linux-kernel - RE: [RFC] #MC mess

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 for Android: free password hash cracker in your pocket

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

Message-ID: <3908561D78D1C84285E8C5FCA982C28F7F57BDFB@ORSMSX115.amr.corp.intel.com>
Date:   Tue, 18 Feb 2020 20:11:10 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
CC:     Borislav Petkov <bp@...en8.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        Andy Lutomirski <luto@...nel.org>, x86-ml <x86@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: RE: [RFC] #MC mess

> Then please rewrite the #MC entry code to deal with nested exceptions
> unmasking the MCE, very similr to NMI.

#MC doesn't work like NMI.  It isn't enabled by IRET.  Nested #MC cause an
immediate reset.  Detection of nested case is by IA32_MCG_STATUS.MCIP.
We don't clear MCG_STATUS until we are ready to return from the machine
check handler.

-Tony