netdev - [net PATCH v3 2/3] net: netprio: fd passed in SCM

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Message-ID: <20120814223430.3551.88909.stgit@jf-dev1-dcblab>
Date:	Tue, 14 Aug 2012 15:34:30 -0700
From:	John Fastabend <john.r.fastabend@...el.com>
To:	viro@...IV.linux.org.uk, nhorman@...driver.com
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	linux-kernel@...r.kernel.org, joe@...ches.com
Subject: [net PATCH v3 2/3] net: netprio: fd passed in SCM_RIGHTS datagram not
	set correctly

A socket fd passed in a SCM_RIGHTS datagram was not getting
updated with the new tasks cgrp prioidx. This leaves IO on
the socket tagged with the old tasks priority.

To fix this add a check in the scm recvmsg path to update the
sock cgrp prioidx with the new tasks value.

Thanks to Al Viro for catching this.

CC: Neil Horman <nhorman@...driver.com>
Reported-by: Al Viro <viro@...IV.linux.org.uk>
Signed-off-by: John Fastabend <john.r.fastabend@...el.com>
---

 net/core/scm.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/net/core/scm.c b/net/core/scm.c
index 8f6ccfd..040cebe 100644
--- a/net/core/scm.c
+++ b/net/core/scm.c
@@ -265,6 +265,7 @@ void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm)
 	for (i=0, cmfptr=(__force int __user *)CMSG_DATA(cm); i<fdmax;
 	     i++, cmfptr++)
 	{
+		struct socket *sock;
 		int new_fd;
 		err = security_file_receive(fp[i]);
 		if (err)
@@ -281,6 +282,9 @@ void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm)
 		}
 		/* Bump the usage count and install the file. */
 		get_file(fp[i]);
+		sock = sock_from_file(fp[i], &err);
+		if (sock)
+			sock_update_netprioidx(sock->sk, current);
 		fd_install(new_fd, fp[i]);
 	}
 

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