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