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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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 $
43 * procfs vnode interface
46 #include <sys/param.h>
47 #include <sys/systm.h>
49 #include <sys/kernel.h>
51 #include <sys/fcntl.h>
53 #include <sys/signalvar.h>
54 #include <sys/vnode.h>
56 #include <sys/mount.h>
57 #include <sys/namei.h>
58 #include <sys/dirent.h>
59 #include <sys/malloc.h>
60 #include <machine/reg.h>
61 #include <vm/vm_zone.h>
62 #include <miscfs/procfs/procfs.h>
63 #include <sys/pioctl.h>
65 static int procfs_access __P((struct vop_access_args *));
66 static int procfs_badop __P((void));
67 static int procfs_bmap __P((struct vop_bmap_args *));
68 static int procfs_close __P((struct vop_close_args *));
69 static int procfs_getattr __P((struct vop_getattr_args *));
70 static int procfs_inactive __P((struct vop_inactive_args *));
71 static int procfs_ioctl __P((struct vop_ioctl_args *));
72 static int procfs_lookup __P((struct vop_lookup_args *));
73 static int procfs_open __P((struct vop_open_args *));
74 static int procfs_print __P((struct vop_print_args *));
75 static int procfs_readdir __P((struct vop_readdir_args *));
76 static int procfs_readlink __P((struct vop_readlink_args *));
77 static int procfs_reclaim __P((struct vop_reclaim_args *));
78 static int procfs_setattr __P((struct vop_setattr_args *));
81 * This is a list of the valid names in the
82 * process-specific sub-directories. It is
83 * used in procfs_lookup and procfs_readdir
85 static struct proc_target {
90 int (*pt_valid) __P((struct proc *p));
92 #define N(s) sizeof(s)-1, s
93 /* name type validp */
94 { DT_DIR, N("."), Pproc, NULL },
95 { DT_DIR, N(".."), Proot, NULL },
96 { DT_REG, N("mem"), Pmem, NULL },
97 { DT_REG, N("regs"), Pregs, procfs_validregs },
98 { DT_REG, N("fpregs"), Pfpregs, procfs_validfpregs },
99 { DT_REG, N("dbregs"), Pdbregs, procfs_validdbregs },
100 { DT_REG, N("ctl"), Pctl, NULL },
101 { DT_REG, N("status"), Pstatus, NULL },
102 { DT_REG, N("note"), Pnote, NULL },
103 { DT_REG, N("notepg"), Pnotepg, NULL },
104 { DT_REG, N("map"), Pmap, procfs_validmap },
105 { DT_REG, N("etype"), Ptype, procfs_validtype },
106 { DT_REG, N("cmdline"), Pcmdline, NULL },
107 { DT_REG, N("rlimit"), Prlimit, NULL },
108 { DT_LNK, N("file"), Pfile, NULL },
111 static const int nproc_targets = sizeof(proc_targets) / sizeof(proc_targets[0]);
113 static pid_t atopid __P((const char *, u_int));
116 * set things up for doing i/o on
117 * the pfsnode (vp). (vp) is locked
118 * on entry, and should be left locked
121 * for procfs we don't need to do anything
122 * in particular for i/o. all that is done
123 * is to support exclusive open on process
128 struct vop_open_args /* {
131 struct ucred *a_cred;
135 struct pfsnode *pfs = VTOPFS(ap->a_vp);
136 struct proc *p1, *p2;
138 p2 = PFIND(pfs->pfs_pid);
141 if (pfs->pfs_pid && !PRISON_CHECK(ap->a_p, p2))
144 switch (pfs->pfs_type) {
146 if (((pfs->pfs_flags & FWRITE) && (ap->a_mode & O_EXCL)) ||
147 ((pfs->pfs_flags & O_EXCL) && (ap->a_mode & FWRITE)))
151 /* Can't trace a process that's currently exec'ing. */
152 if ((p2->p_flag & P_INEXEC) != 0)
154 if (!CHECKIO(p1, p2) || p_trespass(p1, p2))
157 if (ap->a_mode & FWRITE)
158 pfs->pfs_flags = ap->a_mode & (FWRITE|O_EXCL);
170 * close the pfsnode (vp) after doing i/o.
