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 * Copyright (c) 1999-2018 The strace developers.
10 * All rights reserved.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. The name of the author may not be used to endorse or promote products
21 * derived from this software without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 #include "mmap_cache.h"
37 #include "native_defs.h"
40 #include "number_set.h"
45 /* for struct iovec */
48 /* for __X32_SYSCALL_BIT */
49 #include <asm/unistd.h>
54 # undef PTRACE_GETREGS
55 # define PTRACE_GETREGS PTRACE_GETREGS64
56 # undef PTRACE_SETREGS
57 # define PTRACE_SETREGS PTRACE_SETREGS64
61 # define NT_PRSTATUS 1
67 /* Define these shorthand notations to simplify the syscallent files. */
68 #include "sysent_shorthand_defs.h"
70 #define SEN(syscall_name) SEN_ ## syscall_name, SYS_FUNC_NAME(sys_ ## syscall_name)
72 const struct_sysent sysent0[] = {
73 #include "syscallent.h"
76 #if SUPPORTED_PERSONALITIES > 1
77 # include PERSONALITY1_INCLUDE_FUNCS
78 static const struct_sysent sysent1[] = {
79 # include "syscallent1.h"
83 #if SUPPORTED_PERSONALITIES > 2
84 # include PERSONALITY2_INCLUDE_FUNCS
85 static const struct_sysent sysent2[] = {
86 # include "syscallent2.h"
90 /* Now undef them since short defines cause wicked namespace pollution. */
91 #include "sysent_shorthand_undefs.h"
94 * `ioctlent[012].h' files are automatically generated by the auxiliary
95 * program `ioctlsort', such that the list is sorted by the `code' field.
96 * This has the side-effect of resolving the _IO.. macros into
97 * plain integers, eliminating the need to include here everything
101 const char *const errnoent0[] = {
102 #include "errnoent.h"
104 const char *const signalent0[] = {
105 #include "signalent.h"
107 const struct_ioctlent ioctlent0[] = {
108 #include "ioctlent0.h"
111 #if SUPPORTED_PERSONALITIES > 1
112 static const char *const errnoent1[] = {
113 # include "errnoent1.h"
115 static const char *const signalent1[] = {
116 # include "signalent1.h"
118 static const struct_ioctlent ioctlent1[] = {
119 # include "ioctlent1.h"
121 # include PERSONALITY0_INCLUDE_PRINTERS_DECLS
122 static const struct_printers printers0 = {
123 # include PERSONALITY0_INCLUDE_PRINTERS_DEFS
125 # include PERSONALITY1_INCLUDE_PRINTERS_DECLS
126 static const struct_printers printers1 = {
127 # include PERSONALITY1_INCLUDE_PRINTERS_DEFS
131 #if SUPPORTED_PERSONALITIES > 2
132 static const char *const errnoent2[] = {
133 # include "errnoent2.h"
135 static const char *const signalent2[] = {
136 # include "signalent2.h"
138 static const struct_ioctlent ioctlent2[] = {
139 # include "ioctlent2.h"
141 # include PERSONALITY2_INCLUDE_PRINTERS_DECLS
142 static const struct_printers printers2 = {
143 # include PERSONALITY2_INCLUDE_PRINTERS_DEFS
148 nsyscalls0 = ARRAY_SIZE(sysent0)
149 #if SUPPORTED_PERSONALITIES > 1
150 , nsyscalls1 = ARRAY_SIZE(sysent1)
151 # if SUPPORTED_PERSONALITIES > 2
152 , nsyscalls2 = ARRAY_SIZE(sysent2)
158 nerrnos0 = ARRAY_SIZE(errnoent0)
159 #if SUPPORTED_PERSONALITIES > 1
160 , nerrnos1 = ARRAY_SIZE(errnoent1)
161 # if SUPPORTED_PERSONALITIES > 2
162 , nerrnos2 = ARRAY_SIZE(errnoent2)
168 nsignals0 = ARRAY_SIZE(signalent0)
169 #if SUPPORTED_PERSONALITIES > 1
170 , nsignals1 = ARRAY_SIZE(signalent1)
171 # if SUPPORTED_PERSONALITIES > 2
172 , nsignals2 = ARRAY_SIZE(signalent2)
178 nioctlents0 = ARRAY_SIZE(ioctlent0)
179 #if SUPPORTED_PERSONALITIES > 1
180 , nioctlents1 = ARRAY_SIZE(ioctlent1)
181 # if SUPPORTED_PERSONALITIES > 2
