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Message-ID: <19938.23219.306163.24059@pilspetsen.it.uu.se> Date: Sun, 29 May 2011 16:39:47 +0200 From: Mikael Pettersson <mikpe@...uu.se> To: Ingo Molnar <mingo@...e.hu> Cc: Andrew Lutomirski <luto@....edu>, Thomas Gleixner <tglx@...utronix.de>, Linus Torvalds <torvalds@...ux-foundation.org>, Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org, LKML <linux-kernel@...r.kernel.org> Subject: Re: [GIT pull] x86 vdso updates Ingo Molnar writes: > > * Andrew Lutomirski <luto@....edu> wrote: > > > On Fri, May 27, 2011 at 7:36 AM, Andrew Lutomirski <luto@....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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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