struct file *fp;
|
|
struct proc *p;
|
|
int error, n;
|
|
|
|
error = sysctl_wire_old_buffer(req, 0);
|
|
if (error != 0)
|
|
return (error);
|
|
if (req->oldptr == NULL) {
|
|
n = 0;
|
|
sx_slock(&allproc_lock);
|
|
FOREACH_PROC_IN_SYSTEM(p) {
|
|
if (p->p_state == PRS_NEW)
|
|
continue;
|
|
fdp = fdhold(p);
|
|
if (fdp == NULL)
|
|
continue;
|
|
/* overestimates sparse tables. */
|
|
if (fdp->fd_lastfile > 0)
|
|
n += fdp->fd_lastfile;
|
|
fddrop(fdp);
|
|
}
|
|
sx_sunlock(&allproc_lock);
|
|
return (SYSCTL_OUT(req, 0, n * sizeof(xf)));
|
|
}
|
|
error = 0;
|
|
bzero(&xf, sizeof(xf));
|
|
xf.xf_size = sizeof(xf);
|
|
sx_slock(&allproc_lock);
|
|
FOREACH_PROC_IN_SYSTEM(p) {
|
|
PROC_LOCK(p);
|
|
if (p->p_state == PRS_NEW) {
|
|
PROC_UNLOCK(p);
|
|
continue;
|
|
}
|
|
if (p_cansee(req->td, p) != 0) {
|
|
PROC_UNLOCK(p);
|
|
continue;
|
|
}
|
|
xf.xf_pid = p->p_pid;
|
|
xf.xf_uid = p->p_ucred->cr_uid;
|
|
PROC_UNLOCK(p);
|
|
fdp = fdhold(p);
|
|
if (fdp == NULL)
|
|
continue;
|
|
FILEDESC_SLOCK(fdp);
|
|
for (n = 0; fdp->fd_refcnt > 0 && n <= fdp->fd_lastfile; ++n) {
|
|
if ((fp = fdp->fd_ofiles[n].fde_file) == NULL)
|
|
continue;
|
|
xf.xf_fd = n;
|
|
xf.xf_file = fp;
|
|
xf.xf_data = fp->f_data;
|
|
xf.xf_vnode = fp->f_vnode;
|
|
xf.xf_type = fp->f_type;
|
|
xf.xf_count = fp->f_count;
|
|
xf.xf_msgcount = 0;
|
|
xf.xf_offset = foffset_get(fp);
|
|
xf.xf_flag = fp->f_flag;
|
|
error = SYSCTL_OUT(req, &xf, sizeof(xf));
|
|
if (error)
|
|
break;
|
|
}
|
|
FILEDESC_SUNLOCK(fdp);
|
|
fddrop(fdp);
|
|
if (error)
|
|
break;
|
|
}
|
|
sx_sunlock(&allproc_lock);
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_kern, KERN_FILE, file, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE,
|
|
0, 0, sysctl_kern_file, "S,xfile", "Entire file table");
|
|
|
|
#ifdef KINFO_FILE_SIZE
|
|
CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE);
|
|
#endif
|
|
|
|
static int
|
|
xlate_fflags(int fflags)
|
|
{
|
|
static const struct {
|
|
int fflag;
|
|
int kf_fflag;
|
|
} fflags_table[] = {
|
|
{ FAPPEND, KF_FLAG_APPEND },
|
|
{ FASYNC, KF_FLAG_ASYNC },
|
|
{ FFSYNC, KF_FLAG_FSYNC },
|
|
{ FHASLOCK, KF_FLAG_HASLOCK },
|
|
{ FNONBLOCK, KF_FLAG_NONBLOCK },
|
|
{ FREAD, KF_FLAG_READ },
|
|
{ FWRITE, KF_FLAG_WRITE },
|
|
{ O_CREAT, KF_FLAG_CREAT },
|
|
{ O_DIRECT, KF_FLAG_DIRECT },
|
|
{ O_EXCL, KF_FLAG_EXCL },
|
|
{ O_EXEC, KF_FLAG_EXEC },
|
|
{ O_EXLOCK, KF_FLAG_EXLOCK },
|
|
{ O_NOFOLLOW, KF_FLAG_NOFOLLOW },
|
|
{ O_SHLOCK, KF_FLAG_SHLOCK },
|
|
{ O_TRUNC, KF_FLAG_TRUNC }
|
|
};
|
|
unsigned int i;
|
|
int kflags;
|
|
|
|
kflags = 0;
|
|
for (i = 0; i < nitems(fflags_table); i++)
|
|
if (fflags & fflags_table[i].fflag)
|
|
kflags |= fflags_table[i].kf_fflag;
|
|
return (kflags);
|
|
}
|
|
|
|
/* Trim unused data from kf_path by truncating the structure size. */
|
|
static void
|
|
pack_kinfo(struct kinfo_file *kif)
|
|
{
|
|
|
|
kif->kf_structsize = offsetof(struct kinfo_file, kf_path) +
