1 /*
2 * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
3 * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
4 * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
5 * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
6 * Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
7 * Linux for s390 port by D.J. Barrow
8 * <barrow_dj@mail.yahoo.com,djbarrow@de.ibm.com>
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #include "defs.h"
35 #include <sys/param.h>
36
37 /* for struct iovec */
38 #include <sys/uio.h>
39
40 #include "regs.h"
41 #include "ptrace.h"
42
43 #if defined(SPARC64)
44 # undef PTRACE_GETREGS
45 # define PTRACE_GETREGS PTRACE_GETREGS64
46 # undef PTRACE_SETREGS
47 # define PTRACE_SETREGS PTRACE_SETREGS64
48 #endif
49
50 #if defined SPARC64
51 # include <asm/psrcompat.h>
52 #elif defined SPARC
53 # include <asm/psr.h>
54 #endif
55
56 #ifdef IA64
57 # include <asm/rse.h>
58 #endif
59
60 #ifndef NT_PRSTATUS
61 # define NT_PRSTATUS 1
62 #endif
63
64 #ifndef NSIG
65 # warning: NSIG is not defined, using 32
66 # define NSIG 32
67 #endif
68
69 #include "syscall.h"
70
71 /* Define these shorthand notations to simplify the syscallent files. */
72 #define TD TRACE_DESC
73 #define TF TRACE_FILE
74 #define TI TRACE_IPC
75 #define TN TRACE_NETWORK
76 #define TP TRACE_PROCESS
77 #define TS TRACE_SIGNAL
78 #define TM TRACE_MEMORY
79 #define NF SYSCALL_NEVER_FAILS
80 #define MA MAX_ARGS
81 #define SI STACKTRACE_INVALIDATE_CACHE
82 #define SE STACKTRACE_CAPTURE_ON_ENTER
83
84 const struct_sysent sysent0[] = {
85 #include "syscallent.h"
86 };
87
88 #if SUPPORTED_PERSONALITIES > 1
89 static const struct_sysent sysent1[] = {
90 # include "syscallent1.h"
91 };
92 #endif
93
94 #if SUPPORTED_PERSONALITIES > 2
95 static const struct_sysent sysent2[] = {
96 # include "syscallent2.h"
97 };
98 #endif
99
100 /* Now undef them since short defines cause wicked namespace pollution. */
101 #undef TD
102 #undef TF
103 #undef TI
104 #undef TN
105 #undef TP
106 #undef TS
107 #undef TM
108 #undef NF
109 #undef MA
110 #undef SI
111 #undef SE
112
113 /*
114 * `ioctlent[012].h' files are automatically generated by the auxiliary
115 * program `ioctlsort', such that the list is sorted by the `code' field.
116 * This has the side-effect of resolving the _IO.. macros into
117 * plain integers, eliminating the need to include here everything
118 * in "/usr/include".
119 */
120
121 const char *const errnoent0[] = {
122 #include "errnoent.h"
123 };
124 const char *const signalent0[] = {
125 #include "signalent.h"
126 };
127 const struct_ioctlent ioctlent0[] = {
128 #include "ioctlent0.h"
129 };
130
131 #if SUPPORTED_PERSONALITIES > 1
132 static const char *const errnoent1[] = {
133 # include "errnoent1.h"
134 };
135 static const char *const signalent1[] = {
136 # include "signalent1.h"
137 };
138 static const struct_ioctlent ioctlent1[] = {
139 # include "ioctlent1.h"
140 };
141 #endif
142
143 #if SUPPORTED_PERSONALITIES > 2
144 static const char *const errnoent2[] = {
145 # include "errnoent2.h"
146 };
147 static const char *const signalent2[] = {
148 # include "signalent2.h"
149 };
150 static const struct_ioctlent ioctlent2[] = {
151 # include "ioctlent2.h"
152 };
153 #endif
154
155 enum {
156 nsyscalls0 = ARRAY_SIZE(sysent0)
157 #if SUPPORTED_PERSONALITIES > 1
158 , nsyscalls1 = ARRAY_SIZE(sysent1)
159 # if SUPPORTED_PERSONALITIES > 2
160 , nsyscalls2 = ARRAY_SIZE(sysent2)
161 # endif
162 #endif
163 };
164
165 enum {
166 nerrnos0 = ARRAY_SIZE(errnoent0)
167 #if SUPPORTED_PERSONALITIES > 1
168 , nerrnos1 = ARRAY_SIZE(errnoent1)
169 # if SUPPORTED_PERSONALITIES > 2
170 , nerrnos2 = ARRAY_SIZE(errnoent2)
171 # endif
172 #endif
173 };
174
175 enum {
176 nsignals0 = ARRAY_SIZE(signalent0)
177 #if SUPPORTED_PERSONALITIES > 1
178 , nsignals1 = ARRAY_SIZE(signalent1)
179 # if SUPPORTED_PERSONALITIES > 2
180 , nsignals2 = ARRAY_SIZE(signalent2)
181 # endif
182 #endif
183 };
184
185 enum {
186 nioctlents0 = ARRAY_SIZE(ioctlent0)
187 #if SUPPORTED_PERSONALITIES > 1
188 , nioctlents1 = ARRAY_SIZE(ioctlent1)
189 # if SUPPORTED_PERSONALITIES > 2
190 , nioctlents2 = ARRAY_SIZE(ioctlent2)
191 # endif
192 #endif
193 };
194
195 #if SUPPORTED_PERSONALITIES > 1
196 const struct_sysent *sysent = sysent0;
197 const char *const *errnoent = errnoent0;
198 const char *const *signalent = signalent0;
199 const struct_ioctlent *ioctlent = ioctlent0;
200 #endif
201 unsigned nsyscalls = nsyscalls0;
