musl - Need to zero pads in msghdr

Message-ID: <CANaxB-wowvkVuSxEiGOMf16fnK+HkDqwEs465HC9m3YRdRhfCQ@mail.gmail.com>
Date: Wed, 25 Jan 2017 08:42:52 -0800
From: Andrei Vagin <avagin@...il.com>
To: musl@...ts.openwall.com
Subject: Need to zero pads in msghdr

Hi,

In this patch
http://git.musl-libc.org/cgit/musl/commit/arch/x86_64/bits/socket.h?id=7168790763cdeb794df52be6e3b39fbb021c5a64
you suppose that the kernel ignores the upper 32 bits of msg_iovlen,
but it doesn't, so pads in msghdr structures have to be zeroed before
calling sendmsg and recvmsg syscalls.

https://github.com/xemul/criu/issues/276

Thanks,
Andrei

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