171 * (vp) is not locked on entry or exit.
173 * nothing to do for procfs other than undo
174 * any exclusive open flag (see _open above).
178 struct vop_close_args /* {
181 struct ucred *a_cred;
185 struct pfsnode *pfs = VTOPFS(ap->a_vp);
188 switch (pfs->pfs_type) {
190 if ((ap->a_fflag & FWRITE) && (pfs->pfs_flags & O_EXCL))
191 pfs->pfs_flags &= ~(FWRITE|O_EXCL);
193 * This rather complicated-looking code is trying to
194 * determine if this was the last close on this particular
195 * vnode. While one would expect v_usecount to be 1 at
196 * that point, it seems that (according to John Dyson)
197 * the VM system will bump up the usecount. So: if the
198 * usecount is 2, and VOBJBUF is set, then this is really
199 * the last close. Otherwise, if the usecount is < 2
200 * then it is definitely the last close.
201 * If this is the last close, then it checks to see if
202 * the target process has PF_LINGER set in p_pfsflags,
203 * if this is *not* the case, then the process' stop flags
204 * are cleared, and the process is woken up. This is
205 * to help prevent the case where a process has been
206 * told to stop on an event, but then the requesting process
207 * has gone away or forgotten about it.
209 if ((ap->a_vp->v_usecount < 2)
210 && (p = pfind(pfs->pfs_pid))
211 && !(p->p_pfsflags & PF_LINGER)) {
225 * do an ioctl operation on a pfsnode (vp).
226 * (vp) is not locked on entry or exit.
230 struct vop_ioctl_args *ap;
232 struct pfsnode *pfs = VTOPFS(ap->a_vp);
233 struct proc *procp, *p;
236 struct procfs_status *psp;
240 procp = pfind(pfs->pfs_pid);
245 /* Can't trace a process that's currently exec'ing. */
246 if ((procp->p_flag & P_INEXEC) != 0)
248 if (!CHECKIO(p, procp) || p_trespass(p, procp))
251 switch (ap->a_command) {
253 procp->p_stops |= *(unsigned int*)ap->a_data;
256 procp->p_stops &= ~*(unsigned int*)ap->a_data;
260 * NFLAGS is "non-suser_xxx flags" -- currently, only
261 * PFS_ISUGID ("ignore set u/g id");
263 #define NFLAGS (PF_ISUGID)
264 flags = (unsigned char)*(unsigned int*)ap->a_data;
265 if (flags & NFLAGS && (error = suser(p)))
267 procp->p_pfsflags = flags;
270 *(unsigned int*)ap->a_data = (unsigned int)procp->p_pfsflags;
273 psp = (struct procfs_status *)ap->a_data;
274 psp->state = (procp->p_step == 0);
275 psp->flags = procp->p_pfsflags;
276 psp->events = procp->p_stops;
278 psp->why = procp->p_stype;
279 psp->val = procp->p_xstat;
281 psp->why = psp->val = 0; /* Not defined values */
285 psp = (struct procfs_status *)ap->a_data;
286 if (procp->p_step == 0) {
287 error = tsleep(&procp->p_stype, PWAIT | PCATCH, "piocwait", 0);
291 psp->state = 1; /* It stopped */
292 psp->flags = procp->p_pfsflags;
293 psp->events = procp->p_stops;
294 psp->why = procp->p_stype; /* why it stopped */
295 psp->val = procp->p_xstat; /* any extra info */
297 case PIOCCONT: /* Restart a proc */
298 if (procp->p_step == 0)
299 return EINVAL; /* Can only start a stopped process */
300 if ((signo = *(int*)ap->a_data) != 0) {
301 if (signo >= NSIG || signo <= 0)
303 psignal(procp, signo);
306 wakeup(&procp->p_step);
315 * do block mapping for pfsnode (vp).
