df57947f08
The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point. Initially, only tag files that use BSD 4-Clause "Original" license. RelNotes: yes Differential Revision: https://reviews.freebsd.org/D13133
212 lines
5.9 KiB
C
212 lines
5.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-4-Clause
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*
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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;
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char *freepath;
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struct vnode *textvp;
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int error;
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freepath = NULL;
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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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error = vn_fullpath(td, textvp, &fullpath, &freepath);
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vdrop(textvp);
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if (error == 0)
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sbuf_printf(sb, "%s", fullpath);
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if (freepath != NULL)
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free(freepath, M_TEMP);
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return (error);
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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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/* XXX inefficient, split into separate functions */
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if (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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strcmp(pn->pn_name, "osrel") == 0)
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vap->va_mode = 0600;
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if (p != NULL) {
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PROC_LOCK_ASSERT(p, MA_OWNED);
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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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}
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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, "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_file(dir, "osrel", procfs_doosrel,
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procfs_attr, procfs_candebug, NULL, PFS_RDWR);
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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, PR_ALLOW_MOUNT_PROCFS);
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