202 unsigned nerrnos = nerrnos0;
203 unsigned nsignals = nsignals0;
204 unsigned nioctlents = nioctlents0;
205
206 unsigned num_quals;
207 qualbits_t *qual_vec[SUPPORTED_PERSONALITIES];
208
209 static const unsigned nsyscall_vec[SUPPORTED_PERSONALITIES] = {
210 nsyscalls0,
211 #if SUPPORTED_PERSONALITIES > 1
212 nsyscalls1,
213 #endif
214 #if SUPPORTED_PERSONALITIES > 2
215 nsyscalls2,
216 #endif
217 };
218 static const struct_sysent *const sysent_vec[SUPPORTED_PERSONALITIES] = {
219 sysent0,
220 #if SUPPORTED_PERSONALITIES > 1
221 sysent1,
222 #endif
223 #if SUPPORTED_PERSONALITIES > 2
224 sysent2,
225 #endif
226 };
227
228 enum {
229 MAX_NSYSCALLS1 = (nsyscalls0
230 #if SUPPORTED_PERSONALITIES > 1
231 > nsyscalls1 ? nsyscalls0 : nsyscalls1
232 #endif
233 ),
234 MAX_NSYSCALLS2 = (MAX_NSYSCALLS1
235 #if SUPPORTED_PERSONALITIES > 2
236 > nsyscalls2 ? MAX_NSYSCALLS1 : nsyscalls2
237 #endif
238 ),
239 MAX_NSYSCALLS = MAX_NSYSCALLS2,
240 /* We are ready for arches with up to 255 signals,
241 * even though the largest known signo is on MIPS and it is 128.
242 * The number of existing syscalls on all arches is
243 * larger that 255 anyway, so it is just a pedantic matter.
244 */
245 MIN_QUALS = MAX_NSYSCALLS > 255 ? MAX_NSYSCALLS : 255
246 };
247
248 #if SUPPORTED_PERSONALITIES > 1
249 unsigned current_personality;
250
251 # ifndef current_wordsize
252 unsigned current_wordsize;
253 static const int personality_wordsize[SUPPORTED_PERSONALITIES] = {
254 PERSONALITY0_WORDSIZE,
255 PERSONALITY1_WORDSIZE,
256 # if SUPPORTED_PERSONALITIES > 2
257 PERSONALITY2_WORDSIZE,
258 # endif
259 };
260 # endif
261
262 void
set_personality(int personality)263 set_personality(int personality)
264 {
265 nsyscalls = nsyscall_vec[personality];
266 sysent = sysent_vec[personality];
267
268 switch (personality) {
269 case 0:
270 errnoent = errnoent0;
271 nerrnos = nerrnos0;
272 ioctlent = ioctlent0;
273 nioctlents = nioctlents0;
274 signalent = signalent0;
275 nsignals = nsignals0;
276 break;
277
278 case 1:
279 errnoent = errnoent1;
280 nerrnos = nerrnos1;
281 ioctlent = ioctlent1;
282 nioctlents = nioctlents1;
283 signalent = signalent1;
284 nsignals = nsignals1;
285 break;
286
287 # if SUPPORTED_PERSONALITIES > 2
288 case 2:
289 errnoent = errnoent2;
290 nerrnos = nerrnos2;
291 ioctlent = ioctlent2;
292 nioctlents = nioctlents2;
293 signalent = signalent2;
294 nsignals = nsignals2;
295 break;
296 # endif
297 }
298
299 current_personality = personality;
300 # ifndef current_wordsize
301 current_wordsize = personality_wordsize[personality];
302 # endif
303 }
304
305 static void
update_personality(struct tcb * tcp,unsigned int personality)306 update_personality(struct tcb *tcp, unsigned int personality)
307 {
308 if (personality == current_personality)
309 return;
310 set_personality(personality);
311
312 if (personality == tcp->currpers)
313 return;
314 tcp->currpers = personality;
315
316 # if defined(POWERPC64)
317 if (!qflag) {
318 static const char *const names[] = {"64 bit", "32 bit"};
319 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n",
320 tcp->pid, names[personality]);
321 }
322 # elif defined(X86_64)
323 if (!qflag) {
324 static const char *const names[] = {"64 bit", "32 bit", "x32"};
325 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n",
326 tcp->pid, names[personality]);
327 }
328 # elif defined(X32)
329 if (!qflag) {
330 static const char *const names[] = {"x32", "32 bit"};
331 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n",
332 tcp->pid, names[personality]);
333 }
334 # elif defined(AARCH64)
335 if (!qflag) {
336 static const char *const names[] = {"32-bit", "AArch64"};
337 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n",
338 tcp->pid, names[personality]);
339 }
340 # elif defined(TILE)
341 if (!qflag) {
342 static const char *const names[] = {"64-bit", "32-bit"};
343 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n",
344 tcp->pid, names[personality]);
345 }
346 # endif
347 }
348 #endif
349
350 static int qual_syscall(), qual_signal(), qual_desc();
351
352 static const struct qual_options {
353 unsigned int bitflag;
354 const char *option_name;
355 int (*qualify)(const char *, int, int);
356 const char *argument_name;
357 } qual_options[] = {
358 { QUAL_TRACE, "trace", qual_syscall, "system call" },
359 { QUAL_TRACE, "t", qual_syscall, "system call" },
360 { QUAL_ABBREV, "abbrev", qual_syscall, "system call" },
