Re: [PATCH v2 0/2] kallsyms: handle special absolute symbols
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- To: Kees Cook <keescook@xxxxxxxxxxxx>
- Subject: Re: [PATCH v2 0/2] kallsyms: handle special absolute symbols
- From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
- Date: Mon, 10 Mar 2014 13:02:24 -0700
- Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Andrew Honig <ahonig@xxxxxxxxxx>, Michal Marek <mmarek@xxxxxxx>, "x86@xxxxxxxxxx" <x86@xxxxxxxxxx>, Tejun Heo <tj@xxxxxxxxxx>, Tony Luck <tony.luck@xxxxxxxxx>, Fenghua Yu <fenghua.yu@xxxxxxxxx>, linux-ia64@xxxxxxxxxxxxxxx, LKML <linux-kernel@xxxxxxxxxxxxxxx>
- In-reply-to: <CAGXu5j+9Qt2p+dqdqcecMQ4RRb8tBVMqMDBdRGFjiRQHmDaatQ@mail.gmail.com>
- List-id: <linux-ia64.vger.kernel.org>
- References: <1394240425-11647-1-git-send-email-keescook@chromium.org> <20140310120657.80aa5569714e5b53c6662798@linux-foundation.org> <CAGXu5j+9Qt2p+dqdqcecMQ4RRb8tBVMqMDBdRGFjiRQHmDaatQ@mail.gmail.com>
On Mon, 10 Mar 2014 12:58:06 -0700 Kees Cook <keescook@xxxxxxxxxxxx> wrote:
> On Mon, Mar 10, 2014 at 12:06 PM, Andrew Morton
> <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
> > On Fri, 7 Mar 2014 17:00:23 -0800 Kees Cook <keescook@xxxxxxxxxxxx> wrote:
> >> Handles 0-based per_cpu variables as being absolute so they are
> >> not relocated under kASLR on x86_64.
> >
> > Would it be prudent to revert 0f55159d091cb1e5 ("kallsyms: fix absolute
> > addresses for kASLR") then sort all this out for 3.15?
>
> My opinion is that if it breaks a real-life case (avr32), it should be
> reverted.
We aren't going to be able to test this on 40 architectures so yes,
let's take the cautious approach.
> The only people affected by the kallsyms per_cpu relocation
> reporting bug are those using kASLR on x86, and even then the bug is a
> corner case on live kernel debugging.
>
> I am fine either way.
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