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

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: <56DDBE68.6080709@linux.intel.com>
Date:	Mon, 7 Mar 2016 09:46:16 -0800
From:	Dave Hansen <dave.hansen@...ux.intel.com>
To:	Khalid Aziz <khalid.aziz@...cle.com>,
	Andy Lutomirski <luto@...capital.net>,
	Rob Gardner <rob.gardner@...cle.com>
Cc:	David Miller <davem@...emloft.net>,
	Jonathan Corbet <corbet@....net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	dingel@...ux.vnet.ibm.com, zhenzhang.zhang@...wei.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,
	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>, 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 03/07/2016 08:06 AM, Khalid Aziz wrote:
> Top 4-bits of sparc64 virtual address are used for version tag only when
> a process has its PSTATE.mcde bit set and it is accessing a memory
> region that has ADI enabled on it (TTE.mcd set) and a version tag was
> set on the virtual address being accessed. These 4-bits retain their
> original semantics in all other cases.

OK, so this effectively reduces the address space of a process using the
feature.  Do we need to do anything explicit to keep an app from using
that address space?  Do we make sure the kernel doesn't place VMAs
there?  Do we respect mmap() hints that try to place memory there?