Messages in this thread | | | Date | Tue, 14 Aug 2012 07:35:52 -0700 | From | John Fastabend <> | Subject | Re: [net PATCH v2 2/2] net: netprio: fd passed in SCM_RIGHTS datagram not set correctly |
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On 8/14/2012 5:55 AM, Neil Horman wrote: > 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> >> --- >>
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>> @@ -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 >
OK but then I should also make sock_update_netprioidx inline and drop the in_interrupt() call. I'll send a v3 with this change and also a third patch to fix a race between write_priomap and cgrp_create (also spotted by Al Viro).
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