361 { QUAL_ABBREV, "a", qual_syscall, "system call" },
362 { QUAL_VERBOSE, "verbose", qual_syscall, "system call" },
363 { QUAL_VERBOSE, "v", qual_syscall, "system call" },
364 { QUAL_RAW, "raw", qual_syscall, "system call" },
365 { QUAL_RAW, "x", qual_syscall, "system call" },
366 { QUAL_SIGNAL, "signal", qual_signal, "signal" },
367 { QUAL_SIGNAL, "signals", qual_signal, "signal" },
368 { QUAL_SIGNAL, "s", qual_signal, "signal" },
369 { QUAL_READ, "read", qual_desc, "descriptor" },
370 { QUAL_READ, "reads", qual_desc, "descriptor" },
371 { QUAL_READ, "r", qual_desc, "descriptor" },
372 { QUAL_WRITE, "write", qual_desc, "descriptor" },
373 { QUAL_WRITE, "writes", qual_desc, "descriptor" },
374 { QUAL_WRITE, "w", qual_desc, "descriptor" },
375 { 0, NULL, NULL, NULL },
376 };
377
378 static void
reallocate_qual(const unsigned int n)379 reallocate_qual(const unsigned int n)
380 {
381 unsigned p;
382 qualbits_t *qp;
383 for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
384 qp = qual_vec[p] = realloc(qual_vec[p], n * sizeof(qualbits_t));
385 if (!qp)
386 die_out_of_memory();
387 memset(&qp[num_quals], 0, (n - num_quals) * sizeof(qualbits_t));
388 }
389 num_quals = n;
390 }
391
392 static void
qualify_one(const unsigned int n,unsigned int bitflag,const int not,const int pers)393 qualify_one(const unsigned int n, unsigned int bitflag, const int not, const int pers)
394 {
395 int p;
396
397 if (num_quals <= n)
398 reallocate_qual(n + 1);
399
400 for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
401 if (pers == p || pers < 0) {
402 if (not)
403 qual_vec[p][n] &= ~bitflag;
404 else
405 qual_vec[p][n] |= bitflag;
406 }
407 }
408 }
409
410 static int
qual_syscall(const char * s,const unsigned int bitflag,const int not)411 qual_syscall(const char *s, const unsigned int bitflag, const int not)
412 {
413 int p;
414 unsigned int i;
415 int rc = -1;
416
417 if (*s >= '0' && *s <= '9') {
418 i = string_to_uint(s);
419 if (i >= MAX_NSYSCALLS)
420 return -1;
421 qualify_one(i, bitflag, not, -1);
422 return 0;
423 }
424
425 for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
426 for (i = 0; i < nsyscall_vec[p]; i++) {
427 if (sysent_vec[p][i].sys_name
428 && strcmp(s, sysent_vec[p][i].sys_name) == 0
429 ) {
430 qualify_one(i, bitflag, not, p);
431 rc = 0;
432 }
433 }
434 }
435
436 return rc;
437 }
438
439 static int
qual_signal(const char * s,const unsigned int bitflag,const int not)440 qual_signal(const char *s, const unsigned int bitflag, const int not)
441 {
442 unsigned int i;
443
444 if (*s >= '0' && *s <= '9') {
445 int signo = string_to_uint(s);
446 if (signo < 0 || signo > 255)
447 return -1;
448 qualify_one(signo, bitflag, not, -1);
449 return 0;
450 }
451 if (strncasecmp(s, "SIG", 3) == 0)
452 s += 3;
453 for (i = 0; i <= NSIG; i++) {
454 if (strcasecmp(s, signame(i) + 3) == 0) {
455 qualify_one(i, bitflag, not, -1);
456 return 0;
457 }
458 }
459 return -1;
460 }
461
462 static int
qual_desc(const char * s,const unsigned int bitflag,const int not)463 qual_desc(const char *s, const unsigned int bitflag, const int not)
464 {
465 if (*s >= '0' && *s <= '9') {
466 int desc = string_to_uint(s);
467 if (desc < 0 || desc > 0x7fff) /* paranoia */
468 return -1;
469 qualify_one(desc, bitflag, not, -1);
470 return 0;
471 }
472 return -1;
473 }
474
475 static int
lookup_class(const char * s)476 lookup_class(const char *s)
477 {
478 if (strcmp(s, "file") == 0)
479 return TRACE_FILE;
480 if (strcmp(s, "ipc") == 0)
481 return TRACE_IPC;
482 if (strcmp(s, "network") == 0)
483 return TRACE_NETWORK;
484 if (strcmp(s, "process") == 0)
485 return TRACE_PROCESS;
486 if (strcmp(s, "signal") == 0)
487 return TRACE_SIGNAL;
488 if (strcmp(s, "desc") == 0)
489 return TRACE_DESC;
490 if (strcmp(s, "memory") == 0)
491 return TRACE_MEMORY;
492 return -1;
493 }
494
495 void
qualify(const char * s)496 qualify(const char *s)
497 {
498 const struct qual_options *opt;
499 char *copy;
500 const char *p;
501 int not;
502 unsigned int i;
503
504 if (num_quals == 0)
505 reallocate_qual(MIN_QUALS);
506
507 opt = &qual_options[0];
508 for (i = 0; (p = qual_options[i].option_name); i++) {
509 unsigned int len = strlen(p);
510 if (strncmp(s, p, len) == 0 && s[len] == '=') {
511 opt = &qual_options[i];
512 s += len + 1;
513 break;
514 }
515 }
516 not = 0;
517 if (*s == '!') {
518 not = 1;
519 s++;
520 }
521 if (strcmp(s, "none") == 0) {
522 not = 1 - not;
