linux-kernel - Re: [PATCH 5/7] drm/pan*: don't abuse current->group

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]

Message-ID: <20251208092343.2cbca352@fedora>
Date: Mon, 8 Dec 2025 09:23:43 +0100
From: Boris Brezillon <boris.brezillon@...labora.com>
To: Oleg Nesterov <oleg@...hat.com>
Cc: Todd Kjos <tkjos@...roid.com>, Martijn Coenen <maco@...roid.com>, Joel
 Fernandes <joelagnelf@...dia.com>, Christian Brauner <brauner@...nel.org>,
 Carlos Llamas <cmllamas@...gle.com>, Suren Baghdasaryan
 <surenb@...gle.com>, Felix Kuehling <Felix.Kuehling@....com>, Alex Deucher
 <alexander.deucher@....com>, Christian König
 <christian.koenig@....com>, David Airlie <airlied@...il.com>, Simona Vetter
 <simona@...ll.ch>, Rob Herring <robh@...nel.org>, Steven Price
 <steven.price@....com>, Adrián Larumbe
 <adrian.larumbe@...labora.com>, Maarten Lankhorst
 <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
 Thomas Zimmermann <tzimmermann@...e.de>, Liviu Dudau <liviu.dudau@....com>,
 Jason Gunthorpe <jgg@...pe.ca>, Leon Romanovsky <leon@...nel.org>, "David
 S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub
 Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 linux-kernel@...r.kernel.org, amd-gfx@...ts.freedesktop.org,
 dri-devel@...ts.freedesktop.org, linux-rdma@...r.kernel.org,
 netdev@...r.kernel.org
Subject: Re: [PATCH 5/7] drm/pan*: don't abuse current->group_leader

On Sun, 7 Dec 2025 13:39:53 +0100
Oleg Nesterov <oleg@...hat.com> wrote:

> Cleanup and preparation to simplify the next changes.
> 
> Use current->tgid instead of current->group_leader->pid.
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>
> ---
>  drivers/gpu/drm/panfrost/panfrost_gem.c | 2 +-
>  drivers/gpu/drm/panthor/panthor_gem.c   | 2 +-

Acked-by: Boris Brezillon <boris.brezillon@...labora.com>

>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.c b/drivers/gpu/drm/panfrost/panfrost_gem.c
> index 8041b65c6609..1ff1f2c8b726 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_gem.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_gem.c
> @@ -17,7 +17,7 @@
>  static void panfrost_gem_debugfs_bo_add(struct panfrost_device *pfdev,
>  					struct panfrost_gem_object *bo)
>  {
> -	bo->debugfs.creator.tgid = current->group_leader->pid;
> +	bo->debugfs.creator.tgid = current->tgid;
>  	get_task_comm(bo->debugfs.creator.process_name, current->group_leader);
>  
>  	mutex_lock(&pfdev->debugfs.gems_lock);
> diff --git a/drivers/gpu/drm/panthor/panthor_gem.c b/drivers/gpu/drm/panthor/panthor_gem.c
> index fbde78db270a..29cc57efc4b9 100644
> --- a/drivers/gpu/drm/panthor/panthor_gem.c
> +++ b/drivers/gpu/drm/panthor/panthor_gem.c
> @@ -27,7 +27,7 @@ static void panthor_gem_debugfs_bo_add(struct panthor_gem_object *bo)
>  	struct panthor_device *ptdev = container_of(bo->base.base.dev,
>  						    struct panthor_device, base);
>  
> -	bo->debugfs.creator.tgid = current->group_leader->pid;
> +	bo->debugfs.creator.tgid = current->tgid;
>  	get_task_comm(bo->debugfs.creator.process_name, current->group_leader);
>  
>  	mutex_lock(&ptdev->gems.lock);