Annotation of src/sys/kern/kern_ktrace.c, Revision 1.90
1.90 ! christos 1: /* $NetBSD: kern_ktrace.c,v 1.89 2004/04/30 07:51:59 enami Exp $ */
1.11 cgd 2:
1.1 cgd 3: /*
1.9 cgd 4: * Copyright (c) 1989, 1993
5: * The Regents of the University of California. All rights reserved.
1.1 cgd 6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
1.77 agc 15: * 3. Neither the name of the University nor the names of its contributors
1.1 cgd 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: *
1.25 fvdl 31: * @(#)kern_ktrace.c 8.5 (Berkeley) 5/14/95
1.1 cgd 32: */
1.55 lukem 33:
34: #include <sys/cdefs.h>
1.90 ! christos 35: __KERNEL_RCSID(0, "$NetBSD: kern_ktrace.c,v 1.89 2004/04/30 07:51:59 enami Exp $");
1.29 thorpej 36:
37: #include "opt_ktrace.h"
1.62 manu 38: #include "opt_compat_mach.h"
1.1 cgd 39:
1.7 mycroft 40: #include <sys/param.h>
1.13 cgd 41: #include <sys/systm.h>
1.7 mycroft 42: #include <sys/proc.h>
43: #include <sys/file.h>
44: #include <sys/namei.h>
45: #include <sys/vnode.h>
46: #include <sys/ktrace.h>
47: #include <sys/malloc.h>
48: #include <sys/syslog.h>
1.28 christos 49: #include <sys/filedesc.h>
1.42 sommerfe 50: #include <sys/ioctl.h>
1.1 cgd 51:
1.13 cgd 52: #include <sys/mount.h>
1.67 thorpej 53: #include <sys/sa.h>
1.13 cgd 54: #include <sys/syscallargs.h>
1.22 christos 55:
1.51 jdolecek 56: #ifdef KTRACE
57:
1.87 enami 58: void ktrinitheader(struct ktr_header *, struct proc *, int);
59: int ktrwrite(struct proc *, struct ktr_header *);
1.74 fvdl 60: int ktrace_common(struct proc *, int, int, int, struct file *);
61: int ktrops(struct proc *, struct proc *, int, int, struct file *);
62: int ktrsetchildren(struct proc *, struct proc *, int, int,
1.47 thorpej 63: struct file *);
64: int ktrcanset(struct proc *, struct proc *);
65: int ktrsamefile(struct file *, struct file *);
1.44 sommerfe 66:
67: /*
68: * "deep" compare of two files for the purposes of clearing a trace.
69: * Returns true if they're the same open file, or if they point at the
70: * same underlying vnode/socket.
71: */
72:
73: int
1.89 enami 74: ktrsamefile(struct file *f1, struct file *f2)
1.44 sommerfe 75: {
1.88 enami 76:
1.44 sommerfe 77: return ((f1 == f2) ||
1.45 sommerfe 78: ((f1 != NULL) && (f2 != NULL) &&
79: (f1->f_type == f2->f_type) &&
1.44 sommerfe 80: (f1->f_data == f2->f_data)));
81: }
1.22 christos 82:
1.28 christos 83: void
1.89 enami 84: ktrderef(struct proc *p)
1.28 christos 85: {
1.42 sommerfe 86: struct file *fp = p->p_tracep;
87: p->p_traceflag = 0;
88: if (fp == NULL)
1.28 christos 89: return;
1.84 dsl 90: p->p_tracep = NULL;
91:
1.68 pk 92: simple_lock(&fp->f_slock);
1.42 sommerfe 93: FILE_USE(fp);
1.59 jdolecek 94:
95: /*
96: * ktrace file descriptor can't be watched (are not visible to
97: * userspace), so no kqueue stuff here
98: */
1.42 sommerfe 99: closef(fp, NULL);
1.28 christos 100: }
101:
102: void
1.89 enami 103: ktradref(struct proc *p)
1.28 christos 104: {
1.42 sommerfe 105: struct file *fp = p->p_tracep;
1.28 christos 106:
1.42 sommerfe 107: fp->f_count++;
1.28 christos 108: }
109:
1.39 thorpej 110: void
