Ricardo Branco
63051fa2bf
The nstype argument of setns() 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 rule that blocks setns() with nstype == 0 compared the full 64-bit register with SCMP_CMP_EQ, so setting any bit above bit 31 let the call through, and the kernel then joined whichever namespace the fd referred to, even one that RestrictNamespaces= is supposed to deny. Use SCMP_CMP_MASKED_EQ with a 32-bit mask so we match on the same value the kernel does. Add a test that issues setns() via syscall() with an upper bit set. Follow-up for #44134 Signed-off-by: Ricardo Branco <rbranco@suse.de> (cherry picked from commit da72537164910f9050793055fef030711c00b954)
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