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From: Ingo Molnar <mingo@elte.hu>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: mingo@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org,
	brgerst@gmail.com, jolsa@redhat.com, stable@kernel.org,
	tglx@linutronix.de, linux-tip-commits@vger.kernel.org
Subject: Re: [tip:perf/core] x86, 64-bit: Fix copy_[to/from]_user() checks for the userspace address limit
Date: Wed, 18 May 2011 22:59:52 +0200	[thread overview]
Message-ID: <20110518205952.GA25923@elte.hu> (raw)
In-Reply-To: <BANLkTimoHTmSa4LwpN-FLiEwWVLfBetV8g@mail.gmail.com>


* Linus Torvalds <torvalds@linux-foundation.org> wrote:

> On Wed, May 18, 2011 at 1:43 PM, tip-bot for Jiri Olsa <jolsa@redhat.com> wrote:
> > As reported in BZ #30352:
> >
> >  https://bugzilla.kernel.org/show_bug.cgi?id=30352
> >
> > there's a kernel bug related to reading the last allowed page on x86_64.
> 
> Btw, I think this message is very misleading.
> 
> It has nothing what-so-ever to do with "the last allowed page".

Yeah, i noticed that and this is why i added this bit from Brian's explanation 
to the end of the commit:

    The bug is that the last byte before the guard page can't be read
    because of the off-by-one error. The guard page is left in place.

I should have fixed the original changelog instead of trying to clarify it via 
appending it ...

Thanks,

	Ingo

      reply	other threads:[~2011-05-18 21:00 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-05-12 14:30 [PATCH] x86, x86_64: Fix checks for " Jiri Olsa
2011-05-16 11:42 ` Ingo Molnar
2011-05-18  4:48   ` Brian Gerst
2011-05-18  8:12     ` Ingo Molnar
2011-05-18 10:08   ` Linus Torvalds
2011-05-18 10:39     ` Ingo Molnar
2011-05-18 20:43 ` [tip:perf/core] x86, 64-bit: Fix copy_[to/from]_user() checks for the " tip-bot for Jiri Olsa
2011-05-18 20:54   ` Linus Torvalds
2011-05-18 20:59     ` Ingo Molnar [this message]

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