1.89 enami 111: ktrinitheader(struct ktr_header *kth, struct proc *p, int type)
1.1 cgd 112: {
113:
1.90 ! christos 114: (void)memset(kth, 0, sizeof(*kth));
1.1 cgd 115: kth->ktr_type = type;
116: microtime(&kth->ktr_time);
117: kth->ktr_pid = p->p_pid;
1.32 perry 118: memcpy(kth->ktr_comm, p->p_comm, MAXCOMLEN);
1.1 cgd 119: }
120:
1.90 ! christos 121: int
1.89 enami 122: ktrsyscall(struct proc *p, register_t code, register_t realcode,
123: const struct sysent *callp, register_t args[])
1.1 cgd 124: {
1.74 fvdl 125: struct ktr_header kth;
1.72 darrenr 126: struct ktr_syscall *ktp;
1.17 cgd 127: register_t *argp;
1.90 ! christos 128: int argsize, error;
1.57 fvdl 129: size_t len;
1.60 thorpej 130: u_int i;
1.57 fvdl 131:
1.66 manu 132: if (callp == NULL)
133: callp = p->p_emul->e_sysent;
1.88 enami 134:
1.76 drochner 135: argsize = callp[code].sy_argsize;
1.86 mrg 136: #ifdef _LP64
137: if (p->p_flag & P_32)
138: argsize = argsize << 1;
139: #endif
1.57 fvdl 140: len = sizeof(struct ktr_syscall) + argsize;
1.1 cgd 141:
1.9 cgd 142: p->p_traceflag |= KTRFAC_ACTIVE;
1.74 fvdl 143: ktrinitheader(&kth, p, KTR_SYSCALL);
1.39 thorpej 144: ktp = malloc(len, M_TEMP, M_WAITOK);
1.61 manu 145: ktp->ktr_code = realcode;
1.17 cgd 146: ktp->ktr_argsize = argsize;
147: argp = (register_t *)((char *)ktp + sizeof(struct ktr_syscall));
1.31 perry 148: for (i = 0; i < (argsize / sizeof(*argp)); i++)
1.1 cgd 149: *argp++ = args[i];
1.39 thorpej 150: kth.ktr_buf = (caddr_t)ktp;
151: kth.ktr_len = len;
1.90 ! christos 152: error = ktrwrite(p, &kth);
1.39 thorpej 153: free(ktp, M_TEMP);
1.9 cgd 154: p->p_traceflag &= ~KTRFAC_ACTIVE;
1.90 ! christos 155: return error;
1.1 cgd 156: }
157:
1.90 ! christos 158: int
1.89 enami 159: ktrsysret(struct proc *p, register_t code, int error, register_t *retval)
1.1 cgd 160: {
1.39 thorpej 161: struct ktr_header kth;
1.1 cgd 162: struct ktr_sysret ktp;
163:
1.9 cgd 164: p->p_traceflag |= KTRFAC_ACTIVE;
1.74 fvdl 165: ktrinitheader(&kth, p, KTR_SYSRET);
1.1 cgd 166: ktp.ktr_code = code;
1.34 kleink 167: ktp.ktr_eosys = 0; /* XXX unused */
1.1 cgd 168: ktp.ktr_error = error;
1.71 dsl 169: ktp.ktr_retval = retval ? retval[0] : 0;
170: ktp.ktr_retval_1 = retval ? retval[1] : 0;
1.1 cgd 171:
1.39 thorpej 172: kth.ktr_buf = (caddr_t)&ktp;
173: kth.ktr_len = sizeof(struct ktr_sysret);
1.1 cgd 174:
1.90 ! christos 175: error = ktrwrite(p, &kth);
1.9 cgd 176: p->p_traceflag &= ~KTRFAC_ACTIVE;
1.90 ! christos 177: return error;
1.1 cgd 178: }
179:
1.90 ! christos 180: int
1.89 enami 181: ktrnamei(struct proc *p, char *path)
1.1 cgd 182: {
1.39 thorpej 183: struct ktr_header kth;
1.90 ! christos 184: int error;
1.1 cgd 185:
1.9 cgd 186: p->p_traceflag |= KTRFAC_ACTIVE;
1.74 fvdl 187: ktrinitheader(&kth, p, KTR_NAMEI);
1.39 thorpej 188: kth.ktr_len = strlen(path);
189: kth.ktr_buf = path;
1.18 christos 190:
1.90 ! christos 191: error = ktrwrite(p, &kth);
1.18 christos 192: p->p_traceflag &= ~KTRFAC_ACTIVE;
1.90 ! christos 193: return error;
1.18 christos 194: }
195:
1.90 ! christos 196: int
1.89 enami 197: ktremul(struct proc *p)