182 , nioctlents2 = ARRAY_SIZE(ioctlent2)
187 #if SUPPORTED_PERSONALITIES > 1
188 const struct_sysent *sysent = sysent0;
189 const char *const *errnoent = errnoent0;
190 const char *const *signalent = signalent0;
191 const struct_ioctlent *ioctlent = ioctlent0;
192 const struct_printers *printers = &printers0;
195 unsigned nsyscalls = nsyscalls0;
196 unsigned nerrnos = nerrnos0;
197 unsigned nsignals = nsignals0;
198 unsigned nioctlents = nioctlents0;
200 const unsigned int nsyscall_vec[SUPPORTED_PERSONALITIES] = {
202 #if SUPPORTED_PERSONALITIES > 1
205 #if SUPPORTED_PERSONALITIES > 2
209 const struct_sysent *const sysent_vec[SUPPORTED_PERSONALITIES] = {
211 #if SUPPORTED_PERSONALITIES > 1
214 #if SUPPORTED_PERSONALITIES > 2
219 const char *const personality_names[] =
221 {"64 bit", "32 bit", "x32"}
224 # elif SUPPORTED_PERSONALITIES == 2
227 {STRINGIFY_VAL(__WORDSIZE) " bit"}
231 #if SUPPORTED_PERSONALITIES > 1
233 unsigned current_personality;
235 # ifndef current_wordsize
236 unsigned current_wordsize = PERSONALITY0_WORDSIZE;
237 static const int personality_wordsize[SUPPORTED_PERSONALITIES] = {
238 PERSONALITY0_WORDSIZE,
239 PERSONALITY1_WORDSIZE,
240 # if SUPPORTED_PERSONALITIES > 2
241 PERSONALITY2_WORDSIZE,
246 # ifndef current_klongsize
247 unsigned current_klongsize = PERSONALITY0_KLONGSIZE;
248 static const int personality_klongsize[SUPPORTED_PERSONALITIES] = {
249 PERSONALITY0_KLONGSIZE,
250 PERSONALITY1_KLONGSIZE,
251 # if SUPPORTED_PERSONALITIES > 2
252 PERSONALITY2_KLONGSIZE,
258 set_personality(unsigned int personality)
260 if (personality == current_personality)
263 if (personality >= SUPPORTED_PERSONALITIES)
264 error_msg_and_die("Requested switch to unsupported personality "
267 nsyscalls = nsyscall_vec[personality];
268 sysent = sysent_vec[personality];
270 switch (personality) {
272 errnoent = errnoent0;
274 ioctlent = ioctlent0;
275 nioctlents = nioctlents0;
276 signalent = signalent0;
277 nsignals = nsignals0;
278 printers = &printers0;
282 errnoent = errnoent1;
284 ioctlent = ioctlent1;
285 nioctlents = nioctlents1;
286 signalent = signalent1;
287 nsignals = nsignals1;
288 printers = &printers1;
291 # if SUPPORTED_PERSONALITIES > 2
293 errnoent = errnoent2;
295 ioctlent = ioctlent2;
296 nioctlents = nioctlents2;
297 signalent = signalent2;
298 nsignals = nsignals2;
299 printers = &printers2;
304 current_personality = personality;
305 # ifndef current_wordsize
306 current_wordsize = personality_wordsize[personality];
308 # ifndef current_klongsize
309 current_klongsize = personality_klongsize[personality];
314 update_personality(struct tcb *tcp, unsigned int personality)
316 static bool need_mpers_warning[] =
317 { false, !HAVE_PERSONALITY_1_MPERS, !HAVE_PERSONALITY_2_MPERS };
319 set_personality(personality);
321 if (personality == tcp->currpers)
323 tcp->currpers = personality;
326 error_msg("[ Process PID=%d runs in %s mode. ]",
327 tcp->pid, personality_names[personality]);
330 if (need_mpers_warning[personality]) {
331 error_msg("WARNING: Proper structure decoding for this "
332 "personality is not supported, please consider "
333 "building strace with mpers support enabled.");
334 need_mpers_warning[personality] = false;
339 #ifdef SYS_socket_subcall
341 decode_socket_subcall(struct tcb *tcp)
343 const int call = tcp->u_arg[0];
345 if (call < 1 || call >= SYS_socket_nsubcalls)
348 const kernel_ulong_t scno = SYS_socket_subcall + call;
349 const unsigned int nargs = sysent[scno].nargs;
