#Centipede Protect the shared mmap-ed buffers from forked processes.

This is a short-term solution that only works for Linux. PiperOrigin-RevId: 731036490
google · Feb 25, 2025 · 8d4231a · 8d4231a
1 parent 313a522
commit 8d4231a
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/centipede/shared_memory_blob_sequence.cc b/centipede/shared_memory_blob_sequence.cc
@@ -147,6 +147,11 @@ void SharedMemoryBlobSequence::MmapData() {
   data_ = static_cast<uint8_t *>(
       mmap(nullptr, size_, PROT_READ | PROT_WRITE, MAP_SHARED, fd_, 0));
   ErrorOnFailure(data_ == MAP_FAILED, "mmap() failed");
+#ifndef __APPLE__
+  // TODO: b/385774476 - this is a temporary and Linux-only solution to protect
+  // the mmap-ed region from forked processes.
+  ErrorOnFailure(madvise(data_, size_, MADV_DONTFORK), "madvise() failed");
+#endif
 }
 
 SharedMemoryBlobSequence::~SharedMemoryBlobSequence() {