e2fsck/sigcatcher.c

   1 /*
   2  * sigcatcher.c --- print a backtrace on a SIGSEGV, et. al
   3  *
   4  * Copyright (C) 2011 Theodore Ts'o.
   5  *
   6  * %Begin-Header%
   7  * This file may be redistributed under the terms of the GNU Public
   8  * License.
   9  * %End-Header%
  10  */
  11
  12 #include "config.h"
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <signal.h>
  16 #include <string.h>
  17 #ifdef HAVE_EXECINFO_H
  18 #include <execinfo.h>
  19 #endif
  20
  21 #include "e2fsck.h"
  22
  23 struct str_table {
  24         int     num;
  25         const char      *name;
  26 };
  27
  28 #define DEFINE_ENTRY(SYM)       { SYM, #SYM },
  29 #define END_TABLE               { 0, 0 }
  30
  31 static struct str_table sig_table[] = {
  32 #ifdef SIGHUP
  33         DEFINE_ENTRY(SIGHUP)
  34 #endif
  35 #ifdef SIGINT
  36         DEFINE_ENTRY(SIGINT)
  37 #endif
  38 #ifdef SIGQUIT
  39         DEFINE_ENTRY(SIGQUIT)
  40 #endif
  41 #ifdef SIGILL
  42         DEFINE_ENTRY(SIGILL)
  43 #endif
  44 #ifdef SIGTRAP
  45         DEFINE_ENTRY(SIGTRAP)
  46 #endif
  47 #ifdef SIGABRT
  48         DEFINE_ENTRY(SIGABRT)
  49 #endif
  50 #ifdef SIGIOT
  51         DEFINE_ENTRY(SIGIOT)
  52 #endif
  53 #ifdef SIGBUS
  54         DEFINE_ENTRY(SIGBUS)
  55 #endif
  56 #ifdef SIGFPE
  57         DEFINE_ENTRY(SIGFPE)
  58 #endif
  59 #ifdef SIGKILL
  60         DEFINE_ENTRY(SIGKILL)
  61 #endif
  62 #ifdef SIGUSR1
  63         DEFINE_ENTRY(SIGUSR1)
  64 #endif
  65 #ifdef SIGSEGV
  66         DEFINE_ENTRY(SIGSEGV)
  67 #endif
  68 #ifdef SIGUSR2
  69         DEFINE_ENTRY(SIGUSR2)
  70 #endif
  71 #ifdef SIGPIPE
  72         DEFINE_ENTRY(SIGPIPE)
  73 #endif
  74 #ifdef SIGALRM
  75         DEFINE_ENTRY(SIGALRM)
  76 #endif
  77 #ifdef SIGTERM
  78         DEFINE_ENTRY(SIGTERM)
  79 #endif
  80 #ifdef SIGSTKFLT
  81         DEFINE_ENTRY(SIGSTKFLT)
  82 #endif
  83 #ifdef SIGCHLD
  84         DEFINE_ENTRY(SIGCHLD)
  85 #endif
  86 #ifdef SIGCONT
  87         DEFINE_ENTRY(SIGCONT)
  88 #endif
  89 #ifdef SIGSTOP
  90         DEFINE_ENTRY(SIGSTOP)
  91 #endif
  92 #ifdef SIGTSTP
  93         DEFINE_ENTRY(SIGTSTP)
  94 #endif
  95 #ifdef SIGTTIN
  96         DEFINE_ENTRY(SIGTTIN)
  97 #endif
  98 #ifdef SIGTTOU
  99         DEFINE_ENTRY(SIGTTOU)
 100 #endif
 101 #ifdef SIGURG
 102         DEFINE_ENTRY(SIGURG)
 103 #endif
 104 #ifdef SIGXCPU
 105         DEFINE_ENTRY(SIGXCPU)
 106 #endif
 107 #ifdef SIGXFSZ
 108         DEFINE_ENTRY(SIGXFSZ)
 109 #endif
 110 #ifdef SIGVTALRM
 111         DEFINE_ENTRY(SIGVTALRM)
 112 #endif
 113 #ifdef SIGPROF
 114         DEFINE_ENTRY(SIGPROF)
 115 #endif
 116 #ifdef SIGWINCH
 117         DEFINE_ENTRY(SIGWINCH)
 118 #endif
 119 #ifdef SIGIO
 120         DEFINE_ENTRY(SIGIO)
 121 #endif
 122 #ifdef SIGPOLL
 123         DEFINE_ENTRY(SIGPOLL)
 124 #endif
 125 #ifdef SIGPWR
 126         DEFINE_ENTRY(SIGPWR)
 127 #endif
 128 #ifdef SIGSYS
 129         DEFINE_ENTRY(SIGSYS)
 130 #endif
