kernel - Fix numerous procfs/ptrace issues (3)
[dragonfly.git] / sys / vfs / procfs / procfs_vnops.c
CommitLineData
984263bc
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1/*
2 * Copyright (c) 1993, 1995 Jan-Simon Pendry
3 * Copyright (c) 1993, 1995
4 * The Regents of the University of California. All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Jan-Simon Pendry.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
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.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 * @(#)procfs_vnops.c 8.18 (Berkeley) 5/21/95
38 *
39 * $FreeBSD: src/sys/miscfs/procfs/procfs_vnops.c,v 1.76.2.7 2002/01/22 17:22:59 nectar Exp $
40 */
41
42/*
43 * procfs vnode interface
44 */
45
46#include <sys/param.h>
47#include <sys/systm.h>
48#include <sys/time.h>
49#include <sys/kernel.h>
50#include <sys/lock.h>
51#include <sys/fcntl.h>
52#include <sys/proc.h>
895c1f85 53#include <sys/priv.h>
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54#include <sys/signalvar.h>
55#include <sys/vnode.h>
56#include <sys/uio.h>
57#include <sys/mount.h>
58#include <sys/namei.h>
59#include <sys/dirent.h>
60#include <sys/malloc.h>
527fddf7 61#include <sys/reg.h>
984263bc 62#include <vm/vm_zone.h>
1f2de5d4 63#include <vfs/procfs/procfs.h>
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64#include <sys/pioctl.h>
65
e193508c
MD
66#include <sys/spinlock2.h>
67
dcab9ef0
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68#include <machine/limits.h>
69
a6ee311a 70static int procfs_access (struct vop_access_args *);
66a1ddf5 71static int procfs_badop (struct vop_generic_args *);
a6ee311a
RG
72static int procfs_bmap (struct vop_bmap_args *);
73static int procfs_close (struct vop_close_args *);
74static int procfs_getattr (struct vop_getattr_args *);
75static int procfs_inactive (struct vop_inactive_args *);
76static int procfs_ioctl (struct vop_ioctl_args *);
e62afb5f 77static int procfs_lookup (struct vop_old_lookup_args *);
a6ee311a
RG
78static int procfs_open (struct vop_open_args *);
79static int procfs_print (struct vop_print_args *);
80static int procfs_readdir (struct vop_readdir_args *);
81static int procfs_readlink (struct vop_readlink_args *);
82static int procfs_reclaim (struct vop_reclaim_args *);
83static int procfs_setattr (struct vop_setattr_args *);
984263bc 84
dcab9ef0
JS
85static int procfs_readdir_proc(struct vop_readdir_args *);
86static int procfs_readdir_root(struct vop_readdir_args *);
87
984263bc 88/*
66a1ddf5
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89 * procfs vnode operations.
90 */
91struct vop_ops procfs_vnode_vops = {
92 .vop_default = vop_defaultop,
93 .vop_access = procfs_access,
94 .vop_advlock = (void *)procfs_badop,
95 .vop_bmap = procfs_bmap,
96 .vop_close = procfs_close,
97 .vop_old_create = (void *)procfs_badop,
98 .vop_getattr = procfs_getattr,
99 .vop_inactive = procfs_inactive,
100 .vop_old_link = (void *)procfs_badop,
101 .vop_old_lookup = procfs_lookup,
102 .vop_old_mkdir = (void *)procfs_badop,
103 .vop_old_mknod = (void *)procfs_badop,
104 .vop_open = procfs_open,
105 .vop_pathconf = vop_stdpathconf,
106 .vop_print = procfs_print,
107 .vop_read = procfs_rw,
108 .vop_readdir = procfs_readdir,
109 .vop_readlink = procfs_readlink,
110 .vop_reclaim = procfs_reclaim,
111 .vop_old_remove = (void *)procfs_badop,
112 .vop_old_rename = (void *)procfs_badop,
113 .vop_old_rmdir = (void *)procfs_badop,
114 .vop_setattr = procfs_setattr,
115 .vop_old_symlink = (void *)procfs_badop,
116 .vop_write = (void *)procfs_rw,
117 .vop_ioctl = procfs_ioctl
118};
119
120
121/*
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122 * This is a list of the valid names in the
123 * process-specific sub-directories. It is
124 * used in procfs_lookup and procfs_readdir
125 */
126static struct proc_target {
127 u_char pt_type;
128 u_char pt_namlen;
129 char *pt_name;
130 pfstype pt_pfstype;
c7e98b2f 131 int (*pt_valid) (struct lwp *p);
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MD
132} proc_targets[] = {
133#define N(s) sizeof(s)-1, s
134 /* name type validp */
135 { DT_DIR, N("."), Pproc, NULL },
136 { DT_DIR, N(".."), Proot, NULL },
137 { DT_REG, N("mem"), Pmem, NULL },
138 { DT_REG, N("regs"), Pregs, procfs_validregs },
139 { DT_REG, N("fpregs"), Pfpregs, procfs_validfpregs },
140 { DT_REG, N("dbregs"), Pdbregs, procfs_validdbregs },
141 { DT_REG, N("ctl"), Pctl, NULL },
142 { DT_REG, N("status"), Pstatus, NULL },
143 { DT_REG, N("note"), Pnote, NULL },
144 { DT_REG, N("notepg"), Pnotepg, NULL },
145 { DT_REG, N("map"), Pmap, procfs_validmap },
146 { DT_REG, N("etype"), Ptype, procfs_validtype },
147 { DT_REG, N("cmdline"), Pcmdline, NULL },
148 { DT_REG, N("rlimit"), Prlimit, NULL },
149 { DT_LNK, N("file"), Pfile, NULL },
150#undef N
151};
c157ff7a 152static const int nproc_targets = NELEM(proc_targets);
984263bc 153
a6ee311a 154static pid_t atopid (const char *, u_int);
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155
156/*
157 * set things up for doing i/o on
158 * the pfsnode (vp). (vp) is locked
159 * on entry, and should be left locked
160 * on exit.
