linux-kernel - Re: [PATCH v2] brd: fix sleeping function called from invalid context in brd_insert

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-Id: <175137925672.318770.9783780559206172712.b4-ty@kernel.dk>
Date: Tue, 01 Jul 2025 08:14:16 -0600
From: Jens Axboe <axboe@...nel.dk>
To: hch@....de, yukuai3@...wei.com, Yu Kuai <yukuai1@...weicloud.com>
Cc: penguin-kernel@...ove.SAKURA.ne.jp, linux-block@...r.kernel.org, 
 linux-kernel@...r.kernel.org, yi.zhang@...wei.com, yangerkun@...wei.com, 
 johnny.chenyi@...wei.com
Subject: Re: [PATCH v2] brd: fix sleeping function called from invalid
 context in brd_insert_page()


On Mon, 30 Jun 2025 19:28:28 +0800, Yu Kuai wrote:
> __xa_cmpxchg() is called with rcu_read_lock(), and it will allocate
> memory if necessary.
> 
> Fix the problem by moving rcu_read_lock() after __xa_cmpxchg(), meanwhile,
> it still should be held before xa_unlock(), prevent returned page to be
> freed by concurrent discard.
> 
> [...]

Applied, thanks!

[1/1] brd: fix sleeping function called from invalid context in brd_insert_page()
      commit: 0d519bb0de3bf0ac9e6f401d4910fc119062d7be

Best regards,
-- 
Jens Axboe