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| author | Dhaval Giani <dhaval@linux.vnet.ibm.com> | 2009-02-27 15:13:54 +0530 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-02-27 11:11:53 +0100 |
| commit | 54e991242850edc8c53f71fa5aa3ba7a93ce38f5 (patch) | |
| tree | 7f136214aab690a8ee4a294ca9c1a7e01de0dc49 /include/linux/sched.h | |
| parent | cac64d00c256e65776d575e82aaf540632b66178 (diff) | |
| download | lwn-54e991242850edc8c53f71fa5aa3ba7a93ce38f5.tar.gz lwn-54e991242850edc8c53f71fa5aa3ba7a93ce38f5.zip | |
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>
Diffstat (limited to 'include/linux/sched.h')
| -rw-r--r-- | include/linux/sched.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 8981e52c714f..8c216e057c94 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -2291,9 +2291,13 @@ extern long sched_group_rt_runtime(struct task_group *tg); extern int sched_group_set_rt_period(struct task_group *tg, long rt_period_us); extern long sched_group_rt_period(struct task_group *tg); +extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk); #endif #endif +extern int task_can_switch_user(struct user_struct *up, + struct task_struct *tsk); + #ifdef CONFIG_TASK_XACCT static inline void add_rchar(struct task_struct *tsk, ssize_t amt) { |