523 s = "all";
524 }
525 if (strcmp(s, "all") == 0) {
526 for (i = 0; i < num_quals; i++) {
527 qualify_one(i, opt->bitflag, not, -1);
528 }
529 return;
530 }
531 for (i = 0; i < num_quals; i++) {
532 qualify_one(i, opt->bitflag, !not, -1);
533 }
534 copy = strdup(s);
535 if (!copy)
536 die_out_of_memory();
537 for (p = strtok(copy, ","); p; p = strtok(NULL, ",")) {
538 int n;
539 if (opt->bitflag == QUAL_TRACE && (n = lookup_class(p)) > 0) {
540 unsigned pers;
541 for (pers = 0; pers < SUPPORTED_PERSONALITIES; pers++) {
542 for (i = 0; i < nsyscall_vec[pers]; i++)
543 if (sysent_vec[pers][i].sys_flags & n)
544 qualify_one(i, opt->bitflag, not, pers);
545 }
546 continue;
547 }
548 if (opt->qualify(p, opt->bitflag, not)) {
549 error_msg_and_die("invalid %s '%s'",
550 opt->argument_name, p);
551 }
552 }
553 free(copy);
554 return;
555 }
556
557 #ifdef SYS_socket_subcall
558 static void
decode_socket_subcall(struct tcb * tcp)559 decode_socket_subcall(struct tcb *tcp)
560 {
561 unsigned long addr;
562 unsigned int n;
563
564 if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_socket_nsubcalls)
565 return;
566
567 tcp->scno = SYS_socket_subcall + tcp->u_arg[0];
568 tcp->qual_flg = qual_flags[tcp->scno];
569 tcp->s_ent = &sysent[tcp->scno];
570 addr = tcp->u_arg[1];
571 n = tcp->s_ent->nargs;
572 if (sizeof(tcp->u_arg[0]) == current_wordsize) {
573 memset(tcp->u_arg, 0, n * sizeof(tcp->u_arg[0]));
574 (void) umoven(tcp, addr, n * sizeof(tcp->u_arg[0]), tcp->u_arg);
575 } else {
576 unsigned int args[n];
577 unsigned int i;
578
579 memset(args, 0, sizeof(args));
580 (void) umove(tcp, addr, &args);
581 for (i = 0; i < n; ++i)
582 tcp->u_arg[i] = args[i];
583 }
584 }
585 #endif
586
587 #ifdef SYS_ipc_subcall
588 static void
decode_ipc_subcall(struct tcb * tcp)589 decode_ipc_subcall(struct tcb *tcp)
590 {
591 unsigned int i, n;
592
593 if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_ipc_nsubcalls)
594 return;
595
596 tcp->scno = SYS_ipc_subcall + tcp->u_arg[0];
597 tcp->qual_flg = qual_flags[tcp->scno];
598 tcp->s_ent = &sysent[tcp->scno];
599 n = tcp->s_ent->nargs;
600 for (i = 0; i < n; i++)
601 tcp->u_arg[i] = tcp->u_arg[i + 1];
602 }
603 #endif
604
605 int
printargs(struct tcb * tcp)606 printargs(struct tcb *tcp)
607 {
608 if (entering(tcp)) {
609 int i;
610 int n = tcp->s_ent->nargs;
611 for (i = 0; i < n; i++)
612 tprintf("%s%#lx", i ? ", " : "", tcp->u_arg[i]);
613 }
614 return 0;
615 }
616
617 int
printargs_lu(struct tcb * tcp)618 printargs_lu(struct tcb *tcp)
619 {
620 if (entering(tcp)) {
621 int i;
622 int n = tcp->s_ent->nargs;
623 for (i = 0; i < n; i++)
624 tprintf("%s%lu", i ? ", " : "", tcp->u_arg[i]);
625 }
626 return 0;
627 }
628
629 int
printargs_ld(struct tcb * tcp)630 printargs_ld(struct tcb *tcp)
631 {
632 if (entering(tcp)) {
633 int i;
634 int n = tcp->s_ent->nargs;
635 for (i = 0; i < n; i++)
636 tprintf("%s%ld", i ? ", " : "", tcp->u_arg[i]);
637 }
638 return 0;
639 }
640
641 static void
dumpio(struct tcb * tcp)642 dumpio(struct tcb *tcp)
643 {
644 int (*func)();
645
646 if (syserror(tcp))
647 return;
648 if ((unsigned long) tcp->u_arg[0] >= num_quals)
649 return;
650 func = tcp->s_ent->sys_func;
651 if (func == printargs)
652 return;
653 if (qual_flags[tcp->u_arg[0]] & QUAL_READ) {
654 if (func == sys_read ||
655 func == sys_pread ||
656 func == sys_recv ||
657 func == sys_recvfrom) {
658 dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
659 return;
660 } else if (func == sys_readv) {
661 dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
662 return;
663 #if HAVE_SENDMSG
664 } else if (func == sys_recvmsg) {
665 dumpiov_in_msghdr(tcp, tcp->u_arg[1]);
666 return;
667 } else if (func == sys_recvmmsg) {
668 dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
669 return;
670 #endif
671 }
672 }
673 if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE) {
674 if (func == sys_write ||
675 func == sys_pwrite ||
676 func == sys_send ||
677 func == sys_sendto)
678 dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
679 else if (func == sys_writev)
680 dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
681 #if HAVE_SENDMSG
682 else if (func == sys_sendmsg)
683 dumpiov_in_msghdr(tcp, tcp->u_arg[1]);
684 else if (func == sys_sendmmsg)
685 dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
686 #endif
687 }
688 }
689
690 /*
691 * Shuffle syscall numbers so that we don't have huge gaps in syscall table.
