From: "H. Peter Anvin" <hpa@zytor.com>
To: Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Lutomirski <luto@mit.edu>
Cc: Greg Lueck <lueckintel@yahoo.com>,
Andi Kleen <andi@firstfloor.org>,
"x86@kernel.org" <x86@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"kimwooyoung@gmail.com" <kimwooyoung@gmail.com>
Subject: Re: New vsyscall emulation breaks JITs
Date: Tue, 09 Aug 2011 19:56:47 -0500 [thread overview]
Message-ID: <e4ce8567-22f5-4906-8dce-418e1afd60ff@email.android.com> (raw)
In-Reply-To: <CA+55aFyV65BNjdsmS9oTaRwWzyJZS3BDEDJBx5Poy-vGp5iN_Q@mail.gmail.com>
Linus Torvalds <torvalds@linux-foundation.org> wrote:
>On Tue, Aug 9, 2011 at 2:04 PM, Andrew Lutomirski <luto@mit.edu> wrote:
>>
>> Here's a different proposal, then:
>>
>> What if the kernel had the sequence:
>>
>> mov $__NR_whatever,%eax
>> syscall
>> ret
>>
>> in the vsyscall page but marked the vsyscall page NX.
>
>This sounds like a sound idea. And then the difference between "fast
>and native" and "slow and trapping" ends up literally being just the
>NX bit.
>
> Linus
Very promising idea indeed.
--
Sent from my mobile phone. Please excuse my brevity and lack of formatting.
next prev parent reply other threads:[~2011-08-10 0:57 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-05 20:09 Andi Kleen
2011-08-05 20:23 ` H. Peter Anvin
2011-08-05 20:26 ` Andi Kleen
2011-08-05 20:36 ` H. Peter Anvin
2011-08-05 20:47 ` Andi Kleen
2011-08-05 20:45 ` Andrew Lutomirski
2011-08-05 20:48 ` H. Peter Anvin
2011-08-05 20:52 ` Andi Kleen
2011-08-05 21:00 ` Andrew Lutomirski
2011-08-05 21:21 ` Andi Kleen
2011-08-05 21:26 ` Andrew Lutomirski
2011-08-05 22:06 ` H. Peter Anvin
2011-08-05 22:11 ` Andrew Lutomirski
2011-08-06 0:20 ` Andrew Lutomirski
2011-08-06 0:32 ` H. Peter Anvin
2011-08-06 3:01 ` [RFC] x86-64: Allow emulated vsyscalls from user addresses Andy Lutomirski
2011-08-06 3:04 ` [RFC v2] " Andy Lutomirski
2011-08-06 6:45 ` Ingo Molnar
2011-08-07 12:19 ` Borislav Petkov
2011-08-07 12:58 ` Andrew Lutomirski
2011-08-07 15:44 ` Borislav Petkov
2011-08-07 16:14 ` Andrew Lutomirski
2011-08-11 13:16 ` Pavel Machek
2011-08-11 13:27 ` Andrew Lutomirski
2011-08-09 22:27 ` New vsyscall emulation breaks JITs Suresh Siddha
2011-08-09 13:26 ` Andrew Lutomirski
2011-08-09 15:04 ` Andi Kleen
2011-08-09 15:22 ` Andrew Lutomirski
2011-08-09 16:47 ` [RFC] x86-64: Add vsyscall=emulate|native|none option Andy Lutomirski
2011-08-09 19:54 ` Linus Torvalds
2011-08-09 16:57 ` New vsyscall emulation breaks JITs H. Peter Anvin
2011-08-09 17:05 ` Andrew Lutomirski
[not found] ` <1312919938.17118.YahooMailNeo@web120010.mail.ne1.yahoo.com>
2011-08-09 20:59 ` H. Peter Anvin
2011-08-09 21:04 ` Andrew Lutomirski
2011-08-09 22:36 ` Linus Torvalds
2011-08-10 0:56 ` H. Peter Anvin [this message]
[not found] ` <1312934493.45753.YahooMailNeo@web120015.mail.ne1.yahoo.com>
2011-08-10 1:49 ` H. Peter Anvin
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