netdev - Re: [PATCH v2 net] net_sched: gen_estimator: fix est_timer() vs CONFIG_PREEMPT

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <20250828062852.7LnXu1qK@linutronix.de>
Date: Thu, 28 Aug 2025 08:28:52 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Eric Dumazet <edumazet@...gle.com>
Cc: "David S . Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Cong Wang <xiyou.wangcong@...il.com>, Jiri Pirko <jiri@...nulli.us>,
	netdev@...r.kernel.org, eric.dumazet@...il.com,
	syzbot+72db9ee39db57c3fecc5@...kaller.appspotmail.com
Subject: Re: [PATCH v2 net] net_sched: gen_estimator: fix est_timer() vs
 CONFIG_PREEMPT_RT=y

On 2025-08-27 16:23:52 [+0000], Eric Dumazet wrote:
> syzbot reported a WARNING in est_timer() [1]
> 
> Problem here is that with CONFIG_PREEMPT_RT=y, timer callbacks
> can be preempted.
> 
> Adopt preempt_disable_nested()/preempt_enable_nested() to fix this.
…
> Fixes: d2d6422f8bd1 ("x86: Allow to enable PREEMPT_RT.")
> Reported-by: syzbot+72db9ee39db57c3fecc5@...kaller.appspotmail.com
> Closes: https://lore.kernel.org/netdev/68adf6fa.a70a0220.3cafd4.0000.GAE@google.com/T/#u
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

Reviewed-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

Sebastian