Dan Nicholson
9217255427
Currently test_setpriority_closest assumes that setting RLIMIT_NICE to 30 will fail if the process is unprivileged. If it succeeds, it assumes that the process is privileged and setresuid and setresgid will succeed. However, if RLIMIT_NICE is already >= 30, then setrlimit will succeed even if the process is unprivileged. Guard against that by checking for permission errors in setresuid and setresgid and skipping the full test if so. Fixes #22896.
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