161 *
162 * for procfs we don't need to do anything
163 * in particular for i/o. all that is done
164 * is to support exclusive open on process
165 * memory images.
ac424f9b 166 *
b478fdce
SW
167 * procfs_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
168 * struct file *a_fp)
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169 */
170static int
ac424f9b 171procfs_open(struct vop_open_args *ap)
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172{
173 struct pfsnode *pfs = VTOPFS(ap->a_vp);
174 struct proc *p1, *p2;
58c2553a 175 int error;
984263bc 176
198c0ff2 177 p2 = pfs_pfind(pfs->pfs_pid);
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178 if (p2 == NULL)
179 return (ENOENT);
58c2553a
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180 if (pfs->pfs_pid && !PRISON_CHECK(ap->a_cred, p2->p_ucred)) {
181 error = ENOENT;
182 goto done;
183 }
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184
185 switch (pfs->pfs_type) {
186 case Pmem:
187 if (((pfs->pfs_flags & FWRITE) && (ap->a_mode & O_EXCL)) ||
58c2553a
MD
188 ((pfs->pfs_flags & O_EXCL) && (ap->a_mode & FWRITE))) {
189 error = EBUSY;
190 goto done;
191 }
984263bc 192
87de5057 193 p1 = curproc;
dadab5e9 194 KKASSERT(p1);
984263bc 195 /* Can't trace a process that's currently exec'ing. */
4643740a 196 if ((p2->p_flags & P_INEXEC) != 0) {
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MD
197 error = EAGAIN;
198 goto done;
199 }
200 if (!CHECKIO(p1, p2) || p_trespass(ap->a_cred, p2->p_ucred)) {
201 error = EPERM;
202 goto done;
203 }
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204
205 if (ap->a_mode & FWRITE)
206 pfs->pfs_flags = ap->a_mode & (FWRITE|O_EXCL);
207
8ddc6004 208 break;
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209
210 default:
211 break;
212 }
58c2553a
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213 error = vop_stdopen(ap);
214done:
f44c73be 215 pfs_pdone(p2);
58c2553a 216 return error;
984263bc
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217}
218
219/*
220 * close the pfsnode (vp) after doing i/o.
221 * (vp) is not locked on entry or exit.
222 *
223 * nothing to do for procfs other than undo
224 * any exclusive open flag (see _open above).
ac424f9b 225 *
87de5057 226 * procfs_close(struct vnode *a_vp, int a_fflag, struct ucred *a_cred)
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227 */
228static int
ac424f9b 229procfs_close(struct vop_close_args *ap)
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230{
231 struct pfsnode *pfs = VTOPFS(ap->a_vp);
232 struct proc *p;
233
234 switch (pfs->pfs_type) {
235 case Pmem:
236 if ((ap->a_fflag & FWRITE) && (pfs->pfs_flags & O_EXCL))
237 pfs->pfs_flags &= ~(FWRITE|O_EXCL);
238 /*
3c37c940
MD
239 * v_opencount determines the last real close on the vnode.
240 *
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241 * If this is the last close, then it checks to see if
242 * the target process has PF_LINGER set in p_pfsflags,
243 * if this is *not* the case, then the process' stop flags
244 * are cleared, and the process is woken up. This is
245 * to help prevent the case where a process has been
246 * told to stop on an event, but then the requesting process
247 * has gone away or forgotten about it.
248 */
58c2553a 249 p = NULL;
3c37c940 250 if ((ap->a_vp->v_opencount < 2)
b2a6ad87
MD
251 && ((p = pfs_pfind(pfs->pfs_pid)) != NULL ||
252 (p = pfs_zpfind(pfs->pfs_pid)) != NULL)
984263bc 253 && !(p->p_pfsflags & PF_LINGER)) {
287a8577 254 spin_lock(&p->p_spin);
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MD
255 p->p_stops = 0;
256 p->p_step = 0;
287a8577 257 spin_unlock(&p->p_spin);
b2a6ad87 258 wakeup(&p->p_stype);
984263bc 259 }
f44c73be 260 pfs_pdone(p);
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261 break;
262 default:
263 break;
264 }
265
8ddc6004 266 return (vop_stdclose(ap));
984263bc
MD
267}
268
269/*
270 * do an ioctl operation on a pfsnode (vp).
271 * (vp) is not locked on entry or exit.
