Re: [PATCH v2 14/27] selftests/landlock: Make audit_message large enough for any exe filter

audit_filter_exe() copies the filtered executable path after the
audit_rule_data header in struct audit_message.  The message buffer was
sized as PATH_MAX + 200 bytes with received records in mind, but
struct audit_rule_data alone takes 1040 bytes.  That leaves only 3256
bytes for the path, while the kernel accepts up to PATH_MAX bytes, so a
long path overflows the message.

Size the buffer for an audit_rule_data followed by a PATH_MAX string.
This only makes the buffer larger, so received records still fit.

Also check that the request fits in the message and return -E2BIG
otherwise, in case exe_len does not match the filter's buffer.

Signed-off-by: Günther Noack <redacted>

Sashiko has reviewed this patch and found no issues.

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Sashiko AI review · https://sashiko.dev/#/patchset/20261104-selftests-refactor-v2-0-c52f23f7ce33@gmail.com?part=14