gh-151519: Check effective gid in _test_all_chown_common group-0 guard#151521
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itamaro wants to merge 1 commit into
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gh-151519: Check effective gid in _test_all_chown_common group-0 guard#151521itamaro wants to merge 1 commit into
_test_all_chown_common group-0 guard#151521itamaro wants to merge 1 commit into
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…p-0 guard The guard that skips the "chown to gid 0 should fail" assertion used only `os.getgroups()` (supplementary groups). The kernel also accepts the effective/filesystem gid for chown, so when a process runs with egid 0 and a non-zero uid (common in containers and user namespaces), chown(-1, 0) succeeds and the assertion spuriously fails. Add an `os.getegid() != 0` check alongside the existing `0 not in os.getgroups()` guard.
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The guard that skips the "chown to gid 0 should fail" assertion used only
os.getgroups()(supplementary groups). The kernel also accepts the effective/filesystem gid for chown, so when a process runs with egid 0 and a non-zero uid (common in containers and user namespaces), chown(-1, 0) succeeds and the assertion spuriously fails.Add an
os.getegid() != 0check alongside the existing0 not in os.getgroups()guard.