2 * Copyright (c) 1993, 1995 Jan-Simon Pendry
3 * Copyright (c) 1993, 1995
4 * The Regents of the University of California. All rights reserved.
6 * This code is derived from software contributed to Berkeley by
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10 * modification, are permitted provided that the following conditions
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13 * notice, this list of conditions and the following disclaimer.
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18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
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37 * @(#)procfs_vnops.c 8.18 (Berkeley) 5/21/95
39 * $FreeBSD: src/sys/miscfs/procfs/procfs_vnops.c,v 1.76.2.7 2002/01/22 17:22:59 nectar Exp $
40 * $DragonFly: src/sys/vfs/procfs/procfs_vnops.c,v 1.4 2003/06/25 03:56:00 dillon Exp $
44 * procfs vnode interface
47 #include <sys/param.h>
48 #include <sys/systm.h>
50 #include <sys/kernel.h>
52 #include <sys/fcntl.h>
54 #include <sys/signalvar.h>
55 #include <sys/vnode.h>
57 #include <sys/mount.h>
58 #include <sys/namei.h>
59 #include <sys/dirent.h>
60 #include <sys/malloc.h>
61 #include <machine/reg.h>
62 #include <vm/vm_zone.h>
63 #include <miscfs/procfs/procfs.h>
64 #include <sys/pioctl.h>
66 static int procfs_access __P((struct vop_access_args *));
67 static int procfs_badop __P((void));
68 static int procfs_bmap __P((struct vop_bmap_args *));
69 static int procfs_close __P((struct vop_close_args *));
70 static int procfs_getattr __P((struct vop_getattr_args *));
71 static int procfs_inactive __P((struct vop_inactive_args *));
72 static int procfs_ioctl __P((struct vop_ioctl_args *));
73 static int procfs_lookup __P((struct vop_lookup_args *));
74 static int procfs_open __P((struct vop_open_args *));
75 static int procfs_print __P((struct vop_print_args *));
76 static int procfs_readdir __P((struct vop_readdir_args *));
77 static int procfs_readlink __P((struct vop_readlink_args *));
78 static int procfs_reclaim __P((struct vop_reclaim_args *));
79 static int procfs_setattr __P((struct vop_setattr_args *));
82 * This is a list of the valid names in the
83 * process-specific sub-directories. It is
84 * used in procfs_lookup and procfs_readdir
86 static struct proc_target {
91 int (*pt_valid) __P((struct proc *p));
93 #define N(s) sizeof(s)-1, s
94 /* name type validp */
95 { DT_DIR, N("."), Pproc, NULL },
96 { DT_DIR, N(".."), Proot, NULL },
97 { DT_REG, N("mem"), Pmem, NULL },
98 { DT_REG, N("regs"), Pregs, procfs_validregs },
99 { DT_REG, N("fpregs"), Pfpregs, procfs_validfpregs },
100 { DT_REG, N("dbregs"), Pdbregs, procfs_validdbregs },
101 { DT_REG, N("ctl"), Pctl, NULL },
102 { DT_REG, N("status"), Pstatus, NULL },
103 { DT_REG, N("note"), Pnote, NULL },
104 { DT_REG, N("notepg"), Pnotepg, NULL },
105 { DT_REG, N("map"), Pmap, procfs_validmap },
106 { DT_REG, N("etype"), Ptype, procfs_validtype },
107 { DT_REG, N("cmdline"), Pcmdline, NULL },
108 { DT_REG, N("rlimit"), Prlimit, NULL },
109 { DT_LNK, N("file"), Pfile, NULL },
112 static const int nproc_targets = sizeof(proc_targets) / sizeof(proc_targets[0]);
114 static pid_t atopid __P((const char *, u_int));
117 * set things up for doing i/o on
118 * the pfsnode (vp). (vp) is locked
119 * on entry, and should be left locked
122 * for procfs we don't need to do anything
123 * in particular for i/o. all that is done
124 * is to support exclusive open on process
129 struct vop_open_args /* {
132 struct ucred *a_cred;
136 struct pfsnode *pfs = VTOPFS(ap->a_vp);
137 struct proc *p1, *p2;
139 p2 = PFIND(pfs->pfs_pid);
142 if (pfs->pfs_pid && !PRISON_CHECK(ap->a_cred, p2->p_ucred))
145 switch (pfs->pfs_type) {
147 if (((pfs->pfs_flags & FWRITE) && (ap->a_mode & O_EXCL)) ||
148 ((pfs->pfs_flags & O_EXCL) && (ap->a_mode & FWRITE)))
151 p1 = ap->a_td->td_proc;
153 /* Can't trace a process that's currently exec'ing. */
154 if ((p2->p_flag & P_INEXEC) != 0)
156 if (!CHECKIO(p1, p2) || p_trespass(ap->a_cred, p2->p_ucred))
159 if (ap->a_mode & FWRITE)
160 pfs->pfs_flags = ap->a_mode & (FWRITE|O_EXCL);
172 * close the pfsnode (vp) after doing i/o.
