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[winasan] Unpoison the stack in NtTerminateThread 

In long-running builds we've seen some ASan complaints during thread creation that we suspect are due to leftover poisoning from previous threads whose stacks occupied that memory. This patch adds a hook that unpoisons the stack just before the NtTerminateThread syscall.

Differential Revision: https://reviews.llvm.org/D52091

llvm-svn: 342652
This commit is contained in:
David Major 2018-09-20 14:59:33 +00:00
parent caa9619bce
commit 468f53b58c
1 changed files with 11 additions and 1 deletions
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12
compiler-rt/lib/asan/asan_win.cc
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@ -154,6 +154,14 @@ INTERCEPTOR_WINAPI(DWORD, CreateThread,
asan_thread_start, t, thr_flags, tid);
}
INTERCEPTOR_WINAPI(void, NtTerminateThread, void *rcx) {
// Unpoison the terminating thread's stack because the memory may be re-used.
NT_TIB *tib = (NT_TIB *)NtCurrentTeb();
uptr stackSize = (uptr)tib->StackBase - (uptr)tib->StackLimit;
__asan_unpoison_memory_region(tib->StackLimit, stackSize);
return REAL(NtTerminateThread(rcx));
}
// }}}
namespace __asan {
@ -161,7 +169,9 @@ namespace __asan {
void InitializePlatformInterceptors() {
ASAN_INTERCEPT_FUNC(CreateThread);
ASAN_INTERCEPT_FUNC(SetUnhandledExceptionFilter);
CHECK(::__interception::OverrideFunction("NtTerminateThread",
(uptr)WRAP(NtTerminateThread),
(uptr *)&REAL(NtTerminateThread)));
#ifdef _WIN64
ASAN_INTERCEPT_FUNC(__C_specific_handler);
#else