tree 7f136214aab690a8ee4a294ca9c1a7e01de0dc49
parent cac64d00c256e65776d575e82aaf540632b66178
author Dhaval Giani <dhaval@linux.vnet.ibm.com> 1235727834 +0530
committer Ingo Molnar <mingo@elte.hu> 1235729513 +0100

sched: don't allow setuid to succeed if the user does not have rt bandwidth

Impact: fix hung task with certain (non-default) rt-limit settings

Corey Hickey reported that on using setuid to change the uid of a
rt process, the process would be unkillable and not be running.
This is because there was no rt runtime for that user group. Add
in a check to see if a user can attach an rt task to its task group.
On failure, return EINVAL, which is also returned in
CONFIG_CGROUP_SCHED.

Reported-by: Corey Hickey <bugfood-ml@fatooh.org>
Signed-off-by: Dhaval Giani <dhaval@linux.vnet.ibm.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>