|
|
strlen(kif->kf_path) + 1;
|
|
kif->kf_structsize = roundup(kif->kf_structsize, sizeof(uint64_t));
|
|
}
|
|
|
|
static void
|
|
export_file_to_kinfo(struct file *fp, int fd, cap_rights_t *rightsp,
|
|
struct kinfo_file *kif, struct filedesc *fdp)
|
|
{
|
|
int error;
|
|
|
|
bzero(kif, sizeof(*kif));
|
|
|
|
/* Set a default type to allow for empty fill_kinfo() methods. */
|
|
kif->kf_type = KF_TYPE_UNKNOWN;
|
|
kif->kf_flags = xlate_fflags(fp->f_flag);
|
|
if (rightsp != NULL)
|
|
kif->kf_cap_rights = *rightsp;
|
|
else
|
|
cap_rights_init(&kif->kf_cap_rights);
|
|
kif->kf_fd = fd;
|
|
kif->kf_ref_count = fp->f_count;
|
|
kif->kf_offset = foffset_get(fp);
|
|
|
|
/*
|
|
* This may drop the filedesc lock, so the 'fp' cannot be
|
|
* accessed after this call.
|
|
*/
|
|
error = fo_fill_kinfo(fp, kif, fdp);
|
|
if (error == 0)
|
|
kif->kf_status |= KF_ATTR_VALID;
|
|
pack_kinfo(kif);
|
|
}
|
|
|
|
static void
|
|
export_vnode_to_kinfo(struct vnode *vp, int fd, int fflags,
|
|
struct kinfo_file *kif)
|
|
{
|
|
int error;
|
|
|
|
bzero(kif, sizeof(*kif));
|
|
|
|
kif->kf_type = KF_TYPE_VNODE;
|
|
error = vn_fill_kinfo_vnode(vp, kif);
|
|
if (error == 0)
|
|
kif->kf_status |= KF_ATTR_VALID;
|
|
kif->kf_flags = xlate_fflags(fflags);
|
|
cap_rights_init(&kif->kf_cap_rights);
|
|
kif->kf_fd = fd;
|
|
kif->kf_ref_count = -1;
|
|
kif->kf_offset = -1;
|
|
pack_kinfo(kif);
|
|
vrele(vp);
|
|
}
|
|
|
|
struct export_fd_buf {
|
|
struct filedesc *fdp;
|
|
struct sbuf *sb;
|
|
ssize_t remainder;
|
|
struct kinfo_file kif;
|
|
};
|
|
|
|
static int
|
|
export_kinfo_to_sb(struct export_fd_buf *efbuf)
|
|
{
|
|
struct kinfo_file *kif;
|
|
|
|
kif = &efbuf->kif;
|
|
if (efbuf->remainder != -1) {
|
|
if (efbuf->remainder < kif->kf_structsize) {
|
|
/* Terminate export. */
|
|
efbuf->remainder = 0;
|
|
return (0);
|
|
}
|
|
efbuf->remainder -= kif->kf_structsize;
|
|
}
|
|
return (sbuf_bcat(efbuf->sb, kif, kif->kf_structsize) == 0 ? 0 : ENOMEM);
|
|
}
|
|
|
|
static int
|
|
export_file_to_sb(struct file *fp, int fd, cap_rights_t *rightsp,
|
|
struct export_fd_buf *efbuf)
|
|
{
|
|
int error;
|
|
|
|
if (efbuf->remainder == 0)
|
|
return (0);
|
|
export_file_to_kinfo(fp, fd, rightsp, &efbuf->kif, efbuf->fdp);
|
|
FILEDESC_SUNLOCK(efbuf->fdp);
|
|
error = export_kinfo_to_sb(efbuf);
|
|
FILEDESC_SLOCK(efbuf->fdp);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
export_vnode_to_sb(struct vnode *vp, int fd, int fflags,
|
|
struct export_fd_buf *efbuf)
|
|
{
|
|
int error;
|
|
|
|
if (efbuf->remainder == 0)
|
|
return (0);
|
|
if (efbuf->fdp != NULL)
|
|
FILEDESC_SUNLOCK(efbuf->fdp);
|
|
export_vnode_to_kinfo(vp, fd, fflags, &efbuf->kif);
|
|
error = export_kinfo_to_sb(efbuf);
|
|
if (efbuf->fdp != NULL)
|
|
FILEDESC_SLOCK(efbuf->fdp);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Store a process file descriptor information to sbuf.
