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authorPieter Wuille <pieter.wuille@gmail.com>2017-05-05 11:32:06 -0700
committerPieter Wuille <pieter.wuille@gmail.com>2017-05-05 11:56:24 -0700
commit33f853d8d88917b145e2793bf8eb1b4e3790e7e7 (patch)
tree65ca7a2c2d47eaa28d87ad1513a7ebc3a385d3a3 /src/random.cpp
parentf544094d5e1ee627ebd34542aead7bf1241fae19 (diff)
Test that GetPerformanceCounter() increments
Diffstat (limited to 'src/random.cpp')
-rw-r--r--src/random.cpp12
1 files changed, 11 insertions, 1 deletions
diff --git a/src/random.cpp b/src/random.cpp
index 40879e8737..8107cb3105 100644
--- a/src/random.cpp
+++ b/src/random.cpp
@@ -17,6 +17,7 @@
#include <stdlib.h>
#include <limits>
#include <chrono>
+#include <thread>
#ifndef WIN32
#include <sys/time.h>
@@ -262,6 +263,8 @@ FastRandomContext::FastRandomContext(const uint256& seed) : requires_seed(false)
bool Random_SanityCheck()
{
+ uint64_t start = GetPerformanceCounter();
+
/* This does not measure the quality of randomness, but it does test that
* OSRandom() overwrites all 32 bytes of the output given a maximum
* number of tries.
@@ -288,7 +291,14 @@ bool Random_SanityCheck()
tries += 1;
} while (num_overwritten < NUM_OS_RANDOM_BYTES && tries < MAX_TRIES);
- return (num_overwritten == NUM_OS_RANDOM_BYTES); /* If this failed, bailed out after too many tries */
+ if (num_overwritten != NUM_OS_RANDOM_BYTES) return false; /* If this failed, bailed out after too many tries */
+
+ // Check that GetPerformanceCounter increases at least during a GetOSRand() call + 1ms sleep.
+ std::this_thread::sleep_for(std::chrono::milliseconds(1));
+ uint64_t stop = GetPerformanceCounter();
+ if (stop == start) return false;
+
+ return true;
}
FastRandomContext::FastRandomContext(bool fDeterministic) : requires_seed(!fDeterministic), bytebuf_size(0), bitbuf_size(0)