1/*- 2 * Copyright (c) 1992, 1993, 1995 3 * The Regents of the University of California. All rights reserved. 4 * Copyright (c) 2000 5 * Poul-Henning Kamp. All rights reserved. 6 * 7 * This code is derived from software donated to Berkeley by 8 * Jan-Simon Pendry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)kernfs_vfsops.c 8.10 (Berkeley) 5/14/95 32 * From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vfsops.c 1.36 33 *
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34 * $FreeBSD: head/sys/fs/devfs/devfs_vfsops.c 231267 2012-02-09 10:22:08Z mm $
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34 * $FreeBSD: head/sys/fs/devfs/devfs_vfsops.c 232059 2012-02-23 18:51:24Z mm $ |
35 */ 36 37#include <sys/param.h> 38#include <sys/systm.h> 39#include <sys/kernel.h> 40#include <sys/lock.h> 41#include <sys/malloc.h> 42#include <sys/mount.h> 43#include <sys/proc.h> 44#include <sys/sx.h> 45#include <sys/vnode.h> 46#include <sys/limits.h> 47#include <sys/jail.h> 48 49#include <fs/devfs/devfs.h> 50 51static struct unrhdr *devfs_unr; 52 53MALLOC_DEFINE(M_DEVFS, "DEVFS", "DEVFS data"); 54 55static vfs_mount_t devfs_mount; 56static vfs_unmount_t devfs_unmount; 57static vfs_root_t devfs_root; 58static vfs_statfs_t devfs_statfs; 59 60static const char *devfs_opts[] = { 61 "from", "ruleset", NULL 62}; 63 64/* 65 * Mount the filesystem 66 */ 67static int 68devfs_mount(struct mount *mp) 69{ 70 int error; 71 struct devfs_mount *fmp; 72 struct vnode *rvp; 73 struct thread *td = curthread;
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74 int rsnum;
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74 int injail, rsnum; |
75 76 if (devfs_unr == NULL) 77 devfs_unr = new_unrhdr(0, INT_MAX, NULL); 78 79 error = 0; 80 81 if (mp->mnt_flag & MNT_ROOTFS) 82 return (EOPNOTSUPP); 83
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84 if (!prison_allow(td->td_ucred, PR_ALLOW_MOUNT_DEVFS)) 85 return (EPERM); 86 |
87 rsnum = 0;
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88 injail = jailed(td->td_ucred); |
89 90 if (mp->mnt_optnew != NULL) { 91 if (vfs_filteropt(mp->mnt_optnew, devfs_opts)) 92 return (EINVAL); 93 94 if (vfs_getopt(mp->mnt_optnew, "ruleset", NULL, NULL) == 0 && 95 (vfs_scanopt(mp->mnt_optnew, "ruleset", "%d",
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92 &rsnum) != 1 || rsnum < 0 || rsnum > 65535))
93 error = EINVAL;
94 }
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96 &rsnum) != 1 || rsnum < 0 || rsnum > 65535)) { 97 vfs_mount_error(mp, "%s", 98 "invalid ruleset specification"); 99 return (EINVAL); 100 } |
101
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96 /* jails enforce their ruleset, prison0 has no restrictions */
97 if (td->td_ucred->cr_prison->pr_devfs_rsnum != 0) {
98 rsnum = td->td_ucred->cr_prison->pr_devfs_rsnum;
99 if (rsnum == -1)
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102 if (injail && rsnum != 0 && 103 rsnum != td->td_ucred->cr_prison->pr_devfs_rsnum) |
104 return (EPERM);
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101 /* check rsnum for sanity, devfs_rsnum is uint16_t */
102 if (rsnum < 0 || rsnum > 65535)
103 error = EINVAL;
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105 } 106
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106 if (error) {
107 vfs_mount_error(mp, "%s", "invalid ruleset specification");
