I'm running clang 4.0.0 asan built on Linux x86_64. I built my code using clang++ -fsanitize=address.
I can't suppress the following memory issue reported by asan outside my code: (I have abridged the stack trace and modified some filepaths)
==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
I am following the instructions here, and I verified that my .supp is being read by typing gibberish in it and seeing "AddressSanitizer: failed to parse suppressions" printed to my terminal. I took a look at the src for __asan_memcpy in compiler-rt-4.0.0.src/lib/asan/asan_interceptors.cc
452 void *__asan_memcpy(void *to, const void *from, uptr size) {
453 ASAN_MEMCPY_IMPL(nullptr, to, from, size);
454 }
I think the "nullptr" is my problem. I followed the macro trail to find these lines
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 }
Since ctx is always "nullptr", "if (_ctx)" always evaluates to false, meaning I will not be able to suppress my memory error. Is this by design, or by mistake?
A quick look at the latest compiler-rt src that I pulled down today (git hash 286b899df64bb82a2da253114653adaf15da2fce, git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@323510 91177308-0d34-0410-b5e6-96231b3b80d8) shows the same situation exists for the latest asan implementation, so I don't think that updating to the latest asan rtl will help.