1.18 christos 198: {
1.39 thorpej 199: struct ktr_header kth;
1.74 fvdl 200: const char *emul = p->p_emul->e_name;
1.90 ! christos 201: int error;
1.18 christos 202:
203: p->p_traceflag |= KTRFAC_ACTIVE;
1.74 fvdl 204: ktrinitheader(&kth, p, KTR_EMUL);
1.39 thorpej 205: kth.ktr_len = strlen(emul);
1.50 scw 206: kth.ktr_buf = (caddr_t)emul;
1.1 cgd 207:
1.90 ! christos 208: error = ktrwrite(p, &kth);
1.9 cgd 209: p->p_traceflag &= ~KTRFAC_ACTIVE;
1.90 ! christos 210: return error;
1.1 cgd 211: }
212:
1.90 ! christos 213: int
1.75 dsl 214: ktrkmem(struct proc *p, int ktr, const void *buf, size_t len)
215: {
216: struct ktr_header kth;
1.90 ! christos 217: int error;
1.75 dsl 218:
219: p->p_traceflag |= KTRFAC_ACTIVE;
220: ktrinitheader(&kth, p, ktr);
221: kth.ktr_len = len;
222: kth.ktr_buf = buf;
223:
1.90 ! christos 224: error = ktrwrite(p, &kth);
1.75 dsl 225: p->p_traceflag &= ~KTRFAC_ACTIVE;
1.90 ! christos 226: return error;
1.75 dsl 227: }
228:
1.90 ! christos 229: int
1.89 enami 230: ktrgenio(struct proc *p, int fd, enum uio_rw rw, struct iovec *iov,
231: int len, int error)
1.1 cgd 232: {
1.39 thorpej 233: struct ktr_header kth;
1.28 christos 234: struct ktr_genio *ktp;
1.74 fvdl 235: caddr_t cp;
1.72 darrenr 236: int resid = len, cnt;
1.39 thorpej 237: int buflen;
238:
1.1 cgd 239: if (error)
1.90 ! christos 240: return error;
1.39 thorpej 241:
1.9 cgd 242: p->p_traceflag |= KTRFAC_ACTIVE;
1.39 thorpej 243:
244: buflen = min(PAGE_SIZE, len + sizeof(struct ktr_genio));
245:
1.74 fvdl 246: ktrinitheader(&kth, p, KTR_GENIO);
1.39 thorpej 247: ktp = malloc(buflen, M_TEMP, M_WAITOK);
1.1 cgd 248: ktp->ktr_fd = fd;
249: ktp->ktr_rw = rw;
1.39 thorpej 250:
251: kth.ktr_buf = (caddr_t)ktp;
252:
1.31 perry 253: cp = (caddr_t)((char *)ktp + sizeof(struct ktr_genio));
1.39 thorpej 254: buflen -= sizeof(struct ktr_genio);
255:
1.1 cgd 256: while (resid > 0) {
1.67 thorpej 257: #if 0 /* XXX NJWLWP */
1.46 thorpej 258: KDASSERT(p->p_cpu != NULL);
259: KDASSERT(p->p_cpu == curcpu());
1.67 thorpej 260: #endif
261: /* XXX NJWLWP */
262: if (curcpu()->ci_schedstate.spc_flags & SPCF_SHOULDYIELD)
263: preempt(1);
1.39 thorpej 264:
265: cnt = min(iov->iov_len, buflen);
266: if (cnt > resid)
1.1 cgd 267: cnt = resid;
1.90 ! christos 268: if ((error = copyin(iov->iov_base, cp, cnt)) != 0)
1.39 thorpej 269: break;
270:
271: kth.ktr_len = cnt + sizeof(struct ktr_genio);
272:
1.90 ! christos 273: error = ktrwrite(p, &kth);
! 274: if (__predict_false(error != 0))
1.39 thorpej 275: break;
276:
277: iov->iov_base = (caddr_t)iov->iov_base + cnt;
278: iov->iov_len -= cnt;
279:
280: if (iov->iov_len == 0)
281: iov++;
282:
1.1 cgd 283: resid -= cnt;
284: }
285:
1.39 thorpej 286: free(ktp, M_TEMP);
1.9 cgd 287: p->p_traceflag &= ~KTRFAC_ACTIVE;
1.90 ! christos 288: return error;
1.1 cgd 289: }
290:
1.90 ! christos 291: int
1.89 enami 292: ktrpsig(struct proc *p, int sig, sig_t action, const sigset_t *mask,
293: const ksiginfo_t *ksi)
1.1 cgd 294: {
1.90 ! christos 295: int error;
! 296:
1.39 thorpej 297: struct ktr_header kth;
1.78 christos 298: struct {
