From: Valdis.Kletnieks@vt.edu
To: Andy Lutomirski <luto@amacapital.net>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
Paul Mackerras <paulus@samba.org>, Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: Tightening up rdpmc permissions?
Date: Mon, 29 Sep 2014 13:36:22 -0400 [thread overview]
Message-ID: <9930.1412012182@turing-police.cc.vt.edu> (raw)
In-Reply-To: Your message of "Mon, 29 Sep 2014 09:39:16 -0700." <CALCETrU3nNvG6+-7iScYT8LDRFnq8kYnpK0cdW1bgW5O4EGrUg@mail.gmail.com>
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On Mon, 29 Sep 2014 09:39:16 -0700, Andy Lutomirski said:
> Would it make sense to restrict rdpmc to tasks that are in mms that
> have a perf_event mapping? After all, unless I misunderstand
> something, user code can't reliably use rdpmc unless they've mapped a
> perf_event object to check the rdpmc bit and figure out what ecx value
> to use.
Wouldn't that be trivially easy for an attacker to bypass? Just map a dummy
perf_event object and then go to town?
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next prev parent reply other threads:[~2014-09-29 17:38 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-29 16:39 Andy Lutomirski
2014-09-29 16:48 ` Peter Zijlstra
2014-09-29 17:36 ` Valdis.Kletnieks [this message]
2014-09-29 18:42 ` Andy Lutomirski
2014-10-08 23:47 ` Andy Lutomirski
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