1c11f552d6
by doing most of the work in a new function prison_add_vfs in kern_jail.c Now a jail-enabled filesystem need only mark itself with VFCF_JAIL, and the rest is taken care of. This includes adding a jail parameter like allow.mount.foofs, and a sysctl like security.jail.mount_foofs_allowed. Both of these used to be a static list of known filesystems, with predefined permission bits. Reviewed by: kib Differential Revision: D14681
219 lines
5.8 KiB
C
219 lines
5.8 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/file
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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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static int
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procfs_attr(PFS_ATTR_ARGS, int mode) {
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vap->va_mode = mode;
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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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int
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procfs_attr_all_rx(PFS_ATTR_ARGS)
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{
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return (procfs_attr(td, p, pn, vap, 0555));
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}
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int
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procfs_attr_rw(PFS_ATTR_ARGS)
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{
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return (procfs_attr(td, p, pn, vap, 0600));
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}
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int
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procfs_attr_w(PFS_ATTR_ARGS)
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{
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return (procfs_attr(td, p, pn, vap, 0200));
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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_all_rx, 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_rw, 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_rw, 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_rw, 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_w, procfs_candebug, NULL, PFS_WR);
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pfs_create_file(dir, "notepg", procfs_doprocnote,
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procfs_attr_w, procfs_candebug, NULL, PFS_WR);
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pfs_create_file(dir, "regs", procfs_doprocregs,
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procfs_attr_rw, 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_rw, 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, VFCF_JAIL);
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