692 * The shuffling should be an involution: shuffle_scno(shuffle_scno(n)) == n.
693 */
694 #if defined(ARM) || defined(AARCH64) /* So far only 32-bit ARM needs this */
695 static long
shuffle_scno(unsigned long scno)696 shuffle_scno(unsigned long scno)
697 {
698 if (scno < ARM_FIRST_SHUFFLED_SYSCALL)
699 return scno;
700
701 /* __ARM_NR_cmpxchg? Swap with LAST_ORDINARY+1 */
702 if (scno == ARM_FIRST_SHUFFLED_SYSCALL)
703 return 0x000ffff0;
704 if (scno == 0x000ffff0)
705 return ARM_FIRST_SHUFFLED_SYSCALL;
706
707 #define ARM_SECOND_SHUFFLED_SYSCALL (ARM_FIRST_SHUFFLED_SYSCALL + 1)
708 /*
709 * Is it ARM specific syscall?
710 * Swap [0x000f0000, 0x000f0000 + LAST_SPECIAL] range
711 * with [SECOND_SHUFFLED, SECOND_SHUFFLED + LAST_SPECIAL] range.
712 */
713 if (scno >= 0x000f0000 &&
714 scno <= 0x000f0000 + ARM_LAST_SPECIAL_SYSCALL) {
715 return scno - 0x000f0000 + ARM_SECOND_SHUFFLED_SYSCALL;
716 }
717 if (scno <= ARM_SECOND_SHUFFLED_SYSCALL + ARM_LAST_SPECIAL_SYSCALL) {
718 return scno + 0x000f0000 - ARM_SECOND_SHUFFLED_SYSCALL;
719 }
720
721 return scno;
722 }
723 #else
724 # define shuffle_scno(scno) ((long)(scno))
725 #endif
726
727 static char*
undefined_scno_name(struct tcb * tcp)728 undefined_scno_name(struct tcb *tcp)
729 {
730 static char buf[sizeof("syscall_%lu") + sizeof(long)*3];
731
732 sprintf(buf, "syscall_%lu", shuffle_scno(tcp->scno));
733 return buf;
734 }
735
736 static long get_regs_error;
737
738 void
clear_regs(void)739 clear_regs(void)
740 {
741 get_regs_error = -1;
742 }
743
744 static int get_syscall_args(struct tcb *);
745 static int get_syscall_result(struct tcb *);
746
747 static int
trace_syscall_entering(struct tcb * tcp)748 trace_syscall_entering(struct tcb *tcp)
749 {
750 int res, scno_good;
751
752 scno_good = res = get_scno(tcp);
753 if (res == 0)
754 return res;
755 if (res == 1)
756 res = get_syscall_args(tcp);
757
758 if (res != 1) {
759 printleader(tcp);
760 if (scno_good != 1)
761 tprints("????" /* anti-trigraph gap */ "(");
762 else if (tcp->qual_flg & UNDEFINED_SCNO)
763 tprintf("%s(", undefined_scno_name(tcp));
764 else
765 tprintf("%s(", tcp->s_ent->sys_name);
766 /*
767 * " <unavailable>" will be added later by the code which
768 * detects ptrace errors.
769 */
770 goto ret;
771 }
772
773 if ( sys_execve == tcp->s_ent->sys_func
774 # if defined(SPARC) || defined(SPARC64)
775 || sys_execv == tcp->s_ent->sys_func
776 # endif
777 ) {
778 hide_log_until_execve = 0;
779 }
780
781 #if defined(SYS_socket_subcall) || defined(SYS_ipc_subcall)
782 while (1) {
783 # ifdef SYS_socket_subcall
784 if (tcp->s_ent->sys_func == sys_socketcall) {
785 decode_socket_subcall(tcp);
786 break;
787 }
788 # endif
789 # ifdef SYS_ipc_subcall
790 if (tcp->s_ent->sys_func == sys_ipc) {
791 decode_ipc_subcall(tcp);
792 break;
793 }
794 # endif
795 break;
796 }
797 #endif
798
799 if (!(tcp->qual_flg & QUAL_TRACE)
800 || (tracing_paths && !pathtrace_match(tcp))
801 ) {
802 tcp->flags |= TCB_INSYSCALL | TCB_FILTERED;
803 return 0;
804 }
805
806 tcp->flags &= ~TCB_FILTERED;
807
808 if (cflag == CFLAG_ONLY_STATS || hide_log_until_execve) {
809 res = 0;
810 goto ret;
811 }
812
813 #ifdef USE_LIBUNWIND
814 if (stack_trace_enabled) {
815 if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER)
816 unwind_capture_stacktrace(tcp);
817 }
818 #endif
819
820 printleader(tcp);
821 if (tcp->qual_flg & UNDEFINED_SCNO)
822 tprintf("%s(", undefined_scno_name(tcp));
823 else
824 tprintf("%s(", tcp->s_ent->sys_name);
825 if ((tcp->qual_flg & QUAL_RAW) && tcp->s_ent->sys_func != sys_exit)
826 res = printargs(tcp);
827 else
828 res = tcp->s_ent->sys_func(tcp);
829
830 fflush(tcp->outf);
831 ret:
832 tcp->flags |= TCB_INSYSCALL;
833 /* Measure the entrance time as late as possible to avoid errors. */
834 if (Tflag || cflag)
835 gettimeofday(&tcp->etime, NULL);
836 return res;
837 }
838
839 static int
trace_syscall_exiting(struct tcb * tcp)840 trace_syscall_exiting(struct tcb *tcp)
841 {
842 int sys_res;
843 struct timeval tv;
844 int res;
845 long u_error;
846
847 /* Measure the exit time as early as possible to avoid errors. */
848 if (Tflag || cflag)
849 gettimeofday(&tv, NULL);
850
851 #ifdef USE_LIBUNWIND
852 if (stack_trace_enabled) {
853 if (tcp->s_ent->sys_flags & STACKTRACE_INVALIDATE_CACHE)
854 unwind_cache_invalidate(tcp);
855 }
856 #endif
857
858 #if SUPPORTED_PERSONALITIES > 1
859 update_personality(tcp, tcp->currpers);
860 #endif
861 res = (get_regs_error ? -1 : get_syscall_result(tcp));
862 if (res == 1) {
863 if (filtered(tcp) || hide_log_until_execve)
864 goto ret;
865 }
866
867 if (cflag) {
868 count_syscall(tcp, &tv);
869 if (cflag == CFLAG_ONLY_STATS) {
870 goto ret;
871 }
872 }
873
874 /* If not in -ff mode, and printing_tcp != tcp,
875 * then the log currently does not end with output
876 * of _our syscall entry_, but with something else.
