2ff47c5f18
vnode in question does not need to be held. All the data structures used during the name lookup are protected by the global name cache lock. Instead, the caller merely needs to ensure a reference is held on the vnode (such as vhold()) to keep it from being freed. In the case of procfs' <pid>/file entry, grab the process lock while we gain a new reference (via vhold()) on p_textvp to fully close races with execve(2). For the kern.proc.vmmap sysctl handler, use a shared vnode lock around the call to VOP_GETATTR() rather than an exclusive lock. MFC after: 1 month
207 lines
5.8 KiB
C
207 lines
5.8 KiB
C
/*-
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* Copyright (c) 2001 Dag-Erling Smørgrav
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* Copyright (c) 1993 Jan-Simon Pendry
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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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* @(#)procfs_vfsops.c 8.7 (Berkeley) 5/10/95
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/queue.h>
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#include <sys/exec.h>
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#include <sys/lock.h>
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#include <sys/kernel.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/proc.h>
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#include <sys/sbuf.h>
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#include <sys/sysproto.h>
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#include <sys/systm.h>
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#include <sys/vnode.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_param.h>
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#include <fs/pseudofs/pseudofs.h>
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#include <fs/procfs/procfs.h>
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/*
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* Filler function for proc/pid/self
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*/
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int
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procfs_doprocfile(PFS_FILL_ARGS)
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{
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char *fullpath = "unknown";
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char *freepath = NULL;
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struct vnode *textvp;
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PROC_LOCK(p);
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textvp = p->p_textvp;
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vhold(textvp);
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PROC_UNLOCK(p);
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vn_fullpath(td, textvp, &fullpath, &freepath);
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vdrop(textvp);
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sbuf_printf(sb, "%s", fullpath);
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if (freepath)
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free(freepath, M_TEMP);
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return (0);
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}
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/*
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* Filler function for proc/curproc
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*/
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int
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procfs_docurproc(PFS_FILL_ARGS)
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{
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sbuf_printf(sb, "%ld", (long)td->td_proc->p_pid);
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return (0);
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}
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/*
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* Adjust mode for some nodes that need it
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*/
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int
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procfs_attr(PFS_ATTR_ARGS)
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{
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PROC_LOCK_ASSERT(p, MA_OWNED);
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/* XXX inefficient, split into separate functions */
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if (strcmp(pn->pn_name, "ctl") == 0 ||
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strcmp(pn->pn_name, "note") == 0 ||
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strcmp(pn->pn_name, "notepg") == 0)
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vap->va_mode = 0200;
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else if (strcmp(pn->pn_name, "mem") == 0 ||
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strcmp(pn->pn_name, "regs") == 0 ||
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strcmp(pn->pn_name, "dbregs") == 0 ||
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strcmp(pn->pn_name, "fpregs") == 0)
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vap->va_mode = 0600;
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if ((p->p_flag & P_SUGID) && pn->pn_type != pfstype_procdir)
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vap->va_mode = 0;
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vap->va_uid = p->p_ucred->cr_uid;
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vap->va_gid = p->p_ucred->cr_gid;
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return (0);
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}
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/*
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* Visibility: some files only exist for non-system processes
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* Non-static because linprocfs uses it.
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*/
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int
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procfs_notsystem(PFS_VIS_ARGS)
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{
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PROC_LOCK_ASSERT(p, MA_OWNED);
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return ((p->p_flag & P_SYSTEM) == 0);
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}
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/*
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* Visibility: some files are only visible to process that can debug
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* the target process.
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*/
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int
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procfs_candebug(PFS_VIS_ARGS)
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{
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PROC_LOCK_ASSERT(p, MA_OWNED);
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return ((p->p_flag & P_SYSTEM) == 0 && p_candebug(td, p) == 0);
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}
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/*
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* Constructor
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*/
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static int
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procfs_init(PFS_INIT_ARGS)
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{
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struct pfs_node *root;
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struct pfs_node *dir;
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struct pfs_node *node;
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root = pi->pi_root;
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pfs_create_link(root, "curproc", procfs_docurproc,
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NULL, NULL, NULL, 0);
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dir = pfs_create_dir(root, "pid",
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procfs_attr, NULL, NULL, PFS_PROCDEP);
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pfs_create_file(dir, "cmdline", procfs_doproccmdline,
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NULL, NULL, NULL, PFS_RD);
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pfs_create_file(dir, "ctl", procfs_doprocctl,
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procfs_attr, NULL, NULL, PFS_WR);
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pfs_create_file(dir, "dbregs", procfs_doprocdbregs,
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procfs_attr, procfs_candebug, NULL, PFS_RDWR|PFS_RAW);
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pfs_create_file(dir, "etype", procfs_doproctype,
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NULL, NULL, NULL, PFS_RD);
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pfs_create_file(dir, "fpregs", procfs_doprocfpregs,
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procfs_attr, procfs_candebug, NULL, PFS_RDWR|PFS_RAW);
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pfs_create_file(dir, "map", procfs_doprocmap,
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NULL, procfs_notsystem, NULL, PFS_RD);
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node = pfs_create_file(dir, "mem", procfs_doprocmem,
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procfs_attr, procfs_candebug, NULL, PFS_RDWR|PFS_RAW);
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node->pn_ioctl = procfs_ioctl;
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node->pn_close = procfs_close;
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pfs_create_file(dir, "note", procfs_doprocnote,
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procfs_attr, procfs_candebug, NULL, PFS_WR);
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pfs_create_file(dir, "notepg", procfs_doprocnote,
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procfs_attr, procfs_candebug, NULL, PFS_WR);
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pfs_create_file(dir, "regs", procfs_doprocregs,
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procfs_attr, procfs_candebug, NULL, PFS_RDWR|PFS_RAW);
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pfs_create_file(dir, "rlimit", procfs_doprocrlimit,
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NULL, NULL, NULL, PFS_RD);
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pfs_create_file(dir, "status", procfs_doprocstatus,
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NULL, NULL, NULL, PFS_RD);
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pfs_create_link(dir, "file", procfs_doprocfile,
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NULL, procfs_notsystem, NULL, 0);
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return (0);
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}
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/*
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* Destructor
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*/
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static int
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procfs_uninit(PFS_INIT_ARGS)
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{
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/* nothing to do, pseudofs will GC */
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return (0);
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}
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PSEUDOFS(procfs, 1);
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