[compiler-rt] 98c9523 - [scudo] Fix isOwned on MTE devices. (#110717)

[via llvm-commits]

Author: Evgenii Stepanov
Date: 2024-10-01T12:48:56-07:00
New Revision: 98c9523113b550eaca3728bf30cbc346af5eff07

URL: https://github.com/llvm/llvm-project/commit/98c9523113b550eaca3728bf30cbc346af5eff07
DIFF: https://github.com/llvm/llvm-project/commit/98c9523113b550eaca3728bf30cbc346af5eff07.diff

LOG: [scudo] Fix isOwned on MTE devices. (#110717)

If called on an address that is actually not owned, the header tag might not
match. This would cause an MTE fault in Chunk::isValid.

Disable tag checks in isOwned().

Added: 
    

Modified: 
    compiler-rt/lib/scudo/standalone/combined.h

Removed: 
    


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diff  --git a/compiler-rt/lib/scudo/standalone/combined.h b/compiler-rt/lib/scudo/standalone/combined.h
index a5f1bc388e8824..88fdc5943d6f81 100644
--- a/compiler-rt/lib/scudo/standalone/combined.h
+++ b/compiler-rt/lib/scudo/standalone/combined.h
@@ -785,6 +785,8 @@ class Allocator {
   // A corrupted chunk will not be reported as owned, which is WAI.
   bool isOwned(const void *Ptr) {
     initThreadMaybe();
+    // If the allocation is not owned, the tags could be wrong.
+    ScopedDisableMemoryTagChecks x;
 #ifdef GWP_ASAN_HOOKS
     if (GuardedAlloc.pointerIsMine(Ptr))
       return true;