From: Rich Felker <dalias@aerifal.cx>
To: musl@lists.openwall.com
Subject: Re: openssh and sendmsg() problem
Date: Tue, 26 Jun 2012 15:08:23 -0400 [thread overview]
Message-ID: <20120626190823.GL544@brightrain.aerifal.cx> (raw)
In-Reply-To: <20120627021640.42af7e4f@sibserver.ru>
On Wed, Jun 27, 2012 at 02:16:40AM +0800, orc wrote:
> On Tue, 26 Jun 2012 13:32:05 -0400
> Rich Felker <dalias@aerifal.cx> wrote:
>
> > On Wed, Jun 27, 2012 at 01:24:41AM +0800, orc wrote:
> > > On Tue, 26 Jun 2012 12:01:06 -0400
> > > Rich Felker <dalias@aerifal.cx> wrote:
> > >
> > > > On Tue, Jun 26, 2012 at 02:00:17PM +0200, Szabolcs Nagy wrote:
> > > > > * orc <orc@sibserver.ru> [2012-06-26 19:01:46 +0800]:
> > > > > > strace shows that sendmsg system call returns EINVAL:
> > > > > >
> > > > > > sendmsg(5, {msg_name(0)=NULL, msg_iov(1)=[{"\0", 1}],
> > > > > > msg_controllen=24, {cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_
> > > > > > type=SCM_RIGHTS, {4, 385875968}}, msg_flags=0}, 0) = -1 EINVAL
> > > > > > (Invalid argument)
> > > > > >
>
> strace from glibc system on this syscall:
>
> sendmsg(5, {msg_name(0)=NULL, msg_iov(1)=[{"\0", 1}], msg_controllen=24, {cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, {4}}, msg_flags=0}, 0) = 1
> sendmsg(5, {msg_name(0)=NULL, msg_iov(1)=[{"\0", 1}], msg_controllen=24, {cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, {6}}, msg_flags=0}, 0) = 1
I don't quite understand this from the strace, but it looks like
there's an issue with the size of cmsg structures on 64-bit machines
due to another buggy kernel socklen_t/size_t mismatch. I'm not sure
how it can be worked around, but musl's failure to work around it is a
flaw that needs to be fixed. glibc just violates POSIX and defines
the wrong type.
Rich
next prev parent reply other threads:[~2012-06-26 19:08 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-26 11:01 orc
2012-06-26 12:00 ` Szabolcs Nagy
2012-06-26 16:01 ` Rich Felker
2012-06-26 17:24 ` orc
2012-06-26 17:32 ` Rich Felker
2012-06-26 18:16 ` orc
2012-06-26 19:08 ` Rich Felker [this message]
2012-06-26 19:39 ` orc
2012-06-26 20:40 ` Szabolcs Nagy
2012-06-26 21:13 ` Rich Felker
2012-07-01 10:23 ` orc
2012-06-26 18:32 ` John Spencer
2012-06-26 18:34 ` orc
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=20120626190823.GL544@brightrain.aerifal.cx \
--to=dalias@aerifal.cx \
--cc=musl@lists.openwall.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.
Code repositories for project(s) associated with this public inbox
https://git.vuxu.org/mirror/musl/
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).