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

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Date:   Sun, 10 Mar 2019 14:52:02 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Tejun Heo <tj@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexey Dobriyan <adobriyan@...il.com>
Subject: Re: [PATCH v1 2/6] lib: scanf: handle integer overflows in vsscanf

On Sun, Mar 10, 2019 at 2:06 PM Rasmus Villemoes
<linux@...musvillemoes.dk> 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