sched: Introduce SCHED_RESET_ON_FORK scheduling policy flag

This patch introduces a new flag SCHED_RESET_ON_FORK which can be passed
to the kernel via sched_setscheduler(), ORed in the policy parameter. If
set this will make sure that when the process forks a) the scheduling
priority is reset to DEFAULT_PRIO if it was higher and b) the scheduling
policy is reset to SCHED_NORMAL if it was either SCHED_FIFO or SCHED_RR.

Why have this?

Currently, if a process is real-time scheduled this will 'leak' to all
its child processes. For security reasons it is often (always?) a good
idea to make sure that if a process acquires RT scheduling this is
confined to this process and only this process. More specifically this
makes the per-process resource limit RLIMIT_RTTIME useful for security
purposes, because it makes it impossible to use a fork bomb to
circumvent the per-process RLIMIT_RTTIME accounting.

This feature is also useful for tools like 'renice' which can then
change the nice level of a process without having this spill to all its
child processes.

Why expose this via sched_setscheduler() and not other syscalls such as
prctl() or sched_setparam()?

prctl() does not take a pid parameter. Due to that it would be
impossible to modify this flag for other processes than the current one.

The struct passed to sched_setparam() can unfortunately not be extended
without breaking compatibility, since sched_setparam() lacks a size
parameter.

How to use this from userspace? In your RT program simply replace this:

  sched_setscheduler(pid, SCHED_FIFO, &param);

by this:

  sched_setscheduler(pid, SCHED_FIFO|SCHED_RESET_ON_FORK, &param);

Signed-off-by: Lennart Poettering <lennart@poettering.net>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20090615152714.GA29092@tango.0pointer.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 46 insertions, 9 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 4896fdfec913..d4a2c6662f7d 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -38,6 +38,8 @@
 #define SCHED_BATCH             3
 /* SCHED_ISO: reserved but not implemented yet */
 #define SCHED_IDLE              5
+/* Can be ORed in to make sure the process is reverted back to SCHED_NORMAL on fork */
+#define SCHED_RESET_ON_FORK     0x40000000
 
 #ifdef __KERNEL__
 
@@ -1209,6 +1211,10 @@ struct task_struct {
         unsigned did_exec:1;
         unsigned in_execve:1;   /* Tell the LSMs that the process is doing an
                                  * execve */
+
+        /* Revert to default priority/policy when forking */
+        unsigned sched_reset_on_fork:1;
+
         pid_t pid;
         pid_t tgid;
 
diff --git a/kernel/sched.c b/kernel/sched.c
index 8ec9d13140be..32e6ede85255 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2613,12 +2613,28 @@ void sched_fork(struct task_struct *p, int clone_flags)
         set_task_cpu(p, cpu);
 
         /*
-         * Make sure we do not leak PI boosting priority to the child:
+         * Revert to default priority/policy on fork if requested. Make sure we
+         * do not leak PI boosting priority to the child.
          */
-        p->prio = current->normal_prio;
+        if (current->sched_reset_on_fork &&
+                        (p->policy == SCHED_FIFO || p->policy == SCHED_RR))
+                p->policy = SCHED_NORMAL;
+
+        if (current->sched_reset_on_fork &&
+                        (current->normal_prio < DEFAULT_PRIO))
+                p->prio = DEFAULT_PRIO;
+        else
+                p->prio = current->normal_prio;
+
         if (!rt_prio(p->prio))
                 p->sched_class = &fair_sched_class;
 
+        /*
+         * We don't need the reset flag anymore after the fork. It has
+         * fulfilled its duty:
+         */
+        p->sched_reset_on_fork = 0;
+
 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
         if (likely(sched_info_on()))
                 memset(&p->sched_info, 0, sizeof(p->sched_info));
@@ -6094,17 +6110,25 @@ static int __sched_setscheduler(struct task_struct *p, int policy,
         unsigned long flags;
         const struct sched_class *prev_class = p->sched_class;
         struct rq *rq;
+        int reset_on_fork;
 
         /* may grab non-irq protected spin_locks */
         BUG_ON(in_interrupt());
 recheck:
         /* double check policy once rq lock held */
-        if (policy < 0)
+        if (policy < 0) {
+                reset_on_fork = p->sched_reset_on_fork;
                 policy = oldpolicy = p->policy;
-        else if (policy != SCHED_FIFO && policy != SCHED_RR &&
-                        policy != SCHED_NORMAL && policy != SCHED_BATCH &&
-                        policy != SCHED_IDLE)
-                return -EINVAL;
+        } else {
+                reset_on_fork = !!(policy & SCHED_RESET_ON_FORK);
+                policy &= ~SCHED_RESET_ON_FORK;
+
+                if (policy != SCHED_FIFO && policy != SCHED_RR &&
+                                policy != SCHED_NORMAL && policy != SCHED_BATCH &&
+                                policy != SCHED_IDLE)
+                        return -EINVAL;
+        }
+
         /*
          * Valid priorities for SCHED_FIFO and SCHED_RR are
          * 1..MAX_USER_RT_PRIO-1, valid priority for SCHED_NORMAL,
@@ -6148,6 +6172,10 @@ recheck:
                 /* can't change other user's priorities */
                 if (!check_same_owner(p))
                         return -EPERM;
+
+                /* Normal users shall not reset the sched_reset_on_fork flag */
+                if (p->sched_reset_on_fork && !reset_on_fork)
+                        return -EPERM;
         }
 
         if (user) {
@@ -6191,6 +6219,8 @@ recheck:
         if (running)
                 p->sched_class->put_prev_task(rq, p);
 
+        p->sched_reset_on_fork = reset_on_fork;
+
         oldprio = p->prio;
         __setscheduler(rq, p, policy, param->sched_priority);
 
@@ -6307,14 +6337,15 @@ SYSCALL_DEFINE1(sched_getscheduler, pid_t, pid)
         if (p) {
                 retval = security_task_getscheduler(p);
                 if (!retval)
-                        retval = p->policy;
+                        retval = p->policy
+                                | (p->sched_reset_on_fork ? SCHED_RESET_ON_FORK : 0);
         }
         read_unlock(&tasklist_lock);
         return retval;
 }
 
 /**
- * sys_sched_getscheduler - get the RT priority of a thread
+ * sys_sched_getparam - get the RT priority of a thread
  * @pid: the pid in question.
  * @param: structure containing the RT priority.
  */