Re: [PATCH v1 2/6] lib: scanf: handle integer overflows in vsscanf

[Linus Torvalds]

On Sun, Mar 10, 2019 at 2:06 PM Rasmus Villemoes
<linux@xxxxxxxxxxxxxxxxxx> wrote:
>
> IIRC, this has been attempted before, causing a userspace regression
> because some sysfs/procfs file matched with %u or %x, and somebody wrote
> -1 to get 0xffffffff .

.. which is correct anyway. That's how scanf is supposed to work.

If somebody needs overflow checking, they shouldn't be using scanf.

                  Linus