|
|
*
|
|
* Takes a locked proc as argument, and returns with the proc unlocked.
|
|
*/
|
|
int
|
|
kern_proc_filedesc_out(struct proc *p, struct sbuf *sb, ssize_t maxlen)
|
|
{
|
|
struct file *fp;
|
|
struct filedesc *fdp;
|
|
struct export_fd_buf *efbuf;
|
|
struct vnode *cttyvp, *textvp, *tracevp;
|
|
int error, i;
|
|
cap_rights_t rights;
|
|
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
|
|
/* ktrace vnode */
|
|
tracevp = p->p_tracevp;
|
|
if (tracevp != NULL)
|
|
vref(tracevp);
|
|
/* text vnode */
|
|
textvp = p->p_textvp;
|
|
if (textvp != NULL)
|
|
vref(textvp);
|
|
/* Controlling tty. */
|
|
cttyvp = NULL;
|
|
if (p->p_pgrp != NULL && p->p_pgrp->pg_session != NULL) {
|
|
cttyvp = p->p_pgrp->pg_session->s_ttyvp;
|
|
if (cttyvp != NULL)
|
|
vref(cttyvp);
|
|
}
|
|
fdp = fdhold(p);
|
|
PROC_UNLOCK(p);
|
|
efbuf = malloc(sizeof(*efbuf), M_TEMP, M_WAITOK);
|
|
efbuf->fdp = NULL;
|
|
efbuf->sb = sb;
|
|
efbuf->remainder = maxlen;
|
|
if (tracevp != NULL)
|
|
export_vnode_to_sb(tracevp, KF_FD_TYPE_TRACE, FREAD | FWRITE,
|
|
efbuf);
|
|
if (textvp != NULL)
|
|
export_vnode_to_sb(textvp, KF_FD_TYPE_TEXT, FREAD, efbuf);
|
|
if (cttyvp != NULL)
|
|
export_vnode_to_sb(cttyvp, KF_FD_TYPE_CTTY, FREAD | FWRITE,
|
|
efbuf);
|
|
error = 0;
|
|
if (fdp == NULL)
|
|
goto fail;
|
|
efbuf->fdp = fdp;
|
|
FILEDESC_SLOCK(fdp);
|
|
/* working directory */
|
|
if (fdp->fd_cdir != NULL) {
|
|
vref(fdp->fd_cdir);
|
|
export_vnode_to_sb(fdp->fd_cdir, KF_FD_TYPE_CWD, FREAD, efbuf);
|
|
}
|
|
/* root directory */
|
|
if (fdp->fd_rdir != NULL) {
|
|
vref(fdp->fd_rdir);
|
|
export_vnode_to_sb(fdp->fd_rdir, KF_FD_TYPE_ROOT, FREAD, efbuf);
|
|
}
|
|
/* jail directory */
|
|
if (fdp->fd_jdir != NULL) {
|
|
vref(fdp->fd_jdir);
|
|
export_vnode_to_sb(fdp->fd_jdir, KF_FD_TYPE_JAIL, FREAD, efbuf);
|
|
}
|
|
for (i = 0; fdp->fd_refcnt > 0 && i <= fdp->fd_lastfile; i++) {
|
|
if ((fp = fdp->fd_ofiles[i].fde_file) == NULL)
|
|
continue;
|
|
#ifdef CAPABILITIES
|
|
rights = *cap_rights(fdp, i);
|
|
#else /* !CAPABILITIES */
|
|
cap_rights_init(&rights);
|
|
#endif
|
|
/*
|
|
* Create sysctl entry. It is OK to drop the filedesc
|
|
* lock inside of export_file_to_sb() as we will
|
|
* re-validate and re-evaluate its properties when the
|
|
* loop continues.
