From: "H. Peter Anvin" <hpa@linux.intel.com>
To: Andy Lutomirski <luto@amacapital.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Stefani Seibold <stefani@seibold.net>,
Andreas Brief <Andreas.Brief@rohde-schwarz.com>,
Martin Runge <Martin.Runge@rohde-schwarz.com>
Subject: Re: [x86, vdso] BUG: unable to handle kernel paging request at d34bd000
Date: Mon, 10 Mar 2014 10:58:45 -0700 [thread overview]
Message-ID: <531DFD55.1070000@linux.intel.com> (raw)
In-Reply-To: <CALCETrVkTtt5H9-0_mODcGyaLTusBfANkoANo+wKB4JAwjxU2g@mail.gmail.com>
On 03/10/2014 10:52 AM, Andy Lutomirski wrote:
>>
>> Hint: where is your RIP? Where is the RIP of other processes?
>>
>
> Whoa there, I'm not suggesting anything nearly that crazy :)
>
> I'm suggesting changing out the vvar page *for that process*, which is
> not executable. The actual vdso code already supports this -- from
> userspace's point of view it's the same thing as 'echo acpi_pm >
> /sys/devices/system/clocksource/clocksource0/current_clocksource',
> except that if the actual clocksource is HPET, the hpet page will be
> switched out (presumably with a zero page) while being read.
>
> Other processes are totally irrelevant, unless they share the same
> struct mm. (This is why the vvar page can't be in the fixmap for this
> to work.)
>
I meant "threads" not "processes"...
-hpa
next prev parent reply other threads:[~2014-03-10 17:58 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-07 1:38 [x86, vdso] BUG: unable to handle kernel paging request at d34bd000 Fengguang Wu
2014-03-07 1:48 ` [x86, vdso] BUG: unable to handle kernel paging request at 91c24000 Fengguang Wu
2014-03-07 7:21 ` [x86, vdso] BUG: unable to handle kernel paging request at d34bd000 Stefani Seibold
2014-03-07 18:56 ` Andy Lutomirski
2014-03-07 21:53 ` Stefani Seibold
2014-03-07 23:07 ` Andy Lutomirski
2014-03-09 8:47 ` Stefani Seibold
2014-03-10 0:16 ` H. Peter Anvin
2014-03-10 3:18 ` Andy Lutomirski
2014-03-10 4:46 ` Andy Lutomirski
2014-03-10 14:59 ` H. Peter Anvin
[not found] ` <CA+55aFwKpBybz9S9A=+tcr1BbdzAbagL30Br2cak2GrdPH=hhA@mail.gmail.com>
2014-03-10 17:12 ` Andy Lutomirski
2014-03-10 17:24 ` H. Peter Anvin
2014-03-10 17:31 ` Andy Lutomirski
2014-03-10 17:38 ` H. Peter Anvin
2014-03-10 17:46 ` Andy Lutomirski
2014-03-10 17:48 ` H. Peter Anvin
2014-03-10 17:52 ` Andy Lutomirski
2014-03-10 17:58 ` H. Peter Anvin [this message]
2014-03-10 18:10 ` Andy Lutomirski
2014-03-10 17:49 ` H. Peter Anvin
2014-03-10 20:03 ` Stefani Seibold
2014-03-10 20:06 ` H. Peter Anvin
2014-03-10 20:19 ` Linus Torvalds
2014-03-10 21:20 ` Linus Torvalds
2014-03-10 21:43 ` Andy Lutomirski
2014-03-10 21:51 ` Dave Jones
2014-03-10 22:59 ` H. Peter Anvin
2014-03-10 23:32 ` [PATCH] x86: Remove CONFIG_X86_OOSTORE Dave Jones
2014-03-11 10:11 ` [x86, vdso] BUG: unable to handle kernel paging request at d34bd000 Ingo Molnar
2014-03-10 21:25 ` stefani
2014-03-10 21:39 ` Linus Torvalds
2014-03-10 21:53 ` stefani
2014-03-10 22:03 ` Andy Lutomirski
2014-03-10 22:36 ` Andy Lutomirski
2014-03-10 23:02 ` H. Peter Anvin
2014-03-10 21:29 ` stefani
2014-03-11 6:02 ` H. Peter Anvin
2014-03-07 8:47 ` Stefani Seibold
2014-03-07 9:15 ` Fengguang Wu
2014-03-07 9:57 ` Stefani Seibold
2014-03-07 10:21 ` Fengguang Wu
2014-03-07 16:06 ` Stefani Seibold
2014-03-07 23:12 ` H. Peter Anvin
2014-03-07 10:36 ` Fengguang Wu
2014-03-07 23:44 ` Fengguang Wu
2014-03-09 8:08 ` Stefani Seibold
2014-03-10 0:00 ` H. Peter Anvin
2014-03-10 19:41 ` Greg Kroah-Hartman
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