173 * (vp) is not locked on entry or exit.
175 * nothing to do for procfs other than undo
176 * any exclusive open flag (see _open above).
180 struct vop_close_args /* {
183 struct ucred *a_cred;
187 struct pfsnode *pfs = VTOPFS(ap->a_vp);
190 switch (pfs->pfs_type) {
192 if ((ap->a_fflag & FWRITE) && (pfs->pfs_flags & O_EXCL))
193 pfs->pfs_flags &= ~(FWRITE|O_EXCL);
195 * This rather complicated-looking code is trying to
196 * determine if this was the last close on this particular
197 * vnode. While one would expect v_usecount to be 1 at
198 * that point, it seems that (according to John Dyson)
199 * the VM system will bump up the usecount. So: if the
200 * usecount is 2, and VOBJBUF is set, then this is really
201 * the last close. Otherwise, if the usecount is < 2
202 * then it is definitely the last close.
203 * If this is the last close, then it checks to see if
204 * the target process has PF_LINGER set in p_pfsflags,
205 * if this is *not* the case, then the process' stop flags
206 * are cleared, and the process is woken up. This is
207 * to help prevent the case where a process has been
208 * told to stop on an event, but then the requesting process
209 * has gone away or forgotten about it.
211 if ((ap->a_vp->v_usecount < 2)
212 && (p = pfind(pfs->pfs_pid))
213 && !(p->p_pfsflags & PF_LINGER)) {
227 * do an ioctl operation on a pfsnode (vp).
228 * (vp) is not locked on entry or exit.
232 struct vop_ioctl_args *ap;
234 struct pfsnode *pfs = VTOPFS(ap->a_vp);
239 struct procfs_status *psp;
242 procp = pfind(pfs->pfs_pid);
245 p = ap->a_td->td_proc;
249 /* Can't trace a process that's currently exec'ing. */
250 if ((procp->p_flag & P_INEXEC) != 0)
252 if (!CHECKIO(p, procp) || p_trespass(ap->a_cred, procp->p_ucred))
255 switch (ap->a_command) {
257 procp->p_stops |= *(unsigned int*)ap->a_data;
260 procp->p_stops &= ~*(unsigned int*)ap->a_data;
264 * NFLAGS is "non-suser_xxx flags" -- currently, only
265 * PFS_ISUGID ("ignore set u/g id");
267 #define NFLAGS (PF_ISUGID)
268 flags = (unsigned char)*(unsigned int*)ap->a_data;
269 if (flags & NFLAGS && (error = suser_cred(ap->a_cred, 0)))
271 procp->p_pfsflags = flags;
274 *(unsigned int*)ap->a_data = (unsigned int)procp->p_pfsflags;
277 psp = (struct procfs_status *)ap->a_data;
278 psp->state = (procp->p_step == 0);
279 psp->flags = procp->p_pfsflags;
280 psp->events = procp->p_stops;
282 psp->why = procp->p_stype;
283 psp->val = procp->p_xstat;
285 psp->why = psp->val = 0; /* Not defined values */
289 psp = (struct procfs_status *)ap->a_data;
290 if (procp->p_step == 0) {
291 error = tsleep(&procp->p_stype, PWAIT | PCATCH, "piocwait", 0);
295 psp->state = 1; /* It stopped */
296 psp->flags = procp->p_pfsflags;
297 psp->events = procp->p_stops;
298 psp->why = procp->p_stype; /* why it stopped */
299 psp->val = procp->p_xstat; /* any extra info */
301 case PIOCCONT: /* Restart a proc */
302 if (procp->p_step == 0)
303 return EINVAL; /* Can only start a stopped process */
304 if ((signo = *(int*)ap->a_data) != 0) {
305 if (signo >= NSIG || signo <= 0)
307 psignal(procp, signo);
310 wakeup(&procp->p_step);
319 * do block mapping for pfsnode (vp).
