From: Matthew Auld <matthew.auld@xxxxxxxxx>
commit 67801fa67b94ebd0e4da7a77ac2d9f321b75fbe0 upstream.
Evil user can guess the next id of the queue before the ioctl completes
and then call queue destroy ioctl to trigger UAF since create ioctl is
still referencing the same queue. Move the xa_alloc all the way to the end
to prevent this.
v2:
- Rebase
Fixes: 2149ded63079 ("drm/xe: Fix use after free when client stats are captured")
Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx>
Cc: Matthew Brost <matthew.brost@xxxxxxxxx>
Reviewed-by: Nirmoy Das <nirmoy.das@xxxxxxxxx>
Reviewed-by: Matthew Brost <matthew.brost@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20240925071426.144015-4-matthew.auld@xxxxxxxxx
(cherry picked from commit 16536582ddbebdbdf9e1d7af321bbba2bf955a87)
Signed-off-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
---
drivers/gpu/drm/xe/xe_exec_queue.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/xe/xe_exec_queue.c b/drivers/gpu/drm/xe/xe_exec_queue.c
index 2179c65dc60ab..c031334a6d2a2 100644
--- a/drivers/gpu/drm/xe/xe_exec_queue.c
+++ b/drivers/gpu/drm/xe/xe_exec_queue.c
@@ -627,12 +627,14 @@ int xe_exec_queue_create_ioctl(struct drm_device *dev, void *data,
}
}
+ q->xef = xe_file_get(xef);
+
+ /* user id alloc must always be last in ioctl to prevent UAF */
err = xa_alloc(&xef->exec_queue.xa, &id, q, xa_limit_32b, GFP_KERNEL);
if (err)
goto kill_exec_queue;
args->exec_queue_id = id;
- q->xef = xe_file_get(xef);
return 0;
--
2.47.0