 131         END_TABLE
 132 };
 133
 134 static struct str_table generic_code_table[] = {
 135 #ifdef SI_ASYNCNL
 136         DEFINE_ENTRY(SI_ASYNCNL)
 137 #endif
 138 #ifdef SI_TKILL
 139         DEFINE_ENTRY(SI_TKILL)
 140 #endif
 141 #ifdef SI_SIGIO
 142         DEFINE_ENTRY(SI_SIGIO)
 143 #endif
 144 #ifdef SI_ASYNCIO
 145         DEFINE_ENTRY(SI_ASYNCIO)
 146 #endif
 147 #ifdef SI_MESGQ
 148         DEFINE_ENTRY(SI_MESGQ)
 149 #endif
 150 #ifdef SI_TIMER
 151         DEFINE_ENTRY(SI_TIMER)
 152 #endif
 153 #ifdef SI_QUEUE
 154         DEFINE_ENTRY(SI_QUEUE)
 155 #endif
 156 #ifdef SI_USER
 157         DEFINE_ENTRY(SI_USER)
 158 #endif
 159 #ifdef SI_KERNEL
 160         DEFINE_ENTRY(SI_KERNEL)
 161 #endif
 162         END_TABLE
 163 };
 164
 165 static struct str_table sigill_code_table[] = {
 166 #ifdef ILL_ILLOPC
 167         DEFINE_ENTRY(ILL_ILLOPC)
 168 #endif
 169 #ifdef ILL_ILLOPN
 170         DEFINE_ENTRY(ILL_ILLOPN)
 171 #endif
 172 #ifdef ILL_ILLADR
 173         DEFINE_ENTRY(ILL_ILLADR)
 174 #endif
 175 #ifdef ILL_ILLTRP
 176         DEFINE_ENTRY(ILL_ILLTRP)
 177 #endif
 178 #ifdef ILL_PRVOPC
 179         DEFINE_ENTRY(ILL_PRVOPC)
 180 #endif
 181 #ifdef ILL_PRVREG
 182         DEFINE_ENTRY(ILL_PRVREG)
 183 #endif
 184 #ifdef ILL_COPROC
 185         DEFINE_ENTRY(ILL_COPROC)
 186 #endif
 187 #ifdef ILL_BADSTK
 188         DEFINE_ENTRY(ILL_BADSTK)
 189 #endif
 190 #ifdef BUS_ADRALN
 191         DEFINE_ENTRY(BUS_ADRALN)
 192 #endif
 193 #ifdef BUS_ADRERR
 194         DEFINE_ENTRY(BUS_ADRERR)
 195 #endif
 196 #ifdef BUS_OBJERR
 197         DEFINE_ENTRY(BUS_OBJERR)
 198 #endif
 199         END_TABLE
 200 };
 201
 202 static struct str_table sigfpe_code_table[] = {
 203 #ifdef FPE_INTDIV
 204         DEFINE_ENTRY(FPE_INTDIV)
 205 #endif
 206 #ifdef FPE_INTOVF
 207         DEFINE_ENTRY(FPE_INTOVF)
 208 #endif
 209 #ifdef FPE_FLTDIV
 210         DEFINE_ENTRY(FPE_FLTDIV)
 211 #endif
 212 #ifdef FPE_FLTOVF
 213         DEFINE_ENTRY(FPE_FLTOVF)
 214 #endif
 215 #ifdef FPE_FLTUND
 216         DEFINE_ENTRY(FPE_FLTUND)
 217 #endif
 218 #ifdef FPE_FLTRES
 219         DEFINE_ENTRY(FPE_FLTRES)
 220 #endif
 221 #ifdef FPE_FLTINV
 222         DEFINE_ENTRY(FPE_FLTINV)
 223 #endif
 224 #ifdef FPE_FLTSUB
 225         DEFINE_ENTRY(FPE_FLTSUB)
 226 #endif
 227         END_TABLE
 228 };
 229
 230 static struct str_table sigsegv_code_table[] = {
 231 #ifdef SEGV_MAPERR
 232         DEFINE_ENTRY(SEGV_MAPERR)
 233 #endif
 234 #ifdef SEGV_ACCERR
 235         DEFINE_ENTRY(SEGV_ACCERR)
 236 #endif
 237         END_TABLE
 238 };
 239
 240
 241 static struct str_table sigbus_code_table[] = {
 242 #ifdef BUS_ADRALN
 243         DEFINE_ENTRY(BUS_ADRALN)
 244 #endif
 245 #ifdef BUS_ADRERR
 246         DEFINE_ENTRY(BUS_ADRERR)
 247 #endif
 248 #ifdef BUS_OBJERR
 249         DEFINE_ENTRY(BUS_OBJERR)
 250 #endif
 251         END_TABLE
 252 };
 253
 254 static struct str_table sigstrap_code_table[] = {
 255 #ifdef TRAP_BRKPT
 256         DEFINE_ENTRY(TRAP_BRKPT)