320 * since we don't use the buffer cache
321 * for procfs this function should never
322 * be called. in any case, it's not clear
323 * what part of the kernel ever makes use
324 * of this function. for sanity, this is the
325 * usual no-op bmap, although returning
326 * (EIO) would be a reasonable alternative.
330 struct vop_bmap_args /* {
333 struct vnode **a_vpp;
339 if (ap->a_vpp != NULL)
340 *ap->a_vpp = ap->a_vp;
341 if (ap->a_bnp != NULL)
342 *ap->a_bnp = ap->a_bn;
343 if (ap->a_runp != NULL)
349 * procfs_inactive is called when the pfsnode
350 * is vrele'd and the reference count goes
351 * to zero. (vp) will be on the vnode free
352 * list, so to get it back vget() must be
355 * (vp) is locked on entry, but must be unlocked on exit.
359 struct vop_inactive_args /* {
364 struct vnode *vp = ap->a_vp;
366 VOP_UNLOCK(vp, 0, ap->a_td);
372 * _reclaim is called when getnewvnode()
373 * wants to make use of an entry on the vnode
374 * free list. at this time the filesystem needs
375 * to free any private data and remove the node
376 * from any private lists.
380 struct vop_reclaim_args /* {
385 return (procfs_freevp(ap->a_vp));
389 * _print is used for debugging.
390 * just print a readable description
395 struct vop_print_args /* {
399 struct pfsnode *pfs = VTOPFS(ap->a_vp);
401 printf("tag VT_PROCFS, type %d, pid %ld, mode %x, flags %lx\n",
402 pfs->pfs_type, (long)pfs->pfs_pid, pfs->pfs_mode, pfs->pfs_flags);
407 * generic entry point for unsupported operations
417 * Invent attributes for pfsnode (vp) and store
419 * Directories lengths are returned as zero since
420 * any real length would require the genuine size
421 * to be computed, and nothing cares anyway.
423 * this is relatively minimal for procfs.
427 struct vop_getattr_args /* {
430 struct ucred *a_cred;
434 struct pfsnode *pfs = VTOPFS(ap->a_vp);
435 struct vattr *vap = ap->a_vap;
440 * First make sure that the process and its credentials
443 switch (pfs->pfs_type) {
450 procp = PFIND(pfs->pfs_pid);
451 if (procp == NULL || procp->p_ucred == NULL)
457 /* start by zeroing out the attributes */
460 /* next do all the common fields */
461 vap->va_type = ap->a_vp->v_type;
462 vap->va_mode = pfs->pfs_mode;
463 vap->va_fileid = pfs->pfs_fileno;
465 vap->va_blocksize = PAGE_SIZE;
466 vap->va_bytes = vap->va_size = 0;
467 vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0];
470 * Make all times be current TOD.
471 * It would be possible to get the process start
472 * time from the p_stat structure, but there's
473 * no "file creation" time stamp anyway, and the
474 * p_stat structure is not addressible if u. gets
475 * swapped out for that process.
477 nanotime(&vap->va_ctime);
478 vap->va_atime = vap->va_mtime = vap->va_ctime;
481 * If the process has exercised some setuid or setgid
482 * privilege, then rip away read/write permission so
483 * that only root can gain access.
