[msan] Mprotect all inaccessible memory regions.

Fix 2 bugs in memory mapping setup:
- the invalid region at offset 0 was not protected because mmap at
  address 0 fails with EPERM on most Linux systems. We did not
  notice this because the check condition was flipped: the code was
  checking that mprotect has failed. And the test that was supposed
  to catch this was weakened by the mitigations in the mmap
  interceptor.
- when running without origins, the origin shadow range was left
  unprotected.

The new test ensures that mmap w/o MAP_FIXED always returns valid
application addresses.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@238109 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/msan/msan.h b/lib/msan/msan.h
index 2d48e69d7..0adbeb68f 100644
--- a/lib/msan/msan.h
+++ b/lib/msan/msan.h
@@ -125,7 +125,7 @@ extern bool msan_init_is_running;
 extern int msan_report_count;
 
 bool ProtectRange(uptr beg, uptr end);
-bool InitShadow(bool map_shadow, bool init_origins);
+bool InitShadow(bool init_origins);
 char *GetProcSelfMaps();
 void InitializeInterceptors();