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From: Borislav Petkov <bp@alien8.de>
To: Andrew Lutomirski <luto@mit.edu>
Cc: Ingo Molnar <mingo@elte.hu>, "H. Peter Anvin" <hpa@zytor.com>,
	Andi Kleen <andi@firstfloor.org>,
	x86@kernel.org, linux-kernel@vger.kernel.org,
	torvalds@linux-foundation.org, lueckintel@yahoo.com,
	kimwooyoung@gmail.com, Suresh Siddha <suresh.b.siddha@intel.com>
Subject: Re: [RFC v2] x86-64: Allow emulated vsyscalls from user addresses
Date: Sun, 7 Aug 2011 17:44:56 +0200	[thread overview]
Message-ID: <20110807154456.GA695@liondog.tnic> (raw)
In-Reply-To: <CAObL_7Et-CcamO+X4D5tvH3oWh9=Zog0t=MzOnyqNPzmGqmm2A@mail.gmail.com>

On Sun, Aug 07, 2011 at 08:58:56AM -0400, Andrew Lutomirski wrote:
> > Also, what do we do with userspace which decides to hardcode "int 0x4[012]"
> > somewhere in the meantime?
> 
> Break it?  Any code that does that will get an unconditional warning
> with this patch.

Ok, I hope you're right. Because I'm sure you remember the last
prominent time the kernel broke userspace in the face of powertop.
Although having the warning should be fine, i.e. along the lines of "you
silly userspace process have been warned."

Thanks.

-- 
Regards/Gruss,
    Boris.

  reply	other threads:[~2011-08-07 15:45 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-05 20:09 New vsyscall emulation breaks JITs 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 [this message]
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
     [not found]                             ` <1312934493.45753.YahooMailNeo@web120015.mail.ne1.yahoo.com>
2011-08-10  1:49                               ` H. Peter Anvin

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