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Commit dbdb2275 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

sched: Disallow sched_attr::sched_policy < 0 



The scheduler uses policy=-1 to preserve the current policy state to
implement sys_sched_setparam(), this got exposed to userspace by
accident through sys_sched_setattr(), cure this.

Reported-by: default avatarMichael Kerrisk <mtk.manpages@gmail.com>
Signed-off-by: default avatarPeter Zijlstra <peterz@infradead.org>
Acked-by: default avatarMichael Kerrisk <mtk.manpages@gmail.com>
Cc: <stable@vger.kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/20140509085311.GJ30445@twins.programming.kicks-ass.net


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 143cf23d

kernel/sched/core.c

+3 −0
Original line number Diff line number Diff line
@@ -3662,6 +3662,9 @@ SYSCALL_DEFINE3(sched_setattr, pid_t, pid, struct sched_attr __user *, uattr, 
	if (retval)

		return retval;



	if (attr.sched_policy < 0)

		return -EINVAL;



	rcu_read_lock();

	retval = -ESRCH;

	p = find_process_by_pid(pid);