linux-kernel - Re: [PATCH] MIPS: kernel: Clear FPU states when setting up kernel threads

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: <ZW9jI7gZRv/+qEce@alpha.franken.de>
Date:   Tue, 5 Dec 2023 18:51:31 +0100
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     stable@...r.kernel.org, Aurelien Jarno <aurel32@...ian.org>
Subject: Re: [PATCH] MIPS: kernel: Clear FPU states when setting up kernel
 threads

On Thu, Nov 30, 2023 at 05:36:01PM +0100, Thomas Bogendoerfer wrote:
> io_uring sets up the io worker kernel thread via a syscall out of an
> user space prrocess. This process might have used FPU and since
> copy_thread() didn't clear FPU states for kernel threads a BUG()
> is triggered for using FPU inside kernel. Move code around
> to always clear FPU state for user and kernel threads.
> 
> Cc: stable@...r.kernel.org
> Reported-by: Aurelien Jarno <aurel32@...ian.org>
> Closes: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1055021
> Signed-off-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> ---
>  arch/mips/kernel/process.c | 25 +++++++++++++------------
>  1 file changed, 13 insertions(+), 12 deletions(-)

applied to mips-fixes.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]