Ricardo Branco 399c086887 nspawn: mask socket() arguments to 32 bits in the NETLINK_AUDIT filter
The domain and protocol arguments of socket() are ints, but are passed
to the kernel in 64-bit registers, and the kernel truncates them to the
low 32 bits. The rule that makes socket(AF_NETLINK, *, NETLINK_AUDIT)
fail compared the full 64-bit registers with SCMP_CMP_EQ, so setting any
bit above bit 31 in either argument let an audit socket be created.

Use SCMP_CMP_MASKED_EQ with a 32-bit mask for both comparisons.

Follow-up for #44134

Signed-off-by: Ricardo Branco <rbranco@suse.de>
(cherry picked from commit 03e27922cae696af7a15b5375e1820e868284286)
2026-10-16 17:24:51 +01:00
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