|
|
*/
|
|
error = export_file_to_sb(fp, i, &rights, efbuf);
|
|
if (error != 0 || efbuf->remainder == 0)
|
|
break;
|
|
}
|
|
FILEDESC_SUNLOCK(fdp);
|
|
fddrop(fdp);
|
|
fail:
|
|
free(efbuf, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
#define FILEDESC_SBUF_SIZE (sizeof(struct kinfo_file) * 5)
|
|
|
|
/*
|
|
* Get per-process file descriptors for use by procstat(1), et al.
|
|
*/
|
|
static int
|
|
sysctl_kern_proc_filedesc(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct sbuf sb;
|
|
struct proc *p;
|
|
ssize_t maxlen;
|
|
int error, error2, *name;
|
|
|
|
name = (int *)arg1;
|
|
|
|
sbuf_new_for_sysctl(&sb, NULL, FILEDESC_SBUF_SIZE, req);
|
|
sbuf_clear_flags(&sb, SBUF_INCLUDENUL);
|
|
error = pget((pid_t)name[0], PGET_CANDEBUG | PGET_NOTWEXIT, &p);
|
|
if (error != 0) {
|
|
sbuf_delete(&sb);
|
|
return (error);
|
|
}
|
|
maxlen = req->oldptr != NULL ? req->oldlen : -1;
|
|
error = kern_proc_filedesc_out(p, &sb, maxlen);
|
|
error2 = sbuf_finish(&sb);
|
|
sbuf_delete(&sb);
|
|
return (error != 0 ? error : error2);
|
|
}
|
|
|
|
#ifdef KINFO_OFILE_SIZE
|
|
CTASSERT(sizeof(struct kinfo_ofile) == KINFO_OFILE_SIZE);
|
|
#endif
|
|
|
|
#ifdef COMPAT_FREEBSD7
|
|
static void
|
|
kinfo_to_okinfo(struct kinfo_file *kif, struct kinfo_ofile *okif)
|
|
{
|
|
|
|
okif->kf_structsize = sizeof(*okif);
|
|
okif->kf_type = kif->kf_type;
|
|
okif->kf_fd = kif->kf_fd;
|
|
okif->kf_ref_count = kif->kf_ref_count;
|
|
okif->kf_flags = kif->kf_flags & (KF_FLAG_READ | KF_FLAG_WRITE |
|
|
KF_FLAG_APPEND | KF_FLAG_ASYNC | KF_FLAG_FSYNC | KF_FLAG_NONBLOCK |
|
|
KF_FLAG_DIRECT | KF_FLAG_HASLOCK);
|
|
okif->kf_offset = kif->kf_offset;
|
|
okif->kf_vnode_type = kif->kf_vnode_type;
|
|
okif->kf_sock_domain = kif->kf_sock_domain;
|
|
okif->kf_sock_type = kif->kf_sock_type;
|
|
okif->kf_sock_protocol = kif->kf_sock_protocol;
|
|
strlcpy(okif->kf_path, kif->kf_path, sizeof(okif->kf_path));
|
|
okif->kf_sa_local = kif->kf_sa_local;
|
|
okif->kf_sa_peer = kif->kf_sa_peer;
|
|
}
|
|
|
|
static int
|
|
export_vnode_for_osysctl(struct vnode *vp, int type, struct kinfo_file *kif,
|
|
struct kinfo_ofile *okif, struct filedesc *fdp, struct sysctl_req *req)
|
|
{
|
|
int error;
|
|
|
|
vref(vp);
|
|
FILEDESC_SUNLOCK(fdp);
|
|
export_vnode_to_kinfo(vp, type, 0, kif);
|
|
kinfo_to_okinfo(kif, okif);
|
|
error = SYSCTL_OUT(req, okif, sizeof(*okif));
|
|
FILEDESC_SLOCK(fdp);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Get per-process file descriptors for use by procstat(1), et al.
