Commit-ID:  438367fbfe307f2c26ee8e490f1fb9eacb6b6b02
Gitweb:     http://git.kernel.org/tip/438367fbfe307f2c26ee8e490f1fb9eacb6b6b02
Author:     Peter Zijlstra <pet...@infradead.org>
AuthorDate: Fri, 9 May 2014 10:49:03 +0200
Committer:  Thomas Gleixner <t...@linutronix.de>
CommitDate: Mon, 19 May 2014 21:47:33 +0900

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.

Cc: sta...@vger.kernel.org
Reported-by: Michael Kerrisk <mtk.manpa...@gmail.com>
Acked-by: Michael Kerrisk <mtk.manpa...@gmail.com>
Signed-off-by: Peter Zijlstra <pet...@infradead.org>
Link: 
http://lkml.kernel.org/r/20140509085311.gj30...@twins.programming.kicks-ass.net
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
---
 kernel/sched/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index f2205f0..cdefcf7 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -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);
--
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