299: struct ktr_psig kp;
300: siginfo_t si;
301: } kbuf;
1.1 cgd 302:
1.9 cgd 303: p->p_traceflag |= KTRFAC_ACTIVE;
1.74 fvdl 304: ktrinitheader(&kth, p, KTR_PSIG);
1.78 christos 305: kbuf.kp.signo = (char)sig;
306: kbuf.kp.action = action;
307: kbuf.kp.mask = *mask;
308: kth.ktr_buf = (caddr_t)&kbuf;
309: if (ksi) {
1.80 thorpej 310: kbuf.kp.code = KSI_TRAPCODE(ksi);
1.78 christos 311: (void)memset(&kbuf.si, 0, sizeof(kbuf.si));
1.80 thorpej 312: kbuf.si._info = ksi->ksi_info;
1.78 christos 313: kth.ktr_len = sizeof(kbuf);
314: } else {
315: kbuf.kp.code = 0;
316: kth.ktr_len = sizeof(struct ktr_psig);
317: }
1.90 ! christos 318: error = ktrwrite(p, &kth);
1.9 cgd 319: p->p_traceflag &= ~KTRFAC_ACTIVE;
1.90 ! christos 320: return error;
1.9 cgd 321: }
322:
1.90 ! christos 323: int
1.89 enami 324: ktrcsw(struct proc *p, int out, int user)
1.9 cgd 325: {
1.39 thorpej 326: struct ktr_header kth;
327: struct ktr_csw kc;
1.90 ! christos 328: int error;
1.9 cgd 329:
330: p->p_traceflag |= KTRFAC_ACTIVE;
1.74 fvdl 331: ktrinitheader(&kth, p, KTR_CSW);
1.9 cgd 332: kc.out = out;
333: kc.user = user;
1.39 thorpej 334: kth.ktr_buf = (caddr_t)&kc;
335: kth.ktr_len = sizeof(struct ktr_csw);
1.9 cgd 336:
1.90 ! christos 337: error = ktrwrite(p, &kth);
1.9 cgd 338: p->p_traceflag &= ~KTRFAC_ACTIVE;
1.90 ! christos 339: return error;
1.1 cgd 340: }
341:
1.90 ! christos 342: int
1.89 enami 343: ktruser(struct proc *p, const char *id, void *addr, size_t len, int ustr)
1.51 jdolecek 344: {
345: struct ktr_header kth;
346: struct ktr_user *ktp;
347: caddr_t user_dta;
1.90 ! christos 348: int error;
1.51 jdolecek 349:
350: p->p_traceflag |= KTRFAC_ACTIVE;
1.74 fvdl 351: ktrinitheader(&kth, p, KTR_USER);
1.51 jdolecek 352: ktp = malloc(sizeof(struct ktr_user) + len, M_TEMP, M_WAITOK);
353: if (ustr) {
354: if (copyinstr(id, ktp->ktr_id, KTR_USER_MAXIDLEN, NULL) != 0)
355: ktp->ktr_id[0] = '\0';
356: } else
357: strncpy(ktp->ktr_id, id, KTR_USER_MAXIDLEN);
358: ktp->ktr_id[KTR_USER_MAXIDLEN-1] = '\0';
359:
360: user_dta = (caddr_t) ((char *)ktp + sizeof(struct ktr_user));
361: if (copyin(addr, (void *) user_dta, len) != 0)
362: len = 0;
363:
364: kth.ktr_buf = (void *)ktp;
365: kth.ktr_len = sizeof(struct ktr_user) + len;
1.90 ! christos 366: error = ktrwrite(p, &kth);
1.51 jdolecek 367:
368: free(ktp, M_TEMP);
369: p->p_traceflag &= ~KTRFAC_ACTIVE;
1.90 ! christos 370: return error;
1.51 jdolecek 371:
372: }
373:
1.90 ! christos 374: int
1.89 enami 375: ktrmmsg(struct proc *p, const void *msgh, size_t size)
1.62 manu 376: {
377: struct ktr_header kth;
378: struct ktr_mmsg *kp;
1.90 ! christos 379: int error;
1.88 enami 380:
1.62 manu 381: p->p_traceflag |= KTRFAC_ACTIVE;
1.74 fvdl 382: ktrinitheader(&kth, p, KTR_MMSG);
1.88 enami 383:
1.64 manu 384: kp = (struct ktr_mmsg *)msgh;
1.62 manu 385: kth.ktr_buf = (caddr_t)kp;
386: kth.ktr_len = size;
1.90 ! christos 387: error = ktrwrite(p, &kth);
1.62 manu 388: p->p_traceflag &= ~KTRFAC_ACTIVE;
1.90 ! christos 389: return error;
1.62 manu 390: }
1.83 manu 391:
1.90 ! christos 392: int