272 */
273static int
ac424f9b 274procfs_ioctl(struct vop_ioctl_args *ap)
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275{
276 struct pfsnode *pfs = VTOPFS(ap->a_vp);
dadab5e9
MD
277 struct proc *procp;
278 struct proc *p;
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279 int error;
280 int signo;
281 struct procfs_status *psp;
282 unsigned char flags;
283
aa7ecbbc 284 procp = pfs_pfind(pfs->pfs_pid);
dadab5e9 285 if (procp == NULL)
984263bc 286 return ENOTTY;
87de5057 287 p = curproc;
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MD
288 if (p == NULL) {
289 error = EINVAL;
290 goto done;
291 }
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MD
292
293 /* Can't trace a process that's currently exec'ing. */
4643740a 294 if ((procp->p_flags & P_INEXEC) != 0) {
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MD
295 error = EAGAIN;
296 goto done;
297 }
298 if (!CHECKIO(p, procp) || p_trespass(ap->a_cred, procp->p_ucred)) {
299 error = EPERM;
300 goto done;
301 }
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MD
302
303 switch (ap->a_command) {
304 case PIOCBIS:
86d81c56 305 spin_lock(&procp->p_spin);
984263bc 306 procp->p_stops |= *(unsigned int*)ap->a_data;
86d81c56 307 spin_unlock(&procp->p_spin);
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MD
308 break;
309 case PIOCBIC:
86d81c56 310 spin_lock(&procp->p_spin);
984263bc 311 procp->p_stops &= ~*(unsigned int*)ap->a_data;
86d81c56 312 spin_unlock(&procp->p_spin);
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MD
313 break;
314 case PIOCSFL:
315 /*
316 * NFLAGS is "non-suser_xxx flags" -- currently, only
317 * PFS_ISUGID ("ignore set u/g id");
318 */
319#define NFLAGS (PF_ISUGID)
320 flags = (unsigned char)*(unsigned int*)ap->a_data;
895c1f85 321 if (flags & NFLAGS && (error = priv_check_cred(ap->a_cred, PRIV_ROOT, 0)))
58c2553a 322 goto done;
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MD
323 procp->p_pfsflags = flags;
324 break;
325 case PIOCGFL:
326 *(unsigned int*)ap->a_data = (unsigned int)procp->p_pfsflags;
327 break;
328 case PIOCSTATUS:
e193508c
MD
329 /*
330 * NOTE: syscall entry deals with stopevents and may run without
331 * the MP lock.
332 */
984263bc 333 psp = (struct procfs_status *)ap->a_data;
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MD
334 psp->flags = procp->p_pfsflags;
335 psp->events = procp->p_stops;
287a8577 336 spin_lock(&procp->p_spin);
984263bc 337 if (procp->p_step) {
e193508c 338 psp->state = 0;
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MD
339 psp->why = procp->p_stype;
340 psp->val = procp->p_xstat;
287a8577 341 spin_unlock(&procp->p_spin);
984263bc 342 } else {
e193508c 343 psp->state = 1;
287a8577 344 spin_unlock(&procp->p_spin);
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MD
345 psp->why = 0; /* Not defined values */
346 psp->val = 0; /* Not defined values */
984263bc
MD
347 }
348 break;
349 case PIOCWAIT:
e193508c
MD
350 /*
351 * NOTE: syscall entry deals with stopevents and may run without
352 * the MP lock.
353 */
984263bc 354 psp = (struct procfs_status *)ap->a_data;
287a8577 355 spin_lock(&procp->p_spin);
e193508c
MD
356 while (procp->p_step == 0) {
357 tsleep_interlock(&procp->p_stype, PCATCH);
287a8577 358 spin_unlock(&procp->p_spin);
b2a6ad87
MD
359 if (procp->p_stops == 0) {
360 error = EINVAL;
361 goto done;
362 }
363 if (procp->p_flags & P_POSTEXIT) {
364 error = EINVAL;
365 goto done;
366 }
367 if (procp->p_flags & P_INEXEC) {
368 error = EAGAIN;
369 goto done;
370 }
371 error = tsleep(&procp->p_stype, PCATCH | PINTERLOCKED,
372 "piocwait", 0);
984263bc 373 if (error)
58c2553a 374 goto done;
287a8577 375 spin_lock(&procp->p_spin);
984263bc 376 }
287a8577 377 spin_unlock(&procp->p_spin);
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MD
378 psp->state = 1; /* It stopped */
379 psp->flags = procp->p_pfsflags;
380 psp->events = procp->p_stops;
381 psp->why = procp->p_stype; /* why it stopped */
382 psp->val = procp->p_xstat; /* any extra info */
383 break;
384 case PIOCCONT: /* Restart a proc */
e193508c
MD
385 /*
386 * NOTE: syscall entry deals with stopevents and may run without
387 * the MP lock. However, the caller is presumably interlocked
388 * by having waited.
389 */
58c2553a
MD
390 if (procp->p_step == 0) {
391 error = EINVAL; /* Can only start a stopped process */
392 goto done;
393 }
984263bc 394 if ((signo = *(int*)ap->a_data) != 0) {
58c2553a
MD
395 if (signo >= NSIG || signo <= 0) {
396 error = EINVAL;
397 goto done;
398 }
84204577 399 ksignal(procp, signo);
984263bc
MD
400 }
401 procp->p_step = 0;
402 wakeup(&procp->p_step);
403 break;
404 default:
58c2553a
MD
405 error = ENOTTY;
406 goto done;
984263bc 407 }
58c2553a
MD
408 error = 0;
409done:
f44c73be 410 pfs_pdone(procp);
984263bc
MD
411 return 0;
412}
413
414/*
415 * do block mapping for pfsnode (vp).
