Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Wed, 25 Jan 2017 10:56:22 -0800
From: Andrei Vagin <>
Subject: Re: Need to zero pads in msghdr

On Wed, Jan 25, 2017 at 8:42 AM, 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.

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

I understand that it is not a bug for many users of mucl-libc, but in
case of CRIU we see this issue.

> Thanks,
> Andrei

Powered by blists - more mailing lists

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.