[PATCH] D46457: [asan] Add a magic shadow value for shadw gap

[Walter Lee via Phabricator via llvm-commits]

waltl created this revision.
waltl added reviewers: vitalybuka, eugenis, alekseyshl.
Herald added a subscriber: kubamracek.

This gives us something to insert into the shadow gap for systems that
don't have memory protection turned on there (i.e. on Myriad).


Repository:
  rL LLVM

https://reviews.llvm.org/D46457

Files:
  compiler-rt/lib/asan/asan_errors.cc
  compiler-rt/lib/asan/asan_internal.h


Index: compiler-rt/lib/asan/asan_internal.h
===================================================================
--- compiler-rt/lib/asan/asan_internal.h
+++ compiler-rt/lib/asan/asan_internal.h
@@ -147,6 +147,7 @@
 const int kAsanIntraObjectRedzone = 0xbb;
 const int kAsanAllocaLeftMagic = 0xca;
 const int kAsanAllocaRightMagic = 0xcb;
+const int kAsanShadowMemory = 0xcc;
 
 static const uptr kCurrentStackFrameMagic = 0x41B58AB3;
 static const uptr kRetiredStackFrameMagic = 0x45E0360E;
Index: compiler-rt/lib/asan/asan_errors.cc
===================================================================
--- compiler-rt/lib/asan/asan_errors.cc
+++ compiler-rt/lib/asan/asan_errors.cc
@@ -514,6 +514,7 @@
   PrintShadowByte(str, "  ASan internal:           ", kAsanInternalHeapMagic);
   PrintShadowByte(str, "  Left alloca redzone:     ", kAsanAllocaLeftMagic);
   PrintShadowByte(str, "  Right alloca redzone:    ", kAsanAllocaRightMagic);
+  PrintShadowByte(str, "  Shadow memory:           ", kAsanShadowMemory);
 }
 
 static void PrintShadowBytes(InternalScopedString *str, const char *before,


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