granicus.if.org Git - strace/blob - printsiginfo.c

   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) 1993-1996 Rick Sladkey <jrs@world.std.com>
   5  * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
   6  * Copyright (c) 2001 John Hughes <john@Calva.COM>
   7  * Copyright (c) 2013 Denys Vlasenko <vda.linux@googlemail.com>
   8  * Copyright (c) 2011-2015 Dmitry V. Levin <ldv@altlinux.org>
   9  * Copyright (c) 2015 Elvira Khabirova <lineprinter0@gmail.com>
  10  * Copyright (c) 2015-2018 The strace developers.
  11  * All rights reserved.
  12  *
  13  * SPDX-License-Identifier: LGPL-2.1-or-later
  14  */
  15
  16 #include "defs.h"
  17
  18 #include DEF_MPERS_TYPE(siginfo_t)
  19
  20 #include <signal.h>
  21 #include <linux/audit.h>
  22
  23 #include MPERS_DEFS
  24
  25 #include "nr_prefix.c"
  26
  27 #include "print_fields.h"
  28
  29 #ifndef IN_MPERS
  30 # include "printsiginfo.h"
  31 #endif
  32
  33 #define XLAT_MACROS_ONLY
  34 /* For xlat/audit_arch.h */
  35 # include "xlat/elf_em.h"
  36 #undef XLAT_MACROS_ONLY
  37
  38 #include "xlat/audit_arch.h"
  39 #include "xlat/sigbus_codes.h"
  40 #include "xlat/sigchld_codes.h"
  41 #include "xlat/sigfpe_codes.h"
  42 #include "xlat/sigill_codes.h"
  43 #include "xlat/siginfo_codes.h"
  44 #include "xlat/sigpoll_codes.h"
  45 #include "xlat/sigprof_codes.h"
  46 #include "xlat/sigsegv_codes.h"
  47 #include "xlat/sigsys_codes.h"
  48 #include "xlat/sigtrap_codes.h"
  49
  50 #ifdef SIGEMT
  51 # include "xlat/sigemt_codes.h"
  52 #endif
  53
  54 #ifndef SI_FROMUSER
  55 # define SI_FROMUSER(sip)       ((sip)->si_code <= 0)
  56 #endif
  57
  58 static void
  59 printsigsource(const siginfo_t *sip)
  60 {
  61         tprintf(", si_pid=%u, si_uid=%u",
  62                 (unsigned int) sip->si_pid,
  63                 (unsigned int) sip->si_uid);
  64 }
  65
  66 static void
  67 printsigval(const siginfo_t *sip)
  68 {
  69         tprintf(", si_value={int=%d, ptr=", sip->si_int);
  70         printaddr(ptr_to_kulong(sip->si_ptr));
  71         tprints("}");
  72 }
  73
  74 static void
  75 print_si_code(int si_signo, unsigned int si_code)
  76 {
  77         const char *code = xlookup(siginfo_codes, si_code);
  78
  79         if (!code) {
  80                 switch (si_signo) {
  81                 case SIGTRAP:
  82                         code = xlookup(sigtrap_codes, si_code);
  83                         break;
  84                 case SIGCHLD:
  85                         code = xlookup(sigchld_codes, si_code);
  86                         break;
  87                 case SIGPOLL:
  88                         code = xlookup(sigpoll_codes, si_code);
  89                         break;
  90                 case SIGPROF:
  91                         code = xlookup(sigprof_codes, si_code);
  92                         break;
  93                 case SIGILL:
  94                         code = xlookup(sigill_codes, si_code);
  95                         break;
  96 #ifdef SIGEMT
  97                 case SIGEMT:
  98                         code = xlookup(sigemt_codes, si_code);
  99                         break;
 100 #endif
 101                 case SIGFPE:
 102                         code = xlookup(sigfpe_codes, si_code);
 103                         break;
 104                 case SIGSEGV:
 105                         code = xlookup(sigsegv_codes, si_code);
 106                         break;
 107                 case SIGBUS:
 108                         code = xlookup(sigbus_codes, si_code);
 109                         break;
 110                 case SIGSYS:
 111                         code = xlookup(sigsys_codes, si_code);
 112                         break;
 113                 }
 114         }
 115
 116         print_xlat_ex(si_code, code, XLAT_STYLE_DEFAULT);
 117 }
 118
 119 static void
 120 print_si_info(const siginfo_t *sip)
 121 {
 122         if (sip->si_errno)
 123                 PRINT_FIELD_ERR_U(", ", *sip, si_errno);
 124
 125         if (SI_FROMUSER(sip)) {
 126                 switch (sip->si_code) {
 127                 case SI_USER:
 128                         printsigsource(sip);
 129                         break;
 130                 case SI_TKILL:
 131                         printsigsource(sip);
 132                         break;
 133 #if defined HAVE_SIGINFO_T_SI_TIMERID && defined HAVE_SIGINFO_T_SI_OVERRUN
 134                 case SI_TIMER:
 135                         tprintf(", si_timerid=%#x, si_overrun=%d",
 136                                 sip->si_timerid, sip->si_overrun);
 137                         printsigval(sip);
 138                         break;
 139 #endif
 140                 default:
 141                         printsigsource(sip);
 142                         if (sip->si_ptr)
 143                                 printsigval(sip);
 144                         break;
 145                 }
 146         } else {
 147                 switch (sip->si_signo) {
