linux-kernel - Re: [PATCH] s390/debug: Replace kmalloc() + copy_from_user() with memdup_user

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Message-ID: <d228ead4-c37e-4728-b1ec-a2d61ccd1f1e-agordeev@linux.ibm.com>
Date: Mon, 8 Sep 2025 13:50:03 +0200
From: Alexander Gordeev <agordeev@...ux.ibm.com>
To: Thorsten Blum <thorsten.blum@...ux.dev>
Cc: Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>, Halil Pasic <pasic@...ux.ibm.com>,
        Niklas Schnelle <schnelle@...ux.ibm.com>,
        "Bill O'Donnell" <bodonnel@...hat.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Tigran Mkrtchyan <tigran.mkrtchyan@...y.de>,
        Joel Granados <joel.granados@...nel.org>, Wei Liu <wei.liu@...nel.org>,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] s390/debug: Replace kmalloc() + copy_from_user() with
 memdup_user_nul()

On Thu, Sep 04, 2025 at 01:40:29PM +0200, Thorsten Blum wrote:
> Replace kmalloc() followed by copy_from_user() with memdup_user_nul() to
> improve and simplify debug_get_user_string(). Remove the manual
> NUL-termination.
> 
> No functional changes intended.
> 
> Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>
> ---
>  arch/s390/kernel/debug.c | 12 +++---------
>  1 file changed, 3 insertions(+), 9 deletions(-)

Applied, thanks!