https://llvm.org/bugs/show_bug.cgi?id=31877
Bug ID: 31877
Summary: Program crashes when throwing exception under memory
sanitizer.
Product: libc++abi
Version: 4.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedb...@nondot.org
Reporter: halya...@chromium.org
CC: k...@google.com, llvm-bugs@lists.llvm.org,
mclow.li...@gmail.com
Classification: Unclassified
The following program crashes with memory sanitizer.
test.cpp:
#include <stdio.h>
#include <exception>
// Poison parameters shadow.
__attribute__ ((noinline)) void func(int, int, int, int, int, int) {
try {
throw std::exception();
} catch (std::exception& e) {
printf("here\n");
}
}
int main() {
int a, b, c, d, e, f;
func(a, b, c, d, e, f);
}
Compilation:
1. Compile and copy memory-sanitized libc++.so and libc++abi.so to the same
folder as test.cpp.
2. clang++ test.cpp -o test -stdlib=libc++ -L. -Wl,-rpath=. -fsanitize=memory
Output:
./test
==3802==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x7f51243b3313 in get_thrown_object_ptr
/home/halyavin/other/llvm/projects/libcxxabi/src/cxa_personality.cpp:490:27
#1 0x7f51243b3313 in __cxxabiv1::scan_eh_tab(__cxxabiv1::(anonymous
namespace)::scan_results&, _Unwind_Action, bool, _Unwind_Exception*,
_Unwind_Context*)
/home/halyavin/other/llvm/projects/libcxxabi/src/cxa_personality.cpp:736
#2 0x7f51243b14e5 in __gxx_personality_v0
/home/halyavin/other/llvm/projects/libcxxabi/src/cxa_personality.cpp:951:9
#3 0x7f5124995262 (/lib/x86_64-linux-gnu/libgcc_s.so.1+0x10262)
#4 0x7f51243aff6d in __cxa_throw
/home/halyavin/other/llvm/projects/libcxxabi/src/cxa_exception.cpp:238:5
#5 0x489534 in func(int, int, int, int, int, int)
(/home/halyavin/other/msan-exceptions/test+0x489534)
#6 0x4897f4 in main (/home/halyavin/other/msan-exceptions/test+0x4897f4)
#7 0x7f51245dc82f (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
#8 0x419c88 in _start (/home/halyavin/other/msan-exceptions/test+0x419c88)
The problem is that libgcc_s.so is not memory sanitized and so it does not
update parameters shadow before calling __gxx_personality_v0 function.
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