[PATCH] D58195: [HWASAN] Updated HWASAN design document to better portray the chance of missing a bug.

[Mitch Phillips via Phabricator via cfe-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rC353990: [HWASAN] Updated HWASAN design document to better 
portray the chance of missing… (authored by hctim, committed by ).

Changed prior to commit:
  https://reviews.llvm.org/D58195?vs=186695&id=186754#toc

Repository:
  rC Clang

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D58195/new/

https://reviews.llvm.org/D58195

Files:
  docs/HardwareAssistedAddressSanitizerDesign.rst


Index: docs/HardwareAssistedAddressSanitizerDesign.rst
===================================================================
--- docs/HardwareAssistedAddressSanitizerDesign.rst
+++ docs/HardwareAssistedAddressSanitizerDesign.rst
@@ -131,7 +131,8 @@
     https://www.kernel.org/doc/Documentation/arm64/tagged-pointers.txt).
   * **Does not require redzones to detect buffer overflows**,
     but the buffer overflow detection is probabilistic, with roughly
-    `(2**TS-1)/(2**TS)` probability of catching a bug.
+    `1/(2**TS)` chance of missing a bug (6.25% or 0.39% with 4 and 8-bit TS
+    respectively).
   * **Does not require quarantine to detect heap-use-after-free,
     or stack-use-after-return**.
     The detection is similarly probabilistic.



Index: docs/HardwareAssistedAddressSanitizerDesign.rst
===================================================================
--- docs/HardwareAssistedAddressSanitizerDesign.rst
+++ docs/HardwareAssistedAddressSanitizerDesign.rst
@@ -131,7 +131,8 @@
     https://www.kernel.org/doc/Documentation/arm64/tagged-pointers.txt).
   * **Does not require redzones to detect buffer overflows**,
     but the buffer overflow detection is probabilistic, with roughly
-    `(2**TS-1)/(2**TS)` probability of catching a bug.
+    `1/(2**TS)` chance of missing a bug (6.25% or 0.39% with 4 and 8-bit TS
+    respectively).
   * **Does not require quarantine to detect heap-use-after-free,
     or stack-use-after-return**.
     The detection is similarly probabilistic.

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