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SubjectRe: [net PATCH v2 2/2] net: netprio: fd passed in SCM_RIGHTS datagram not set correctly
On Mon, Aug 13, 2012 at 07:43:27PM -0700, John Fastabend wrote:
> 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>
> ---
>
> net/core/scm.c | 5 +++++
> 1 files changed, 5 insertions(+), 0 deletions(-)
>
> diff --git a/net/core/scm.c b/net/core/scm.c
> index 8f6ccfd..a14d9e2 100644
> --- a/net/core/scm.c
> +++ b/net/core/scm.c
> @@ -249,6 +249,7 @@ void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm)
> struct file **fp = scm->fp->fp;
> int __user *cmfptr;
> int err = 0, i;
> + __u32 prioidx = task_netprioidx(current);
>
> if (MSG_CMSG_COMPAT & msg->msg_flags) {
> scm_detach_fds_compat(msg, scm);
> @@ -265,6 +266,7 @@ 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 +283,9 @@ 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->sk->sk_cgrp_prioidx = prioidx;
nit: You can replace the prioidx variable above and this set with a call to
sock_update_netprioidx

Neil



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