352 if (umoven(tcp, tcp->u_arg[1], nargs * current_wordsize, buf) < 0)
356 tcp->qual_flg = qual_flags(scno);
357 tcp->s_ent = &sysent[scno];
360 for (i = 0; i < nargs; ++i)
361 tcp->u_arg[i] = (sizeof(uint32_t) == current_wordsize)
362 ? ((uint32_t *) (void *) buf)[i] : buf[i];
364 #endif /* SYS_socket_subcall */
366 #ifdef SYS_ipc_subcall
368 decode_ipc_subcall(struct tcb *tcp)
370 unsigned int call = tcp->u_arg[0];
371 const unsigned int version = call >> 16;
374 # if defined S390 || defined S390X
378 if (current_wordsize == 8)
381 set_tcb_priv_ulong(tcp, version);
387 case 1: case 2: case 3: case 4:
388 case 11: case 12: case 13: case 14:
389 case 21: case 22: case 23: case 24:
395 tcp->scno = SYS_ipc_subcall + call;
396 tcp->qual_flg = qual_flags(tcp->scno);
397 tcp->s_ent = &sysent[tcp->scno];
399 const unsigned int n = tcp->s_ent->nargs;
401 for (i = 0; i < n; i++)
402 tcp->u_arg[i] = tcp->u_arg[i + 1];
404 #endif /* SYS_ipc_subcall */
406 #ifdef SYS_syscall_subcall
408 decode_syscall_subcall(struct tcb *tcp)
410 if (!scno_is_valid(tcp->u_arg[0]))
412 tcp->scno = tcp->u_arg[0];
413 tcp->qual_flg = qual_flags(tcp->scno);
414 tcp->s_ent = &sysent[tcp->scno];
415 memmove(&tcp->u_arg[0], &tcp->u_arg[1],
416 sizeof(tcp->u_arg) - sizeof(tcp->u_arg[0]));
417 # ifdef LINUX_MIPSO32
419 * Fetching the last arg of 7-arg syscalls (fadvise64_64
420 * and sync_file_range) requires additional code,
421 * see linux/mips/get_syscall_args.c
423 if (tcp->s_ent->nargs == MAX_ARGS) {
425 mips_REG_SP + MAX_ARGS * sizeof(tcp->u_arg[0]),
426 sizeof(tcp->u_arg[0]),
427 &tcp->u_arg[MAX_ARGS - 1]) < 0)
428 tcp->u_arg[MAX_ARGS - 1] = 0;
430 # endif /* LINUX_MIPSO32 */
432 #endif /* SYS_syscall_subcall */
435 dumpio(struct tcb *tcp)
440 int fd = tcp->u_arg[0];
444 if (is_number_in_set(fd, read_set)) {
445 switch (tcp->s_ent->sen) {
450 case SEN_mq_timedreceive:
451 dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
456 dumpiov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1],
460 dumpiov_in_msghdr(tcp, tcp->u_arg[1], tcp->u_rval);
463 dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
467 if (is_number_in_set(fd, write_set)) {
468 switch (tcp->s_ent->sen) {
473 case SEN_mq_timedsend:
474 dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
480 dumpiov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1], -1);
483 dumpiov_in_msghdr(tcp, tcp->u_arg[1], -1);
486 dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
493 err_name(unsigned long err)
495 if ((err < nerrnos) && errnoent[err])
496 return errnoent[err];
501 static long get_regs(struct tcb *);
502 static int get_syscall_args(struct tcb *);
503 static int get_syscall_result(struct tcb *);
504 static int arch_get_scno(struct tcb *tcp);
505 static int arch_set_scno(struct tcb *, kernel_ulong_t);
506 static void get_error(struct tcb *, const bool);
507 static int arch_set_error(struct tcb *);
508 static int arch_set_success(struct tcb *);
510 struct inject_opts *inject_vec[SUPPORTED_PERSONALITIES];
512 static struct inject_opts *
513 tcb_inject_opts(struct tcb *tcp)
515 return (scno_in_range(tcp->scno) && tcp->inject_vec[current_personality])
516 ? &tcp->inject_vec[current_personality][tcp->scno] : NULL;
521 tamper_with_syscall_entering(struct tcb *tcp, unsigned int *signo)
523 if (!tcp->inject_vec[current_personality]) {
524 tcp->inject_vec[current_personality] =
525 xcalloc(nsyscalls, sizeof(**inject_vec));
526 memcpy(tcp->inject_vec[current_personality],
527 inject_vec[current_personality],
