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	3662	if (retval)
3663	3663	return retval;
3664	3664
	3665	+ if (attr.sched_policy < 0)
	3666	+ return -EINVAL;
	3667	+
3665	3668	rcu_read_lock();
3666	3669	retval = -ESRCH;
3667	3670	p = find_process_by_pid(pid);