我正在运行基于Linux x86_64的clang 4.0.0 asan。我使用clang ++ -fsanitize = address。
构建了我的代码我无法抑制asan在我的代码之外报告的以下内存问题:(我已经删除了堆栈跟踪并修改了一些文件路径）
==104630==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60200019367c at pc 0x2aaaaadc0d85 bp 0x7fffffff7e90 sp 0x7fffffff7640
READ of size 16 at 0x60200019367c thread T0
#0 0x2aaaaadc0d84 in __asan_memcpy /path/to/llvm-4.0.0.src/projects/compiler-rt/lib/asan/asan_interceptors.cc:453
#1 0x5b74a8 in _ZNSt3__116allocator_traitsINS_9allocatorIiEEE20__construct_backwardIiEENS_9enable_ifIXaaoosr7is_sameIS2_NS1_IT_EEEE5valuentsr15__has_constructIS2_PS6_S6_EE5valuesr31is_trivially_move_constructibleIS6_EE5valueEvE4typeERS2_S8_S8_RS8_ /path/to/clang/clang-4.0.0/rawbin/../include/c++/v1/memory:1676:17
#2 0x5b74a8 in std::__1::vector<int, std::__1::allocator<int> >::__swap_out_circular_buffer(std::__1::__split_buffer<int, std::__1::allocator<int>&>&) /path/to/clang/clang-4.0.0/rawbin/../include/c++/v1/vector:886
#3 0x5b648a in void std::__1::vector<int, std::__1::allocator<int> >::__push_back_slow_path<int const&>(int const&) /path/to/clang/clang-4.0.0/rawbin/../include/c++/v1/vector:1574:5
#4 0x1d8d2ba in std::__1::vector<int, std::__1::allocator<int> >::push_back(int const&) /path/to/clang/clang-4.0.0/rawbin/../include/c++/v1/vector:1591:9
#5 0x1d8d2ba in bar::baz(a_type const*, int const*, std::__1::vector<int, std::__1::allocator<int> >&) /path/to/installed/3rd/party/library/that/i/did/not/build/foo.cc:394
我按照here的说明进行操作，并且通过在其中键入乱码并看到打印到我的终端的“AddressSanitizer：无法解析抑制”来验证我的.supp正在读取。我在compiler-rt-4.0.0.src / lib / asan / asan_interceptors.cc中查看了src的__asan_memcpy
452 void *__asan_memcpy(void *to, const void *from, uptr size) {
453 ASAN_MEMCPY_IMPL(nullptr, to, from, size);
454 }
我认为“nullptr”是我的问题。我按照宏观线索找到了这些线
68 AsanInterceptorContext *_ctx = (AsanInterceptorContext *)ctx; \
69 bool suppressed = false; \
70 if (_ctx) { \
71 suppressed = IsInterceptorSuppressed(_ctx->interceptor_name); \
72 if (!suppressed && HaveStackTraceBasedSuppressions()) { \
73 GET_STACK_TRACE_FATAL_HERE; \
74 suppressed = IsStackTraceSuppressed(&stack); \
75 } \
76 } \
77 if (!suppressed) { \
78 GET_CURRENT_PC_BP_SP; \
79 ReportGenericError(pc, bp, sp, __bad, isWrite, __size, 0, false);\
80 }
由于ctx总是“nullptr”，“if（_ctx）”总是计算为false，这意味着我将无法抑制内存错误。这是设计还是错误？
快速浏览我今天下载的最新编译器-rt src（git hash 286b899df64bb82a2da253114653adaf15da2fce，git-svn-id：https://llvm.org/svn/llvm-project/compiler-rt/trunk@323510 91177308-0d34-0410-b5e6-96231b3b80d8）显示了相同的情况最新的asan实现，所以我不认为更新到最新的asan rtl会有所帮助。