linux-kernel - [tip: locking/urgent] futex: Prevent use-after-free during requeue-PI

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Message-ID: <175838300091.709179.9644244636542469203.tip-bot2@tip-bot2>
Date: Sat, 20 Sep 2025 15:43:20 -0000
From: "tip-bot2 for Sebastian Andrzej Siewior" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: syzbot+034246a838a10d181e78@...kaller.appspotmail.com,
 Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
 Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: locking/urgent] futex: Prevent use-after-free during requeue-PI

The following commit has been merged into the locking/urgent branch of tip:

Commit-ID:     b549113738e8c751b613118032a724b772aa83f2
Gitweb:        https://git.kernel.org/tip/b549113738e8c751b613118032a724b772aa83f2
Author:        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
AuthorDate:    Wed, 10 Sep 2025 12:42:43 +02:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Sat, 20 Sep 2025 17:40:42 +02:00

futex: Prevent use-after-free during requeue-PI

syzbot managed to trigger the following race:

   T1                               T2

 futex_wait_requeue_pi()
   futex_do_wait()
     schedule()
                               futex_requeue()
                                 futex_proxy_trylock_atomic()
                                   futex_requeue_pi_prepare()
                                   requeue_pi_wake_futex()
                                     futex_requeue_pi_complete()
                                      /* preempt */

         * timeout/ signal wakes T1 *

   futex_requeue_pi_wakeup_sync() // Q_REQUEUE_PI_LOCKED
   futex_hash_put()
  // back to userland, on stack futex_q is garbage

                                      /* back */
                                     wake_up_state(q->task, TASK_NORMAL);

In this scenario futex_wait_requeue_pi() is able to leave without using
futex_q::lock_ptr for synchronization.

This can be prevented by reading futex_q::task before updating the
futex_q::requeue_state. A reference on the task_struct is not needed
because requeue_pi_wake_futex() is invoked with a spinlock_t held which
implies a RCU read section.

Even if T1 terminates immediately after, the task_struct will remain valid
during T2's wake_up_state().  A READ_ONCE on futex_q::task before
futex_requeue_pi_complete() is enough because it ensures that the variable
is read before the state is updated.

Read futex_q::task before updating the requeue state, use it for the
following wakeup.

Fixes: 07d91ef510fb1 ("futex: Prevent requeue_pi() lock nesting issue on RT")
Reported-by: syzbot+034246a838a10d181e78@...kaller.appspotmail.com
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Closes: https://lore.kernel.org/all/68b75989.050a0220.3db4df.01dd.GAE@google.com/
---
 kernel/futex/requeue.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/futex/requeue.c b/kernel/futex/requeue.c
index c716a66..d818b4d 100644
--- a/kernel/futex/requeue.c
+++ b/kernel/futex/requeue.c
@@ -230,8 +230,9 @@ static inline
 void requeue_pi_wake_futex(struct futex_q *q, union futex_key *key,
 			   struct futex_hash_bucket *hb)
 {
-	q->key = *key;
+	struct task_struct *task;
 
+	q->key = *key;
 	__futex_unqueue(q);
 
 	WARN_ON(!q->rt_waiter);
@@ -243,10 +244,11 @@ void requeue_pi_wake_futex(struct futex_q *q, union futex_key *key,
 	futex_hash_get(hb);
 	q->drop_hb_ref = true;
 	q->lock_ptr = &hb->lock;
+	task = READ_ONCE(q->task);
 
 	/* Signal locked state to the waiter */
 	futex_requeue_pi_complete(q, 1);
-	wake_up_state(q->task, TASK_NORMAL);
+	wake_up_state(task, TASK_NORMAL);
 }
 
 /**