[compiler-rt] Prevent symbolizer from starting itself.
Summary:
If symbolizer was instrumented with sanitizer and crash, it may
try to call itself again causing infinite recursion of crashing processes.
Reviewers: eugenis
Subscribers: kubamracek, llvm-commits, dberris
@@ -385,7 +385,23 @@ SymbolizerProcess::SymbolizerProcess(const char *path, bool use_forkpty)
CHECK_NE(path_[0], '\0');
}
+static bool IsSameModule(const char* path) {
+ if (const char* ProcessName = GetProcessName()) {
+ if (const char* SymbolizerName = StripModuleName(path)) {
+ return !internal_strcmp(ProcessName, SymbolizerName);
+ }
+ }
+ return false;
+}
+
const char *SymbolizerProcess::SendCommand(const char *command) {
+ if (failed_to_start_)
+ return nullptr;
+ if (IsSameModule(path_)) {
+ Report("WARNING: Symbolizer was blocked from starting itself!\n");
+ failed_to_start_ = true;
+ return nullptr;
+ }
for (; times_restarted_ < kMaxTimesRestarted; times_restarted_++) {
// Start or restart symbolizer if we failed to send command to it.
if (const char *res = SendCommandImpl(command))
