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fix: Apply restrictive permissions to shared memory #460

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Merged
whoisj merged 1 commit into from
Oct 7, 2026
Merged

fix: Apply restrictive permissions to shared memory #460

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6 changes: 5 additions & 1 deletion src/shm_manager.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -134,8 +134,12 @@ SharedMemoryManager::SharedMemoryManager(
if (create) {
// Remove (if any) and create the region.
bi::shared_memory_object::remove(shm_region_name.c_str());
// Create permissions for the shm region: read/write user + read-only
// group.
bi::permissions perms{S_IRUSR | S_IWUSR | S_IRGRP};
// Create the shm region object with the specified permissions.
shm_obj_ = std::make_unique<bi::shared_memory_object>(
bi::create_only, shm_region_name.c_str(), bi::read_write);
bi::create_only, shm_region_name.c_str(), bi::read_write, perms);
shm_obj_->truncate(shm_size);
} else {
// Open the existing region.
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