[compiler-rt] ce4618a - [ASan][windows] Recognize movzx r11d, BYTE PTR [rdx] in interception_win (#111638)

[via llvm-commits]

Author: Mike Hommey
Date: 2024-10-18T12:42:03Z
New Revision: ce4618a9c405bd8a9c1e096eb45e9ca83d3891f1

URL: https://github.com/llvm/llvm-project/commit/ce4618a9c405bd8a9c1e096eb45e9ca83d3891f1
DIFF: https://github.com/llvm/llvm-project/commit/ce4618a9c405bd8a9c1e096eb45e9ca83d3891f1.diff

LOG: [ASan][windows] Recognize movzx r11d, BYTE PTR [rdx] in interception_win (#111638)

The instruction is present in some library in the 24H2 update for
Windows 11:

==8508==interception_win: unhandled instruction at 0x7ff83e193a40: 44 0f
b6 1a 4c 8b d2 48

This could be generalized, but getting all the ModR/M byte combinations
right is tricky. Many other classes of instructions handled in this file
could use some generalization too.

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 4a6ff6656edb1c..4f60d4251303d6 100644
--- a/compiler-rt/lib/interception/interception_win.cpp
+++ b/compiler-rt/lib/interception/interception_win.cpp
@@ -768,6 +768,7 @@ static size_t GetInstructionSize(uptr address, size_t* rel_offset = nullptr) {
   }
 
   switch (*(u32*)(address)) {
+    case 0x1ab60f44:  // 44 0f b6 1a : movzx r11d, BYTE PTR [rdx]
     case 0x24448b48:  // 48 8b 44 24 XX : mov rax, QWORD ptr [rsp + XX]
     case 0x246c8948:  // 48 89 6C 24 XX : mov QWORD ptr [rsp + XX], rbp
     case 0x245c8948:  // 48 89 5c 24 XX : mov QWORD PTR [rsp + XX], rbx