linux-kernel - Re: [PATCH v2] sparc64: Add support for Application Data Integrity (ADI)

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Message-ID: <56DE1341.4080206@oracle.com>
Date:	Tue, 08 Mar 2016 10:48:17 +1100
From:	James Morris <james.l.morris@...cle.com>
To:	Andy Lutomirski <luto@...capital.net>,
	Khalid Aziz <khalid.aziz@...cle.com>
CC:	David Miller <davem@...emloft.net>,
	Jonathan Corbet <corbet@....net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	dingel@...ux.vnet.ibm.com, bob.picco@...cle.com,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Arnd Bergmann <arnd@...db.de>, sparclinux@...r.kernel.org,
	Rob Gardner <rob.gardner@...cle.com>,
	Michal Hocko <mhocko@...e.cz>, chris.hyser@...cle.com,
	Richard Weinberger <richard@....at>,
	Vlastimil Babka <vbabka@...e.cz>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Greg Thelen <gthelen@...gle.com>, Jan Kara <jack@...e.cz>,
	xiexiuqi@...wei.com, Vineet.Gupta1@...opsys.com,
	Andrew Lutomirski <luto@...nel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Benjamin Segall <bsegall@...gle.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Davidlohr Bueso <dave@...olabs.net>,
	Alexey Dobriyan <adobriyan@...il.com>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	linux-arch <linux-arch@...r.kernel.org>,
	Linux API <linux-api@...r.kernel.org>
Subject: Re: [PATCH v2] sparc64: Add support for Application Data Integrity
 (ADI)

On 03/08/2016 06:54 AM, Andy Lutomirski wrote:
>
> This makes sense, but I still think the design is poor.  If the hacker
> gets code execution, then they can trivially brute force the ADI bits.
>

ADI in this scenario is intended to prevent the attacker from gaining 
code execution in the first place.