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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