528 nsyscalls * sizeof(**inject_vec));
531 struct inject_opts *opts = tcb_inject_opts(tcp);
533 if (!opts || opts->first == 0)
538 if (opts->first != 0)
541 opts->first = opts->step;
543 if (!recovering(tcp)) {
544 if (opts->data.flags & INJECT_F_SIGNAL)
545 *signo = opts->data.signo;
546 if (opts->data.flags & (INJECT_F_ERROR | INJECT_F_RETVAL) &&
547 !arch_set_scno(tcp, -1))
548 tcp->flags |= TCB_TAMPERED;
549 if (opts->data.flags & INJECT_F_DELAY_ENTER)
550 delay_tcb(tcp, opts->data.delay_idx, true);
551 if (opts->data.flags & INJECT_F_DELAY_EXIT)
552 tcp->flags |= TCB_INJECT_DELAY_EXIT;
559 tamper_with_syscall_exiting(struct tcb *tcp)
561 struct inject_opts *opts = tcb_inject_opts(tcp);
565 if (inject_delay_exit(tcp))
566 delay_tcb(tcp, opts->data.delay_idx, false);
568 if (!syscall_tampered(tcp))
571 if (!syserror(tcp)) {
572 error_msg("Failed to tamper with process %d: got no error "
573 "(return value %#" PRI_klx ")",
574 tcp->pid, tcp->u_rval);
579 bool update_tcb = false;
581 if (opts->data.flags & INJECT_F_RETVAL) {
582 kernel_long_t inject_rval =
583 retval_get(opts->data.rval_idx);
584 kernel_long_t u_rval = tcp->u_rval;
586 tcp->u_rval = inject_rval;
587 if (arch_set_success(tcp)) {
588 tcp->u_rval = u_rval;
594 unsigned long new_error = retval_get(opts->data.rval_idx);
596 if (new_error != tcp->u_error && new_error <= MAX_ERRNO_VALUE) {
597 unsigned long u_error = tcp->u_error;
599 tcp->u_error = new_error;
600 if (arch_set_error(tcp)) {
601 tcp->u_error = u_error;
610 get_error(tcp, !(tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS));
618 * 0: "ignore this ptrace stop", bail out silently.
619 * 1: ok, decoded; call
620 * syscall_entering_finish(tcp, syscall_entering_trace(tcp, ...)).
621 * other: error; call syscall_entering_finish(tcp, res), where res is the value
625 syscall_entering_decode(struct tcb *tcp)
627 int res = get_scno(tcp);
631 if (res != 1 || (res = get_syscall_args(tcp)) != 1) {
633 tprintf("%s(", scno_good == 1 ? tcp->s_ent->sys_name : "????");
635 * " <unavailable>" will be added later by the code which
636 * detects ptrace errors.
641 #if defined SYS_ipc_subcall \
642 || defined SYS_socket_subcall \
643 || defined SYS_syscall_subcall
645 switch (tcp->s_ent->sen) {
646 # ifdef SYS_ipc_subcall
648 decode_ipc_subcall(tcp);
651 # ifdef SYS_socket_subcall
653 decode_socket_subcall(tcp);
656 # ifdef SYS_syscall_subcall
658 decode_syscall_subcall(tcp);
659 if (tcp->s_ent->sen != SEN_syscall)
672 syscall_entering_trace(struct tcb *tcp, unsigned int *sig)
674 /* Restrain from fault injection while the trace executes strace code. */
676 tcp->qual_flg &= ~QUAL_INJECT;
679 switch (tcp->s_ent->sen) {
682 #if defined SPARC || defined SPARC64
685 tcp->flags &= ~TCB_HIDE_LOG;
689 if (!traced(tcp) || (tracing_paths && !pathtrace_match(tcp))) {
690 tcp->flags |= TCB_FILTERED;
694 tcp->flags &= ~TCB_FILTERED;
701 tamper_with_syscall_entering(tcp, sig);
703 if (cflag == CFLAG_ONLY_STATS) {
708 if (stack_trace_enabled) {
709 if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER)
710 unwind_capture_stacktrace(tcp);
715 tprintf("%s(", tcp->s_ent->sys_name);
716 int res = raw(tcp) ? printargs(tcp) : tcp->s_ent->sys_func(tcp);
722 syscall_entering_finish(struct tcb *tcp, int res)
724 tcp->flags |= TCB_INSYSCALL;
725 tcp->sys_func_rval = res;
726 /* Measure the entrance time as late as possible to avoid errors. */
727 if ((Tflag || cflag) && !filtered(tcp))
728 clock_gettime(CLOCK_MONOTONIC, &tcp->etime);
734 * -1: error in one of ptrace ops.