|
|
*/
|
|
static int
|
|
sysctl_kern_proc_ofiledesc(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct kinfo_ofile *okif;
|
|
struct kinfo_file *kif;
|
|
struct filedesc *fdp;
|
|
int error, i, *name;
|
|
struct file *fp;
|
|
struct proc *p;
|
|
|
|
name = (int *)arg1;
|
|
error = pget((pid_t)name[0], PGET_CANDEBUG | PGET_NOTWEXIT, &p);
|
|
if (error != 0)
|
|
return (error);
|
|
fdp = fdhold(p);
|
|
PROC_UNLOCK(p);
|
|
if (fdp == NULL)
|
|
return (ENOENT);
|
|
kif = malloc(sizeof(*kif), M_TEMP, M_WAITOK);
|
|
okif = malloc(sizeof(*okif), M_TEMP, M_WAITOK);
|
|
FILEDESC_SLOCK(fdp);
|
|
if (fdp->fd_cdir != NULL)
|
|
export_vnode_for_osysctl(fdp->fd_cdir, KF_FD_TYPE_CWD, kif,
|
|
okif, fdp, req);
|
|
if (fdp->fd_rdir != NULL)
|
|
export_vnode_for_osysctl(fdp->fd_rdir, KF_FD_TYPE_ROOT, kif,
|
|
okif, fdp, req);
|
|
if (fdp->fd_jdir != NULL)
|
|
export_vnode_for_osysctl(fdp->fd_jdir, KF_FD_TYPE_JAIL, kif,
|
|
okif, fdp, req);
|
|
for (i = 0; fdp->fd_refcnt > 0 && i <= fdp->fd_lastfile; i++) {
|
|
if ((fp = fdp->fd_ofiles[i].fde_file) == NULL)
|
|
continue;
|
|
export_file_to_kinfo(fp, i, NULL, kif, fdp);
|
|
FILEDESC_SUNLOCK(fdp);
|
|
kinfo_to_okinfo(kif, okif);
|
|
error = SYSCTL_OUT(req, okif, sizeof(*okif));
|
|
FILEDESC_SLOCK(fdp);
|
|
if (error)
|
|
break;
|
|
}
|
|
FILEDESC_SUNLOCK(fdp);
|
|
fddrop(fdp);
|
|
free(kif, M_TEMP);
|
|
free(okif, M_TEMP);
|
|
return (0);
|
|
}
|
|
|
|
static SYSCTL_NODE(_kern_proc, KERN_PROC_OFILEDESC, ofiledesc,
|
|
CTLFLAG_RD|CTLFLAG_MPSAFE, sysctl_kern_proc_ofiledesc,
|
|
"Process ofiledesc entries");
|
|
#endif /* COMPAT_FREEBSD7 */
|
|
|
|
int
|
|
vntype_to_kinfo(int vtype)
|
|
{
|
|
struct {
|
|
int vtype;
|
|
int kf_vtype;
|
|
} vtypes_table[] = {
|
|
{ VBAD, KF_VTYPE_VBAD },
|
|
{ VBLK, KF_VTYPE_VBLK },
|
|
{ VCHR, KF_VTYPE_VCHR },
|
|
{ VDIR, KF_VTYPE_VDIR },
|
|
{ VFIFO, KF_VTYPE_VFIFO },
|
|
{ VLNK, KF_VTYPE_VLNK },
|
|
{ VNON, KF_VTYPE_VNON },
|
|
{ VREG, KF_VTYPE_VREG },
|
|
{ VSOCK, KF_VTYPE_VSOCK }
|
|
};
|
|
unsigned int i;
|
|
|
|
/*
|
|
* Perform vtype translation.
|
|
*/
|
|
for (i = 0; i < nitems(vtypes_table); i++)
|
|
if (vtypes_table[i].vtype == vtype)
|
|
return (vtypes_table[i].kf_vtype);
|
|
|
|
return (KF_VTYPE_UNKNOWN);
|
|
}
|
|
|
|
static SYSCTL_NODE(_kern_proc, KERN_PROC_FILEDESC, filedesc,
|
|
CTLFLAG_RD|CTLFLAG_MPSAFE, sysctl_kern_proc_filedesc,
|
|
"Process filedesc entries");
|
|
|
|
/*
|
|
* Store a process current working directory information to sbuf.
|
|
*
|
|
* Takes a locked proc as argument, and returns with the proc unlocked.
|
|
*/
|
|
int
|
|
kern_proc_cwd_out(struct proc *p, struct sbuf *sb, ssize_t maxlen)
|
|
{
|
|
struct filedesc *fdp;
|
|
struct export_fd_buf *efbuf;
|
|
int error;
|
|
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
|
|
fdp = fdhold(p);
|
|
PROC_UNLOCK(p);
|
|
if (fdp == NULL)
|
|
return (EINVAL);
|
|
|
|
efbuf = malloc(sizeof(*efbuf), M_TEMP, M_WAITOK);
|
|
efbuf->fdp = fdp;
|
|
efbuf->sb = sb;
|
|
efbuf->remainder = maxlen;
|
|
|
|
FILEDESC_SLOCK(fdp);
|
|
if (fdp->fd_cdir == NULL)
|
|
error = EINVAL;
|
|
else {
|
|
vref(fdp->fd_cdir);
|
|
error = export_vnode_to_sb(fdp->fd_cdir, KF_FD_TYPE_CWD,
|
|
FREAD, efbuf);
|
|
}
|
|
FILEDESC_SUNLOCK(fdp);
|
|
fddrop(fdp);
|
|
free(efbuf, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Get per-process current working directory.
