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From: Tristan Madani <tristmd@gmail.com>
To: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
	Andrew Morton <akpm@linux-foundation.org>
Cc: Ingo Molnar <mingo@elte.hu>,
	Dave Hansen <dave@linux.vnet.ibm.com>,
	linux-kernel@vger.kernel.org, stable@vger.kernel.org,
	Tristan Madani <tristan@talencesecurity.com>
Subject: Re: [PATCH] profiling: prevent stale prof_cpu_mask access on init failure
Date: Sun, 21 Jun 2026 23:45:37 -0000	[thread overview]
Message-ID: <178208553739.3350560.11630245626644331749@gmail.com> (raw)
In-Reply-To: <be257038-78f3-4a6c-8a57-237f5e2676bc@I-love.SAKURA.ne.jp>

On 2026/06/22 07:49, Tetsuo Handa wrote:
> NAK. This is a use-after-free read bug.
>
> Correct fix is to remove a commit which adds "free_cpumask_var(prof_cpu_mask);".

You're right, the flag check races with the free. v2 will just
remove the free_cpumask_var() call instead.

> Which tree are you talking about?

This is for stable (6.1.y, 6.6.y, 6.8.y) where prof_cpu_mask
still exists.

Thanks,
Tristan

  reply	other threads:[~2026-06-21 23:45 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-06-21 19:23 Tristan Madani
2026-06-21 22:49 ` Tetsuo Handa
2026-06-21 23:45   ` Tristan Madani [this message]
2026-06-22  0:00 ` [PATCH v2] profiling: don't free prof_cpu_mask " Tristan Madani
2026-06-22 11:32   ` Tetsuo Handa
2026-06-22 18:28     ` Tristan Madani
2026-06-22 22:50       ` Tetsuo Handa
2026-06-25  1:11   ` Andrew Morton
2026-06-26 15:36     ` Tristan Madani

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