linux-kernel - [PATCH v6 0/2] sched: Fix dup_user_cpus_ptr() & do_set_cpus

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Message-Id: <20221231041120.440785-1-longman@redhat.com>
Date:   Fri, 30 Dec 2022 23:11:18 -0500
From:   Waiman Long <longman@...hat.com>
To:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Valentin Schneider <vschneid@...hat.com>
Cc:     Phil Auld <pauld@...hat.com>,
        Wenjie Li <wenjieli@....qualcomm.com>,
        David Wang 王标 
        <wangbiao3@...omi.com>, Quentin Perret <qperret@...gle.com>,
        Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org,
        Waiman Long <longman@...hat.com>
Subject: [PATCH v6 0/2] sched: Fix dup_user_cpus_ptr() & do_set_cpus_allowed() bugs

 v6:
  - Update patch 2 to fix build error with !CONFIG_SMP configs.

 v5:
  - Add an alloc_user_cpus_ptr() helper and use it in patch 2.

 v4:
  - Make sure user_cpus_ptr allocation size is large enough for
    rcu_head.

This series fixes a UAF bug in dup_user_cpus_ptr() and uses kfree_rcu()
in do_set_cpus_allowed to avoid lockdep splats.

Waiman Long (2):
  sched: Fix use-after-free bug in dup_user_cpus_ptr()
  sched: Use kfree_rcu() in do_set_cpus_allowed()

 kernel/sched/core.c | 65 +++++++++++++++++++++++++++++++++++++++------
 1 file changed, 57 insertions(+), 8 deletions(-)

-- 
2.31.1