From: Ingo Molnar <mingo@kernel.org>
To: Kees Cook <keescook@chromium.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
LKML <linux-kernel@vger.kernel.org>,
Michael Davidson <md@google.com>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@linux.intel.com>,
"linux-tip-commits@vger.kernel.org"
<linux-tip-commits@vger.kernel.org>
Subject: Re: [tip:x86/kaslr] x86, relocs: Add more per-cpu gold special cases
Date: Tue, 15 Oct 2013 08:04:25 +0200 [thread overview]
Message-ID: <20131015060425.GB3866@gmail.com> (raw)
In-Reply-To: <CAGXu5j+tQfUpmem85WK5-ootoJM1mCH6BPDr3pfR2sHwoFy_8A@mail.gmail.com>
* Kees Cook <keescook@chromium.org> wrote:
> On Mon, Oct 14, 2013 at 9:28 AM, H. Peter Anvin <hpa@zytor.com> wrote:
> > On 10/14/2013 07:19 AM, H. Peter Anvin wrote:
> >> My guess is that the 95 addresses are randomized and the 82 address is an address which failed to relocate.
> >
> >> ffffffff82a04a58 is:
> >> ffffffff82a03000 t init_per_cpu__gdt_page
> >
> >
> > Specifically, it looks like the percpu stuff isn't getting set up correctly.
>
> It wouldn't surprise me if there are even more percpu things to fix.
> It's the main area we've continued to trip over while working on this
> with various linkers. Which linker and version are you seeing this
> with?
The failure I saw triggered with fairly modern userspace:
GNU ld version 2.23.52.0.1-9.fc19 20130226
gcc version 4.8.1 20130603 (Red Hat 4.8.1-1) (GCC)
Thanks,
Ingo
next prev parent reply other threads:[~2013-10-15 6:04 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-11 1:39 [PATCH v2] x86, relocs: add more per-cpu gold special cases Kees Cook
2013-10-13 12:01 ` [tip:x86/kaslr] x86, relocs: Add " tip-bot for Michael Davidson
2013-10-14 8:30 ` Ingo Molnar
2013-10-14 9:38 ` Ingo Molnar
2013-10-14 14:19 ` H. Peter Anvin
2013-10-14 16:28 ` H. Peter Anvin
2013-10-14 20:47 ` Kees Cook
2013-10-15 6:04 ` Ingo Molnar [this message]
2013-10-15 15:42 ` Kees Cook
2013-10-15 16:03 ` Ingo Molnar
2013-10-15 17:22 ` Kees Cook
2013-10-16 6:56 ` Ingo Molnar
2013-10-16 14:53 ` Kees Cook
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