From: David Miller <davem@davemloft.net>
To: sar@nec-labs.com
Cc: luto@amacapital.net, netdev@vger.kernel.org,
mtk.manpages@gmail.com, ebiederm@xmission.com
Subject: Re: bug in passing file descriptors
Date: Mon, 07 Oct 2013 17:32:37 -0400 (EDT) [thread overview]
Message-ID: <20131007.173237.1669132001431607341.davem@davemloft.net> (raw)
In-Reply-To: <5253199B.3000109@nec-labs.com>
From: Steve Rago <sar@nec-labs.com>
Date: Mon, 7 Oct 2013 16:29:15 -0400
> On 10/07/2013 03:42 PM, David Miller wrote:
>> There is no compatability issue.
>>
>> 32-bit tasks will always see the 4-byte align/length.
>> 64-bit tasks will always see the 8-byte align/length.
>>
>
> Really? So when I compile my application on a 32-bit Linux box and
> then try to run it on a 64-bit Linux box, you're not going to overrun
> my buffer when CMSG_SPACE led me to allocate an insufficient amount of
> memory needed to account for padding on the 64-bit platform?
We have a compatability layer that gives 32-bit applications the
same behavior as if they had run on a 32-bit machine.
Search around for the MSG_MSG_COMPAT flag and how that is used in
net/socket.c
next prev parent reply other threads:[~2013-10-07 21:32 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-07 18:27 bug in passing file descriptors Steve Rago
2013-10-07 18:44 ` Andy Lutomirski
2013-10-07 19:06 ` Steve Rago
2013-10-07 19:12 ` David Miller
2013-10-07 19:17 ` Steve Rago
2013-10-07 19:42 ` David Miller
2013-10-07 20:29 ` Steve Rago
2013-10-07 21:32 ` David Miller [this message]
2013-10-07 22:55 ` Andi Kleen
2013-10-08 14:32 ` Steve Rago
2013-10-08 16:02 ` Andy Lutomirski
2013-10-08 16:18 ` Steve Rago
2013-10-08 16:41 ` Andi Kleen
2013-10-08 16:51 ` Steve Rago
2013-10-09 14:07 ` Steve Rago
2013-10-08 8:43 ` David Laight
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20131007.173237.1669132001431607341.davem@davemloft.net \
--to=davem@davemloft.net \
--cc=ebiederm@xmission.com \
--cc=luto@amacapital.net \
--cc=mtk.manpages@gmail.com \
--cc=netdev@vger.kernel.org \
--cc=sar@nec-labs.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).