netdev - Re: [PATCH v3 11/11] drm: Replace strcpy() with __get_task

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Date: Fri, 21 Jun 2024 18:39:26 +0200
From: Daniel Vetter <daniel@...ll.ch>
To: Yafang Shao <laoar.shao@...il.com>
Cc: torvalds@...ux-foundation.org, ebiederm@...ssion.com,
	alexei.starovoitov@...il.com, rostedt@...dmis.org,
	catalin.marinas@....com, akpm@...ux-foundation.org,
	penguin-kernel@...ove.sakura.ne.jp, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
	audit@...r.kernel.org, linux-security-module@...r.kernel.org,
	selinux@...r.kernel.org, bpf@...r.kernel.org,
	netdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH v3 11/11] drm: Replace strcpy() with __get_task_comm()

On Fri, Jun 21, 2024 at 10:29:59AM +0800, Yafang Shao wrote:
> To prevent erros from occurring when the src string is longer than the
> dst string in strcpy(), we should use __get_task_comm() instead. This
> approach also facilitates future extensions to the task comm.
> 
> Signed-off-by: Yafang Shao <laoar.shao@...il.com>
> Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
> Cc: Maxime Ripard <mripard@...nel.org>
> Cc: Thomas Zimmermann <tzimmermann@...e.de>
> Cc: David Airlie <airlied@...il.com>
> Cc: Daniel Vetter <daniel@...ll.ch>

I guess the entire series will go in through a dedicated pull or some
other tree, so

Acked-by: Daniel Vetter <daniel.vetter@...ll.ch>

for merging through whatever non-drm tree makes most sense for this.

Cheers, Sima

> ---
>  drivers/gpu/drm/drm_framebuffer.c     | 2 +-
>  drivers/gpu/drm/i915/i915_gpu_error.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
> index 888aadb6a4ac..25262b07ffaf 100644
> --- a/drivers/gpu/drm/drm_framebuffer.c
> +++ b/drivers/gpu/drm/drm_framebuffer.c
> @@ -868,7 +868,7 @@ int drm_framebuffer_init(struct drm_device *dev, struct drm_framebuffer *fb,
>  	INIT_LIST_HEAD(&fb->filp_head);
>  
>  	fb->funcs = funcs;
> -	strcpy(fb->comm, current->comm);
> +	__get_task_comm(fb->comm, sizeof(fb->comm), current);
>  
>  	ret = __drm_mode_object_add(dev, &fb->base, DRM_MODE_OBJECT_FB,
>  				    false, drm_framebuffer_free);
> diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
> index 625b3c024540..b2c16a53bd24 100644
> --- a/drivers/gpu/drm/i915/i915_gpu_error.c
> +++ b/drivers/gpu/drm/i915/i915_gpu_error.c
> @@ -1411,7 +1411,7 @@ static bool record_context(struct i915_gem_context_coredump *e,
>  	rcu_read_lock();
>  	task = pid_task(ctx->pid, PIDTYPE_PID);
>  	if (task) {
> -		strcpy(e->comm, task->comm);
> +		__get_task_comm(e->comm, sizeof(e->comm), task);
>  		e->pid = task->pid;
>  	}
>  	rcu_read_unlock();
> -- 
> 2.39.1
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch