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authorJohn Fastabend <john.r.fastabend@intel.com>2012-08-14 12:34:30 (GMT)
committerDavid S. Miller <davem@davemloft.net>2012-08-16 21:56:11 (GMT)
commit48a87cc26c13b68f6cce4e9d769fcb17a6b3e4b8 (patch)
treed3b54c7b7748fecd44cdd7553c95f299cc6274f7 /net
parentf796c20cf67aa54c9130d0dc41307c0025719b85 (diff)
downloadlinux-48a87cc26c13b68f6cce4e9d769fcb17a6b3e4b8.tar.xz
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@tuxdriver.com> Reported-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: John Fastabend <john.r.fastabend@intel.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/scm.c4
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]);
}