linux-kernel - Re: [PATCH v2] [S390] do not clobber personality flags in sys_32

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Message-ID: <20120802124157.GA5742@osiris.boeblingen.de.ibm.com>
Date:	Thu, 2 Aug 2012 14:41:57 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Martin Schwidefsky <schwidefsky@...ibm.com>, linux390@...ibm.com,
	linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] [S390] do not clobber personality flags in
 sys_32_personality()

On Thu, Aug 02, 2012 at 09:11:23AM +0200, Jiri Kosina wrote:
> There are multiple errors in how sys_32_personality() handles personality
> flags stored in top three bytes.
> 
> - directly comparing current->personality against PER_LINUX32 doesn't work
>   in cases when any of the personality flags stored in the top three bytes
>   are used.
> - directly forcefully setting personality to PER_LINUX32 or PER_LINUX
>   discards any flags stored in the top three bytes
> 
> Fix the first one by properly using personality() macro to compare only
> PER_MASK bytes.
> Fix the second one by setting only the bits that should be set, instead of
> overwriting the whole value.

Applied. Thanks!

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