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Add tests for all ptrace actions checking "blockers=ptrace" records. This also improves PTRACE_TRACEME and PTRACE_ATTACH tests by making sure that the restrictions comes from Landlock, and with the expected process. These extended tests are like enhanced errno checks that make sure Landlock enforcement is consistent. Cc: Günther Noack <gnoack@google.com> Cc: Paul Moore <paul@paul-moore.com> Link: https://lore.kernel.org/r/20250320190717.2287696-25-mic@digikod.net Signed-off-by: Mickaël Salaün <mic@digikod.net>