linux-kernel - Re: New vsyscall emulation breaks JITs

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Message-ID: <20110805202656.GI5782@one.firstfloor.org>
Date:	Fri, 5 Aug 2011 22:26:56 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andi Kleen <andi@...stfloor.org>, luto@....edu, x86@...nel.org,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	lueckintel@...oo.com, kimwooyoung@...il.com
Subject: Re: New vsyscall emulation breaks JITs

> 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

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