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.

Peter Zijlstra committed 12 years ago

Commit dbdb2271 parent 143cf231 file · +3 −0Browse files

Unified · Split

kernel/sched/core.c+3−0

@@ -3662,6 +3662,9 @@ SYSCALL_DEFINE3(sched_setattr, pid_t, pid, struct sched_attr __user *, uattr, · 3661 unmodified lines
3662	if (retval)	3662	if (retval)
3663	return retval;	3663	return retval;
3664		3664
		3665	if (attr.sched_policy < 0)
		3666	return -EINVAL;
		3667
3665	rcu_read_lock();	3668	rcu_read_lock();
3666	retval = -ESRCH;	3669	retval = -ESRCH;
3667	p = find_process_by_pid(pid);	3670	p = find_process_by_pid(pid);