|
|
*/
|
|
static int
|
|
sysctl_kern_proc_cwd(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct sbuf sb;
|
|
struct proc *p;
|
|
ssize_t maxlen;
|
|
int error, error2, *name;
|
|
|
|
name = (int *)arg1;
|
|
|
|
sbuf_new_for_sysctl(&sb, NULL, sizeof(struct kinfo_file), req);
|
|
sbuf_clear_flags(&sb, SBUF_INCLUDENUL);
|
|
error = pget((pid_t)name[0], PGET_CANDEBUG | PGET_NOTWEXIT, &p);
|
|
if (error != 0) {
|
|
sbuf_delete(&sb);
|
|
return (error);
|
|
}
|
|
maxlen = req->oldptr != NULL ? req->oldlen : -1;
|
|
error = kern_proc_cwd_out(p, &sb, maxlen);
|
|
error2 = sbuf_finish(&sb);
|
|
sbuf_delete(&sb);
|
|
return (error != 0 ? error : error2);
|
|
}
|
|
|
|
static SYSCTL_NODE(_kern_proc, KERN_PROC_CWD, cwd, CTLFLAG_RD|CTLFLAG_MPSAFE,
|
|
sysctl_kern_proc_cwd, "Process current working directory");
|
|
|
|
#ifdef DDB
|
|
/*
|
|
* For the purposes of debugging, generate a human-readable string for the
|
|
* file type.
|
|
*/
|
|
static const char *
|
|
file_type_to_name(short type)
|
|
{
|
|
|
|
switch (type) {
|
|
case 0:
|
|
return ("zero");
|
|
case DTYPE_VNODE:
|
|
return ("vnod");
|
|
case DTYPE_SOCKET:
|
|
return ("sock");
|
|
case DTYPE_PIPE:
|
|
return ("pipe");
|
|
case DTYPE_FIFO:
|
|
return ("fifo");
|
|
case DTYPE_KQUEUE:
|
|
return ("kque");
|
|
case DTYPE_CRYPTO:
|
|
return ("crpt");
|
|
case DTYPE_MQUEUE:
|
|
return ("mque");
|
|
case DTYPE_SHM:
|
|
return ("shm");
|
|
case DTYPE_SEM:
|
|
return ("ksem");
|
|
default:
|
|
return ("unkn");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* For the purposes of debugging, identify a process (if any, perhaps one of
|
|
* many) that references the passed file in its file descriptor array. Return
|
|
* NULL if none.
|
|
*/
|
|
static struct proc *
|
|
file_to_first_proc(struct file *fp)
|
|
{
|
|
struct filedesc *fdp;
|
|
struct proc *p;
|
|
int n;
|
|
|
|
FOREACH_PROC_IN_SYSTEM(p) {
|
|
if (p->p_state == PRS_NEW)
|
|
continue;
|
|
fdp = p->p_fd;
|
|
if (fdp == NULL)
|
|
continue;
|
|
for (n = 0; n <= fdp->fd_lastfile; n++) {
|
|
if (fp == fdp->fd_ofiles[n].fde_file)
|
|
return (p);
|
|
}
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
static void
|
|
db_print_file(struct file *fp, int header)
|
|
{
|
|
struct proc *p;
|
|
|
|
if (header)
|
|
db_printf("%8s %4s %8s %8s %4s %5s %6s %8s %5s %12s\n",
|
|
"File", "Type", "Data", "Flag", "GCFl", "Count",
|
|
"MCount", "Vnode", "FPID", "FCmd");
|
|
p = file_to_first_proc(fp);
|
|
db_printf("%8p %4s %8p %08x %04x %5d %6d %8p %5d %12s\n", fp,
|
|
file_type_to_name(fp->f_type), fp->f_data, fp->f_flag,
|
|
0, fp->f_count, 0, fp->f_vnode,
|
|
p != NULL ? p->p_pid : -1, p != NULL ? p->p_comm : "-");
|
|
}
|
|
|
|
DB_SHOW_COMMAND(file, db_show_file)
|
|
{
|
|
struct file *fp;
|
|
|
|
if (!have_addr) {
|
|
db_printf("usage: show file <addr>\n");
|
|
return;
|
|
}
|
|
fp = (struct file *)addr;
|
|
db_print_file(fp, 1);
|
|
}
|
|
|
|
DB_SHOW_COMMAND(files, db_show_files)
|
|
{
|
|
struct filedesc *fdp;
|
|
struct file *fp;
|
|
struct proc *p;
|
|
int header;
|
|
int n;
|
|
|
|
header = 1;
|
|
FOREACH_PROC_IN_SYSTEM(p) {
|
|
if (p->p_state == PRS_NEW)
|
|
continue;
|
|
if ((fdp = p->p_fd) == NULL)
|
