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Each control message region must be aligned on a 4-byte boundary on 32-bit architectures. The 32-bit compat shim for recvmsg() gets the actual layout right, but doesn't pad the payload length when computing msg_controllen for the output message header. If a control message contains an unaligned payload, such as the 1-byte TTL field in the example attached to PR 236737, this can produce control message payload boundaries that extend beyond the boundary reported by msg_controllen. PR: 236737 Reported by: Yuval Pavel Zholkover <paulzhol@gmail.com> Reviewed by: markj MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D19768 |
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