[llvm-branch-commits] [HWASan] [compiler-rt] Add non_negative_pointers option to HWASan alloc (PR #191089)

[Florian Mayer via llvm-branch-commits]

================
@@ -91,3 +91,6 @@ HWASAN_FLAG(
     "instead of choosing one dynamically."
     "Tip: this can be combined with the compiler option, "
     "-hwasan-mapping-offset, to optimize the instrumentation.")
+
+HWASAN_FLAG(bool, non_negative_pointers, false,
----------------
fmayer wrote:

`HwasanDeallocate` only sets memory tag, so it can be 8 bits

```
// Always store full 8-bit tags on free to maximize UAF detection
```

https://github.com/llvm/llvm-project/pull/191089