libsanitizer/asan/asan_posix.cc

   1 //===-- asan_posix.cc -----------------------------------------------------===//
   2 //
   3 // This file is distributed under the University of Illinois Open Source
   4 // License. See LICENSE.TXT for details.
   5 //
   6 //===----------------------------------------------------------------------===//
   7 //
   8 // This file is a part of AddressSanitizer, an address sanity checker.
   9 //
  10 // Posix-specific details.
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "sanitizer_common/sanitizer_platform.h"
  14 #if SANITIZER_POSIX
  15
  16 #include "asan_internal.h"
  17 #include "asan_interceptors.h"
  18 #include "asan_mapping.h"
  19 #include "asan_report.h"
  20 #include "asan_stack.h"
  21 #include "sanitizer_common/sanitizer_libc.h"
  22 #include "sanitizer_common/sanitizer_procmaps.h"
  23
  24 #include <pthread.h>
  25 #include <signal.h>
  26 #include <stdlib.h>
  27 #include <sys/time.h>
  28 #include <sys/resource.h>
  29 #include <unistd.h>
  30
  31 namespace __asan {
  32
  33 void AsanOnSIGSEGV(int, void *siginfo, void *context) {
  34   uptr addr = (uptr)((siginfo_t*)siginfo)->si_addr;
  35   int code = (int)((siginfo_t*)siginfo)->si_code;
  36   // Write the first message using the bullet-proof write.
  37   if (13 != internal_write(2, "ASAN:SIGSEGV\n", 13)) Die();
  38   uptr pc, sp, bp;
  39   GetPcSpBp(context, &pc, &sp, &bp);
  40
  41   // Access at a reasonable offset above SP, or slightly below it (to account
  42   // for x86_64 redzone, ARM push of multiple registers, etc) is probably a
  43   // stack overflow.
  44   // We also check si_code to filter out SEGV caused by something else other
  45   // then hitting the guard page or unmapped memory, like, for example,
  46   // unaligned memory access.
  47   if (addr + 128 > sp && addr < sp + 0xFFFF &&
  48       (code == si_SEGV_MAPERR || code == si_SEGV_ACCERR))
  49     ReportStackOverflow(pc, sp, bp, context, addr);
  50   else
  51     ReportSIGSEGV(pc, sp, bp, context, addr);
  52 }
  53
  54 // ---------------------- TSD ---------------- {{{1
  55
  56 static pthread_key_t tsd_key;
  57 static bool tsd_key_inited = false;
  58 void AsanTSDInit(void (*destructor)(void *tsd)) {
  59   CHECK(!tsd_key_inited);
  60   tsd_key_inited = true;
  61   CHECK_EQ(0, pthread_key_create(&tsd_key, destructor));
  62 }
  63
  64 void *AsanTSDGet() {
  65   CHECK(tsd_key_inited);
  66   return pthread_getspecific(tsd_key);
  67 }
  68
  69 void AsanTSDSet(void *tsd) {
  70   CHECK(tsd_key_inited);
  71   pthread_setspecific(tsd_key, tsd);
  72 }
  73
  74 void PlatformTSDDtor(void *tsd) {
  75   AsanThreadContext *context = (AsanThreadContext*)tsd;
  76   if (context->destructor_iterations > 1) {
  77     context->destructor_iterations--;
  78     CHECK_EQ(0, pthread_setspecific(tsd_key, tsd));
  79     return;
  80   }
  81   AsanThread::TSDDtor(tsd);
  82 }
  83 }  // namespace __asan
  84
  85 #endif  // SANITIZER_POSIX