mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-05 08:26:59 +00:00
Code Issues Releases Wiki Activity

ipv6: invert flowlabel sharing check in process and user mode

Browse source 
A request for a flowlabel fails in process or user exclusive mode must
fail if the caller pid or uid does not match. Invert the test.

Previously, the test was unsafe wrt PID recycling, but indeed tested
for inequality: fl1->owner != fl->owner

Fixes: 4f82f45730 ("net ip6 flowlabel: Make owner a union of struct pid* and kuid_t")
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Willem de Bruijn 2019-04-25 12:06:54 -04:00 committed by David S. Miller
parent 6ee12b7b15
commit 95c169251b
1 changed files with 2 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
net/ipv6/ip6_flowlabel.c
View file

@ -633,9 +633,9 @@ int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
if (fl1->share == IPV6_FL_S_EXCL ||
fl1->share != fl->share ||
((fl1->share == IPV6_FL_S_PROCESS) &&
(fl1->owner.pid == fl->owner.pid)) ||
(fl1->owner.pid != fl->owner.pid)) ||
((fl1->share == IPV6_FL_S_USER) &&
uid_eq(fl1->owner.uid, fl->owner.uid)))
!uid_eq(fl1->owner.uid, fl->owner.uid)))
goto release;
err = -ENOMEM;