|
continue;
|
|
for (n = 0; n <= fdp->fd_lastfile; ++n) {
|
|
if ((fp = fdp->fd_ofiles[n].fde_file) == NULL)
|
|
continue;
|
|
db_print_file(fp, header);
|
|
header = 0;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
SYSCTL_INT(_kern, KERN_MAXFILESPERPROC, maxfilesperproc, CTLFLAG_RW,
|
|
&maxfilesperproc, 0, "Maximum files allowed open per process");
|
|
|
|
SYSCTL_INT(_kern, KERN_MAXFILES, maxfiles, CTLFLAG_RW,
|
|
&maxfiles, 0, "Maximum number of files");
|
|
|
|
SYSCTL_INT(_kern, OID_AUTO, openfiles, CTLFLAG_RD,
|
|
__DEVOLATILE(int *, &openfiles), 0, "System-wide number of open files");
|
|
|
|
/* ARGSUSED*/
|
|
static void
|
|
filelistinit(void *dummy)
|
|
{
|
|
|
|
file_zone = uma_zcreate("Files", sizeof(struct file), NULL, NULL,
|
|
NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
|
|
filedesc0_zone = uma_zcreate("filedesc0", sizeof(struct filedesc0),
|
|
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
|
|
mtx_init(&sigio_lock, "sigio lock", NULL, MTX_DEF);
|
|
mtx_init(&fdesc_mtx, "fdesc", NULL, MTX_DEF);
|
|
}
|
|
SYSINIT(select, SI_SUB_LOCK, SI_ORDER_FIRST, filelistinit, NULL);
|
|
|
|
/*-------------------------------------------------------------------*/
|
|
|
|
static int
|
|
badfo_readwrite(struct file *fp, struct uio *uio, struct ucred *active_cred,
|
|
int flags, struct thread *td)
|
|
{
|
|
|
|
return (EBADF);
|
|
}
|
|
|
|
static int
|
|
badfo_truncate(struct file *fp, off_t length, struct ucred *active_cred,
|
|
struct thread *td)
|
|
{
|
|
|
|
return (EINVAL);
|
|
}
|
|
|
|
static int
|
|
badfo_ioctl(struct file *fp, u_long com, void *data, struct ucred *active_cred,
|
|
struct thread *td)
|
|
{
|
|
|
|
return (EBADF);
|
|
}
|
|
|
|
static int
|
|
badfo_poll(struct file *fp, int events, struct ucred *active_cred,
|
|
struct thread *td)
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
badfo_kqfilter(struct file *fp, struct knote *kn)
|
|
{
|
|
|
|
return (EBADF);
|
|
}
|
|
|
|
static int
|
|
badfo_stat(struct file *fp, struct stat *sb, struct ucred *active_cred,
|
|
struct thread *td)
|
|
{
|
|
|
|
return (EBADF);
|
|
}
|
|
|
|
static int
|
|
badfo_close(struct file *fp, struct thread *td)
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
badfo_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
|
|
struct thread *td)
|
|
{
|
|
|
|
return (EBADF);
|
|
}
|
|
|
|
static int
|
|
badfo_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
|
|
struct thread *td)
|
|
{
|
|
|
|
return (EBADF);
|
|
}
|
|
|
|
static int
|
|
badfo_sendfile(struct file *fp, int sockfd, struct uio *hdr_uio,
|
|
struct uio *trl_uio, off_t offset, size_t nbytes, off_t *sent, int flags,
|
|
int kflags, struct thread *td)
|
|
{
|
|
|
|
return (EBADF);
|
|
}
|
|
|
|
static int
|
|
badfo_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
struct fileops badfileops = {
|
|
.fo_read = badfo_readwrite,
|
|
.fo_write = badfo_readwrite,
|
|
.fo_truncate = badfo_truncate,
|
|
.fo_ioctl = badfo_ioctl,
|
|
.fo_poll = badfo_poll,
|
|
.fo_kqfilter = badfo_kqfilter,
|
|
.fo_stat = badfo_stat,
|
|
.fo_close = badfo_close,
|
|
.fo_chmod = badfo_chmod,
|
|
.fo_chown = badfo_chown,
|
|
.fo_sendfile = badfo_sendfile,
