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Date: Tue, 16 Sep 2014 22:34:18 -0700 From: Andy Lutomirski <luto@...capital.net> To: Richard Larocque <rlarocque@...gle.com> Cc: Ingo Molnar <mingo@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, "H. Peter Anvin" <hpa@...or.com>, Filipe Brandenburger <filbranden@...gle.com>, Michael Davidson <md@...gle.com>, Greg Thelen <gthelen@...gle.com>, X86 ML <x86@...nel.org>, Linux API <linux-api@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] x86/vdso: Add prctl to set per-process VDSO load On Tue, Sep 16, 2014 at 10:00 PM, Andy Lutomirski <luto@...capital.net> wrote: > On Tue, Sep 16, 2014 at 6:18 PM, Richard Larocque <rlarocque@...gle.com> wrote: >> On Tue, Sep 16, 2014 at 5:27 PM, Andy Lutomirski <luto@...capital.net> wrote: > I think that the patch should instead tweak the vvar mapping to tell > the vdso not to use rdtsc. It should be based on this: > > https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git/log/?h=x86/vsyscall > > and I'll talk to hpa tomorrow about about getting that, or something > like it, into the tip tree. In particular, you'll need this: > > https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git/commit/?h=x86/vsyscall&id=0cc410a05cb95e073ebfe099c9e03cef48d2be0f Crud. Now that I've said that, I realize that this won't work right if rdtscp is off. I'll drop that patch. I don't think that this changes the conclusion. It should be possible to swap out the vvar page to keep the vdso working even without rdtsc available. --Andy > > Also, this kind of inheritable restriction may end up requiring > no_new_privs or CAP_SYS_ADMIN to be secure. > > --Andy -- Andy Lutomirski AMA Capital Management, LLC -- 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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