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freebsd32: fix padding of computed control message length for recvmsg()

Authored by jah on Mar 30 2019, 11:21 PM.



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

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rS FreeBSD src repository
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