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[ASan/Win] Handle SEH exceptions (best-effort, similar to longjmp) 

llvm-svn: 213654
This commit is contained in:
Timur Iskhodzhanov 2014-07-22 13:44:18 +00:00
parent 319f0ff3b7
commit 6d4a6cd68f
3 changed files with 64 additions and 2 deletions
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7
compiler-rt/lib/asan/asan_interceptors.cc
View File

@ -301,6 +301,12 @@ INTERCEPTOR_WINAPI(void, RaiseException, void *a, void *b, void *c, void *d) {
__asan_handle_no_return();
REAL(RaiseException)(a, b, c, d);
}
INTERCEPTOR(int, _except_handler3, void *a, void *b, void *c, void *d) {
CHECK(REAL(_except_handler3));
__asan_handle_no_return();
return REAL(_except_handler3)(a, b, c, d);
}
#endif
#if ASAN_INTERCEPT_MLOCKX
@ -737,6 +743,7 @@ namespace __asan {
void InitializeWindowsInterceptors() {
ASAN_INTERCEPT_FUNC(CreateThread);
ASAN_INTERCEPT_FUNC(RaiseException);
ASAN_INTERCEPT_FUNC(_except_handler3);
}
} // namespace __asan

8
compiler-rt/lib/asan/asan_report.cc
View File

@ -427,8 +427,12 @@ bool DescribeAddressIfStack(uptr addr, uptr access_size) {
prev_var_end, next_var_beg);
}
Printf("HINT: this may be a false positive if your program uses "
"some custom stack unwind mechanism or swapcontext\n"
" (longjmp and C++ exceptions *are* supported)\n");
"some custom stack unwind mechanism or swapcontext\n");
if (SANITIZER_WINDOWS)
Printf(" (longjmp, SEH and C++ exceptions *are* supported)\n");
else
Printf(" (longjmp and C++ exceptions *are* supported)\n");
DescribeThread(t);
return true;
}

51
compiler-rt/test/asan/TestCases/Windows/seh.cc Normal file
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@ -0,0 +1,51 @@
// Clang doesn't support SEH on Windows yet, so for the time being we
// build this program in two parts: the code with SEH is built with CL,
// the rest is built with Clang. This represents the typical scenario when we
// build a large project using "clang-cl -fallback -fsanitize=address".
//
// RUN: cl -Zi -FS -GS- -c %s -Fo%t.obj
// RUN: %clangxx_asan -o %t.exe %s %t.obj
// RUN: %run %t.exe
#include <windows.h>
#include <assert.h>
#include <stdio.h>
// Should just "#include <sanitizer/asan_interface.h>" when C++ exceptions are
// supported and we don't need to use CL.
extern "C" bool __asan_address_is_poisoned(void *p);
void ThrowAndCatch();
#if !defined(__clang__)
__declspec(noinline)
void Throw() {
int local, zero = 0;
fprintf(stderr, "Throw: %p\n", &local);
local = 5 / zero;
}
__declspec(noinline)
void ThrowAndCatch() {
int local;
__try {
Throw();
} __except(EXCEPTION_EXECUTE_HANDLER) {
fprintf(stderr, "__except: %p\n", &local);
}
}
#else
int main() {
char x[32];
fprintf(stderr, "Before: %p poisoned: %d\n", &x,
__asan_address_is_poisoned(x + 32));
assert(__asan_address_is_poisoned(x + 32));
ThrowAndCatch();
fprintf(stderr, "After: %p poisoned: %d\n", &x,
__asan_address_is_poisoned(x + 32));
// FIXME: Invert this assertion once we fix
// https://code.google.com/p/address-sanitizer/issues/detail?id=258
assert(!__asan_address_is_poisoned(x + 32));
}
#endif