416 * since we don't use the buffer cache
417 * for procfs this function should never
418 * be called. in any case, it's not clear
419 * what part of the kernel ever makes use
420 * of this function. for sanity, this is the
421 * usual no-op bmap, although returning
422 * (EIO) would be a reasonable alternative.
ac424f9b 423 *
08daea96
MD
424 * XXX mmap assumes buffer cache operation
425 *
426 * procfs_bmap(struct vnode *a_vp, off_t a_loffset,
427 * off_t *a_doffsetp, int *a_runp, int *a_runb)
984263bc
MD
428 */
429static int
ac424f9b 430procfs_bmap(struct vop_bmap_args *ap)
984263bc 431{
54078292
MD
432 if (ap->a_doffsetp != NULL)
433 *ap->a_doffsetp = ap->a_loffset;
984263bc
MD
434 if (ap->a_runp != NULL)
435 *ap->a_runp = 0;
54078292
MD
436 if (ap->a_runb != NULL)
437 *ap->a_runb = 0;
984263bc
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438 return (0);
439}
440
441/*
442 * procfs_inactive is called when the pfsnode
443 * is vrele'd and the reference count goes
444 * to zero. (vp) will be on the vnode free
445 * list, so to get it back vget() must be
446 * used.
447 *
448 * (vp) is locked on entry, but must be unlocked on exit.
ac424f9b 449 *
b478fdce 450 * procfs_inactive(struct vnode *a_vp)
984263bc
MD
451 */
452static int
ac424f9b 453procfs_inactive(struct vop_inactive_args *ap)
984263bc 454{
e193508c 455 struct pfsnode *pfs = VTOPFS(ap->a_vp);
984263bc 456
e193508c
MD
457 if (pfs->pfs_pid & PFS_DEAD)
458 vrecycle(ap->a_vp);
984263bc
MD
459 return (0);
460}
461
462/*
463 * _reclaim is called when getnewvnode()
464 * wants to make use of an entry on the vnode
465 * free list. at this time the filesystem needs
466 * to free any private data and remove the node
467 * from any private lists.
ac424f9b
CP
468 *
469 * procfs_reclaim(struct vnode *a_vp)
984263bc
MD
470 */
471static int
ac424f9b 472procfs_reclaim(struct vop_reclaim_args *ap)
984263bc 473{
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MD
474 return (procfs_freevp(ap->a_vp));
475}
476
477/*
478 * _print is used for debugging.
479 * just print a readable description
480 * of (vp).
ac424f9b
CP
481 *
482 * procfs_print(struct vnode *a_vp)
984263bc
MD
483 */
484static int
ac424f9b 485procfs_print(struct vop_print_args *ap)
984263bc
MD
486{
487 struct pfsnode *pfs = VTOPFS(ap->a_vp);
488
086c1d7e 489 kprintf("tag VT_PROCFS, type %d, pid %ld, mode %x, flags %lx\n",
984263bc
MD
490 pfs->pfs_type, (long)pfs->pfs_pid, pfs->pfs_mode, pfs->pfs_flags);
491 return (0);
492}
493
494/*
495 * generic entry point for unsupported operations
496 */
497static int
66a1ddf5 498procfs_badop(struct vop_generic_args *ap)
984263bc 499{
984263bc
MD
500 return (EIO);
501}
502
503/*
504 * Invent attributes for pfsnode (vp) and store
505 * them in (vap).
506 * Directories lengths are returned as zero since
507 * any real length would require the genuine size
508 * to be computed, and nothing cares anyway.
509 *
510 * this is relatively minimal for procfs.
ac424f9b 511 *
b478fdce 512 * procfs_getattr(struct vnode *a_vp, struct vattr *a_vap)
984263bc
MD
513 */
514static int
ac424f9b 515procfs_getattr(struct vop_getattr_args *ap)
984263bc
MD
516{
517 struct pfsnode *pfs = VTOPFS(ap->a_vp);
518 struct vattr *vap = ap->a_vap;
519 struct proc *procp;
520 int error;
521
522 /*
523 * First make sure that the process and its credentials
524 * still exist.
525 */
526 switch (pfs->pfs_type) {
527 case Proot:
528 case Pcurproc:
58c2553a 529 procp = NULL;
984263bc 530 break;
984263bc 531 default:
198c0ff2 532 procp = pfs_pfind(pfs->pfs_pid);
58c2553a
MD
533 if (procp == NULL || procp->p_ucred == NULL) {
534 error = ENOENT;
535 goto done;
536 }
f44c73be 537 break;
984263bc
MD
538 }
539
540 error = 0;
541
542 /* start by zeroing out the attributes */
543 VATTR_NULL(vap);
544
545 /* next do all the common fields */
546 vap->va_type = ap->a_vp->v_type;
547 vap->va_mode = pfs->pfs_mode;
548 vap->va_fileid = pfs->pfs_fileno;
549 vap->va_flags = 0;
550 vap->va_blocksize = PAGE_SIZE;
551 vap->va_bytes = vap->va_size = 0;
552 vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0];
553
554 /*
555 * Make all times be current TOD.
556 * It would be possible to get the process start
557 * time from the p_stat structure, but there's
558 * no "file creation" time stamp anyway, and the
559 * p_stat structure is not addressible if u. gets
560 * swapped out for that process.
561 */
562 nanotime(&vap->va_ctime);
563 vap->va_atime = vap->va_mtime = vap->va_ctime;
564
565 /*
566 * If the process has exercised some setuid or setgid
567 * privilege, then rip away read/write permission so
568 * that only root can gain access.