877 * We need to say which syscall's return is this.
878 *
879 * Forced reprinting via TCB_REPRINT is used only by
880 * "strace -ff -oLOG test/threaded_execve" corner case.
881 * It's the only case when -ff mode needs reprinting.
882 */
883 if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) {
884 tcp->flags &= ~TCB_REPRINT;
885 printleader(tcp);
886 if (tcp->qual_flg & UNDEFINED_SCNO)
887 tprintf("<... %s resumed> ", undefined_scno_name(tcp));
888 else
889 tprintf("<... %s resumed> ", tcp->s_ent->sys_name);
890 }
891 printing_tcp = tcp;
892
893 tcp->s_prev_ent = NULL;
894 if (res != 1) {
895 /* There was error in one of prior ptrace ops */
896 tprints(") ");
897 tabto();
898 tprints("= ? <unavailable>\n");
899 line_ended();
900 tcp->flags &= ~TCB_INSYSCALL;
901 return res;
902 }
903 tcp->s_prev_ent = tcp->s_ent;
904
905 sys_res = 0;
906 if (tcp->qual_flg & QUAL_RAW) {
907 /* sys_res = printargs(tcp); - but it's nop on sysexit */
908 } else {
909 /* FIXME: not_failing_only (IOW, option -z) is broken:
910 * failure of syscall is known only after syscall return.
911 * Thus we end up with something like this on, say, ENOENT:
912 * open("doesnt_exist", O_RDONLY <unfinished ...>
913 * {next syscall decode}
914 * whereas the intended result is that open(...) line
915 * is not shown at all.
916 */
917 if (not_failing_only && tcp->u_error)
918 goto ret; /* ignore failed syscalls */
919 sys_res = tcp->s_ent->sys_func(tcp);
920 }
921
922 tprints(") ");
923 tabto();
924 u_error = tcp->u_error;
925 if (tcp->qual_flg & QUAL_RAW) {
926 if (u_error)
927 tprintf("= -1 (errno %ld)", u_error);
928 else
929 tprintf("= %#lx", tcp->u_rval);
930 }
931 else if (!(sys_res & RVAL_NONE) && u_error) {
932 switch (u_error) {
933 /* Blocked signals do not interrupt any syscalls.
934 * In this case syscalls don't return ERESTARTfoo codes.
935 *
936 * Deadly signals set to SIG_DFL interrupt syscalls
937 * and kill the process regardless of which of the codes below
938 * is returned by the interrupted syscall.
939 * In some cases, kernel forces a kernel-generated deadly
940 * signal to be unblocked and set to SIG_DFL (and thus cause
941 * death) if it is blocked or SIG_IGNed: for example, SIGSEGV
942 * or SIGILL. (The alternative is to leave process spinning
943 * forever on the faulty instruction - not useful).
944 *
945 * SIG_IGNed signals and non-deadly signals set to SIG_DFL
946 * (for example, SIGCHLD, SIGWINCH) interrupt syscalls,
947 * but kernel will always restart them.
948 */
949 case ERESTARTSYS:
950 /* Most common type of signal-interrupted syscall exit code.
951 * The system call will be restarted with the same arguments
952 * if SA_RESTART is set; otherwise, it will fail with EINTR.
953 */
954 tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)");
955 break;
956 case ERESTARTNOINTR:
957 /* Rare. For example, fork() returns this if interrupted.
958 * SA_RESTART is ignored (assumed set): the restart is unconditional.
959 */
960 tprints("= ? ERESTARTNOINTR (To be restarted)");
961 break;
962 case ERESTARTNOHAND:
963 /* pause(), rt_sigsuspend() etc use this code.
964 * SA_RESTART is ignored (assumed not set):
965 * syscall won't restart (will return EINTR instead)
966 * even after signal with SA_RESTART set. However,
967 * after SIG_IGN or SIG_DFL signal it will restart
968 * (thus the name "restart only if has no handler").
969 */
970 tprints("= ? ERESTARTNOHAND (To be restarted if no handler)");
971 break;
972 case ERESTART_RESTARTBLOCK:
973 /* Syscalls like nanosleep(), poll() which can't be
974 * restarted with their original arguments use this
975 * code. Kernel will execute restart_syscall() instead,
976 * which changes arguments before restarting syscall.