485 switch (pfs->pfs_type) {
491 if (procp->p_flag & P_SUGID)
492 vap->va_mode &= ~((VREAD|VWRITE)|
494 ((VREAD|VWRITE)>>6));
501 * now do the object specific fields
503 * The size could be set from struct reg, but it's hardly
504 * worth the trouble, and it puts some (potentially) machine
505 * dependent data into this machine-independent code. If it
506 * becomes important then this function should break out into
507 * a per-file stat function in the corresponding .c file.
512 vap->va_uid = procp->p_ucred->cr_uid;
513 vap->va_gid = procp->p_ucred->cr_gid;
516 switch (pfs->pfs_type) {
519 * Set nlink to 1 to tell fts(3) we don't actually know.
524 vap->va_size = vap->va_bytes = DEV_BSIZE;
528 char buf[16]; /* should be enough */
531 vap->va_size = vap->va_bytes =
532 snprintf(buf, sizeof(buf), "%ld", (long)curproc->p_pid);
537 vap->va_nlink = nproc_targets;
538 vap->va_size = vap->va_bytes = DEV_BSIZE;
542 char *fullpath, *freepath;
543 error = textvp_fullpath(procp, &fullpath, &freepath);
545 vap->va_size = strlen(fullpath);
546 free(freepath, M_TEMP);
548 vap->va_size = sizeof("unknown") - 1;
551 vap->va_bytes = vap->va_size;
557 * If we denied owner access earlier, then we have to
558 * change the owner to root - otherwise 'ps' and friends
559 * will break even though they are setgid kmem. *SIGH*
561 if (procp->p_flag & P_SUGID)
564 vap->va_uid = procp->p_ucred->cr_uid;
568 vap->va_bytes = vap->va_size = sizeof(struct reg);
572 vap->va_bytes = vap->va_size = sizeof(struct fpreg);
576 vap->va_bytes = vap->va_size = sizeof(struct dbreg);
590 panic("procfs_getattr");
598 struct vop_setattr_args /* {
601 struct ucred *a_cred;
606 if (ap->a_vap->va_flags != VNOVAL)
610 * just fake out attribute setting
611 * it's not good to generate an error
612 * return, otherwise things like creat()
613 * will fail when they try to set the
614 * file length to 0. worse, this means
615 * that echo $note > /proc/$pid/note will fail.
622 * implement access checking.
624 * something very similar to this code is duplicated
625 * throughout the 4bsd kernel and should be moved
626 * into kern/vfs_subr.c sometime.
628 * actually, the check for super-user is slightly
629 * broken since it will allow read access to write-only
630 * objects. this doesn't cause any particular trouble
631 * but does mean that the i/o entry points need to check
632 * that the operation really does make sense.
636 struct vop_access_args /* {
639 struct ucred *a_cred;
648 * If you're the super-user,
649 * you always get access.
651 if (ap->a_cred->cr_uid == 0)
655 error = VOP_GETATTR(ap->a_vp, vap, ap->a_cred, ap->a_td);
660 * Access check is based on only one of owner, group, public.
661 * If not owner, then check group. If not a member of the
662 * group, then check public access.
664 if (ap->a_cred->cr_uid != vap->va_uid) {
669 gp = ap->a_cred->cr_groups;
670 for (i = 0; i < ap->a_cred->cr_ngroups; i++, gp++)
671 if (vap->va_gid == *gp)
678 if ((vap->va_mode & ap->a_mode) == ap->a_mode)
685 * lookup. this is incredibly complicated in the
686 * general case, however for most pseudo-filesystems
687 * very little needs to be done.
689 * unless you want to get a migraine, just make sure your
690 * filesystem doesn't do any locking of its own. otherwise
691 * read and inwardly digest ufs_lookup().