736 * If not 0, call syscall_exiting_trace(tcp, res), where res is the return
737 * value. Anyway, call syscall_exiting_finish(tcp) then.
740 syscall_exiting_decode(struct tcb *tcp, struct timespec *pts)
742 /* Measure the exit time as early as possible to avoid errors. */
743 if ((Tflag || cflag) && !(filtered(tcp) || hide_log(tcp)))
744 clock_gettime(CLOCK_MONOTONIC, pts);
746 if (mmap_cache_is_enabled()) {
747 if (tcp->s_ent->sys_flags & STACKTRACE_INVALIDATE_CACHE)
748 mmap_cache_invalidate(tcp);
751 if (filtered(tcp) || hide_log(tcp))
754 #if SUPPORTED_PERSONALITIES > 1
755 update_personality(tcp, tcp->currpers);
758 return get_syscall_result(tcp);
762 syscall_exiting_trace(struct tcb *tcp, struct timespec *ts, int res)
764 if (syscall_tampered(tcp) || inject_delay_exit(tcp))
765 tamper_with_syscall_exiting(tcp);
768 count_syscall(tcp, ts);
769 if (cflag == CFLAG_ONLY_STATS) {
774 /* If not in -ff mode, and printing_tcp != tcp,
775 * then the log currently does not end with output
776 * of _our syscall entry_, but with something else.
777 * We need to say which syscall's return is this.
779 * Forced reprinting via TCB_REPRINT is used only by
780 * "strace -ff -oLOG test/threaded_execve" corner case.
781 * It's the only case when -ff mode needs reprinting.
783 if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) {
784 tcp->flags &= ~TCB_REPRINT;
786 tprintf("<... %s resumed> ", tcp->s_ent->sys_name);
790 tcp->s_prev_ent = NULL;
792 /* There was error in one of prior ptrace ops */
795 tprints("= ? <unavailable>\n");
799 tcp->s_prev_ent = tcp->s_ent;
803 /* sys_res = printargs(tcp); - but it's nop on sysexit */
805 /* FIXME: not_failing_only (IOW, option -z) is broken:
806 * failure of syscall is known only after syscall return.
807 * Thus we end up with something like this on, say, ENOENT:
808 * open("does_not_exist", O_RDONLY <unfinished ...>
809 * {next syscall decode}
810 * whereas the intended result is that open(...) line
811 * is not shown at all.
813 if (not_failing_only && tcp->u_error)
814 return 0; /* ignore failed syscalls */
815 if (tcp->sys_func_rval & RVAL_DECODED)
816 sys_res = tcp->sys_func_rval;
818 sys_res = tcp->s_ent->sys_func(tcp);
823 unsigned long u_error = tcp->u_error;
827 tprintf("= -1 (errno %lu)", u_error);
829 tprintf("= %#" PRI_klx, tcp->u_rval);
831 if (syscall_tampered(tcp))
832 tprints(" (INJECTED)");
833 } else if (!(sys_res & RVAL_NONE) && u_error) {
834 const char *u_error_str;
837 /* Blocked signals do not interrupt any syscalls.
838 * In this case syscalls don't return ERESTARTfoo codes.
840 * Deadly signals set to SIG_DFL interrupt syscalls
841 * and kill the process regardless of which of the codes below
842 * is returned by the interrupted syscall.
843 * In some cases, kernel forces a kernel-generated deadly
844 * signal to be unblocked and set to SIG_DFL (and thus cause
845 * death) if it is blocked or SIG_IGNed: for example, SIGSEGV
846 * or SIGILL. (The alternative is to leave process spinning
847 * forever on the faulty instruction - not useful).