569 */
570 switch (pfs->pfs_type) {
571 case Pctl:
572 case Pregs:
573 case Pfpregs:
574 case Pdbregs:
575 case Pmem:
f44c73be 576 if (procp->p_flags & P_SUGID) {
984263bc
MD
577 vap->va_mode &= ~((VREAD|VWRITE)|
578 ((VREAD|VWRITE)>>3)|
579 ((VREAD|VWRITE)>>6));
f44c73be 580 }
984263bc
MD
581 break;
582 default:
583 break;
584 }
585
586 /*
587 * now do the object specific fields
588 *
589 * The size could be set from struct reg, but it's hardly
590 * worth the trouble, and it puts some (potentially) machine
591 * dependent data into this machine-independent code. If it
592 * becomes important then this function should break out into
593 * a per-file stat function in the corresponding .c file.
594 */
595
596 vap->va_nlink = 1;
597 if (procp) {
f44c73be
MD
598 if (procp->p_ucred) {
599 vap->va_uid = procp->p_ucred->cr_uid;
600 vap->va_gid = procp->p_ucred->cr_gid;
601 } else {
602 vap->va_uid = -1;
603 vap->va_gid = -1;
604 }
984263bc
MD
605 }
606
607 switch (pfs->pfs_type) {
608 case Proot:
609 /*
610 * Set nlink to 1 to tell fts(3) we don't actually know.
611 */
612 vap->va_nlink = 1;
613 vap->va_uid = 0;
614 vap->va_gid = 0;
615 vap->va_size = vap->va_bytes = DEV_BSIZE;
616 break;
617
618 case Pcurproc: {
619 char buf[16]; /* should be enough */
f44c73be 620
984263bc
MD
621 vap->va_uid = 0;
622 vap->va_gid = 0;
f44c73be
MD
623 vap->va_size = ksnprintf(buf, sizeof(buf),
624 "%ld", (long)curproc->p_pid);
625 vap->va_bytes = vap->va_size;
984263bc
MD
626 break;
627 }
628
629 case Pproc:
630 vap->va_nlink = nproc_targets;
631 vap->va_size = vap->va_bytes = DEV_BSIZE;
632 break;
633
634 case Pfile: {
635 char *fullpath, *freepath;
f44c73be 636
07cdb1d2
MD
637 if (procp->p_textnch.ncp) {
638 struct nchandle nch;
639
640 cache_copy(&procp->p_textnch, &nch);
641 error = cache_fullpath(procp, &nch,
642 &fullpath, &freepath, 0);
643 cache_drop(&nch);
644 } else {
f44c73be 645 error = EINVAL;
07cdb1d2 646 }
f44c73be 647
984263bc
MD
648 if (error == 0) {
649 vap->va_size = strlen(fullpath);
efda3bd0 650 kfree(freepath, M_TEMP);
984263bc
MD
651 } else {
652 vap->va_size = sizeof("unknown") - 1;
653 error = 0;
654 }
655 vap->va_bytes = vap->va_size;
656 break;
657 }
658
659 case Pmem:
660 /*
661 * If we denied owner access earlier, then we have to
662 * change the owner to root - otherwise 'ps' and friends
663 * will break even though they are setgid kmem. *SIGH*
664 */
4643740a 665 if (procp->p_flags & P_SUGID)
984263bc 666 vap->va_uid = 0;
f44c73be 667 else if (procp->p_ucred)
984263bc 668 vap->va_uid = procp->p_ucred->cr_uid;
f44c73be
MD
669 else
670 vap->va_uid = -1;
984263bc
MD
671 break;
672
673 case Pregs:
674 vap->va_bytes = vap->va_size = sizeof(struct reg);
675 break;
676
677 case Pfpregs:
678 vap->va_bytes = vap->va_size = sizeof(struct fpreg);
679 break;
680
681 case Pdbregs:
682 vap->va_bytes = vap->va_size = sizeof(struct dbreg);
683 break;
684
685 case Ptype:
686 case Pmap:
687 case Pctl:
688 case Pstatus:
689 case Pnote:
690 case Pnotepg:
691 case Pcmdline:
692 case Prlimit:
693 break;
694
695 default:
696 panic("procfs_getattr");
697 }
58c2553a 698done:
f44c73be 699 pfs_pdone(procp);
984263bc
MD
700 return (error);
701}
702
ac424f9b
CP
703/*
704 * procfs_setattr(struct vnode *a_vp, struct vattr *a_vap,
b478fdce 705 * struct ucred *a_cred)
ac424f9b 706 */
984263bc 707static int
ac424f9b 708procfs_setattr(struct vop_setattr_args *ap)
984263bc 709{
984263bc
MD
710 if (ap->a_vap->va_flags != VNOVAL)
711 return (EOPNOTSUPP);
712
713 /*
714 * just fake out attribute setting
715 * it's not good to generate an error
716 * return, otherwise things like creat()
717 * will fail when they try to set the
718 * file length to 0. worse, this means
719 * that echo $note > /proc/$pid/note will fail.
720 */
721
722 return (0);
723}
724
725/*
726 * implement access checking.