695 struct vop_lookup_args /* {
696 struct vnode * a_dvp;
697 struct vnode ** a_vpp;
698 struct componentname * a_cnp;
701 struct componentname *cnp = ap->a_cnp;
702 struct vnode **vpp = ap->a_vpp;
703 struct vnode *dvp = ap->a_dvp;
704 char *pname = cnp->cn_nameptr;
705 /* struct proc *curp = cnp->cn_proc; */
706 struct proc_target *pt;
714 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)
717 if (cnp->cn_namelen == 1 && *pname == '.') {
720 /* vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, curp); */
725 switch (pfs->pfs_type) {
727 if (cnp->cn_flags & ISDOTDOT)
730 if (CNEQ(cnp, "curproc", 7))
731 return (procfs_allocvp(dvp->v_mount, vpp, 0, Pcurproc));
733 pid = atopid(pname, cnp->cn_namelen);
741 return (procfs_allocvp(dvp->v_mount, vpp, pid, Pproc));
744 if (cnp->cn_flags & ISDOTDOT)
745 return (procfs_root(dvp->v_mount, vpp));
747 p = PFIND(pfs->pfs_pid);
751 for (pt = proc_targets, i = 0; i < nproc_targets; pt++, i++) {
752 if (cnp->cn_namelen == pt->pt_namlen &&
753 bcmp(pt->pt_name, pname, cnp->cn_namelen) == 0 &&
754 (pt->pt_valid == NULL || (*pt->pt_valid)(p)))
759 return (procfs_allocvp(dvp->v_mount, vpp, pfs->pfs_pid,
766 return (cnp->cn_nameiop == LOOKUP ? ENOENT : EROFS);
770 * Does this process have a text file?
777 return (procfs_findtextvp(p) != NULLVP);
781 * readdir() returns directory entries from pfsnode (vp).
783 * We generate just one directory entry at a time, as it would probably
784 * not pay off to buffer several entries locally to save uiomove calls.
788 struct vop_readdir_args /* {
791 struct ucred *a_cred;
797 struct uio *uio = ap->a_uio;
799 struct dirent *dp = &d;
801 int count, error, i, off;
806 d.d_namlen = PROCFS_NAMELEN;
807 delen = GENERIC_DIRSIZ(&d);
810 pfs = VTOPFS(ap->a_vp);
812 off = (int)uio->uio_offset;
813 if (off != uio->uio_offset || off < 0 ||
814 off % delen != 0 || uio->uio_resid < delen)
821 switch (pfs->pfs_type) {
823 * this is for the process-specific sub-directories.
824 * all that is needed to is copy out all the entries
825 * from the procent[] table (top of this file).
829 struct proc_target *pt;
831 p = PFIND(pfs->pfs_pid);
834 if (!PRISON_CHECK(ap->a_cred, p->p_ucred))
837 for (pt = &proc_targets[i];
838 uio->uio_resid >= delen && i < nproc_targets; pt++, i++) {
839 if (pt->pt_valid && (*pt->pt_valid)(p) == 0)
842 dp->d_reclen = delen;
843 dp->d_fileno = PROCFS_FILENO(pfs->pfs_pid, pt->pt_pfstype);
844 dp->d_namlen = pt->pt_namlen;
845 bcopy(pt->pt_name, dp->d_name, pt->pt_namlen + 1);
846 dp->d_type = pt->pt_type;
848 if ((error = uiomove((caddr_t)dp, delen, uio)) != 0)
856 * this is for the root of the procfs filesystem
857 * what is needed is a special entry for "curproc"
858 * followed by an entry for each process on allproc
869 volatile struct proc *p = allproc.lh_first;
871 for (; p && uio->uio_resid >= delen; i++, pcnt++) {
872 bzero((char *) dp, delen);
873 dp->d_reclen = delen;
878 dp->d_fileno = PROCFS_FILENO(0, Proot);
879 dp->d_namlen = i + 1;
880 bcopy("..", dp->d_name, dp->d_namlen);
881 dp->d_name[i + 1] = '\0';
886 dp->d_fileno = PROCFS_FILENO(0, Pcurproc);
