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Message-ID: <CANaxB-x6+vAc_Jjc42h0J3cZD8hrRazCVRwr5fOgO+R2V9U8Jg@mail.gmail.com>
Date: Wed, 25 Jan 2017 10:56:22 -0800
From: Andrei Vagin <avagin@...il.com>
To: musl@...ts.openwall.com
Subject: Re: Need to zero pads in msghdr
On Wed, Jan 25, 2017 at 8:42 AM, Andrei Vagin <avagin@...il.com> wrote:
> 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.
Actually the problem is a bit different. In CRIU we use the msghdr
structure from musl-libc, but in some cases we have to call raw system
calls. We don't expect to have pads in structures and so we don't zero
them.
I understand that it is not a bug for many users of mucl-libc, but in
case of CRIU we see this issue.
> https://github.com/xemul/criu/issues/276
>
> Thanks,
> Andrei
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