[compiler-rt] cbe27c4 - [ASan][Windows] Interception fix for 'mov al, byte ptr []' sequences (#72531)

[via llvm-commits]

Author: Zack Johnson
Date: 2023-12-07T10:17:58-05:00
New Revision: cbe27c45cdb33e73ee7b29c46e2a64359ae5cc8e

URL: https://github.com/llvm/llvm-project/commit/cbe27c45cdb33e73ee7b29c46e2a64359ae5cc8e
DIFF: https://github.com/llvm/llvm-project/commit/cbe27c45cdb33e73ee7b29c46e2a64359ae5cc8e.diff

LOG: [ASan][Windows] Interception fix for 'mov al, byte ptr []' sequences (#72531)

Added: 
    

Modified: 
    compiler-rt/lib/interception/interception_win.cpp

Removed: 
    


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diff  --git a/compiler-rt/lib/interception/interception_win.cpp b/compiler-rt/lib/interception/interception_win.cpp
index f3e62419beff1..f1a549b938e20 100644
--- a/compiler-rt/lib/interception/interception_win.cpp
+++ b/compiler-rt/lib/interception/interception_win.cpp
@@ -578,6 +578,7 @@ static size_t GetInstructionSize(uptr address, size_t* rel_offset = nullptr) {
     case 0x018a:  // mov al, byte ptr [rcx]
       return 2;
 
+    case 0x058A:  // 8A 05 XX XX XX XX : mov al, byte ptr [XX XX XX XX]
     case 0x058B:  // 8B 05 XX XX XX XX : mov eax, dword ptr [XX XX XX XX]
       if (rel_offset)
         *rel_offset = 2;