Remove pid-caching from BufferPoolAccessor
BufferPoolAccessor cached the pid via a static constructor. If the
process forks after this, then multiple processes generating unique ids
using the same pid value. This resulted in connection ID collisions.
use getpid(), which already caches and resets appropriately across fork().
Bug: 142423602
Bug: 133186424
Test: boot, watch log connectionIds, collision-induced failures are gone
diff --git a/media/bufferpool/1.0/AccessorImpl.cpp b/media/bufferpool/1.0/AccessorImpl.cpp
index 09006ca..0d7e92f 100644
--- a/media/bufferpool/1.0/AccessorImpl.cpp
+++ b/media/bufferpool/1.0/AccessorImpl.cpp
@@ -14,10 +14,11 @@
* limitations under the License.
*/
-#define LOG_TAG "BufferPoolAccessor"
+#define LOG_TAG "BufferPoolAccessor1.0"
//#define LOG_NDEBUG 0
#include <sys/types.h>
+#include <stdint.h>
#include <time.h>
#include <unistd.h>
#include <utils/Log.h>
@@ -127,7 +128,6 @@
return false;
}
-int32_t Accessor::Impl::sPid = getpid();
uint32_t Accessor::Impl::sSeqId = time(nullptr);
Accessor::Impl::Impl(
@@ -145,14 +145,19 @@
{
std::lock_guard<std::mutex> lock(mBufferPool.mMutex);
if (newConnection) {
- ConnectionId id = (int64_t)sPid << 32 | sSeqId;
+ int32_t pid = getpid();
+ ConnectionId id = (int64_t)pid << 32 | sSeqId;
status = mBufferPool.mObserver.open(id, fmqDescPtr);
if (status == ResultStatus::OK) {
newConnection->initialize(accessor, id);
*connection = newConnection;
*pConnectionId = id;
mBufferPool.mConnectionIds.insert(id);
- ++sSeqId;
+ if (sSeqId == UINT32_MAX) {
+ sSeqId = 0;
+ } else {
+ ++sSeqId;
+ }
}
}
mBufferPool.processStatusMessages();