linux-kernel - Re: [PATCH v2] efivarfs: Limit the rate for non-root to read files

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Message-ID: <CA+55aFyOLYAbvTX0F8WLHgBnhwAPWr7EOPbO_sEepmB5GsCBKQ@mail.gmail.com>
Date:   Thu, 22 Feb 2018 09:39:10 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     "Luck, Tony" <tony.luck@...el.com>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Joe Konno <joe.konno@...ux.intel.com>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jeremy Kerr <jk@...abs.org>,
        Matthew Garrett <mjg59@...gle.com>,
        Peter Jones <pjones@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        James Bottomley <james.bottomley@...senpartnership.com>
Subject: Re: [PATCH v2] efivarfs: Limit the rate for non-root to read files

On Thu, Feb 22, 2018 at 9:15 AM, Luck, Tony <tony.luck@...el.com> wrote:
>
> In efivarfs if the limit is exceeded when reading, we take an
> interruptible nap for 50ms and check the rate limit again.

Ok, turning that 'if' into a 'while' makes the sleeping work even in
the presence of lots of threads, and that all looks very simple.

I'm certainly ok with this. I'm assuming this has been tested and
gives nice warnings too?

               Linus