Re: [PATCH v2] rseq: fix using an uninitialized stack variable in rseq_exit_user_update

[Peter Zijlstra]

On Tue, Jun 02, 2026 at 11:08:54AM +0800, Qing Wang wrote:
> There is an bug which is an uninitialized stack variable use in
> `rseq_exit_user_update()` reported by syzbot:
> 
> BUG: KMSAN: kernel-infoleak in rseq_set_ids_get_csaddr include/linux/rseq_entry.h:502 [inline]
> 
> The local variable:
> ```c
> 	struct rseq_ids ids = {
> 		.cpu_id	 = task_cpu(t),
> 		.mm_cid	 = task_mm_cid(t),
> 		.node_id = cpu_to_node(ids.cpu_id),
> 	};
> ```

FWIW, I've no idea what that ``` nonsense is, but it does not belong in
Changelogs. I've removed it.