Bug 12323

Summary:	recv() with MSG_PEEK on an AF_UNIX socket only reads a single skb
Product:	Networking	Reporter:	Henri Verbeet (hverbeet)
Component:	Other	Assignee:	Arnaldo Carvalho de Melo (acme)
Status:	REOPENED ---
Severity:	normal	CC:	aconole, alan, sidney
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	3.5.0	Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	Test case

Description Henri Verbeet 2008-12-29 08:57:45 UTC

As described in the LKML thread at http://lkml.org/lkml/2008/1/8/444, calling recv() with MSG_PEEK on an AF_UNIX socket only reads a single skb. Wine uses AF_UNIX sockets for its named pipe implementation and runs into this bug. The patch posted at http://lkml.org/lkml/2008/1/10/436 works for me, but probably doesn't handle fd passing correctly, as the mail already mentions.

Comment 1 Alan 2012-10-30 15:41:47 UTC

If this is still seen on modern kernels then please re-open/update

Comment 2 Sidney San Martín 2014-02-09 22:53:53 UTC

Created attachment 125431 [details]
Test case

This still exists on modern kernels (tried 3.5.0-17-generic), it'd be awesome if it could be fixed.

Here's a short Python script to demonstrate the problem. It passes on FreeBSD and Mac OS.

Comment 3 Aaron Conole 2015-10-06 15:04:40 UTC

This bug can be resolved with the following commits: 

- 4613012db1d911f80897f9446a49de817b2c4c47
- 9f389e35674f5b086edd70ed524ca0f287259725
- e9193d60d363e4dff75ff6d43a48f22be26d59c7