linux-kernel - Re: [PATCH v2 21/31] arm64: 32-bit (compat) applications support

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Message-Id: <201208161239.31409.arnd@arndb.de>
Date:	Thu, 16 Aug 2012 12:39:31 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Will Deacon <will.deacon@....com>
Cc:	Catalin Marinas <Catalin.Marinas@....com>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 21/31] arm64: 32-bit (compat) applications support

On Thursday 16 August 2012, Will Deacon wrote:
> 
> On Wed, Aug 15, 2012 at 03:34:04PM +0100, Arnd Bergmann wrote:
> > On Tuesday 14 August 2012, Catalin Marinas wrote:
> > > +asmlinkage int compat_sys_personality(compat_ulong_t personality)
> > > +{
> > > +   int ret;
> > > +
> > > +   if (personality(current->personality) == PER_LINUX32 &&
> > > +           personality == PER_LINUX)
> > > +           personality = PER_LINUX32;
> > > +   ret = sys_personality(personality);
> > > +   if (ret == PER_LINUX32)
> > > +           ret = PER_LINUX;
> > > +   return ret;
> > > +}
> > 
> > Where did you get this from?
> > 
> > You should not need compat_sys_personality, just call the native function.
> 
> Hmm, but in that case an aarch32 application doing a personality(PER_LINUX)
> syscall will start seeing the wrong uname.

Not the wrong uname, just the default one, which is correct.

	Arnd
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