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 10:48:32 -0700 [thread overview]
Message-ID: <531DFAF0.9070806@linux.intel.com> (raw)
In-Reply-To: <CALCETrVKfBpVHZcyccWRYM4rdOAETSQsxjiQuxn+0AeX78XiEw@mail.gmail.com>
On 03/10/2014 10:46 AM, Andy Lutomirski wrote:
>>
>> Yes, we'd have to switch the vdso to using syscall access. Doing that
>> from inside a system call is... "interesting".
>
> It's a little less interesting if it just involves changing a vma.
> It's still tricky, though -- would each struct mm have its own struct
> file for the vvar page? Can this be done with some
> vm_operations_struct magic? There are possible races, too, though --
> another thread could access the thing concurrently with a syscall.
>
Hint: where is your RIP? Where is the RIP of other processes?
-hpa
next prev parent reply other threads:[~2014-03-10 17:48 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 [this message]
2014-03-10 17:52 ` Andy Lutomirski
2014-03-10 17:58 ` H. Peter Anvin
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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