849 * SIG_IGNed signals and non-deadly signals set to SIG_DFL
850 * (for example, SIGCHLD, SIGWINCH) interrupt syscalls,
851 * but kernel will always restart them.
854 /* Most common type of signal-interrupted syscall exit code.
855 * The system call will be restarted with the same arguments
856 * if SA_RESTART is set; otherwise, it will fail with EINTR.
858 tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)");
861 /* Rare. For example, fork() returns this if interrupted.
862 * SA_RESTART is ignored (assumed set): the restart is unconditional.
864 tprints("= ? ERESTARTNOINTR (To be restarted)");
867 /* pause(), rt_sigsuspend() etc use this code.
868 * SA_RESTART is ignored (assumed not set):
869 * syscall won't restart (will return EINTR instead)
870 * even after signal with SA_RESTART set. However,
871 * after SIG_IGN or SIG_DFL signal it will restart
872 * (thus the name "restart only if has no handler").
874 tprints("= ? ERESTARTNOHAND (To be restarted if no handler)");
876 case ERESTART_RESTARTBLOCK:
877 /* Syscalls like nanosleep(), poll() which can't be
878 * restarted with their original arguments use this
879 * code. Kernel will execute restart_syscall() instead,
880 * which changes arguments before restarting syscall.
881 * SA_RESTART is ignored (assumed not set) similarly
882 * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART
883 * since restart data is saved in "restart block"
884 * in task struct, and if signal handler uses a syscall
885 * which in turn saves another such restart block,
886 * old data is lost and restart becomes impossible)
888 tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)");
891 u_error_str = err_name(u_error);
893 tprintf("= %" PRI_kld " %s (%s)", tcp->u_rval,
894 u_error_str, strerror(u_error));
896 tprintf("= %" PRI_kld " %lu (%s)", tcp->u_rval,
897 u_error, strerror(u_error));
900 if (syscall_tampered(tcp))
901 tprints(" (INJECTED)");
902 if ((sys_res & RVAL_STR) && tcp->auxstr)
903 tprintf(" (%s)", tcp->auxstr);
905 if (sys_res & RVAL_NONE)
908 switch (sys_res & RVAL_MASK) {
910 #if ANY_WORDSIZE_LESS_THAN_KERNEL_LONG
911 if (current_klongsize < sizeof(tcp->u_rval)) {
913 (unsigned int) tcp->u_rval);
917 tprintf("= %#" PRI_klx, tcp->u_rval);
922 print_numeric_long_umask(tcp->u_rval);
925 #if ANY_WORDSIZE_LESS_THAN_KERNEL_LONG
926 if (current_klongsize < sizeof(tcp->u_rval)) {
928 (unsigned int) tcp->u_rval);
932 tprintf("= %" PRI_klu, tcp->u_rval);
938 printfd(tcp, tcp->u_rval);
940 tprintf("= %" PRI_kld, tcp->u_rval);
943 error_msg("invalid rval format");
947 if ((sys_res & RVAL_STR) && tcp->auxstr)
948 tprintf(" (%s)", tcp->auxstr);
949 if (syscall_tampered(tcp))
950 tprints(" (INJECTED)");
953 ts_sub(ts, ts, &tcp->etime);
954 tprintf(" <%ld.%06ld>",
955 (long) ts->tv_sec, (long) ts->tv_nsec / 1000);
962 if (stack_trace_enabled)
963 unwind_print_stacktrace(tcp);
969 syscall_exiting_finish(struct tcb *tcp)
971 tcp->flags &= ~(TCB_INSYSCALL | TCB_TAMPERED | TCB_INJECT_DELAY_EXIT);
972 tcp->sys_func_rval = 0;
973 free_tcb_priv_data(tcp);
977 is_erestart(struct tcb *tcp)
979 switch (tcp->u_error) {
983 case ERESTART_RESTARTBLOCK:
990 static unsigned long saved_u_error;
993 temporarily_clear_syserror(struct tcb *tcp)
995 saved_u_error = tcp->u_error;
