Re: [PATCH] exec: Make sure task->comm is always NUL-terminated

[Jens Axboe <axboe@kernel.dk>]

On 11/29/24 9:49 PM, Kees Cook wrote:
> Using strscpy() meant that the final character in task->comm may be
> non-NUL for a moment before the "string too long" truncation happens.
> 
> Instead of adding a new use of the ambiguous strncpy(), we'd want to
> use memtostr_pad() which enforces being able to check at compile time
> that sizes are sensible, but this requires being able to see string
> buffer lengths. Instead of trying to inline __set_task_comm() (which
> needs to call trace and perf functions), just open-code it. But to
> make sure we're always safe, add compile-time checking like we already
> do for get_task_comm().

In terms of the io_uring changes, both of those looks fine to me. Feel
free to bundle it with something else. If you're still changing things,
then I do prefer = { }; rather than no space...

-- 
Jens Axboe