316 * since we don't use the buffer cache
317 * for procfs this function should never
318 * be called. in any case, it's not clear
319 * what part of the kernel ever makes use
320 * of this function. for sanity, this is the
321 * usual no-op bmap, although returning
322 * (EIO) would be a reasonable alternative.
326 struct vop_bmap_args /* {
329 struct vnode **a_vpp;
335 if (ap->a_vpp != NULL)
336 *ap->a_vpp = ap->a_vp;
337 if (ap->a_bnp != NULL)
338 *ap->a_bnp = ap->a_bn;
339 if (ap->a_runp != NULL)
345 * procfs_inactive is called when the pfsnode
346 * is vrele'd and the reference count goes
347 * to zero. (vp) will be on the vnode free
348 * list, so to get it back vget() must be
351 * (vp) is locked on entry, but must be unlocked on exit.
355 struct vop_inactive_args /* {
359 struct vnode *vp = ap->a_vp;
361 VOP_UNLOCK(vp, 0, ap->a_p);
367 * _reclaim is called when getnewvnode()
368 * wants to make use of an entry on the vnode
369 * free list. at this time the filesystem needs
370 * to free any private data and remove the node
371 * from any private lists.
375 struct vop_reclaim_args /* {
380 return (procfs_freevp(ap->a_vp));
384 * _print is used for debugging.
385 * just print a readable description
390 struct vop_print_args /* {
394 struct pfsnode *pfs = VTOPFS(ap->a_vp);
396 printf("tag VT_PROCFS, type %d, pid %ld, mode %x, flags %lx\n",
397 pfs->pfs_type, (long)pfs->pfs_pid, pfs->pfs_mode, pfs->pfs_flags);
402 * generic entry point for unsupported operations
412 * Invent attributes for pfsnode (vp) and store
414 * Directories lengths are returned as zero since
415 * any real length would require the genuine size
416 * to be computed, and nothing cares anyway.
418 * this is relatively minimal for procfs.
422 struct vop_getattr_args /* {
425 struct ucred *a_cred;
429 struct pfsnode *pfs = VTOPFS(ap->a_vp);
430 struct vattr *vap = ap->a_vap;
435 * First make sure that the process and its credentials
438 switch (pfs->pfs_type) {
445 procp = PFIND(pfs->pfs_pid);
446 if (procp == NULL || procp->p_cred == NULL ||
447 procp->p_ucred == NULL)
453 /* start by zeroing out the attributes */
456 /* next do all the common fields */
457 vap->va_type = ap->a_vp->v_type;
458 vap->va_mode = pfs->pfs_mode;
459 vap->va_fileid = pfs->pfs_fileno;
461 vap->va_blocksize = PAGE_SIZE;
462 vap->va_bytes = vap->va_size = 0;
463 vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0];
466 * Make all times be current TOD.
467 * It would be possible to get the process start
468 * time from the p_stat structure, but there's
469 * no "file creation" time stamp anyway, and the
470 * p_stat structure is not addressible if u. gets
471 * swapped out for that process.
473 nanotime(&vap->va_ctime);
474 vap->va_atime = vap->va_mtime = vap->va_ctime;
477 * If the process has exercised some setuid or setgid
478 * privilege, then rip away read/write permission so
479 * that only root can gain access.
481 switch (pfs->pfs_type) {
487 if (procp->p_flag & P_SUGID)
488 vap->va_mode &= ~((VREAD|VWRITE)|
490 ((VREAD|VWRITE)>>6));
497 * now do the object specific fields
499 * The size could be set from struct reg, but it's hardly
500 * worth the trouble, and it puts some (potentially) machine
501 * dependent data into this machine-independent code. If it
502 * becomes important then this function should break out into
503 * a per-file stat function in the corresponding .c file.