1000 restore_cleared_syserror(struct tcb *tcp)
1002 tcp->u_error = saved_u_error;
1005 #include "arch_regs.c"
1007 #if HAVE_ARCH_GETRVAL2
1008 # include "arch_getrval2.c"
1012 print_pc(struct tcb *tcp)
1014 #if defined ARCH_PC_REG
1015 # define ARCH_GET_PC 0
1016 #elif defined ARCH_PC_PEEK_ADDR
1018 # define ARCH_PC_REG pc
1019 # define ARCH_GET_PC upeek(tcp, ARCH_PC_PEEK_ADDR, &pc)
1021 # error Neither ARCH_PC_REG nor ARCH_PC_PEEK_ADDR is defined
1023 if (get_regs(tcp) < 0 || ARCH_GET_PC)
1024 tprints(current_wordsize == 4 ? "[????????] "
1025 : "[????????????????] ");
1027 tprintf(current_wordsize == 4
1028 ? "[%08" PRI_klx "] " : "[%016" PRI_klx "] ",
1029 (kernel_ulong_t) ARCH_PC_REG);
1032 #include "getregs_old.h"
1034 #undef ptrace_getregset_or_getregs
1035 #undef ptrace_setregset_or_setregs
1036 #ifdef ARCH_REGS_FOR_GETREGSET
1038 # define ptrace_getregset_or_getregs ptrace_getregset
1040 ptrace_getregset(pid_t pid)
1042 # ifdef ARCH_IOVEC_FOR_GETREGSET
1043 /* variable iovec */
1044 ARCH_IOVEC_FOR_GETREGSET.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET);
1045 return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS,
1046 &ARCH_IOVEC_FOR_GETREGSET);
1048 /* constant iovec */
1049 static struct iovec io = {
1050 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1051 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1053 return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io);
1058 # ifndef HAVE_GETREGS_OLD
1059 # define ptrace_setregset_or_setregs ptrace_setregset
1061 ptrace_setregset(pid_t pid)
1063 # ifdef ARCH_IOVEC_FOR_GETREGSET
1064 /* variable iovec */
1065 return ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS,
1066 &ARCH_IOVEC_FOR_GETREGSET);
1068 /* constant iovec */
1069 static struct iovec io = {
1070 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1071 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1073 return ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS, &io);
1076 # endif /* !HAVE_GETREGS_OLD */
1078 #elif defined ARCH_REGS_FOR_GETREGS
1080 # define ptrace_getregset_or_getregs ptrace_getregs
1082 ptrace_getregs(pid_t pid)
1084 # if defined SPARC || defined SPARC64
1085 /* SPARC systems have the meaning of data and addr reversed */
1086 return ptrace(PTRACE_GETREGS, pid, (void *) &ARCH_REGS_FOR_GETREGS, 0);
1088 return ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1092 # ifndef HAVE_GETREGS_OLD
1093 # define ptrace_setregset_or_setregs ptrace_setregs
1095 ptrace_setregs(pid_t pid)
1097 # if defined SPARC || defined SPARC64
1098 /* SPARC systems have the meaning of data and addr reversed */
1099 return ptrace(PTRACE_SETREGS, pid, (void *) &ARCH_REGS_FOR_GETREGS, 0);
1101 return ptrace(PTRACE_SETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1104 # endif /* !HAVE_GETREGS_OLD */
1106 #endif /* ARCH_REGS_FOR_GETREGSET || ARCH_REGS_FOR_GETREGS */
1108 #ifdef ptrace_getregset_or_getregs
1109 static long get_regs_error;
1113 clear_regs(struct tcb *tcp)
1115 #ifdef ptrace_getregset_or_getregs
1116 get_regs_error = -1;
1121 get_regs(struct tcb *const tcp)
1123 #ifdef ptrace_getregset_or_getregs
1125 if (get_regs_error != -1)
1126 return get_regs_error;
1128 # ifdef HAVE_GETREGS_OLD
1130 * Try PTRACE_GETREGSET/PTRACE_GETREGS first,
1131 * fallback to getregs_old.
