Samuel Dainard
3f2189ca25
When /proc is bind-mounted read-only (common in mock/Koji buildroots, containers, and other sandboxed environments), opening /proc/sys/fs/binfmt_misc returns ELOOP if it is an automount point that cannot be triggered in the read-only context. Currently binfmt_mounted_and_writable() only handles ENOENT, so ELOOP propagates as an error. This causes test-binfmt-util to fail with SIGABRT and disable_binfmt() to log a spurious warning at shutdown. Treat ELOOP and EACCES the same as ENOENT: binfmt_misc is not usably available, return false. Note: PR #37006 (merged April 2025) addressed ELOOP in the xstatfsat() path, but the open() call in binfmt_mounted_and_writable() remained unhandled. Fixes #38070
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