727 *
b478fdce 728 * procfs_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred)
984263bc
MD
729 */
730static int
ac424f9b 731procfs_access(struct vop_access_args *ap)
984263bc 732{
984263bc
MD
733 struct vattr vattr;
734 int error;
735
52cdca9a
NT
736 error = VOP_GETATTR(ap->a_vp, &vattr);
737 if (!error)
738 error = vop_helper_access(ap, vattr.va_uid, vattr.va_gid,
739 vattr.va_mode, 0);
740 return (error);
984263bc
MD
741}
742
743/*
3446c007
MD
744 * lookup. this is incredibly complicated in the general case, however
745 * for most pseudo-filesystems very little needs to be done.
ac424f9b
CP
746 *
747 * procfs_lookup(struct vnode *a_dvp, struct vnode **a_vpp,
748 * struct componentname *a_cnp)
984263bc
MD
749 */
750static int
e62afb5f 751procfs_lookup(struct vop_old_lookup_args *ap)
984263bc
MD
752{
753 struct componentname *cnp = ap->a_cnp;
754 struct vnode **vpp = ap->a_vpp;
755 struct vnode *dvp = ap->a_dvp;
756 char *pname = cnp->cn_nameptr;
757 /* struct proc *curp = cnp->cn_proc; */
758 struct proc_target *pt;
759 pid_t pid;
760 struct pfsnode *pfs;
761 struct proc *p;
c7e98b2f 762 struct lwp *lp;
984263bc 763 int i;
3446c007 764 int error;
984263bc
MD
765
766 *vpp = NULL;
767
2b69e610 768 if (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME)
984263bc
MD
769 return (EROFS);
770
58c2553a 771 p = NULL;
3446c007 772 error = 0;
984263bc
MD
773 if (cnp->cn_namelen == 1 && *pname == '.') {
774 *vpp = dvp;
3446c007
MD
775 vref(*vpp);
776 goto out;
984263bc
MD
777 }
778
779 pfs = VTOPFS(dvp);
780 switch (pfs->pfs_type) {
781 case Proot:
2b69e610 782 if (cnp->cn_flags & CNP_ISDOTDOT)
984263bc
MD
783 return (EIO);
784
3446c007
MD
785 if (CNEQ(cnp, "curproc", 7)) {
786 error = procfs_allocvp(dvp->v_mount, vpp, 0, Pcurproc);
787 goto out;
788 }
984263bc
MD
789
790 pid = atopid(pname, cnp->cn_namelen);
791 if (pid == NO_PID)
792 break;
793
198c0ff2 794 p = pfs_pfind(pid);
984263bc
MD
795 if (p == NULL)
796 break;
797
dcab9ef0
JS
798 if (!PRISON_CHECK(ap->a_cnp->cn_cred, p->p_ucred))
799 break;
800
28c57d20
HP
801 if (ps_showallprocs == 0 && ap->a_cnp->cn_cred->cr_uid != 0 &&
802 ap->a_cnp->cn_cred->cr_uid != p->p_ucred->cr_uid)
803 break;
804
3446c007
MD
805 error = procfs_allocvp(dvp->v_mount, vpp, pid, Pproc);
806 goto out;
984263bc
MD
807
808 case Pproc:
3446c007
MD
809 if (cnp->cn_flags & CNP_ISDOTDOT) {
810 error = procfs_root(dvp->v_mount, vpp);
811 goto out;
812 }
984263bc 813
198c0ff2 814 p = pfs_pfind(pfs->pfs_pid);
984263bc
MD
815 if (p == NULL)
816 break;
c7e98b2f
SS
817 /* XXX lwp */
818 lp = FIRST_LWP_IN_PROC(p);
984263bc 819
dcab9ef0
JS
820 if (!PRISON_CHECK(ap->a_cnp->cn_cred, p->p_ucred))
821 break;
822
28c57d20
HP
823 if (ps_showallprocs == 0 && ap->a_cnp->cn_cred->cr_uid != 0 &&
824 ap->a_cnp->cn_cred->cr_uid != p->p_ucred->cr_uid)
825 break;
826
984263bc
MD
827 for (pt = proc_targets, i = 0; i < nproc_targets; pt++, i++) {
828 if (cnp->cn_namelen == pt->pt_namlen &&
829 bcmp(pt->pt_name, pname, cnp->cn_namelen) == 0 &&
c7e98b2f 830 (pt->pt_valid == NULL || (*pt->pt_valid)(lp)))
984263bc
MD
831 goto found;
832 }
833 break;
834 found:
3446c007
MD
835 error = procfs_allocvp(dvp->v_mount, vpp, pfs->pfs_pid,
836 pt->pt_pfstype);
837 goto out;
984263bc
MD
838
839 default:
3446c007
MD
840 error = ENOTDIR;
841 goto out;
984263bc 842 }
3446c007
MD
843 if (cnp->cn_nameiop == NAMEI_LOOKUP)
844 error = ENOENT;
845 else
846 error = EROFS;
847 /*
848 * If no error occured *vpp will hold a referenced locked vnode.
aa723195
MD
849 * dvp was passed to us locked and *vpp must be returned locked.
850 * If *vpp != dvp then we should unlock dvp if (1) this is not the
851 * last component or (2) CNP_LOCKPARENT is not set.
3446c007
MD
852 */
853out:
aa723195
MD
854 if (error == 0 && *vpp != dvp) {
855 if ((cnp->cn_flags & CNP_LOCKPARENT) == 0) {
856 cnp->cn_flags |= CNP_PDIRUNLOCK;
a11aaa81 857 vn_unlock(dvp);
3446c007
MD
858 }
859 }
f44c73be 860 pfs_pdone(p);
3446c007 861 return (error);
984263bc
MD
862}
863
864/*
865 * Does this process have a text file?
866 */
4d4fb029 867int
c7e98b2f 868procfs_validfile(struct lwp *lp)
984263bc 869{
c7e98b2f 870 return (procfs_findtextvp(lp->lwp_proc) != NULLVP);
984263bc
MD
871}
872
873/*
874 * readdir() returns directory entries from pfsnode (vp).
