libsanitizer/asan/asan_stack.h

   1 //===-- asan_stack.h --------------------------------------------*- C++ -*-===//
   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 // ASan-private header for asan_stack.cc.
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef ASAN_STACK_H
  14 #define ASAN_STACK_H
  15
  16 #include "asan_flags.h"
  17 #include "asan_thread.h"
  18 #include "sanitizer_common/sanitizer_flags.h"
  19 #include "sanitizer_common/sanitizer_stacktrace.h"
  20
  21 namespace __asan {
  22
  23 static const u32 kDefaultMallocContextSize = 30;
  24
  25 void SetMallocContextSize(u32 size);
  26 u32 GetMallocContextSize();
  27
  28 // Get the stack trace with the given pc and bp.
  29 // The pc will be in the position 0 of the resulting stack trace.
  30 // The bp may refer to the current frame or to the caller's frame.
  31 ALWAYS_INLINE
  32 void GetStackTraceWithPcBpAndContext(BufferedStackTrace *stack, uptr max_depth,
  33                                      uptr pc, uptr bp, void *context,
  34                                      bool fast) {
  35 #if SANITIZER_WINDOWS
  36   stack->Unwind(max_depth, pc, bp, context, 0, 0, fast);
  37 #else
  38   AsanThread *t;
  39   stack->size = 0;
  40   if (LIKELY(asan_inited)) {
  41     if ((t = GetCurrentThread()) && !t->isUnwinding()) {
  42       // On FreeBSD the slow unwinding that leverages _Unwind_Backtrace()
  43       // yields the call stack of the signal's handler and not of the code
  44       // that raised the signal (as it does on Linux).
  45       if (SANITIZER_FREEBSD && t->isInDeadlySignal()) fast = true;
  46       uptr stack_top = t->stack_top();
  47       uptr stack_bottom = t->stack_bottom();
  48       ScopedUnwinding unwind_scope(t);
  49       stack->Unwind(max_depth, pc, bp, context, stack_top, stack_bottom, fast);
  50     } else if (!t && !fast) {
  51       /* If GetCurrentThread() has failed, try to do slow unwind anyways. */
  52       stack->Unwind(max_depth, pc, bp, context, 0, 0, false);
  53     }
  54   }
  55 #endif // SANITIZER_WINDOWS
  56 }
  57
  58 } // namespace __asan
  59
  60 // NOTE: A Rule of thumb is to retrieve stack trace in the interceptors
  61 // as early as possible (in functions exposed to the user), as we generally
  62 // don't want stack trace to contain functions from ASan internals.
  63
  64 #define GET_STACK_TRACE(max_size, fast)                                        \
  65   BufferedStackTrace stack;                                                    \
  66   if (max_size <= 2) {                                                         \
  67     stack.size = max_size;                                                     \
  68     if (max_size > 0) {                                                        \
  69       stack.top_frame_bp = GET_CURRENT_FRAME();                                \
  70       stack.trace_buffer[0] = StackTrace::GetCurrentPc();                      \
  71       if (max_size > 1)                                                        \
  72         stack.trace_buffer[1] = GET_CALLER_PC();                               \
  73     }                                                                          \
  74   } else {                                                                     \
  75     GetStackTraceWithPcBpAndContext(&stack, max_size,                          \
  76                                     StackTrace::GetCurrentPc(),                \
  77                                     GET_CURRENT_FRAME(), 0, fast);             \
  78   }
  79
  80 #define GET_STACK_TRACE_FATAL(pc, bp)                                          \
  81   BufferedStackTrace stack;                                                    \
  82   GetStackTraceWithPcBpAndContext(&stack, kStackTraceMax, pc, bp, 0,           \
  83                                   common_flags()->fast_unwind_on_fatal)
  84
  85 #define GET_STACK_TRACE_SIGNAL(sig)                                            \
  86   BufferedStackTrace stack;                                                    \
  87   GetStackTraceWithPcBpAndContext(&stack, kStackTraceMax,                      \
  88                                   (sig).pc, (sig).bp, (sig).context,           \
  89                                   common_flags()->fast_unwind_on_fatal)
  90
  91 #define GET_STACK_TRACE_FATAL_HERE                                \
  92   GET_STACK_TRACE(kStackTraceMax, common_flags()->fast_unwind_on_fatal)
  93
  94 #define GET_STACK_TRACE_CHECK_HERE                                \
  95   GET_STACK_TRACE(kStackTraceMax, common_flags()->fast_unwind_on_check)
  96
  97 #define GET_STACK_TRACE_THREAD                                    \
  98   GET_STACK_TRACE(kStackTraceMax, true)
  99
 100 #define GET_STACK_TRACE_MALLOC                                                 \
 101   GET_STACK_TRACE(GetMallocContextSize(), common_flags()->fast_unwind_on_malloc)
 102
 103 #define GET_STACK_TRACE_FREE GET_STACK_TRACE_MALLOC
 104
 105 #define PRINT_CURRENT_STACK()   \
 106   {                             \
 107     GET_STACK_TRACE_FATAL_HERE; \
 108     stack.Print();              \
 109   }
 110
 111 #define PRINT_CURRENT_STACK_CHECK() \
 112   {                                 \
 113     GET_STACK_TRACE_CHECK_HERE;     \
 114     stack.Print();                  \
 115   }
 116
 117 #endif // ASAN_STACK_H