linux-kernel - Re: [PATCH v2] perf: Handle compat ioctl

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Message-ID: <20140707124315.GN6758@twins.programming.kicks-ass.net>
Date:	Mon, 7 Jul 2014 14:43:15 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Pawel Moll <pawel.moll@....com>
Cc:	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Drew Richardson <Drew.Richardson@....com>
Subject: Re: [PATCH v2] perf: Handle compat ioctl

On Tue, Jul 01, 2014 at 05:06:00PM +0100, Pawel Moll wrote:
> On Tue, 2014-06-17 at 13:43 +0100, Pawel Moll wrote:
> > When running a 32-bit userspace on a 64-bit kernel (eg. i386
> > application on x86_64 kernel or 32-bit arm userspace on arm64
> > kernel) some of the perf ioctls must be treated with special
> > care, as they have a pointer size encoded in the command.
> > 
> > For example, PERF_EVENT_IOC_ID in 32-bit world will be encoded
> > as 0x80042407, but 64-bit kernel will expect 0x80082407. In
> > result the ioctl will fail returning -ENOTTY.
> > 
> > This patch solves the problem by adding code fixing up the
> > size as compat_ioctl file operation.
> > 
> > Reported-by: Drew Richardson <drew.richardson@....com>
> > Signed-off-by: Pawel Moll <pawel.moll@....com>
> 
> This just is a polite and friendly nag...
> 
> Any, strong or not, opinions on the matter?

Sorry, travel, cracks, falling, etc..

Queued it, we'll see what happens with this one ;-)

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