From: Mikael Pettersson <mikpe@it.uu.se>
To: Ingo Molnar <mingo@elte.hu>
Cc: Andrew Lutomirski <luto@mit.edu>,
Thomas Gleixner <tglx@linutronix.de>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
x86@kernel.org, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [GIT pull] x86 vdso updates
Date: Sun, 29 May 2011 16:39:47 +0200 [thread overview]
Message-ID: <19938.23219.306163.24059@pilspetsen.it.uu.se> (raw)
In-Reply-To: <20110528153536.GB27104@elte.hu>
Ingo Molnar writes:
>
> * Andrew Lutomirski <luto@mit.edu> wrote:
>
> > On Fri, May 27, 2011 at 7:36 AM, Andrew Lutomirski <luto@mit.edu> wrote:
> > > 3. Add int 0xcc and use it from vgettimeofday. It will SIGSEGV if
> > > called from a user address (so it has no risk of ever becoming ABI)
> > > and it will do gettimeofday if called from the right address. (I like
...
> > Make it a real syscall but with extra constraints. It would have the
> > same calling convention as the syscall instruction, but it would turn
> > into SIGKILL if the calling address isn't in the VSYSCALL page
This will make things difficult for user-space dynamic binary instrumentation
applications, since these normally execute generated code at different
addresses than the original code.
Is there a safe fallback for this particular vsyscall?
/Mikael
next prev parent reply other threads:[~2011-05-29 14:39 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-26 18:50 Thomas Gleixner
2011-05-26 21:26 ` Andy Lutomirski
2011-05-27 6:12 ` Ingo Molnar
2011-05-27 11:36 ` Andrew Lutomirski
2011-05-27 11:59 ` richard -rw- weinberger
2011-05-27 12:10 ` Andrew Lutomirski
2011-05-27 14:59 ` richard -rw- weinberger
2011-05-27 15:05 ` Andrew Lutomirski
2011-05-29 9:51 ` richard -rw- weinberger
2011-05-29 14:57 ` Andrew Lutomirski
2011-05-29 15:10 ` richard -rw- weinberger
2011-05-29 15:28 ` Andrew Lutomirski
2011-05-29 16:40 ` richard -rw- weinberger
2011-05-27 14:54 ` Andrew Lutomirski
2011-05-28 15:35 ` Ingo Molnar
2011-05-29 1:41 ` Andrew Lutomirski
2011-05-29 14:39 ` Mikael Pettersson [this message]
2011-05-29 14:59 ` Andrew Lutomirski
2011-05-29 16:01 ` Mikael Pettersson
2011-05-29 16:35 ` Andrew Lutomirski
2011-05-29 18:06 ` Mikael Pettersson
2011-05-29 18:44 ` Andrew Lutomirski
2011-05-30 3:26 ` Andrew Lutomirski
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