From: Andi Kleen <andi@firstfloor.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andi Kleen <andi@firstfloor.org>,
luto@mit.edu, x86@kernel.org, linux-kernel@vger.kernel.org,
torvalds@linux-foundation.org, lueckintel@yahoo.com,
kimwooyoung@gmail.com
Subject: Re: New vsyscall emulation breaks JITs
Date: Fri, 5 Aug 2011 22:26:56 +0200 [thread overview]
Message-ID: <20110805202656.GI5782@one.firstfloor.org> (raw)
In-Reply-To: <4E3C5154.2050307@zytor.com>
> I have to say I believe that trying to JIT the vdso or vsyscall pages is
> extremely dubious at best. They are fundamentally different from normal
> user space in that the kernel can muck with them any time, without
> notifying userspace about it. The other aspect of this is that this is
> about the legacy vsyscall page, which we're trying to get rid of, partly
> because of security problems.
There's clear evidence now you can't: it's used even by new binaries.
-Andi
next prev parent reply other threads:[~2011-08-05 20:27 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 [this message]
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
[not found] ` <1312934493.45753.YahooMailNeo@web120015.mail.ne1.yahoo.com>
2011-08-10 1:49 ` H. Peter Anvin
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