From: Peter Zijlstra <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
To: Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>
Cc: "linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Ingo Molnar <mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Kees Cook <keescook-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>,
Andrea Arcangeli
<aarcange-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Erik Bosman <ebn310-vHs5IaWfoDhmR6Xm/wNWPw@public.gmane.org>,
"H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>,
Linux API <linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Michael Kerrisk-manpages
<mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Paul Mackerras <paulus-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>,
Arnaldo Carvalho de Melo
<acme-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
X86 ML <x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Subject: Re: [PATCH] x86,seccomp,prctl: Remove PR_TSC_SIGSEGV and seccomp TSC filtering
Date: Fri, 3 Oct 2014 23:12:04 +0200 [thread overview]
Message-ID: <20141003211204.GQ10583@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <CALCETrW7OCuAiK31iRvXgXJfcf3FE4GKjpKQ0doWFyUpETzT9A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
On Fri, Oct 03, 2014 at 02:04:53PM -0700, Andy Lutomirski wrote:
> On Fri, Oct 3, 2014 at 2:02 PM, Peter Zijlstra <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org> wrote:
> > Something like so.. slightly less ugly and possibly with more
> > complicated conditions setting the cr4 if you want to fix tsc vs seccomp
> > as well.
>
> This will crash anything that tries rdpmc in an allow-everything
> seccomp sandbox. It's also not very compatible with my grand scheme
> of allowing rdtsc to be turned off without breaking clock_gettime. :)
Well, we clear cap_user_rdpmc, so everybody who still tries it gets what
he deserves, no problem there.
WARNING: multiple messages have this Message-ID (diff)
From: Peter Zijlstra <peterz@infradead.org>
To: Andy Lutomirski <luto@amacapital.net>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@redhat.com>, Kees Cook <keescook@chromium.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Erik Bosman <ebn310@few.vu.nl>, "H. Peter Anvin" <hpa@zytor.com>,
Linux API <linux-api@vger.kernel.org>,
Michael Kerrisk-manpages <mtk.manpages@gmail.com>,
Paul Mackerras <paulus@samba.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
X86 ML <x86@kernel.org>
Subject: Re: [PATCH] x86,seccomp,prctl: Remove PR_TSC_SIGSEGV and seccomp TSC filtering
Date: Fri, 3 Oct 2014 23:12:04 +0200 [thread overview]
Message-ID: <20141003211204.GQ10583@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <CALCETrW7OCuAiK31iRvXgXJfcf3FE4GKjpKQ0doWFyUpETzT9A@mail.gmail.com>
On Fri, Oct 03, 2014 at 02:04:53PM -0700, Andy Lutomirski wrote:
> On Fri, Oct 3, 2014 at 2:02 PM, Peter Zijlstra <peterz@infradead.org> wrote:
> > Something like so.. slightly less ugly and possibly with more
> > complicated conditions setting the cr4 if you want to fix tsc vs seccomp
> > as well.
>
> This will crash anything that tries rdpmc in an allow-everything
> seccomp sandbox. It's also not very compatible with my grand scheme
> of allowing rdtsc to be turned off without breaking clock_gettime. :)
Well, we clear cap_user_rdpmc, so everybody who still tries it gets what
he deserves, no problem there.
next prev parent reply other threads:[~2014-10-03 21:12 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-03 17:18 [PATCH] x86,seccomp,prctl: Remove PR_TSC_SIGSEGV and seccomp TSC filtering Andy Lutomirski
[not found] ` <fc0c2447cbc39257941c6b118388c024b719353a.1412356529.git.luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>
2014-10-03 17:27 ` Andy Lutomirski
2014-10-03 17:27 ` Andy Lutomirski
[not found] ` <CALCETrUfCrvidOS6VvUpWFAcHUrPUs58zSQqGRC5UOTS=E37rw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-10-03 20:14 ` Peter Zijlstra
2014-10-03 20:14 ` Peter Zijlstra
[not found] ` <20141003201409.GM10583-IIpfhp3q70z/8w/KjCw3T+5/BudmfyzbbVWyRVo5IupeoWH0uzbU5w@public.gmane.org>
2014-10-03 20:22 ` Andy Lutomirski
2014-10-03 20:22 ` Andy Lutomirski
2014-10-03 20:27 ` Andy Lutomirski
[not found] ` <CALCETrWfrWpdMCAYySMAMGCHU3XRkNGmeMTECTE=PXQUfjGPZA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-10-03 20:44 ` Peter Zijlstra
2014-10-03 20:44 ` Peter Zijlstra
[not found] ` <20141003204443.GP10583-IIpfhp3q70z/8w/KjCw3T+5/BudmfyzbbVWyRVo5IupeoWH0uzbU5w@public.gmane.org>
2014-10-03 20:46 ` Andy Lutomirski
2014-10-03 20:46 ` Andy Lutomirski
2014-10-03 21:02 ` Peter Zijlstra
2014-10-03 21:02 ` Peter Zijlstra
[not found] ` <20141003210213.GG6324-IIpfhp3q70z/8w/KjCw3T+5/BudmfyzbbVWyRVo5IupeoWH0uzbU5w@public.gmane.org>
2014-10-03 21:04 ` Peter Zijlstra
2014-10-03 21:04 ` Peter Zijlstra
2014-10-03 21:04 ` Andy Lutomirski
2014-10-03 21:04 ` Andy Lutomirski
[not found] ` <CALCETrW7OCuAiK31iRvXgXJfcf3FE4GKjpKQ0doWFyUpETzT9A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-10-03 21:12 ` Peter Zijlstra [this message]
2014-10-03 21:12 ` Peter Zijlstra
[not found] ` <20141003211204.GQ10583-IIpfhp3q70z/8w/KjCw3T+5/BudmfyzbbVWyRVo5IupeoWH0uzbU5w@public.gmane.org>
2014-10-03 21:15 ` Andy Lutomirski
2014-10-03 21:15 ` Andy Lutomirski
2014-10-04 8:13 ` Peter Zijlstra
2014-10-06 16:44 ` Andy Lutomirski
[not found] ` <CALCETrVvFP66s5XOmSKaC8Vq73=uh11819HOOLkVTu7jJZotew-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-10-03 20:42 ` Peter Zijlstra
2014-10-03 20:42 ` Peter Zijlstra
2014-10-03 20:53 ` Andy Lutomirski
[not found] ` <20141003174141.GR2342@redhat.com>
[not found] ` <20141003174141.GR2342-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2014-10-03 17:59 ` Andy Lutomirski
2014-10-03 17:59 ` Andy Lutomirski
2014-10-03 20:15 ` Peter Zijlstra
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