On Wed, May 18, 2022 at 01:43:16PM -0700, Suren Baghdasaryan wrote:
Introduce process_mrelease syscall sanity tests which include tests which expect to fail:
- process_mrelease with invalid pidfd and flags inputs
- process_mrelease on a live process with no pending signals
and valid process_mrelease usage which is expected to succeed. Because process_mrelease has to be used against a process with a pending SIGKILL, it's possible that the process exits before process_mrelease gets called. In such cases we retry the test with a victim that allocates twice more memory up to 1GB. This would require the victim process to spend more time during exit and process_mrelease has a better chance of catching the process before it exits and succeeding.
On success the test reports the amount of memory the child had to allocate for reaping to succeed. Sample output:
$ mrelease_test Success reaping a child with 1MB of memory allocations
On failure the test reports the failure. Sample outputs:
$ mrelease_test All process_mrelease attempts failed!
$ mrelease_test process_mrelease: Invalid argument
Signed-off-by: Suren Baghdasaryan surenb@google.com
Thanks your adding selftests, Suren! Acked-by: Christian Brauner (Microsoft) brauner@kernel.org