 257 #endif
 258 #ifdef TRAP_TRACE
 259         DEFINE_ENTRY(TRAP_TRACE)
 260 #endif
 261         END_TABLE
 262 };
 263
 264 static struct str_table sigcld_code_table[] = {
 265 #ifdef CLD_EXITED
 266         DEFINE_ENTRY(CLD_EXITED)
 267 #endif
 268 #ifdef CLD_KILLED
 269         DEFINE_ENTRY(CLD_KILLED)
 270 #endif
 271 #ifdef CLD_DUMPED
 272         DEFINE_ENTRY(CLD_DUMPED)
 273 #endif
 274 #ifdef CLD_TRAPPED
 275         DEFINE_ENTRY(CLD_TRAPPED)
 276 #endif
 277 #ifdef CLD_STOPPED
 278         DEFINE_ENTRY(CLD_STOPPED)
 279 #endif
 280 #ifdef CLD_CONTINUED
 281         DEFINE_ENTRY(CLD_CONTINUED)
 282 #endif
 283         END_TABLE
 284 };
 285
 286 static struct str_table sigpoll_code_table[] = {
 287 #ifdef POLL_IN
 288         DEFINE_ENTRY(POLL_IN)
 289 #endif
 290 #ifdef POLL_OUT
 291         DEFINE_ENTRY(POLL_OUT)
 292 #endif
 293 #ifdef POLL_MSG
 294         DEFINE_ENTRY(POLL_MSG)
 295 #endif
 296 #ifdef POLL_ERR
 297         DEFINE_ENTRY(POLL_ERR)
 298 #endif
 299 #ifdef POLL_PRI
 300         DEFINE_ENTRY(POLL_PRI)
 301 #endif
 302 #ifdef POLL_HUP
 303         DEFINE_ENTRY(POLL_HUP)
 304 #endif
 305         END_TABLE
 306 };
 307
 308 static const char *lookup_table(int num, struct str_table *table)
 309 {
 310         struct str_table *p;
 311
 312         for (p=table; p->name; p++)
 313                 if (num == p->num)
 314                         return(p->name);
 315         return NULL;
 316 }
 317
 318 static const char *lookup_table_fallback(int num, struct str_table *table)
 319 {
 320         static char buf[32];
 321         const char *ret = lookup_table(num, table);
 322
 323         if (ret)
 324                 return ret;
 325         snprintf(buf, sizeof(buf), "%d", num);
 326         buf[sizeof(buf)-1] = 0;
 327         return buf;
 328 }
 329
 330 static void die_signal_handler(int signum, siginfo_t *siginfo, void *context)
 331 {
 332        void *stack_syms[32];
 333        int frames;
 334        const char *cp;
 335
 336        fprintf(stderr, "Signal (%d) %s ", signum,
 337                lookup_table_fallback(signum, sig_table));
 338        if (siginfo->si_code == SI_USER)
 339                fprintf(stderr, "(sent from pid %u) ", siginfo->si_pid);
 340        cp = lookup_table(siginfo->si_code, generic_code_table);
 341        if (cp)
 342                fprintf(stderr, "si_code=%s ", cp);
 343        else if (signum == SIGILL)
 344                fprintf(stderr, "si_code=%s ",
 345                        lookup_table_fallback(siginfo->si_code,
 346                                              sigill_code_table));
 347        else if (signum == SIGFPE)
 348                fprintf(stderr, "si_code=%s ",
 349                        lookup_table_fallback(siginfo->si_code,
 350                                              sigfpe_code_table));
 351        else if (signum == SIGSEGV)
 352                fprintf(stderr, "si_code=%s ",
