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Date: Wed, 25 Jan 2017 12:00:48 -0500
From: Rich Felker <>
Subject: Re: Need to zero pads in msghdr

On Wed, Jan 25, 2017 at 08:42:52AM -0800, Andrei Vagin wrote:
> Hi,
> In this patch
> 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.

sendmsg and recvmsg perform this zeroing. If it's not working there
must be some more subtle cause.


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