|
|
.fo_fill_kinfo = badfo_fill_kinfo,
|
|
};
|
|
|
|
int
|
|
invfo_rdwr(struct file *fp, struct uio *uio, struct ucred *active_cred,
|
|
int flags, struct thread *td)
|
|
{
|
|
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
invfo_truncate(struct file *fp, off_t length, struct ucred *active_cred,
|
|
struct thread *td)
|
|
{
|
|
|
|
return (EINVAL);
|
|
}
|
|
|
|
int
|
|
invfo_ioctl(struct file *fp, u_long com, void *data,
|
|
struct ucred *active_cred, struct thread *td)
|
|
{
|
|
|
|
return (ENOTTY);
|
|
}
|
|
|
|
int
|
|
invfo_poll(struct file *fp, int events, struct ucred *active_cred,
|
|
struct thread *td)
|
|
{
|
|
|
|
return (poll_no_poll(events));
|
|
}
|
|
|
|
int
|
|
invfo_kqfilter(struct file *fp, struct knote *kn)
|
|
{
|
|
|
|
return (EINVAL);
|
|
}
|
|
|
|
int
|
|
invfo_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
|
|
struct thread *td)
|
|
{
|
|
|
|
return (EINVAL);
|
|
}
|
|
|
|
int
|
|
invfo_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
|
|
struct thread *td)
|
|
{
|
|
|
|
return (EINVAL);
|
|
}
|
|
|
|
int
|
|
invfo_sendfile(struct file *fp, int sockfd, struct uio *hdr_uio,
|
|
struct uio *trl_uio, off_t offset, size_t nbytes, off_t *sent, int flags,
|
|
int kflags, struct thread *td)
|
|
{
|
|
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*-------------------------------------------------------------------*/
|
|
|
|
/*
|
|
* File Descriptor pseudo-device driver (/dev/fd/).
|
|
*
|
|
* Opening minor device N dup()s the file (if any) connected to file
|
|
* descriptor N belonging to the calling process. Note that this driver
|
|
* consists of only the ``open()'' routine, because all subsequent
|
|
* references to this file will be direct to the other driver.
|
|
*
|
|
* XXX: we could give this one a cloning event handler if necessary.
|
|
*/
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
fdopen(struct cdev *dev, int mode, int type, struct thread *td)
|
|
{
|
|
|
|
/*
|
|
* XXX Kludge: set curthread->td_dupfd to contain the value of the
|
|
* the file descriptor being sought for duplication. The error
|
|
* return ensures that the vnode for this device will be released
|
|
* by vn_open. Open will detect this special error and take the
|
|
* actions in dupfdopen below. Other callers of vn_open or VOP_OPEN
|
|
* will simply report the error.
|
|
*/
|
|
td->td_dupfd = dev2unit(dev);
|
|
return (ENODEV);
|
|
}
|
|
|
|
static struct cdevsw fildesc_cdevsw = {
|
|
.d_version = D_VERSION,
|
|
.d_open = fdopen,
|
|
.d_name = "FD",
|
|
};
|
|
|
|
static void
|
|
fildesc_drvinit(void *unused)
|
|
{
|
|
struct cdev *dev;
|
|
|
|
dev = make_dev_credf(MAKEDEV_ETERNAL, &fildesc_cdevsw, 0, NULL,
|
|
UID_ROOT, GID_WHEEL, 0666, "fd/0");
|
|
make_dev_alias(dev, "stdin");
|
|
dev = make_dev_credf(MAKEDEV_ETERNAL, &fildesc_cdevsw, 1, NULL,
|
|
UID_ROOT, GID_WHEEL, 0666, "fd/1");
|
|
make_dev_alias(dev, "stdout");
|
|
dev = make_dev_credf(MAKEDEV_ETERNAL, &fildesc_cdevsw, 2, NULL,
|
|
UID_ROOT, GID_WHEEL, 0666, "fd/2");
|
|
make_dev_alias(dev, "stderr");
|
|
}
|
|
|
|
SYSINIT(fildescdev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, fildesc_drvinit, NULL);
|