875 *
876 * We generate just one directory entry at a time, as it would probably
877 * not pay off to buffer several entries locally to save uiomove calls.
ac424f9b
CP
878 *
879 * procfs_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred,
84009d92 880 * int *a_eofflag, int *a_ncookies, off_t **a_cookies)
984263bc
MD
881 */
882static int
ac424f9b 883procfs_readdir(struct vop_readdir_args *ap)
984263bc 884{
984263bc 885 struct pfsnode *pfs;
dcab9ef0 886 int error;
984263bc 887
dcab9ef0 888 if (ap->a_uio->uio_offset < 0 || ap->a_uio->uio_offset > INT_MAX)
984263bc 889 return (EINVAL);
885ecb13
MD
890 if ((error = vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY)) != 0)
891 return (error);
dcab9ef0 892 pfs = VTOPFS(ap->a_vp);
984263bc
MD
893
894 switch (pfs->pfs_type) {
dcab9ef0 895 case Pproc:
885ecb13
MD
896 /*
897 * this is for the process-specific sub-directories.
898 * all that is needed to is copy out all the entries
899 * from the procent[] table (top of this file).
900 */
dcab9ef0
JS
901 error = procfs_readdir_proc(ap);
902 break;
dcab9ef0 903 case Proot:
885ecb13
MD
904 /*
905 * this is for the root of the procfs filesystem
906 * what is needed is a special entry for "curproc"
907 * followed by an entry for each process on allproc
908 */
dcab9ef0 909 error = procfs_readdir_root(ap);
984263bc 910 break;
984263bc
MD
911 default:
912 error = ENOTDIR;
913 break;
914 }
915
885ecb13 916 vn_unlock(ap->a_vp);
984263bc
MD
917 return (error);
918}
919
dcab9ef0
JS
920static int
921procfs_readdir_proc(struct vop_readdir_args *ap)
922{
923 struct pfsnode *pfs;
924 int error, i, retval;
925 struct proc *p;
c7e98b2f 926 struct lwp *lp;
dcab9ef0
JS
927 struct proc_target *pt;
928 struct uio *uio = ap->a_uio;
929
930 pfs = VTOPFS(ap->a_vp);
198c0ff2 931 p = pfs_pfind(pfs->pfs_pid);
dcab9ef0
JS
932 if (p == NULL)
933 return(0);
58c2553a
MD
934 if (!PRISON_CHECK(ap->a_cred, p->p_ucred)) {
935 error = 0;
936 goto done;
937 }
938 /* XXX lwp, not MPSAFE */
c7e98b2f 939 lp = FIRST_LWP_IN_PROC(p);
dcab9ef0
JS
940
941 error = 0;
fb0466c9 942 i = (int)uio->uio_offset;
58c2553a
MD
943 if (i < 0) {
944 error = EINVAL;
945 goto done;
946 }
dcab9ef0
JS
947
948 for (pt = &proc_targets[i];
949 !error && uio->uio_resid > 0 && i < nproc_targets; pt++, i++) {
c7e98b2f 950 if (pt->pt_valid && (*pt->pt_valid)(lp) == 0)
dcab9ef0
JS
951 continue;
952
953 retval = vop_write_dirent(&error, uio,
954 PROCFS_FILENO(pfs->pfs_pid, pt->pt_pfstype), pt->pt_type,
955 pt->pt_namlen, pt->pt_name);
956 if (retval)
957 break;
958 }
959
fb0466c9 960 uio->uio_offset = (off_t)i;
58c2553a
MD
961 error = 0;
962done:
f44c73be 963 pfs_pdone(p);
58c2553a 964 return error;
dcab9ef0
JS
965}
966
51e64ff2
MD
967struct procfs_readdir_root_info {
968 int error;
969 int i;
970 int pcnt;
971 struct uio *uio;
972 struct ucred *cred;
973};
974
975static int procfs_readdir_root_callback(struct proc *p, void *data);
976
dcab9ef0
JS
977static int
978procfs_readdir_root(struct vop_readdir_args *ap)
979{
51e64ff2 980 struct procfs_readdir_root_info info;
dcab9ef0 981 struct uio *uio = ap->a_uio;
51e64ff2
MD
982 int res;
983
984 info.error = 0;
fb0466c9
MD
985 info.i = (int)uio->uio_offset;
986
987 if (info.i < 0)
988 return (EINVAL);
989
51e64ff2
MD
990 info.pcnt = 0;
991 info.uio = uio;
992 info.cred = ap->a_cred;
51e64ff2
MD
993 while (info.pcnt < 3) {
994 res = procfs_readdir_root_callback(NULL, &info);
995 if (res < 0)
996 break;
997 }
998 if (res >= 0)
999 allproc_scan(procfs_readdir_root_callback, &info);
fb0466c9 1000 uio->uio_offset = (off_t)info.i;
51e64ff2
MD
1001
1002 return (info.error);
1003}
1004
1005static int
1006procfs_readdir_root_callback(struct proc *p, void *data)
1007{
1008 struct procfs_readdir_root_info *info = data;
1009 struct uio *uio;
1010 int retval;
dcab9ef0
JS
1011 ino_t d_ino;
1012 const char *d_name;
1013 char d_name_pid[20];
