[asan] Intercept RtlRaiseException instead of kernel32!RaiseException

Summary:
On my install of Windows 10, RaiseException is a tail call to
kernelbase!RaiseException. Obviously, we fail to intercept that.
Instead, try hooking at the ntdll!RtlRaiseException layer. It is
unlikely that this layer will contain control flow.

Intercepting at this level requires adding a decoding for
'LEA ESP, [ESP + 0xXXXXXXXX]', which is a really obscure way to write
'SUB ESP, 0xXXXXXXXX' that avoids clobbering EFLAGS.

Reviewers: etienneb

Subscribers: llvm-commits, kubabrecka

Differential Revision: https://reviews.llvm.org/D23046

llvm-svn: 277518

1 files changed, 3 insertions, 0 deletions

diff --git a/compiler-rt/lib/interception/interception_win.cc b/compiler-rt/lib/interception/interception_win.cc
index 3b1b858db63..5acb4afe765 100644
--- a/compiler-rt/lib/interception/interception_win.cc
+++ b/compiler-rt/lib/interception/interception_win.cc
@@ -565,6 +565,9 @@ static size_t GetInstructionSize(uptr address, size_t* rel_offset = nullptr) {
     case 0x24748B:  // 8B 74 24 XX : mov esi, dword ptr [esp + XX]
     case 0x247C8B:  // 8B 7C 24 XX : mov edi, dword ptr [esp + XX]
       return 4;
+
+    case 0x24A48D:  // 8D A4 24 XX XX XX XX : lea esp, [esp + XX XX XX XX]
+      return 7;
   }
 
   switch (*(u32*)address) {