508 vap->va_uid = procp->p_ucred->cr_uid;
509 vap->va_gid = procp->p_ucred->cr_gid;
512 switch (pfs->pfs_type) {
515 * Set nlink to 1 to tell fts(3) we don't actually know.
520 vap->va_size = vap->va_bytes = DEV_BSIZE;
524 char buf[16]; /* should be enough */
527 vap->va_size = vap->va_bytes =
528 snprintf(buf, sizeof(buf), "%ld", (long)curproc->p_pid);
533 vap->va_nlink = nproc_targets;
534 vap->va_size = vap->va_bytes = DEV_BSIZE;
538 char *fullpath, *freepath;
539 error = textvp_fullpath(procp, &fullpath, &freepath);
541 vap->va_size = strlen(fullpath);
542 free(freepath, M_TEMP);
544 vap->va_size = sizeof("unknown") - 1;
547 vap->va_bytes = vap->va_size;
553 * If we denied owner access earlier, then we have to
554 * change the owner to root - otherwise 'ps' and friends
555 * will break even though they are setgid kmem. *SIGH*
557 if (procp->p_flag & P_SUGID)
560 vap->va_uid = procp->p_ucred->cr_uid;
564 vap->va_bytes = vap->va_size = sizeof(struct reg);
568 vap->va_bytes = vap->va_size = sizeof(struct fpreg);
572 vap->va_bytes = vap->va_size = sizeof(struct dbreg);
586 panic("procfs_getattr");
594 struct vop_setattr_args /* {
597 struct ucred *a_cred;
602 if (ap->a_vap->va_flags != VNOVAL)
606 * just fake out attribute setting
607 * it's not good to generate an error
608 * return, otherwise things like creat()
609 * will fail when they try to set the
610 * file length to 0. worse, this means
611 * that echo $note > /proc/$pid/note will fail.
618 * implement access checking.
620 * something very similar to this code is duplicated
621 * throughout the 4bsd kernel and should be moved
622 * into kern/vfs_subr.c sometime.
624 * actually, the check for super-user is slightly
625 * broken since it will allow read access to write-only
626 * objects. this doesn't cause any particular trouble
627 * but does mean that the i/o entry points need to check
628 * that the operation really does make sense.
632 struct vop_access_args /* {
635 struct ucred *a_cred;
644 * If you're the super-user,
645 * you always get access.
647 if (ap->a_cred->cr_uid == 0)
651 error = VOP_GETATTR(ap->a_vp, vap, ap->a_cred, ap->a_p);
656 * Access check is based on only one of owner, group, public.
657 * If not owner, then check group. If not a member of the
658 * group, then check public access.
660 if (ap->a_cred->cr_uid != vap->va_uid) {
665 gp = ap->a_cred->cr_groups;
666 for (i = 0; i < ap->a_cred->cr_ngroups; i++, gp++)
667 if (vap->va_gid == *gp)
674 if ((vap->va_mode & ap->a_mode) == ap->a_mode)
681 * lookup. this is incredibly complicated in the
682 * general case, however for most pseudo-filesystems
683 * very little needs to be done.
685 * unless you want to get a migraine, just make sure your
686 * filesystem doesn't do any locking of its own. otherwise
687 * read and inwardly digest ufs_lookup().
