Re: [PATCH] kasan: avoid overflowing quarantine size on low memory systems

From	Alexander Potapenko <glider@google.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] kasan: avoid overflowing quarantine size on low memory systems
Date	2016-08-02 12:30 +0200
Message-ID	<s1F7r-36W-19@gated-at.bofh.it> (permalink)
References	<s1n0R-7W5-1@gated-at.bofh.it> <s1EO6-30z-7@gated-at.bofh.it> <s1EO6-30z-5@gated-at.bofh.it> <s1EO6-30z-33@gated-at.bofh.it> <s1F7r-36W-21@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Tue, Aug 2, 2016 at 12:23 PM, Andrey Ryabinin
<aryabinin@virtuozzo.com> wrote:
>
>
> On 08/02/2016 01:07 PM, Alexander Potapenko wrote:
>> On Tue, Aug 2, 2016 at 12:05 PM, Dmitry Vyukov <dvyukov@google.com> wrote:
>>> On Tue, Aug 2, 2016 at 12:00 PM, Andrey Ryabinin
>>>>
>>>> Why WARN? I'd suggest pr_warn_once();
>>>
>>>
>>> I would suggest to just do something useful. Setting quarantine
>>> new_quarantine_size to 0 looks fine.
>>> What would user do with this warning? Number of CPUs and amount of
>>> memory are generally fixed. Why is it an issue for end user at all? We
>>> still have some quarantine per-cpu. A WARNING means a [non-critical]
>>> kernel bug. E.g. syzkaller will catch each and every boot of such
>>> system as a bug.
>> How about printk_once then?
>> Silently setting the quarantine size to zero may puzzle the user.
>>
>
> Nope, user will not notice anything. So keeping it silent would be better.
> Plus it's very unlikely that this will ever happen in real life.
>
Ok, I've sent out v2, please take a look.


-- 
Alexander Potapenko
Software Engineer

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Thread

[PATCH] kasan: avoid overflowing quarantine size on low memory systems Alexander Potapenko <glider@google.com> - 2016-08-01 17:10 +0200
  Re: [PATCH] kasan: avoid overflowing quarantine size on low memory  systems Andrew Morton <akpm@linux-foundation.org> - 2016-08-01 22:50 +0200
  Re: [PATCH] kasan: avoid overflowing quarantine size on low memory systems Dmitry Vyukov <dvyukov@google.com> - 2016-08-02 12:10 +0200
    Re: [PATCH] kasan: avoid overflowing quarantine size on low memory systems Alexander Potapenko <glider@google.com> - 2016-08-02 12:10 +0200
      Re: [PATCH] kasan: avoid overflowing quarantine size on low memory systems Alexander Potapenko <glider@google.com> - 2016-08-02 12:30 +0200
      Re: [PATCH] kasan: avoid overflowing quarantine size on low memory systems Dmitry Vyukov <dvyukov@google.com> - 2016-08-02 12:30 +0200
  Re: [PATCH] kasan: avoid overflowing quarantine size on low memory systems Alexander Potapenko <glider@google.com> - 2016-08-02 12:10 +0200

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