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Re: [PATCH] x86/refcount: Implement fast refcount_t handling

From Kees Cook <keescook@chromium.org>
Newsgroups linux.kernel
Subject Re: [PATCH] x86/refcount: Implement fast refcount_t handling
Date 2017-04-24 22:30 +0200
Message-ID <tzSMq-3ex-35@gated-at.bofh.it> (permalink)
References <tyOUy-2RV-13@gated-at.bofh.it> <tzJSO-5YI-19@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Mon, Apr 24, 2017 at 3:48 AM, Peter Zijlstra <peterz@infradead.org> wrote:
> On Fri, Apr 21, 2017 at 03:09:39PM -0700, Kees Cook wrote:
>> diff --git a/drivers/misc/lkdtm_bugs.c b/drivers/misc/lkdtm_bugs.c
>> index e3f4cd8876b5..1bdafb29b802 100644
>> --- a/drivers/misc/lkdtm_bugs.c
>> +++ b/drivers/misc/lkdtm_bugs.c
>> @@ -135,9 +135,15 @@ void lkdtm_HUNG_TASK(void)
>>       schedule();
>>  }
>>
>> +#ifdef CONFIG_FAST_REFCOUNT
>> +#define REFCOUNT_MAX INT_MAX
>> +#else
>> +#define REFCOUNT_MAX UINT_MAX
>> +#endif
>
> That doesn't seem like a sensible place for this.

I'll drop the LKDTM changes from this particular patch. As for the
define, I think it's only interesting to LKDTM since it's the only
part interested in refcount_t internals. (i.e. nothing else would (or
should) use this information.)

-Kees

-- 
Kees Cook
Pixel Security

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Thread

[PATCH] x86/refcount: Implement fast refcount_t handling Kees Cook <keescook@chromium.org> - 2017-04-22 00:10 +0200
  Re: [PATCH] x86/refcount: Implement fast refcount_t handling Peter Zijlstra <peterz@infradead.org> - 2017-04-24 10:40 +0200
    Re: [kernel-hardening] Re: [PATCH] x86/refcount: Implement fast  refcount_t handling Jann Horn <jannh@google.com> - 2017-04-24 11:00 +0200
      Re: [kernel-hardening] Re: [PATCH] x86/refcount: Implement fast  refcount_t handling Peter Zijlstra <peterz@infradead.org> - 2017-04-24 11:30 +0200
    Re: [PATCH] x86/refcount: Implement fast refcount_t handling "PaX Team" <pageexec@freemail.hu> - 2017-04-24 13:10 +0200
      Re: [PATCH] x86/refcount: Implement fast refcount_t handling Peter Zijlstra <peterz@infradead.org> - 2017-04-24 13:20 +0200
        Re: [PATCH] x86/refcount: Implement fast refcount_t handling "PaX Team" <pageexec@freemail.hu> - 2017-04-24 15:20 +0200
          Re: [PATCH] x86/refcount: Implement fast refcount_t handling Peter Zijlstra <peterz@infradead.org> - 2017-04-24 15:40 +0200
            Re: [PATCH] x86/refcount: Implement fast refcount_t handling "PaX Team" <pageexec@freemail.hu> - 2017-04-24 17:20 +0200
              Re: [PATCH] x86/refcount: Implement fast refcount_t handling Kees Cook <keescook@chromium.org> - 2017-04-24 22:50 +0200
                Re: [PATCH] x86/refcount: Implement fast refcount_t handling Peter Zijlstra <peterz@infradead.org> - 2017-04-25 00:10 +0200
                Re: [PATCH] x86/refcount: Implement fast refcount_t handling Kees Cook <keescook@chromium.org> - 2017-04-25 00:40 +0200
                Re: [kernel-hardening] Re: [PATCH] x86/refcount: Implement fast  refcount_t handling Rik van Riel <riel@redhat.com> - 2017-04-25 03:20 +0200
                Re: [PATCH] x86/refcount: Implement fast refcount_t handling Peter Zijlstra <peterz@infradead.org> - 2017-04-25 11:10 +0200
                Re: [PATCH] x86/refcount: Implement fast refcount_t handling "PaX Team" <pageexec@freemail.hu> - 2017-04-25 13:30 +0200
                Re: [PATCH] x86/refcount: Implement fast refcount_t handling Kees Cook <keescook@chromium.org> - 2017-04-25 18:40 +0200
      Re: [PATCH] x86/refcount: Implement fast refcount_t handling Kees Cook <keescook@chromium.org> - 2017-04-24 22:40 +0200
        Re: [PATCH] x86/refcount: Implement fast refcount_t handling "PaX Team" <pageexec@freemail.hu> - 2017-04-25 13:30 +0200
          Re: [PATCH] x86/refcount: Implement fast refcount_t handling Kees Cook <keescook@chromium.org> - 2017-04-25 18:50 +0200
            Re: [PATCH] x86/refcount: Implement fast refcount_t handling "PaX Team" <pageexec@freemail.hu> - 2017-04-26 04:20 +0200
              Re: [PATCH] x86/refcount: Implement fast refcount_t handling Kees Cook <keescook@chromium.org> - 2017-04-26 06:50 +0200
    Re: [PATCH] x86/refcount: Implement fast refcount_t handling Kees Cook <keescook@chromium.org> - 2017-04-24 22:20 +0200
  Re: [PATCH] x86/refcount: Implement fast refcount_t handling Peter Zijlstra <peterz@infradead.org> - 2017-04-24 12:50 +0200
    Re: [PATCH] x86/refcount: Implement fast refcount_t handling Kees Cook <keescook@chromium.org> - 2017-04-24 22:20 +0200
  Re: [PATCH] x86/refcount: Implement fast refcount_t handling Peter Zijlstra <peterz@infradead.org> - 2017-04-24 13:00 +0200
    Re: [PATCH] x86/refcount: Implement fast refcount_t handling Kees Cook <keescook@chromium.org> - 2017-04-24 22:30 +0200
  Re: [PATCH] x86/refcount: Implement fast refcount_t handling Peter Zijlstra <peterz@infradead.org> - 2017-04-25 12:30 +0200
    Re: [PATCH] x86/refcount: Implement fast refcount_t handling "PaX Team" <pageexec@freemail.hu> - 2017-04-25 13:30 +0200

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