977 * SA_RESTART is ignored (assumed not set) similarly
978 * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART
979 * since restart data is saved in "restart block"
980 * in task struct, and if signal handler uses a syscall
981 * which in turn saves another such restart block,
982 * old data is lost and restart becomes impossible)
983 */
984 tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)");
985 break;
986 default:
987 if ((unsigned long) u_error < nerrnos
988 && errnoent[u_error])
989 tprintf("= -1 %s (%s)", errnoent[u_error],
990 strerror(u_error));
991 else
992 tprintf("= -1 ERRNO_%lu (%s)", u_error,
993 strerror(u_error));
994 break;
995 }
996 if ((sys_res & RVAL_STR) && tcp->auxstr)
997 tprintf(" (%s)", tcp->auxstr);
998 }
999 else {
1000 if (sys_res & RVAL_NONE)
1001 tprints("= ?");
1002 else {
1003 switch (sys_res & RVAL_MASK) {
1004 case RVAL_HEX:
1005 #if SUPPORTED_PERSONALITIES > 1
1006 if (current_wordsize < sizeof(long))
1007 tprintf("= %#x",
1008 (unsigned int) tcp->u_rval);
1009 else
1010 #endif
1011 tprintf("= %#lx", tcp->u_rval);
1012 break;
1013 case RVAL_OCTAL:
1014 tprintf("= %#lo", tcp->u_rval);
1015 break;
1016 case RVAL_UDECIMAL:
1017 tprintf("= %lu", tcp->u_rval);
1018 break;
1019 case RVAL_DECIMAL:
1020 tprintf("= %ld", tcp->u_rval);
1021 break;
1022 case RVAL_FD:
1023 if (show_fd_path) {
1024 tprints("= ");
1025 printfd(tcp, tcp->u_rval);
1026 }
1027 else
1028 tprintf("= %ld", tcp->u_rval);
1029 break;
1030 #if defined(LINUX_MIPSN32) || defined(X32)
1031 /*
1032 case RVAL_LHEX:
1033 tprintf("= %#llx", tcp->u_lrval);
1034 break;
1035 case RVAL_LOCTAL:
1036 tprintf("= %#llo", tcp->u_lrval);
1037 break;
1038 */
1039 case RVAL_LUDECIMAL:
1040 tprintf("= %llu", tcp->u_lrval);
1041 break;
1042 /*
1043 case RVAL_LDECIMAL:
1044 tprintf("= %lld", tcp->u_lrval);
1045 break;
1046 */
1047 #endif
1048 default:
1049 fprintf(stderr,
1050 "invalid rval format\n");
1051 break;
1052 }
1053 }
1054 if ((sys_res & RVAL_STR) && tcp->auxstr)
1055 tprintf(" (%s)", tcp->auxstr);
1056 }
1057 if (Tflag) {
1058 tv_sub(&tv, &tv, &tcp->etime);
1059 tprintf(" <%ld.%06ld>",
1060 (long) tv.tv_sec, (long) tv.tv_usec);
1061 }
1062 tprints("\n");
1063 dumpio(tcp);
1064 line_ended();
1065
1066 #ifdef USE_LIBUNWIND
1067 if (stack_trace_enabled)
1068 unwind_print_stacktrace(tcp);
1069 #endif
1070
1071 ret:
1072 tcp->flags &= ~TCB_INSYSCALL;
1073 return 0;
1074 }
1075
1076 int
trace_syscall(struct tcb * tcp)1077 trace_syscall(struct tcb *tcp)
1078 {
1079 return exiting(tcp) ?
1080 trace_syscall_exiting(tcp) : trace_syscall_entering(tcp);
1081 }
1082
1083 /*
1084 * Cannot rely on __kernel_[u]long_t being defined,
1085 * it is quite a recent feature of <asm/posix_types.h>.
1086 */
1087 #ifdef __kernel_long_t
1088 typedef __kernel_long_t kernel_long_t;
1089 typedef __kernel_ulong_t kernel_ulong_t;
1090 #else
1091 # ifdef X32
1092 typedef long long kernel_long_t;
1093 typedef unsigned long long kernel_ulong_t;
1094 # else
1095 typedef long kernel_long_t;
1096 typedef unsigned long kernel_ulong_t;
1097 # endif
1098 #endif
1099
1100 /*
1101 * Check the syscall return value register value for whether it is
1102 * a negated errno code indicating an error, or a success return value.
1103 */
1104 static inline bool
is_negated_errno(kernel_ulong_t val)1105 is_negated_errno(kernel_ulong_t val)
1106 {
1107 /* Linux kernel defines MAX_ERRNO to 4095. */
1108 kernel_ulong_t max = -(kernel_long_t) 4095;
1109
1110 #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
1111 if (current_wordsize < sizeof(val)) {
1112 val = (uint32_t) val;
1113 max = (uint32_t) max;
1114 }
1115 #elif defined X32
1116 /*
1117 * current_wordsize is 4 even in personality 0 (native X32)
1118 * but truncation _must not_ be done in it.
1119 * can't check current_wordsize here!
