socket: fix AF_PACKET recvmsg() and sockaddr formatting#271
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- Do not unconditionally pass the `MSG_CMSG_CLOEXEC` flag to `recvmsg()` invocations as not all protocol specific recvmsg implementations in the kernel tolerate it; `packet_recvmsg()` for example will immediately return yield `EINVAL` if any non-whitelisted flag is passed. - Ensure that the HW address string buffer is zero-terminated when converting MAC addresses from C to ucode values. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Do not unconditionally pass the
MSG_CMSG_CLOEXECflag torecvmsg()invocations as not all protocol specific recvmsg implementations in the kernel tolerate it;packet_recvmsg()for example will immediately return yieldEINVALif any non-whitelisted flag is passed.Ensure that the HW address string buffer is zero-terminated when converting MAC addresses from C to ucode values.