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From:   Zhang Qiao <zhangqiao22@huawei.com>
To:     <mingo@redhat.com>, <peterz@infradead.org>, <tj@kernel.org>,
        <juri.lelli@redhat.com>, <vincent.guittot@linaro.org>
CC:     <linux-kernel@vger.kernel.org>
Subject: [PATCH v3] kernel/sched: Fix sched_fork() access an invalid sched_task_group
Date:   Wed, 15 Sep 2021 14:40:30 +0800
Message-ID: <20210915064030.2231-1-zhangqiao22@huawei.com>
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There is a small race between copy_process() and sched_fork()
where child->sched_task_group point to an already freed pointer.

parent doing fork()      | someone moving the parent
				to another cgroup
-------------------------------+-------------------------------
copy_process()
    + dup_task_struct()<1>
				parent move to another cgroup,
				and free the old cgroup. <2>
    + sched_fork()
      + __set_task_cpu()<3>
      + task_fork_fair()
        + sched_slice()<4>

In the worst case, this bug can lead to "use-after-free" and
cause panic as shown above,
(1)parent copy its sched_task_group to child at <1>;
(2)someone move the parent to another cgroup and free the old
   cgroup at <2>;
(3)the sched_task_group and cfs_rq that belong to the old cgroup
   will be accessed at <3> and <4>, which cause a panic:

[89249.732198] BUG: unable to handle kernel NULL pointer
dereference at 0000000000000000
[89249.732701] PGD 8000001fa0a86067 P4D 8000001fa0a86067 PUD
2029955067 PMD 0
[89249.733005] Oops: 0000 [#1] SMP PTI
[89249.733288] CPU: 7 PID: 648398 Comm: ebizzy Kdump: loaded
Tainted: G           OE    --------- -  - 4.18.0.x86_64+ #1
[89249.734318] RIP: 0010:sched_slice+0x84/0xc0
 ....
[89249.737910] Call Trace:
[89249.738181]  task_fork_fair+0x81/0x120
[89249.738457]  sched_fork+0x132/0x240
[89249.738732]  copy_process.part.5+0x675/0x20e0
[89249.739010]  ? __handle_mm_fault+0x63f/0x690
[89249.739286]  _do_fork+0xcd/0x3b0
[89249.739558]  do_syscall_64+0x5d/0x1d0
[89249.739830]  entry_SYSCALL_64_after_hwframe+0x65/0xca
[89249.740107] RIP: 0033:0x7f04418cd7e1

Between cgroup_can_fork() and cgroup_post_fork(), the cgroup
membership and thus sched_task_group can't change. So update
child's sched_task_group at sched_post_fork() and move task_fork()
and __set_task_cpu() (where accees the sched_task_group) from
sched_fork() to sched_post_fork().

Fixes: 8323f26ce342 ("sched: Fix race in task_group")
Signed-off-by: Zhang Qiao <zhangqiao22@huawei.com>
---
 include/linux/sched/task.h |  3 ++-
 kernel/fork.c              |  2 +-
 kernel/sched/core.c        | 43 +++++++++++++++++++-------------------
 3 files changed, 25 insertions(+), 23 deletions(-)

diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h
index ef02be869cf2..ba88a6987400 100644
--- a/include/linux/sched/task.h
+++ b/include/linux/sched/task.h
@@ -54,7 +54,8 @@ extern asmlinkage void schedule_tail(struct task_struct *prev);
 extern void init_idle(struct task_struct *idle, int cpu);
 
 extern int sched_fork(unsigned long clone_flags, struct task_struct *p);
-extern void sched_post_fork(struct task_struct *p);
+extern void sched_post_fork(struct task_struct *p,
+			    struct kernel_clone_args *kargs);
 extern void sched_dead(struct task_struct *p);
 
 void __noreturn do_task_dead(void);
diff --git a/kernel/fork.c b/kernel/fork.c
index 38681ad44c76..0e4251dc5436 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -2405,7 +2405,7 @@ static __latent_entropy struct task_struct *copy_process(
 	write_unlock_irq(&tasklist_lock);
 
 	proc_fork_connector(p);
-	sched_post_fork(p);
+	sched_post_fork(p, args);
 	cgroup_post_fork(p, args);
 	perf_event_fork(p);
 
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index c4462c454ab9..57544053be5a 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4328,8 +4328,6 @@ int sysctl_schedstats(struct ctl_table *table, int write, void *buffer,
  */
 int sched_fork(unsigned long clone_flags, struct task_struct *p)
 {
-	unsigned long flags;
-
 	__sched_fork(clone_flags, p);
 	/*
 	 * We mark the process as NEW here. This guarantees that
@@ -4375,24 +4373,6 @@ int sched_fork(unsigned long clone_flags, struct task_struct *p)
 
 	init_entity_runnable_average(&p->se);
 
-	/*
-	 * The child is not yet in the pid-hash so no cgroup attach races,
-	 * and the cgroup is pinned to this child due to cgroup_fork()
-	 * is ran before sched_fork().
-	 *
-	 * Silence PROVE_RCU.
-	 */
-	raw_spin_lock_irqsave(&p->pi_lock, flags);
-	rseq_migrate(p);
-	/*
-	 * We're setting the CPU for the first time, we don't migrate,
-	 * so use __set_task_cpu().
-	 */
-	__set_task_cpu(p, smp_processor_id());
-	if (p->sched_class->task_fork)
-		p->sched_class->task_fork(p);
-	raw_spin_unlock_irqrestore(&p->pi_lock, flags);
-
 #ifdef CONFIG_SCHED_INFO
 	if (likely(sched_info_on()))
 		memset(&p->sched_info, 0, sizeof(p->sched_info));
@@ -4408,8 +4388,29 @@ int sched_fork(unsigned long clone_flags, struct task_struct *p)
 	return 0;
 }
 
-void sched_post_fork(struct task_struct *p)
+void sched_post_fork(struct task_struct *p, struct kernel_clone_args *kargs)
 {
+	unsigned long flags;
+#ifdef CONFIG_CGROUP_SCHED
+	struct task_group *tg;
+#endif
+
+	raw_spin_lock_irqsave(&p->pi_lock, flags);
+#ifdef CONFIG_CGROUP_SCHED
+	tg = container_of(kargs->cset->subsys[cpu_cgrp_id],
+			  struct task_group, css);
+	p->sched_task_group = autogroup_task_group(p, tg);
+#endif
+	rseq_migrate(p);
+	/*
+	 * We're setting the CPU for the first time, we don't migrate,
+	 * so use __set_task_cpu().
+	 */
+	__set_task_cpu(p, smp_processor_id());
+	if (p->sched_class->task_fork)
+		p->sched_class->task_fork(p);
+	raw_spin_unlock_irqrestore(&p->pi_lock, flags);
+
 	uclamp_post_fork(p);
 }
 
-- 
2.25.1