1120 */
1121 if (current_personality != 0) {
1122 val = (uint32_t) val;
1123 max = (uint32_t) max;
1124 }
1125 #endif
1126
1127 return val >= max;
1128 }
1129
1130 #include "arch_regs.c"
1131
1132 #ifdef HAVE_GETRVAL2
1133 # include "arch_getrval2.c"
1134 #endif
1135
1136 void
print_pc(struct tcb * tcp)1137 print_pc(struct tcb *tcp)
1138 {
1139 const char *fmt;
1140 const char *bad;
1141
1142 #ifdef current_wordsize
1143 # define pc_wordsize current_wordsize
1144 #else
1145 # define pc_wordsize personality_wordsize[tcp->currpers]
1146 #endif
1147
1148 if (pc_wordsize == 4) {
1149 fmt = "[%08lx] ";
1150 bad = "[????????] ";
1151 } else {
1152 fmt = "[%016lx] ";
1153 bad = "[????????????????] ";
1154 }
1155
1156 #undef pc_wordsize
1157 #define PRINTBADPC tprints(bad)
1158
1159 if (get_regs_error) {
1160 PRINTBADPC;
1161 return;
1162 }
1163
1164 #include "print_pc.c"
1165 }
1166
1167 #if defined X86_64 || defined POWERPC
1168 # include "getregs_old.c"
1169 #endif
1170
1171 #if defined ARCH_REGS_FOR_GETREGSET
1172 static long
get_regset(pid_t pid)1173 get_regset(pid_t pid)
1174 {
1175 # ifdef ARCH_IOVEC_FOR_GETREGSET
1176 /* variable iovec */
1177 ARCH_IOVEC_FOR_GETREGSET.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET);
1178 return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS,
1179 &ARCH_IOVEC_FOR_GETREGSET);
1180 # else
1181 /* constant iovec */
1182 static struct iovec io = {
1183 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1184 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1185 };
1186 return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io);
1187
1188 # endif
1189 }
1190 #endif /* ARCH_REGS_FOR_GETREGSET */
1191
1192 void
get_regs(pid_t pid)1193 get_regs(pid_t pid)
1194 {
1195 #ifdef ARCH_REGS_FOR_GETREGSET
1196 # ifdef X86_64
1197 /* Try PTRACE_GETREGSET first, fallback to PTRACE_GETREGS. */
1198 static int getregset_support;
1199
1200 if (getregset_support >= 0) {
1201 get_regs_error = get_regset(pid);
1202 if (getregset_support > 0)
1203 return;
1204 if (get_regs_error >= 0) {
1205 getregset_support = 1;
1206 return;
1207 }
1208 if (errno == EPERM || errno == ESRCH)
1209 return;
1210 getregset_support = -1;
1211 }
1212 getregs_old(pid);
1213 # else /* !X86_64 */
1214 /* Assume that PTRACE_GETREGSET works. */
1215 get_regs_error = get_regset(pid);
1216 # endif
1217 #elif defined ARCH_REGS_FOR_GETREGS
1218 # if defined SPARC || defined SPARC64
1219 /* SPARC systems have the meaning of data and addr reversed */
1220 get_regs_error = ptrace(PTRACE_GETREGS, pid, (char *)&ARCH_REGS_FOR_GETREGS, 0);
1221 # elif defined POWERPC
1222 static bool old_kernel = 0;
1223 if (old_kernel)
1224 goto old;
1225 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1226 if (get_regs_error && errno == EIO) {
1227 old_kernel = 1;
1228 old:
1229 get_regs_error = getregs_old(pid);
1230 }
1231 # else
1232 /* Assume that PTRACE_GETREGS works. */
1233 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1234 # endif
1235
1236 #else /* !ARCH_REGS_FOR_GETREGSET && !ARCH_REGS_FOR_GETREGS */
1237 # warning get_regs is not implemented for this architecture yet
1238 get_regs_error = 0;
1239 #endif
1240 }
1241
1242 /* Returns:
1243 * 0: "ignore this ptrace stop", bail out of trace_syscall_entering() silently.
1244 * 1: ok, continue in trace_syscall_entering().
1245 * other: error, trace_syscall_entering() should print error indicator
1246 * ("????" etc) and bail out.
1247 */
1248 int
get_scno(struct tcb * tcp)1249 get_scno(struct tcb *tcp)
1250 {
1251 if (get_regs_error)
1252 return -1;
1253
1254 long scno = 0;
1255
1256 #include "get_scno.c"
1257
1258 tcp->scno = scno;
1259 if (SCNO_IS_VALID(tcp->scno)) {
1260 tcp->s_ent = &sysent[scno];
1261 tcp->qual_flg = qual_flags[scno];
1262 } else {
1263 static const struct_sysent unknown = {
1264 .nargs = MAX_ARGS,
1265 .sys_flags = 0,
1266 .sys_func = printargs,
1267 .sys_name = "system call",
1268 };
1269 tcp->s_ent = &unknown;
1270 tcp->qual_flg = UNDEFINED_SCNO | QUAL_RAW | DEFAULT_QUAL_FLAGS;
1271 if (debug_flag)
1272 fprintf(stderr, "pid %d invalid syscall %ld\n",
1273 tcp->pid, scno);
1274 }
1275 return 1;
1276 }
1277
1278 /* Return -1 on error or 1 on success (never 0!) */
1279 static int
get_syscall_args(struct tcb * tcp)1280 get_syscall_args(struct tcb *tcp)
1281 {
1282 #include "get_syscall_args.c"
1283 return 1;
1284 }
1285
1286 static void
get_error(struct tcb * tcp)1287 get_error(struct tcb *tcp)
1288 {
1289 const bool check_errno = !(tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS);
1290 tcp->u_error = 0;
1291
1292 #include "get_error.c"
1293 }
1294
1295 /* Returns:
1296 * 1: ok, continue in trace_syscall_exiting().
1297 * -1: error, trace_syscall_exiting() should print error indicator
1298 * ("????" etc) and bail out.
1299 */
1300 static int
get_syscall_result(struct tcb * tcp)1301 get_syscall_result(struct tcb *tcp)
1302 {
1303 #if defined ARCH_REGS_FOR_GETREGSET || defined ARCH_REGS_FOR_GETREGS
1304 /* already done by get_regs */
1305 #else
1306 # include "get_syscall_result.c"
1307 #endif
1308 get_error(tcp);
1309 return 1;
1310 }
1311