691 struct vop_lookup_args /* {
692 struct vnode * a_dvp;
693 struct vnode ** a_vpp;
694 struct componentname * a_cnp;
697 struct componentname *cnp = ap->a_cnp;
698 struct vnode **vpp = ap->a_vpp;
699 struct vnode *dvp = ap->a_dvp;
700 char *pname = cnp->cn_nameptr;
701 /* struct proc *curp = cnp->cn_proc; */
702 struct proc_target *pt;
710 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)
713 if (cnp->cn_namelen == 1 && *pname == '.') {
716 /* vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, curp); */
721 switch (pfs->pfs_type) {
723 if (cnp->cn_flags & ISDOTDOT)
726 if (CNEQ(cnp, "curproc", 7))
727 return (procfs_allocvp(dvp->v_mount, vpp, 0, Pcurproc));
729 pid = atopid(pname, cnp->cn_namelen);
737 return (procfs_allocvp(dvp->v_mount, vpp, pid, Pproc));
740 if (cnp->cn_flags & ISDOTDOT)
741 return (procfs_root(dvp->v_mount, vpp));
743 p = PFIND(pfs->pfs_pid);
747 for (pt = proc_targets, i = 0; i < nproc_targets; pt++, i++) {
748 if (cnp->cn_namelen == pt->pt_namlen &&
749 bcmp(pt->pt_name, pname, cnp->cn_namelen) == 0 &&
750 (pt->pt_valid == NULL || (*pt->pt_valid)(p)))
755 return (procfs_allocvp(dvp->v_mount, vpp, pfs->pfs_pid,
762 return (cnp->cn_nameiop == LOOKUP ? ENOENT : EROFS);
766 * Does this process have a text file?
773 return (procfs_findtextvp(p) != NULLVP);
777 * readdir() returns directory entries from pfsnode (vp).
779 * We generate just one directory entry at a time, as it would probably
780 * not pay off to buffer several entries locally to save uiomove calls.
784 struct vop_readdir_args /* {
787 struct ucred *a_cred;
793 struct uio *uio = ap->a_uio;
795 struct dirent *dp = &d;
797 int count, error, i, off;
802 d.d_namlen = PROCFS_NAMELEN;
803 delen = GENERIC_DIRSIZ(&d);
806 pfs = VTOPFS(ap->a_vp);
808 off = (int)uio->uio_offset;
809 if (off != uio->uio_offset || off < 0 ||
810 off % delen != 0 || uio->uio_resid < delen)
817 switch (pfs->pfs_type) {
819 * this is for the process-specific sub-directories.
820 * all that is needed to is copy out all the entries
821 * from the procent[] table (top of this file).
825 struct proc_target *pt;
827 p = PFIND(pfs->pfs_pid);
830 if (!PRISON_CHECK(curproc, p))
833 for (pt = &proc_targets[i];
834 uio->uio_resid >= delen && i < nproc_targets; pt++, i++) {
835 if (pt->pt_valid && (*pt->pt_valid)(p) == 0)
838 dp->d_reclen = delen;
839 dp->d_fileno = PROCFS_FILENO(pfs->pfs_pid, pt->pt_pfstype);
840 dp->d_namlen = pt->pt_namlen;
841 bcopy(pt->pt_name, dp->d_name, pt->pt_namlen + 1);
842 dp->d_type = pt->pt_type;
844 if ((error = uiomove((caddr_t)dp, delen, uio)) != 0)
852 * this is for the root of the procfs filesystem
853 * what is needed is a special entry for "curproc"
854 * followed by an entry for each process on allproc
865 volatile struct proc *p = allproc.lh_first;
867 for (; p && uio->uio_resid >= delen; i++, pcnt++) {
868 bzero((char *) dp, delen);
869 dp->d_reclen = delen;
874 dp->d_fileno = PROCFS_FILENO(0, Proot);
875 dp->d_namlen = i + 1;
876 bcopy("..", dp->d_name, dp->d_namlen);
877 dp->d_name[i + 1] = '\0';
882 dp->d_fileno = PROCFS_FILENO(0, Pcurproc);