888 bcopy("curproc", dp->d_name, 8);
894 p = p->p_list.le_next;
897 if (!PRISON_CHECK(ap->a_cred, p->p_ucred))
901 while (!PRISON_CHECK(ap->a_cred, p->p_ucred)) {
902 p = p->p_list.le_next;
906 dp->d_fileno = PROCFS_FILENO(p->p_pid, Pproc);
907 dp->d_namlen = sprintf(dp->d_name, "%ld",
910 p = p->p_list.le_next;
914 if ((error = uiomove((caddr_t)dp, delen, uio)) != 0)
920 if (p == NULL && doingzomb == 0) {
922 p = zombproc.lh_first;
936 uio->uio_offset = i * delen;
942 * readlink reads the link of `curproc' or `file'
946 struct vop_readlink_args *ap;
948 char buf[16]; /* should be enough */
950 struct vnode *vp = ap->a_vp;
951 struct pfsnode *pfs = VTOPFS(vp);
952 char *fullpath, *freepath;
955 switch (pfs->pfs_type) {
957 if (pfs->pfs_fileno != PROCFS_FILENO(0, Pcurproc))
960 len = snprintf(buf, sizeof(buf), "%ld", (long)curproc->p_pid);
962 return (uiomove(buf, len, ap->a_uio));
964 * There _should_ be no way for an entire process to disappear
968 procp = PFIND(pfs->pfs_pid);
969 if (procp == NULL || procp->p_ucred == NULL) {
970 printf("procfs_readlink: pid %d disappeared\n",
972 return (uiomove("unknown", sizeof("unknown") - 1,
975 error = textvp_fullpath(procp, &fullpath, &freepath);
977 return (uiomove("unknown", sizeof("unknown") - 1,
979 error = uiomove(fullpath, strlen(fullpath), ap->a_uio);
980 free(freepath, M_TEMP);
988 * convert decimal ascii to pid_t
999 if (c < '0' || c > '9')
1001 p = 10 * p + (c - '0');
1010 * procfs vnode operations.
1012 vop_t **procfs_vnodeop_p;
1013 static struct vnodeopv_entry_desc procfs_vnodeop_entries[] = {
1014 { &vop_default_desc, (vop_t *) vop_defaultop },
1015 { &vop_access_desc, (vop_t *) procfs_access },
1016 { &vop_advlock_desc, (vop_t *) procfs_badop },
1017 { &vop_bmap_desc, (vop_t *) procfs_bmap },
1018 { &vop_close_desc, (vop_t *) procfs_close },
1019 { &vop_create_desc, (vop_t *) procfs_badop },
1020 { &vop_getattr_desc, (vop_t *) procfs_getattr },
1021 { &vop_inactive_desc, (vop_t *) procfs_inactive },
1022 { &vop_link_desc, (vop_t *) procfs_badop },
1023 { &vop_lookup_desc, (vop_t *) procfs_lookup },
1024 { &vop_mkdir_desc, (vop_t *) procfs_badop },
1025 { &vop_mknod_desc, (vop_t *) procfs_badop },
1026 { &vop_open_desc, (vop_t *) procfs_open },
1027 { &vop_pathconf_desc, (vop_t *) vop_stdpathconf },
1028 { &vop_print_desc, (vop_t *) procfs_print },
1029 { &vop_read_desc, (vop_t *) procfs_rw },
1030 { &vop_readdir_desc, (vop_t *) procfs_readdir },
1031 { &vop_readlink_desc, (vop_t *) procfs_readlink },
1032 { &vop_reclaim_desc, (vop_t *) procfs_reclaim },
1033 { &vop_remove_desc, (vop_t *) procfs_badop },
1034 { &vop_rename_desc, (vop_t *) procfs_badop },
1035 { &vop_rmdir_desc, (vop_t *) procfs_badop },
1036 { &vop_setattr_desc, (vop_t *) procfs_setattr },
1037 { &vop_symlink_desc, (vop_t *) procfs_badop },
1038 { &vop_write_desc, (vop_t *) procfs_rw },
1039 { &vop_ioctl_desc, (vop_t *) procfs_ioctl },
1042 static struct vnodeopv_desc procfs_vnodeop_opv_desc =
1043 { &procfs_vnodeop_p, procfs_vnodeop_entries };
1045 VNODEOP_SET(procfs_vnodeop_opv_desc);