1133 static int use_getregs_old;
1134 if (use_getregs_old < 0) {
1135 return get_regs_error = ptrace_getregset_or_getregs(tcp->pid);
1136 } else if (use_getregs_old == 0) {
1137 get_regs_error = ptrace_getregset_or_getregs(tcp->pid);
1138 if (get_regs_error >= 0) {
1139 use_getregs_old = -1;
1140 return get_regs_error;
1142 if (errno == EPERM || errno == ESRCH)
1143 return get_regs_error;
1144 use_getregs_old = 1;
1146 return get_regs_error = getregs_old(tcp);
1147 # else /* !HAVE_GETREGS_OLD */
1148 /* Assume that PTRACE_GETREGSET/PTRACE_GETREGS works. */
1149 get_regs_error = ptrace_getregset_or_getregs(tcp->pid);
1151 # if defined ARCH_PERSONALITY_0_IOV_SIZE
1153 return get_regs_error;
1155 switch (ARCH_IOVEC_FOR_GETREGSET.iov_len) {
1156 case ARCH_PERSONALITY_0_IOV_SIZE:
1157 update_personality(tcp, 0);
1159 case ARCH_PERSONALITY_1_IOV_SIZE:
1160 update_personality(tcp, 1);
1163 static bool printed = false;
1166 error_msg("Unsupported regset size returned by "
1167 "PTRACE_GETREGSET: %zu",
1168 ARCH_IOVEC_FOR_GETREGSET.iov_len);
1173 update_personality(tcp, 0);
1176 # endif /* ARCH_PERSONALITY_0_IOV_SIZE */
1178 return get_regs_error;
1180 # endif /* !HAVE_GETREGS_OLD */
1182 #else /* !ptrace_getregset_or_getregs */
1184 # warning get_regs is not implemented for this architecture yet
1187 #endif /* !ptrace_getregset_or_getregs */
1190 #ifdef ptrace_setregset_or_setregs
1194 return ptrace_setregset_or_setregs(pid);
1196 #endif /* ptrace_setregset_or_setregs */
1201 char buf[sizeof("syscall_0x") + sizeof(kernel_ulong_t) * 2];
1205 free_sysent_buf(void *ptr)
1207 struct sysent_buf *s = ptr;
1208 s->tcp->s_prev_ent = s->tcp->s_ent = NULL;
1214 * 0: "ignore this ptrace stop", syscall_entering_decode() should return a "bail
1215 * out silently" code.
1216 * 1: ok, continue in syscall_entering_decode().
1217 * other: error, syscall_entering_decode() should print error indicator
1218 * ("????" etc) and return an appropriate code.
1221 get_scno(struct tcb *tcp)
1223 if (get_regs(tcp) < 0)
1226 int rc = arch_get_scno(tcp);
1230 tcp->scno = shuffle_scno(tcp->scno);
1232 if (scno_is_valid(tcp->scno)) {
1233 tcp->s_ent = &sysent[tcp->scno];
1234 tcp->qual_flg = qual_flags(tcp->scno);
1236 struct sysent_buf *s = xcalloc(1, sizeof(*s));
1239 s->ent.nargs = MAX_ARGS;
1240 s->ent.sen = SEN_printargs;
1241 s->ent.sys_func = printargs;
1242 s->ent.sys_name = s->buf;
1243 xsprintf(s->buf, "syscall_%#" PRI_klx, shuffle_scno(tcp->scno));
1245 tcp->s_ent = &s->ent;
1246 tcp->qual_flg = QUAL_RAW | DEFAULT_QUAL_FLAGS;
1248 set_tcb_priv_data(tcp, s, free_sysent_buf);
1250 debug_msg("pid %d invalid syscall %#" PRI_klx,
1251 tcp->pid, shuffle_scno(tcp->scno));
1255 * We refrain from argument decoding during recovering
1256 * as tracee memory mappings has changed and the registers
1257 * are very likely pointing to garbage already.
1259 if (recovering(tcp))
1260 tcp->qual_flg |= QUAL_RAW;
1265 #ifdef ptrace_getregset_or_getregs
1266 # define get_syscall_result_regs get_regs
1268 static int get_syscall_result_regs(struct tcb *);
1272 * 1: ok, continue in syscall_exiting_trace().
1273 * -1: error, syscall_exiting_trace() should print error indicator
1274 * ("????" etc) and bail out.
1277 get_syscall_result(struct tcb *tcp)
1279 if (get_syscall_result_regs(tcp) < 0)
1283 !(tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS)
1284 || syscall_tampered(tcp));
1289 #include "get_scno.c"
1290 #include "set_scno.c"
1291 #include "get_syscall_args.c"
1292 #ifndef ptrace_getregset_or_getregs
1293 # include "get_syscall_result.c"
1295 #include "get_error.c"
1296 #include "set_error.c"
1297 #ifdef HAVE_GETREGS_OLD
1298 # include "getregs_old.c"
1300 #include "shuffle_scno.c"
1303 syscall_name(kernel_ulong_t scno)
1305 return scno_is_valid(scno) ? sysent[scno].sys_name : NULL;