1014 size_t d_namlen;
1015 uint8_t d_type;
1016
51e64ff2 1017 uio = info->uio;
dcab9ef0 1018
51e64ff2
MD
1019 if (uio->uio_resid <= 0 || info->error)
1020 return(-1);
dcab9ef0 1021
51e64ff2
MD
1022 switch (info->pcnt) {
1023 case 0: /* `.' */
1024 d_ino = PROCFS_FILENO(0, Proot);
1025 d_name = ".";
1026 d_namlen = 1;
1027 d_type = DT_DIR;
1028 break;
1029 case 1: /* `..' */
1030 d_ino = PROCFS_FILENO(0, Proot);
1031 d_name = "..";
1032 d_namlen = 2;
1033 d_type = DT_DIR;
1034 break;
dcab9ef0 1035
51e64ff2
MD
1036 case 2:
1037 d_ino = PROCFS_FILENO(0, Pcurproc);
1038 d_namlen = 7;
1039 d_name = "curproc";
1040 d_type = DT_LNK;
1041 break;
dcab9ef0 1042
51e64ff2
MD
1043
1044 default:
1045 if (!PRISON_CHECK(info->cred, p->p_ucred))
1046 return(0);
1047 if (ps_showallprocs == 0 &&
1048 info->cred->cr_uid != 0 &&
1049 info->cred->cr_uid != p->p_ucred->cr_uid) {
1050 return(0);
dcab9ef0
JS
1051 }
1052
51e64ff2
MD
1053 /*
1054 * Skip entries we have already returned (optimization)
1055 */
1056 if (info->pcnt < info->i) {
1057 ++info->pcnt;
1058 return(0);
1059 }
1060
1061 d_ino = PROCFS_FILENO(p->p_pid, Pproc);
f8c7a42d 1062 d_namlen = ksnprintf(d_name_pid, sizeof(d_name_pid),
51e64ff2
MD
1063 "%ld", (long)p->p_pid);
1064 d_name = d_name_pid;
1065 d_type = DT_DIR;
1066 break;
dcab9ef0 1067 }
51e64ff2
MD
1068
1069 /*
1070 * Skip entries we have already returned (optimization)
1071 */
1072 if (info->pcnt < info->i) {
1073 ++info->pcnt;
1074 return(0);
1075 }
1076
1077 retval = vop_write_dirent(&info->error, uio,
1078 d_ino, d_type, d_namlen, d_name);
1079 if (retval)
1080 return(-1);
1081 ++info->pcnt;
1082 ++info->i;
dcab9ef0
JS
1083 return(0);
1084}
1085
984263bc
MD
1086/*
1087 * readlink reads the link of `curproc' or `file'
1088 */
1089static int
ac424f9b 1090procfs_readlink(struct vop_readlink_args *ap)
984263bc
MD
1091{
1092 char buf[16]; /* should be enough */
1093 struct proc *procp;
1094 struct vnode *vp = ap->a_vp;
1095 struct pfsnode *pfs = VTOPFS(vp);
1096 char *fullpath, *freepath;
1097 int error, len;
1098
1099 switch (pfs->pfs_type) {
1100 case Pcurproc:
1101 if (pfs->pfs_fileno != PROCFS_FILENO(0, Pcurproc))
1102 return (EINVAL);
1103
f8c7a42d 1104 len = ksnprintf(buf, sizeof(buf), "%ld", (long)curproc->p_pid);
984263bc
MD
1105
1106 return (uiomove(buf, len, ap->a_uio));
1107 /*
1108 * There _should_ be no way for an entire process to disappear
1109 * from under us...
1110 */
1111 case Pfile:
198c0ff2 1112 procp = pfs_pfind(pfs->pfs_pid);
41c20dac 1113 if (procp == NULL || procp->p_ucred == NULL) {
086c1d7e 1114 kprintf("procfs_readlink: pid %d disappeared\n",
984263bc 1115 pfs->pfs_pid);
f44c73be 1116 pfs_pdone(procp);
984263bc 1117 return (uiomove("unknown", sizeof("unknown") - 1,
f44c73be 1118 ap->a_uio));
984263bc 1119 }
07cdb1d2
MD
1120 if (procp->p_textnch.ncp) {
1121 struct nchandle nch;
1122
1123 cache_copy(&procp->p_textnch, &nch);
1124 error = cache_fullpath(procp, &nch,
f44c73be 1125 &fullpath, &freepath, 0);
07cdb1d2
MD
1126 cache_drop(&nch);
1127 } else {
f44c73be 1128 error = EINVAL;
07cdb1d2 1129 }
f44c73be 1130
58c2553a 1131 if (error != 0) {
f44c73be 1132 pfs_pdone(procp);
984263bc 1133 return (uiomove("unknown", sizeof("unknown") - 1,
f44c73be 1134 ap->a_uio));
58c2553a 1135 }
984263bc 1136 error = uiomove(fullpath, strlen(fullpath), ap->a_uio);
efda3bd0 1137 kfree(freepath, M_TEMP);
f44c73be 1138 pfs_pdone(procp);
984263bc
MD
1139 return (error);
1140 default:
1141 return (EINVAL);
1142 }
1143}
1144
1145/*
1146 * convert decimal ascii to pid_t
1147 */
1148static pid_t
ac424f9b 1149atopid(const char *b, u_int len)
984263bc
MD
1150{
1151 pid_t p = 0;
1152
1153 while (len--) {
1154 char c = *b++;
1155 if (c < '0' || c > '9')
1156 return (NO_PID);
1157 p = 10 * p + (c - '0');
1158 if (p > PID_MAX)
1159 return (NO_PID);
1160 }
1161
1162 return (p);
1163}
1164