884 bcopy("curproc", dp->d_name, 8);
890 p = p->p_list.le_next;
893 if (!PRISON_CHECK(curproc, p))
897 while (!PRISON_CHECK(curproc, p)) {
898 p = p->p_list.le_next;
902 dp->d_fileno = PROCFS_FILENO(p->p_pid, Pproc);
903 dp->d_namlen = sprintf(dp->d_name, "%ld",
906 p = p->p_list.le_next;
910 if ((error = uiomove((caddr_t)dp, delen, uio)) != 0)
916 if (p == NULL && doingzomb == 0) {
918 p = zombproc.lh_first;
932 uio->uio_offset = i * delen;
938 * readlink reads the link of `curproc' or `file'
942 struct vop_readlink_args *ap;
944 char buf[16]; /* should be enough */
946 struct vnode *vp = ap->a_vp;
947 struct pfsnode *pfs = VTOPFS(vp);
948 char *fullpath, *freepath;
951 switch (pfs->pfs_type) {
953 if (pfs->pfs_fileno != PROCFS_FILENO(0, Pcurproc))
956 len = snprintf(buf, sizeof(buf), "%ld", (long)curproc->p_pid);
958 return (uiomove(buf, len, ap->a_uio));
960 * There _should_ be no way for an entire process to disappear
964 procp = PFIND(pfs->pfs_pid);
965 if (procp == NULL || procp->p_cred == NULL ||
966 procp->p_ucred == NULL) {
967 printf("procfs_readlink: pid %d disappeared\n",
969 return (uiomove("unknown", sizeof("unknown") - 1,
972 error = textvp_fullpath(procp, &fullpath, &freepath);
974 return (uiomove("unknown", sizeof("unknown") - 1,
976 error = uiomove(fullpath, strlen(fullpath), ap->a_uio);
977 free(freepath, M_TEMP);
985 * convert decimal ascii to pid_t
996 if (c < '0' || c > '9')
998 p = 10 * p + (c - '0');
1007 * procfs vnode operations.
1009 vop_t **procfs_vnodeop_p;
1010 static struct vnodeopv_entry_desc procfs_vnodeop_entries[] = {
1011 { &vop_default_desc, (vop_t *) vop_defaultop },
1012 { &vop_access_desc, (vop_t *) procfs_access },
1013 { &vop_advlock_desc, (vop_t *) procfs_badop },
1014 { &vop_bmap_desc, (vop_t *) procfs_bmap },
1015 { &vop_close_desc, (vop_t *) procfs_close },
1016 { &vop_create_desc, (vop_t *) procfs_badop },
1017 { &vop_getattr_desc, (vop_t *) procfs_getattr },
1018 { &vop_inactive_desc, (vop_t *) procfs_inactive },
1019 { &vop_link_desc, (vop_t *) procfs_badop },
1020 { &vop_lookup_desc, (vop_t *) procfs_lookup },
1021 { &vop_mkdir_desc, (vop_t *) procfs_badop },
1022 { &vop_mknod_desc, (vop_t *) procfs_badop },
1023 { &vop_open_desc, (vop_t *) procfs_open },
1024 { &vop_pathconf_desc, (vop_t *) vop_stdpathconf },
1025 { &vop_print_desc, (vop_t *) procfs_print },
1026 { &vop_read_desc, (vop_t *) procfs_rw },
1027 { &vop_readdir_desc, (vop_t *) procfs_readdir },
1028 { &vop_readlink_desc, (vop_t *) procfs_readlink },
1029 { &vop_reclaim_desc, (vop_t *) procfs_reclaim },
1030 { &vop_remove_desc, (vop_t *) procfs_badop },
1031 { &vop_rename_desc, (vop_t *) procfs_badop },
1032 { &vop_rmdir_desc, (vop_t *) procfs_badop },
1033 { &vop_setattr_desc, (vop_t *) procfs_setattr },
1034 { &vop_symlink_desc, (vop_t *) procfs_badop },
1035 { &vop_write_desc, (vop_t *) procfs_rw },
1036 { &vop_ioctl_desc, (vop_t *) procfs_ioctl },
1039 static struct vnodeopv_desc procfs_vnodeop_opv_desc =
1040 { &procfs_vnodeop_p, procfs_vnodeop_entries };
1042 VNODEOP_SET(procfs_vnodeop_opv_desc);