[compiler-rt] r366253 - [GWP-ASan] Add thread ID to PRNG seed.
Mitch Phillips via llvm-commits
llvm-commits at lists.llvm.org
Tue Jul 16 13:06:17 PDT 2019
Author: hctim
Date: Tue Jul 16 13:06:17 2019
New Revision: 366253
URL: http://llvm.org/viewvc/llvm-project?rev=366253&view=rev
Log:
[GWP-ASan] Add thread ID to PRNG seed.
Summary:
Adds thread ID to PRNG seed for increased entropy. In particular, this allows
multiple runs in quick succession that will have different PRNG seeds, allowing
for better demos/testing.
Reviewers: kcc
Reviewed By: kcc
Subscribers: kubamracek, #sanitizers, llvm-commits
Tags: #sanitizers, #llvm
Differential Revision: https://reviews.llvm.org/D64453
Modified:
compiler-rt/trunk/lib/gwp_asan/guarded_pool_allocator.h
compiler-rt/trunk/lib/gwp_asan/random.cpp
Modified: compiler-rt/trunk/lib/gwp_asan/guarded_pool_allocator.h
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/gwp_asan/guarded_pool_allocator.h?rev=366253&r1=366252&r2=366253&view=diff
==============================================================================
--- compiler-rt/trunk/lib/gwp_asan/guarded_pool_allocator.h (original)
+++ compiler-rt/trunk/lib/gwp_asan/guarded_pool_allocator.h Tue Jul 16 13:06:17 2019
@@ -132,6 +132,10 @@ public:
// occur.
static void reportError(uintptr_t AccessPtr, Error E = Error::UNKNOWN);
+ // Get the current thread ID, or kInvalidThreadID if failure. Note: This
+ // implementation is platform-specific.
+ static uint64_t getThreadID();
+
private:
static constexpr size_t kInvalidSlotID = SIZE_MAX;
@@ -146,10 +150,6 @@ private:
void markReadWrite(void *Ptr, size_t Size) const;
void markInaccessible(void *Ptr, size_t Size) const;
- // Get the current thread ID, or kInvalidThreadID if failure. Note: This
- // implementation is platform-specific.
- static uint64_t getThreadID();
-
// Get the page size from the platform-specific implementation. Only needs to
// be called once, and the result should be cached in PageSize in this class.
static size_t getPlatformPageSize();
Modified: compiler-rt/trunk/lib/gwp_asan/random.cpp
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/gwp_asan/random.cpp?rev=366253&r1=366252&r2=366253&view=diff
==============================================================================
--- compiler-rt/trunk/lib/gwp_asan/random.cpp (original)
+++ compiler-rt/trunk/lib/gwp_asan/random.cpp Tue Jul 16 13:06:17 2019
@@ -7,12 +7,14 @@
//===----------------------------------------------------------------------===//
#include "gwp_asan/random.h"
+#include "gwp_asan/guarded_pool_allocator.h"
#include <time.h>
namespace gwp_asan {
uint32_t getRandomUnsigned32() {
- thread_local uint32_t RandomState = static_cast<uint64_t>(time(nullptr));
+ thread_local uint32_t RandomState =
+ time(nullptr) + GuardedPoolAllocator::getThreadID();
RandomState ^= RandomState << 13;
RandomState ^= RandomState >> 17;
RandomState ^= RandomState << 5;
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