linux-kernel - [PATCH] drm/xe: replace format-less snprintf() with strscpy()

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Date: Tue, 28 May 2024 15:32:36 +0200
From: Arnd Bergmann <arnd@...nel.org>
To: Lucas De Marchi <lucas.demarchi@...el.com>,
	Oded Gabbay <ogabbay@...nel.org>,
	Thomas Hellström <thomas.hellstrom@...ux.intel.com>
Cc: Arnd Bergmann <arnd@...db.de>,
	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>,
	Rodrigo Vivi <rodrigo.vivi@...el.com>,
	José Roberto de Souza <jose.souza@...el.com>,
	Matthew Brost <matthew.brost@...el.com>,
	Francois Dugast <francois.dugast@...el.com>,
	Himal Prasad Ghimiray <himal.prasad.ghimiray@...el.com>,
	intel-xe@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] drm/xe: replace format-less snprintf() with strscpy()

From: Arnd Bergmann <arnd@...db.de>

Using snprintf() with a format string from task->comm is a bit
dangerous since the string may be controlled by unprivileged
userspace:

drivers/gpu/drm/xe/xe_devcoredump.c: In function 'devcoredump_snapshot':
drivers/gpu/drm/xe/xe_devcoredump.c:184:9: error: format not a string literal and no format arguments [-Werror=format-security]
  184 |         snprintf(ss->process_name, sizeof(ss->process_name), process_name);
      |         ^~~~~~~~

In this case there is no reason for an snprintf(), so use a simpler
string copy.

Fixes: b10d0c5e9df7 ("drm/xe: Add process name to devcoredump")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/gpu/drm/xe/xe_devcoredump.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/xe_devcoredump.c b/drivers/gpu/drm/xe/xe_devcoredump.c
index 1643d44f8bc4..1973bfaece40 100644
--- a/drivers/gpu/drm/xe/xe_devcoredump.c
+++ b/drivers/gpu/drm/xe/xe_devcoredump.c
@@ -181,7 +181,7 @@ static void devcoredump_snapshot(struct xe_devcoredump *coredump,
 		if (task)
 			process_name = task->comm;
 	}
-	snprintf(ss->process_name, sizeof(ss->process_name), process_name);
+	strscpy(ss->process_name, process_name);
 	if (task)
 		put_task_struct(task);
 
-- 
2.39.2