1.89 enami 393: ktrmool(struct proc *p, const void *kaddr, size_t size, const void *uaddr)
1.83 manu 394: {
395: struct ktr_header kth;
396: struct ktr_mool *kp;
397: struct ktr_mool *buf;
1.90 ! christos 398: int error;
1.83 manu 399:
400: p->p_traceflag |= KTRFAC_ACTIVE;
401: ktrinitheader(&kth, p, KTR_MOOL);
402:
403: kp = malloc(size + sizeof(*kp), M_TEMP, M_WAITOK);
404: kp->uaddr = uaddr;
405: kp->size = size;
406: buf = kp + 1; /* Skip uaddr and size */
1.90 ! christos 407: (void)memcpy(buf, kaddr, size);
1.88 enami 408:
1.83 manu 409: kth.ktr_buf = (caddr_t)kp;
410: kth.ktr_len = size + sizeof(*kp);
1.90 ! christos 411: error = ktrwrite(p, &kth);
1.83 manu 412: free(kp, M_TEMP);
413:
414: p->p_traceflag &= ~KTRFAC_ACTIVE;
1.90 ! christos 415: return error;
1.83 manu 416: }
417:
1.62 manu 418:
1.1 cgd 419: /* Interface and common routines */
420:
1.17 cgd 421: int
1.89 enami 422: ktrace_common(struct proc *curp, int ops, int facs, int pid, struct file *fp)
1.28 christos 423: {
1.74 fvdl 424: int ret = 0;
1.72 darrenr 425: int error = 0;
1.42 sommerfe 426: int one = 1;
427: int descend;
1.74 fvdl 428: struct proc *p;
429: struct pgrp *pg;
1.28 christos 430:
431: curp->p_traceflag |= KTRFAC_ACTIVE;
1.42 sommerfe 432: descend = ops & KTRFLAG_DESCEND;
433: facs = facs & ~((unsigned) KTRFAC_ROOT);
1.28 christos 434:
435: /*
436: * Clear all uses of the tracefile
437: */
438: if (KTROP(ops) == KTROP_CLEARFILE) {
1.37 thorpej 439: proclist_lock_read();
1.81 jdolecek 440: LIST_FOREACH(p, &allproc, p_list) {
1.44 sommerfe 441: if (ktrsamefile(p->p_tracep, fp)) {
1.28 christos 442: if (ktrcanset(curp, p))
443: ktrderef(p);
444: else
445: error = EPERM;
446: }
447: }
1.36 thorpej 448: proclist_unlock_read();
1.28 christos 449: goto done;
450: }
1.42 sommerfe 451:
452: /*
453: * Mark fp non-blocking, to avoid problems from possible deadlocks.
454: */
455:
1.43 sommerfe 456: if (fp != NULL) {
457: fp->f_flag |= FNONBLOCK;
1.74 fvdl 458: (*fp->f_ops->fo_ioctl)(fp, FIONBIO, (caddr_t)&one, curp);
1.43 sommerfe 459: }
1.88 enami 460:
1.28 christos 461: /*
462: * need something to (un)trace (XXX - why is this here?)
463: */
464: if (!facs) {
465: error = EINVAL;
466: goto done;
467: }
1.88 enami 468: /*
1.28 christos 469: * do it
470: */
1.42 sommerfe 471: if (pid < 0) {
1.28 christos 472: /*
473: * by process group
474: */
1.82 dsl 475: pg = pg_find(-pid, PFIND_UNLOCK_FAIL);
1.28 christos 476: if (pg == NULL) {
477: error = ESRCH;
478: goto done;
479: }
1.81 jdolecek 480: LIST_FOREACH(p, &pg->pg_members, p_pglist) {
1.28 christos 481: if (descend)
1.74 fvdl 482: ret |= ktrsetchildren(curp, p, ops, facs, fp);
1.88 enami 483: else
1.74 fvdl 484: ret |= ktrops(curp, p, ops, facs, fp);
1.39 thorpej 485: }
1.88 enami 486:
1.28 christos 487: } else {
488: /*
489: * by pid
490: */
1.82 dsl 491: p = p_find(pid, PFIND_UNLOCK_FAIL);
1.28 christos 492: if (p == NULL) {
493: error = ESRCH;
494: goto done;
495: }
496: if (descend)
1.74 fvdl 497: ret |= ktrsetchildren(curp, p, ops, facs, fp);
1.28 christos 498: else
1.74 fvdl 499: ret |= ktrops(curp, p, ops, facs, fp);
