linux-kernel - Re: [PATCH 4/3] x86/fpu: don't use current->mm to check for a kthread

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

Date:   Tue, 11 Jun 2019 09:52:37 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Christoph Hellwig <hch@....de>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/3] x86/fpu: don't use current->mm to check for a kthread

On 2019-06-04 19:54:12 [+0200], Christoph Hellwig wrote:
> current->mm can be non-NULL if a kthread calls use_mm.  Check for
> PF_KTHREAD instead to decide when to store user mode FP state.
> 
> Fixes: 2722146eb784 ("x86/fpu: Remove fpu->initialized")
> Reported-by: Peter Zijlstra <peterz@...radead.org>
> Signed-off-by: Christoph Hellwig <hch@....de>

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

For the whole series.

Sebastian