 148                 case SIGCHLD:
 149                         printsigsource(sip);
 150                         tprints(", si_status=");
 151                         if (sip->si_code == CLD_EXITED)
 152                                 tprintf("%d", sip->si_status);
 153                         else
 154                                 printsignal(sip->si_status);
 155                         tprintf(", si_utime=%llu, si_stime=%llu",
 156                                 zero_extend_signed_to_ull(sip->si_utime),
 157                                 zero_extend_signed_to_ull(sip->si_stime));
 158                         break;
 159                 case SIGILL: case SIGFPE:
 160                 case SIGSEGV: case SIGBUS:
 161                         tprints(", si_addr=");
 162                         printaddr(ptr_to_kulong(sip->si_addr));
 163                         break;
 164                 case SIGPOLL:
 165                         switch (sip->si_code) {
 166                         case POLL_IN: case POLL_OUT: case POLL_MSG:
 167                                 tprintf(", si_band=%ld",
 168                                         (long) sip->si_band);
 169                                 break;
 170                         }
 171                         break;
 172 #ifdef HAVE_SIGINFO_T_SI_SYSCALL
 173                 case SIGSYS: {
 174                         /*
 175                          * Note that we can safely use the personlity set in
 176                          * current_personality  here (and don't have to guess it
 177                          * based on X32_SYSCALL_BIT and si_arch, for example):
 178                          *  - The signal is delivered as a result of seccomp
 179                          *    filtering to the process executing forbidden
 180                          *    syscall.
 181                          *  - We have set the personality for the tracee during
 182                          *    the syscall entering.
 183                          *  - The current_personality is reliably switched in
 184                          *    the next_event routine, it is set to the
 185                          *    personality of the last call made (the one that
 186                          *    triggered the signal delivery).
 187                          *  - Looks like there are no other cases where SIGSYS
 188                          *    is delivered from the kernel so far.
 189                          */
 190                         const char *scname = syscall_name(shuffle_scno(
 191                                 (unsigned) sip->si_syscall));
 192
 193                         tprints(", si_call_addr=");
 194                         printaddr(ptr_to_kulong(sip->si_call_addr));
 195                         tprints(", si_syscall=");
 196                         if (scname)
 197                                 tprintf("%s%s",
 198                                         nr_prefix(sip->si_syscall), scname);
 199                         else
 200                                 tprintf("%u", (unsigned) sip->si_syscall);
 201                         tprints(", si_arch=");
 202                         printxval(audit_arch, sip->si_arch, "AUDIT_ARCH_???");
 203                         break;
 204                 }
 205 #endif
 206                 default:
 207                         if (sip->si_pid || sip->si_uid)
 208                                 printsigsource(sip);
 209                         if (sip->si_ptr)
 210                                 printsigval(sip);
 211                 }
 212         }
 213 }
 214
 215 #ifdef IN_MPERS
 216 static
 217 #endif
 218 void
 219 printsiginfo(const siginfo_t *sip)
 220 {
 221         if (sip->si_signo == 0) {
 222                 tprints("{}");
 223                 return;
 224         }
 225         tprints("{si_signo=");
 226         printsignal(sip->si_signo);
 227
 228         tprints(", si_code=");
 229         print_si_code(sip->si_signo, sip->si_code);
 230
 231 #ifdef SI_NOINFO
 232         if (sip->si_code != SI_NOINFO)
 233 #endif
 234                 print_si_info(sip);
 235
 236         tprints("}");
 237 }
 238
 239 MPERS_PRINTER_DECL(void, printsiginfo_at,
 240                    struct tcb *const tcp, const kernel_ulong_t addr)
 241 {
 242         siginfo_t si;
 243
 244         if (!umove_or_printaddr(tcp, addr, &si))
 245                 printsiginfo(&si);
 246 }
 247
 248 static bool
 249 print_siginfo_t(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
 250 {
 251         printsiginfo((const siginfo_t *) elem_buf);
 252         return true;
 253 }
 254
 255 MPERS_PRINTER_DECL(void, print_siginfo_array, struct tcb *const tcp,
 256                    const kernel_ulong_t addr, const kernel_ulong_t len)
 257 {
 258         siginfo_t si;
 259
 260         print_array(tcp, addr, len, &si, sizeof(si),
 261                     tfetch_mem, print_siginfo_t, 0);
 262 }