linux-kernel - Re: [PATCH] ARM: add get_user() support for 8 byte types

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] [day] [month] [year] [list]

Message-Id: <201211160818.01302.arnd@arndb.de>
Date:	Fri, 16 Nov 2012 08:18:01 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Rob Clark <rob.clark@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, patches@...aro.org,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	Russell King <rmk+kernel@....linux.org.uk>,
	Rob Clark <rob@...com>
Subject: Re: [PATCH] ARM: add get_user() support for 8 byte types

On Thursday 15 November 2012, Rob Clark wrote:
> 
> From: Rob Clark <rob@...com>
> 
> A new atomic modeset/pageflip ioctl being developed in DRM requires
> get_user() to work for 64bit types (in addition to just put_user()).
> 
> v1: original
> v2: pass correct size to check_uaccess, and better handling of narrowing
>     double word read with __get_user_xb() (Russell King's suggestion)
> v3: explain in comment about why this works for narrowing fetch to 1,
>     2, or 4 byte type on ARM.
> 
> Signed-off-by: Rob Clark <rob@...com>

Acked-by: Arnd Bergmann <arnd@...db.de>
--
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/