1.28 christos 500: }
1.82 dsl 501: proclist_unlock_read(); /* taken by p{g}_find */
1.28 christos 502: if (!ret)
503: error = EPERM;
504: done:
505: curp->p_traceflag &= ~KTRFAC_ACTIVE;
506: return (error);
507: }
508:
509: /*
510: * ktrace system call
511: */
512: /* ARGSUSED */
513: int
1.89 enami 514: sys_fktrace(struct lwp *l, void *v, register_t *retval)
1.42 sommerfe 515: {
516: struct sys_fktrace_args /* {
517: syscallarg(int) fd;
518: syscallarg(int) ops;
519: syscallarg(int) facs;
520: syscallarg(int) pid;
521: } */ *uap = v;
1.74 fvdl 522: struct proc *curp = l->l_proc;
1.42 sommerfe 523: struct file *fp = NULL;
1.74 fvdl 524: struct filedesc *fdp = curp->p_fd;
1.70 yamt 525: int error;
1.42 sommerfe 526:
1.54 thorpej 527: if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL)
528: return (EBADF);
529:
1.70 yamt 530: FILE_USE(fp);
531:
1.54 thorpej 532: if ((fp->f_flag & FWRITE) == 0)
1.70 yamt 533: error = EBADF;
534: else
1.74 fvdl 535: error = ktrace_common(curp, SCARG(uap, ops),
1.70 yamt 536: SCARG(uap, facs), SCARG(uap, pid), fp);
537:
1.74 fvdl 538: FILE_UNUSE(fp, curp);
1.42 sommerfe 539:
1.70 yamt 540: return error;
1.42 sommerfe 541: }
542:
543: /*
544: * ktrace system call
545: */
546: /* ARGSUSED */
547: int
1.89 enami 548: sys_ktrace(struct lwp *l, void *v, register_t *retval)
1.19 thorpej 549: {
1.28 christos 550: struct sys_ktrace_args /* {
1.24 mycroft 551: syscallarg(const char *) fname;
1.13 cgd 552: syscallarg(int) ops;
553: syscallarg(int) facs;
554: syscallarg(int) pid;
1.19 thorpej 555: } */ *uap = v;
1.67 thorpej 556: struct proc *curp = l->l_proc;
1.28 christos 557: struct vnode *vp = NULL;
1.42 sommerfe 558: struct file *fp = NULL;
1.74 fvdl 559: int fd;
1.42 sommerfe 560: int ops = SCARG(uap, ops);
1.74 fvdl 561: int error = 0;
1.72 darrenr 562: struct nameidata nd;
1.1 cgd 563:
1.42 sommerfe 564: ops = KTROP(ops) | (ops & KTRFLAG_DESCEND);
565:
1.9 cgd 566: curp->p_traceflag |= KTRFAC_ACTIVE;
1.69 christos 567: if ((ops & KTROP_CLEAR) == 0) {
1.1 cgd 568: /*
569: * an operation which requires a file argument.
570: */
1.13 cgd 571: NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, fname),
1.74 fvdl 572: curp);
1.22 christos 573: if ((error = vn_open(&nd, FREAD|FWRITE, 0)) != 0) {
1.9 cgd 574: curp->p_traceflag &= ~KTRFAC_ACTIVE;
1.1 cgd 575: return (error);
1.9 cgd 576: }
1.1 cgd 577: vp = nd.ni_vp;
1.25 fvdl 578: VOP_UNLOCK(vp, 0);
1.1 cgd 579: if (vp->v_type != VREG) {
1.74 fvdl 580: (void) vn_close(vp, FREAD|FWRITE, curp->p_ucred, curp);
1.9 cgd 581: curp->p_traceflag &= ~KTRFAC_ACTIVE;
1.1 cgd 582: return (EACCES);
583: }
584: /*
1.42 sommerfe 585: * XXX This uses up a file descriptor slot in the
586: * tracing process for the duration of this syscall.
587: * This is not expected to be a problem. If
588: * falloc(NULL, ...) DTRT we could skip that part, but
589: * that would require changing its interface to allow
590: * the caller to pass in a ucred..
591: *
1.88 enami 592: * This will FILE_USE the fp it returns, if any.
1.42 sommerfe 593: * Keep it in use until we return.
