lib/asan/asan_posix.cc

   1 //===-- asan_posix.cc -----------------------------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file is a part of AddressSanitizer, an address sanity checker.
  11 //
  12 // Posix-specific details.
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "sanitizer_common/sanitizer_platform.h"
  16 #if SANITIZER_POSIX
  17
  18 #include "asan_internal.h"
  19 #include "asan_interceptors.h"
  20 #include "asan_mapping.h"
  21 #include "asan_report.h"
  22 #include "asan_stack.h"
  23 #include "sanitizer_common/sanitizer_libc.h"
  24 #include "sanitizer_common/sanitizer_procmaps.h"
  25
  26 #include <pthread.h>
  27 #include <signal.h>
  28 #include <stdlib.h>
  29 #include <sys/time.h>
  30 #include <sys/resource.h>
  31 #include <unistd.h>
  32
  33 namespace __asan {
  34
  35 void AsanOnSIGSEGV(int, void *siginfo, void *context) {
  36   uptr addr = (uptr)((siginfo_t*)siginfo)->si_addr;
  37   int code = (int)((siginfo_t*)siginfo)->si_code;
  38   // Write the first message using the bullet-proof write.
  39   if (13 != internal_write(2, "ASAN:SIGSEGV\n", 13)) Die();
  40   uptr pc, sp, bp;
  41   GetPcSpBp(context, &pc, &sp, &bp);
  42
  43   // Access at a reasonable offset above SP, or slightly below it (to account
  44   // for x86_64 redzone, ARM push of multiple registers, etc) is probably a
  45   // stack overflow.
  46   // We also check si_code to filter out SEGV caused by something else other
  47   // then hitting the guard page or unmapped memory, like, for example,
  48   // unaligned memory access.
  49   if (addr + 128 > sp && addr < sp + 0xFFFF &&
  50       (code == si_SEGV_MAPERR || code == si_SEGV_ACCERR))
  51     ReportStackOverflow(pc, sp, bp, context, addr);
  52   else
  53     ReportSIGSEGV("SEGV", pc, sp, bp, context, addr);
  54 }
  55
  56 // ---------------------- TSD ---------------- {{{1
  57
  58 static pthread_key_t tsd_key;
  59 static bool tsd_key_inited = false;
  60 void AsanTSDInit(void (*destructor)(void *tsd)) {
  61   CHECK(!tsd_key_inited);
  62   tsd_key_inited = true;
  63   CHECK_EQ(0, pthread_key_create(&tsd_key, destructor));
  64 }
  65
  66 void *AsanTSDGet() {
  67   CHECK(tsd_key_inited);
  68   return pthread_getspecific(tsd_key);
  69 }
  70
  71 void AsanTSDSet(void *tsd) {
  72   CHECK(tsd_key_inited);
  73   pthread_setspecific(tsd_key, tsd);
  74 }
  75
  76 void PlatformTSDDtor(void *tsd) {
  77   AsanThreadContext *context = (AsanThreadContext*)tsd;
  78   if (context->destructor_iterations > 1) {
  79     context->destructor_iterations--;
  80     CHECK_EQ(0, pthread_setspecific(tsd_key, tsd));
  81     return;
  82   }
  83   AsanThread::TSDDtor(tsd);
  84 }
  85 }  // namespace __asan
  86
  87 #endif  // SANITIZER_POSIX