linux-kernel - Re: [PATCH V2 2/3] perf protect LBR when Intel PT is enabled.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20140703155237.GQ5714@two.firstfloor.org>
Date:	Thu, 3 Jul 2014 17:52:37 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	kan.liang@...el.com, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, andi@...stfloor.org
Subject: Re: [PATCH V2 2/3] perf protect LBR when Intel PT is enabled.

> If there's active LBR users out there, we should refuse to enable PT and
> vice versa. 

This doesn't work, e.g. hardware debuggers can take over at any time.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
--
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/