1.1 cgd 594: */
1.42 sommerfe 595: if ((error = falloc(curp, &fp, &fd)) != 0)
1.1 cgd 596: goto done;
1.88 enami 597:
1.42 sommerfe 598: fp->f_flag = FWRITE|FAPPEND;
599: fp->f_type = DTYPE_VNODE;
600: fp->f_ops = &vnops;
601: fp->f_data = (caddr_t)vp;
1.54 thorpej 602: FILE_SET_MATURE(fp);
1.42 sommerfe 603: vp = NULL;
604: }
1.74 fvdl 605: error = ktrace_common(curp, SCARG(uap, ops), SCARG(uap, facs),
1.42 sommerfe 606: SCARG(uap, pid), fp);
1.88 enami 607: done:
1.1 cgd 608: if (vp != NULL)
1.74 fvdl 609: (void) vn_close(vp, FWRITE, curp->p_ucred, curp);
1.42 sommerfe 610: if (fp != NULL) {
1.74 fvdl 611: FILE_UNUSE(fp, curp); /* release file */
612: fdrelease(curp, fd); /* release fd table slot */
1.42 sommerfe 613: }
1.1 cgd 614: return (error);
615: }
616:
1.4 andrew 617: int
1.89 enami 618: ktrops(struct proc *curp, struct proc *p, int ops, int facs,
619: struct file *fp)
1.1 cgd 620: {
621:
622: if (!ktrcanset(curp, p))
623: return (0);
1.28 christos 624: if (KTROP(ops) == KTROP_SET) {
1.88 enami 625: if (p->p_tracep != fp) {
1.1 cgd 626: /*
627: * if trace file already in use, relinquish
628: */
1.28 christos 629: ktrderef(p);
1.42 sommerfe 630: p->p_tracep = fp;
1.28 christos 631: ktradref(p);
1.1 cgd 632: }
633: p->p_traceflag |= facs;
634: if (curp->p_ucred->cr_uid == 0)
635: p->p_traceflag |= KTRFAC_ROOT;
1.88 enami 636: } else {
1.1 cgd 637: /* KTROP_CLEAR */
638: if (((p->p_traceflag &= ~facs) & KTRFAC_MASK) == 0) {
639: /* no more tracing */
1.28 christos 640: ktrderef(p);
1.1 cgd 641: }
642: }
1.21 christos 643:
644: /*
645: * Emit an emulation record, every time there is a ktrace
1.88 enami 646: * change/attach request.
1.21 christos 647: */
648: if (KTRPOINT(p, KTR_EMUL))
1.84 dsl 649: p->p_traceflag |= KTRFAC_TRC_EMUL;
1.49 martin 650: #ifdef __HAVE_SYSCALL_INTERN
1.48 mycroft 651: (*p->p_emul->e_syscall_intern)(p);
1.49 martin 652: #endif
1.1 cgd 653:
654: return (1);
655: }
656:
1.22 christos 657: int
1.89 enami 658: ktrsetchildren(struct proc *curp, struct proc *top, int ops, int facs,
659: struct file *fp)
1.1 cgd 660: {
1.28 christos 661: struct proc *p;
662: int ret = 0;
1.1 cgd 663:
664: p = top;
665: for (;;) {
1.74 fvdl 666: ret |= ktrops(curp, p, ops, facs, fp);
1.1 cgd 667: /*
668: * If this process has children, descend to them next,
669: * otherwise do any siblings, and if done with this level,
670: * follow back up the tree (but not past top).
671: */
1.82 dsl 672: if (LIST_FIRST(&p->p_children) != NULL) {
1.39 thorpej 673: p = LIST_FIRST(&p->p_children);
1.82 dsl 674: continue;
675: }
676: for (;;) {
1.1 cgd 677: if (p == top)
678: return (ret);
1.39 thorpej 679: if (LIST_NEXT(p, p_sibling) != NULL) {
680: p = LIST_NEXT(p, p_sibling);
1.1 cgd 681: break;
682: }
1.12 mycroft 683: p = p->p_pptr;
1.1 cgd 684: }
685: }
686: /*NOTREACHED*/
687: }
688:
1.39 thorpej 689: int
1.89 enami 690: ktrwrite(struct proc *p, struct ktr_header *kth)
1.1 cgd 691: {
1.74 fvdl 692: struct uio auio;
1.1 cgd 693: struct iovec aiov[2];
1.42 sommerfe 694: int error, tries;
1.74 fvdl 695: struct file *fp = p->p_tracep;
1.1 cgd 696:
1.42 sommerfe 697: if (fp == NULL)
698: return 0;
1.88 enami 699:
1.84 dsl 700: if (p->p_traceflag & KTRFAC_TRC_EMUL) {
701: /* Add emulation trace before first entry for this process */
702: p->p_traceflag &= ~KTRFAC_TRC_EMUL;
1.90 ! christos 703: if ((error = ktremul(p)) != 0)
! 704: return error;
1.84 dsl 705: }
706:
1.1 cgd 707: auio.uio_iov = &aiov[0];
708: auio.uio_offset = 0;