108 return (error);
109 }
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107 /* jails enforce their ruleset */ 108 if (injail) 109 rsnum = td->td_ucred->cr_prison->pr_devfs_rsnum; |
110 111 if (mp->mnt_flag & MNT_UPDATE) { 112 if (rsnum != 0) { 113 fmp = mp->mnt_data; 114 if (fmp != NULL) { 115 sx_xlock(&fmp->dm_lock); 116 devfs_ruleset_set((devfs_rsnum)rsnum, fmp); 117 devfs_ruleset_apply(fmp); 118 sx_xunlock(&fmp->dm_lock); 119 } 120 } 121 return (0); 122 } 123 124 fmp = malloc(sizeof *fmp, M_DEVFS, M_WAITOK | M_ZERO); 125 fmp->dm_idx = alloc_unr(devfs_unr); 126 sx_init(&fmp->dm_lock, "devfsmount"); 127 fmp->dm_holdcnt = 1; 128 129 MNT_ILOCK(mp); 130 mp->mnt_flag |= MNT_LOCAL; 131 mp->mnt_kern_flag |= MNTK_MPSAFE | MNTK_LOOKUP_SHARED | 132 MNTK_EXTENDED_SHARED; 133#ifdef MAC 134 mp->mnt_flag |= MNT_MULTILABEL; 135#endif 136 MNT_IUNLOCK(mp); 137 fmp->dm_mount = mp; 138 mp->mnt_data = (void *) fmp; 139 vfs_getnewfsid(mp); 140 141 fmp->dm_rootdir = devfs_vmkdir(fmp, NULL, 0, NULL, DEVFS_ROOTINO); 142 143 error = devfs_root(mp, LK_EXCLUSIVE, &rvp); 144 if (error) { 145 sx_destroy(&fmp->dm_lock); 146 free_unr(devfs_unr, fmp->dm_idx); 147 free(fmp, M_DEVFS); 148 return (error); 149 } 150 151 if (rsnum != 0) { 152 sx_xlock(&fmp->dm_lock); 153 devfs_ruleset_set((devfs_rsnum)rsnum, fmp); 154 sx_xunlock(&fmp->dm_lock); 155 } 156 157 VOP_UNLOCK(rvp, 0); 158 159 vfs_mountedfrom(mp, "devfs"); 160 161 return (0); 162} 163 164void 165devfs_unmount_final(struct devfs_mount *fmp) 166{ 167 sx_destroy(&fmp->dm_lock); 168 free(fmp, M_DEVFS); 169} 170 171static int 172devfs_unmount(struct mount *mp, int mntflags) 173{ 174 int error; 175 int flags = 0; 176 struct devfs_mount *fmp; 177 int hold; 178 u_int idx; 179 180 fmp = VFSTODEVFS(mp); 181 KASSERT(fmp->dm_mount != NULL, 182 ("devfs_unmount unmounted devfs_mount")); 183 /* There is 1 extra root vnode reference from devfs_mount(). */ 184 error = vflush(mp, 1, flags, curthread); 185 if (error) 186 return (error); 187 sx_xlock(&fmp->dm_lock); 188 devfs_cleanup(fmp); 189 devfs_rules_cleanup(fmp); 190 fmp->dm_mount = NULL; 191 hold = --fmp->dm_holdcnt; 192 mp->mnt_data = NULL; 193 idx = fmp->dm_idx; 194 sx_xunlock(&fmp->dm_lock); 195 free_unr(devfs_unr, idx); 196 if (hold == 0) 197 devfs_unmount_final(fmp); 198 return 0; 199} 200 201/* Return locked reference to root. */ 202 203static int 204devfs_root(struct mount *mp, int flags, struct vnode **vpp) 205{ 206 int error; 207 struct vnode *vp; 208 struct devfs_mount *dmp; 209 210 dmp = VFSTODEVFS(mp); 211 sx_xlock(&dmp->dm_lock); 212 error = devfs_allocv(dmp->dm_rootdir, mp, LK_EXCLUSIVE, &vp); 213 if (error) 214 return (error); 215 vp->v_vflag |= VV_ROOT; 216 *vpp = vp; 217 return (0); 218} 219 220static int 221devfs_statfs(struct mount *mp, struct statfs *sbp) 222{ 223 224 sbp->f_flags = 0; 225 sbp->f_bsize = DEV_BSIZE; 226 sbp->f_iosize = DEV_BSIZE; 227 sbp->f_blocks = 2; /* 1K to keep df happy */ 228 sbp->f_bfree = 0; 229 sbp->f_bavail = 0; 230 sbp->f_files = 0; 231 sbp->f_ffree = 0; 232 return (0); 233} 234 235static struct vfsops devfs_vfsops = { 236 .vfs_mount = devfs_mount, 237 .vfs_root = devfs_root, 238 .vfs_statfs = devfs_statfs, 239 .vfs_unmount = devfs_unmount, 240}; 241 242VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC | VFCF_JAIL);
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