 353                        lookup_table_fallback(siginfo->si_code,
 354                                              sigsegv_code_table));
 355        else if (signum == SIGBUS)
 356                fprintf(stderr, "si_code=%s ",
 357                        lookup_table_fallback(siginfo->si_code,
 358                                              sigbus_code_table));
 359        else if (signum == SIGCHLD)
 360                fprintf(stderr, "si_code=%s ",
 361                        lookup_table_fallback(siginfo->si_code,
 362                                              sigcld_code_table));
 363        else
 364                fprintf(stderr, "si code=%d ", siginfo->si_code);
 365        if ((siginfo->si_code != SI_USER) &&
 366            (signum == SIGILL || signum == SIGFPE ||
 367             signum == SIGSEGV || signum == SIGBUS))
 368                fprintf(stderr, "fault addr=%p", siginfo->si_addr);
 369        fprintf(stderr, "\n");
 370
 371 #ifdef HAVE_BACKTRACE
 372        frames = backtrace(stack_syms, 32);
 373        backtrace_symbols_fd(stack_syms, frames, 2);
 374 #endif
 375        exit(FSCK_ERROR);
 376 }
 377
 378 void sigcatcher_setup(void)
 379 {
 380         struct sigaction        sa;
 381
 382         memset(&sa, 0, sizeof(struct sigaction));
 383         sa.sa_sigaction = die_signal_handler;
 384         sa.sa_flags = SA_SIGINFO;
 385
 386         sigaction(SIGFPE, &sa, 0);
 387         sigaction(SIGILL, &sa, 0);
 388         sigaction(SIGBUS, &sa, 0);
 389         sigaction(SIGSEGV, &sa, 0);
 390         sigaction(SIGABRT, &sa, 0);
 391 }
 392
 393
 394 #ifdef DEBUG
 395 #include <getopt.h>
 396
 397 void usage(void)
 398 {
 399         fprintf(stderr, "tst_sigcatcher: [-akfn]\n");
 400         exit(1);
 401 }
 402
 403 int main(int argc, char** argv)
 404 {
 405         struct sigaction        sa;
 406         char                    *p = 0;
 407         int                     i, c;
 408         volatile                x=0;
 409
 410         memset(&sa, 0, sizeof(struct sigaction));
 411         sa.sa_sigaction = die_signal_handler;
 412         sa.sa_flags = SA_SIGINFO;
 413         for (i=1; i < 31; i++)
 414                 sigaction(i, &sa, 0);
 415
 416         while ((c = getopt (argc, argv, "afkn")) != EOF)
 417                 switch (c) {
 418                 case 'a':
 419                         abort();
 420                         break;
 421                 case 'f':
 422                         printf("%d\n", 42/x);
 423                 case 'k':
 424                         kill(getpid(), SIGTERM);
 425                         break;
 426                 case 'n':
 427                         *p = 42;
 428                 default:
 429                         usage ();
 430                 }
 431
 432         printf("Sleeping for 10 seconds, send kill signal to pid %u...\n",
 433                getpid());
 434         fflush(stdout);
 435         sleep(10);
 436         exit(0);
 437 }
 438 #endif