709: auio.uio_segflg = UIO_SYSSPACE;
710: auio.uio_rw = UIO_WRITE;
711: aiov[0].iov_base = (caddr_t)kth;
712: aiov[0].iov_len = sizeof(struct ktr_header);
713: auio.uio_resid = sizeof(struct ktr_header);
714: auio.uio_iovcnt = 1;
1.74 fvdl 715: auio.uio_procp = (struct proc *)0;
1.1 cgd 716: if (kth->ktr_len > 0) {
717: auio.uio_iovcnt++;
1.75 dsl 718: aiov[1].iov_base = (void *)kth->ktr_buf;
1.1 cgd 719: aiov[1].iov_len = kth->ktr_len;
720: auio.uio_resid += kth->ktr_len;
721: }
1.28 christos 722:
1.68 pk 723: simple_lock(&fp->f_slock);
1.42 sommerfe 724: FILE_USE(fp);
725:
726: tries = 0;
727: do {
1.30 thorpej 728: error = (*fp->f_ops->fo_write)(fp, &fp->f_offset, &auio,
729: fp->f_cred, FOF_UPDATE_OFFSET);
1.74 fvdl 730: tries++;
1.88 enami 731: if (error == EWOULDBLOCK)
732: preempt(1);
1.42 sommerfe 733: } while ((error == EWOULDBLOCK) && (tries < 3));
734: FILE_UNUSE(fp, NULL);
1.28 christos 735:
1.40 thorpej 736: if (__predict_true(error == 0))
1.39 thorpej 737: return (0);
1.1 cgd 738: /*
1.38 darrenr 739: * If error encountered, give up tracing on this vnode. Don't report
740: * EPIPE as this can easily happen with fktrace()/ktruss.
1.1 cgd 741: */
1.38 darrenr 742: if (error != EPIPE)
743: log(LOG_NOTICE,
744: "ktrace write failed, errno %d, tracing stopped\n",
745: error);
1.37 thorpej 746: proclist_lock_read();
1.81 jdolecek 747: LIST_FOREACH(p, &allproc, p_list) {
1.44 sommerfe 748: if (ktrsamefile(p->p_tracep, fp))
1.28 christos 749: ktrderef(p);
1.1 cgd 750: }
1.36 thorpej 751: proclist_unlock_read();
1.39 thorpej 752:
753: return (error);
1.1 cgd 754: }
755:
756: /*
757: * Return true if caller has permission to set the ktracing state
758: * of target. Essentially, the target can't possess any
759: * more permissions than the caller. KTRFAC_ROOT signifies that
1.88 enami 760: * root previously set the tracing status on the target process, and
1.1 cgd 761: * so, only root may further change it.
762: *
763: * TODO: check groups. use caller effective gid.
764: */
1.22 christos 765: int
1.89 enami 766: ktrcanset(struct proc *callp, struct proc *targetp)
1.1 cgd 767: {
1.28 christos 768: struct pcred *caller = callp->p_cred;
769: struct pcred *target = targetp->p_cred;
1.1 cgd 770:
771: if ((caller->pc_ucred->cr_uid == target->p_ruid &&
1.88 enami 772: target->p_ruid == target->p_svuid &&
773: caller->p_rgid == target->p_rgid && /* XXX */
774: target->p_rgid == target->p_svgid &&
775: (targetp->p_traceflag & KTRFAC_ROOT) == 0 &&
776: (targetp->p_flag & P_SUGID) == 0) ||
777: caller->pc_ucred->cr_uid == 0)
1.1 cgd 778: return (1);
779:
780: return (0);
781: }
1.47 thorpej 782: #endif /* KTRACE */
1.51 jdolecek 783:
784: /*
785: * Put user defined entry to ktrace records.
786: */
787: int
1.89 enami 788: sys_utrace(struct lwp *l, void *v, register_t *retval)
1.51 jdolecek 789: {
790: #ifdef KTRACE
791: struct sys_utrace_args /* {
1.52 jdolecek 792: syscallarg(const char *) label;
1.51 jdolecek 793: syscallarg(void *) addr;
794: syscallarg(size_t) len;
795: } */ *uap = v;
1.67 thorpej 796: struct proc *p = l->l_proc;
1.88 enami 797:
1.51 jdolecek 798: if (!KTRPOINT(p, KTR_USER))
799: return (0);
1.53 jdolecek 800:
801: if (SCARG(uap, len) > KTR_USER_MAXLEN)
802: return (EINVAL);
1.51 jdolecek 803:
1.74 fvdl 804: ktruser(p, SCARG(uap, label), SCARG(uap, addr), SCARG(uap, len), 1);
1.51 jdolecek 805:
806: return (0);
807: #else /* !KTRACE */
808: return ENOSYS;
809: #endif /* KTRACE */
810: }
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