logd: sock_alloc_send_pskb starves pruning

Allow socket send syscall to terminate after 32 seconds if reader
stalled because of memory pressure allocating new network buffers

Add a gTest to catch regressions, add security buffer to log_dump

Bug: 27242723
Change-Id: Idaa6699d9d284e7f5f723ae0e76b3d6aa3371489

1 files changed, 6 insertions, 0 deletions

diff --git a/logd/LogReader.cpp b/logd/LogReader.cpp
index 16362379c..2c07984ce 100644
--- a/logd/LogReader.cpp
+++ b/logd/LogReader.cpp
@@ -18,6 +18,7 @@
 #include <poll.h>
 #include <sys/prctl.h>
 #include <sys/socket.h>
+#include <sys/types.h>
 
 #include <cutils/sockets.h>
 
@@ -179,6 +180,11 @@ bool LogReader::onDataAvailable(SocketClient *cli) {
     }
 
     FlushCommand command(*this, nonBlock, tail, logMask, pid, sequence, timeout);
+
+    // Set acceptable upper limit to wait for slow reader processing b/27242723
+    struct timeval t = { LOGD_SNDTIMEO, 0 };
+    setsockopt(cli->getSocket(), SOL_SOCKET, SO_SNDTIMEO, (const char *)&t, sizeof(t));
+
     command.runSocketCommand(cli);
     return true;
 }