Ricardo Branco
73bbe7d0d4
The domain argument of socket() is an int, but it is passed to the kernel in a 64-bit register, and the kernel truncates it to the low 32 bits. The deny-list rules we install compared the full 64-bit register with SCMP_CMP_EQ, so setting any bit above bit 31 (e.g. AF_VSOCK | 1UL << 32) let a denied family through unfiltered. Use SCMP_CMP_MASKED_EQ with a 32-bit mask so we match on the same value the kernel does. The allow-list path is not affected: it relies on the LT/GT range checks, which compare as unsigned 64-bit, so values with upper bits set are always rejected. Add a test that issues socket() via syscall() with an upper bit set. Fixes: #44134 Signed-off-by: Ricardo Branco <rbranco@suse.de> (cherry picked from commit62eb6cd8ea) (cherry picked from commitf190b1a631) (cherry picked from commitf739a5ac5a)
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