From: Peter Zijlstra <peterz@infradead.org>
To: Stephane Eranian <eranian@google.com>
Cc: Ingo Molnar <mingo@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
"mingo@elte.hu" <mingo@elte.hu>,
"ak@linux.intel.com" <ak@linux.intel.com>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
David Ahern <dsahern@gmail.com>, Jiri Olsa <jolsa@redhat.com>,
Hugh Dickins <hughd@google.com>,
Kees Cook <keescook@chromium.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [RFC] perf: mmap2 not covering VM_CLONE regions
Date: Wed, 2 Oct 2013 15:01:44 +0200 [thread overview]
Message-ID: <20131002130143.GF28601@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <CABPqkBQyCfz5d+SQxDwPD5m52ofE6y5HKur+s-F0s=hN00cxkw@mail.gmail.com>
On Wed, Oct 02, 2013 at 02:59:32PM +0200, Stephane Eranian wrote:
> On Wed, Oct 2, 2013 at 2:46 PM, Peter Zijlstra <peterz@infradead.org> wrote:
> > On Wed, Oct 02, 2013 at 02:39:53PM +0200, Ingo Molnar wrote:
> >> - then there are timing attacks, and someone having access to a PMU
> >> context and who can trigger this SHA1 computation arbitrarily in task
> >> local context can run very accurate and low noise timing attacks...
> >>
> >> I don't think the kernel's sha_transform() is hardened against timing
> >> attacks, it's performance optimized so it has variable execution time
> >> highly dependent on plaintext input - which leaks information about the
> >> plaintext.
> >
> > Typical user doesn't have enough priv to profile kernel space; once you
> > do you also have enough priv to see kernel addresses outright (ie.
> > kallsyms etc..).
> >
> I was going to say just that. But that's not the default, paranoid level
> is at 1 by default and not 2. So I supposedly can still do:
Oh right you are.. so yes that's a very viable avenue.
next prev parent reply other threads:[~2013-10-02 13:02 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-30 15:44 Stephane Eranian
2013-09-30 16:15 ` Peter Zijlstra
2013-09-30 16:48 ` Stephane Eranian
2013-09-30 16:54 ` Peter Zijlstra
2013-10-01 11:22 ` Stephane Eranian
2013-10-02 11:23 ` Peter Zijlstra
2013-10-02 11:58 ` Peter Zijlstra
2013-10-02 12:39 ` Ingo Molnar
2013-10-02 12:46 ` Peter Zijlstra
2013-10-02 12:59 ` Stephane Eranian
2013-10-02 13:01 ` Peter Zijlstra [this message]
2013-10-02 13:13 ` Stephane Eranian
2013-10-02 13:37 ` Peter Zijlstra
2013-10-02 17:14 ` Kees Cook
2013-10-02 17:20 ` Stephane Eranian
2013-10-02 17:29 ` Kees Cook
2013-10-02 17:49 ` Stephane Eranian
2013-10-02 18:10 ` Kees Cook
2013-10-02 19:00 ` Peter Zijlstra
2013-10-02 19:38 ` Kees Cook
2013-10-02 20:31 ` Peter Zijlstra
2013-10-03 8:55 ` Stephane Eranian
2013-10-03 9:03 ` Peter Zijlstra
2013-10-03 9:13 ` Stephane Eranian
2013-10-03 15:34 ` Kees Cook
2013-10-07 21:04 ` Stephane Eranian
2013-10-08 6:54 ` Peter Zijlstra
2013-10-08 7:15 ` Stephane Eranian
2013-10-08 9:36 ` Peter Zijlstra
2013-10-08 9:42 ` Stephane Eranian
2013-10-08 9:54 ` Peter Zijlstra
2013-10-03 18:32 ` Andi Kleen
2013-10-07 11:16 ` Stephane Eranian
2013-10-07 11:32 ` Peter Zijlstra
2013-10-02 15:22 ` Ingo Molnar
2013-10-08 14:23 ` David Ahern
2013-10-08 19:41 ` Ingo Molnar
2013-10-08 19:54 ` Stephane Eranian
2013-10-08 19:57 ` David Ahern
2013-10-09 9:54 ` Ingo Molnar
2013-10-09 9:59 ` Ingo Molnar
2013-10-09 10:39 ` Peter Zijlstra
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