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

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Message-ID: <20140617121328.GO3213@twins.programming.kicks-ass.net>
Date:	Tue, 17 Jun 2014 14:13:29 +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,
	Drew Richardson <drew.richardson@....com>
Subject: Re: [PATCH] perf: Handle compat ioctl

On Fri, Jun 13, 2014 at 04:03:32PM +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 gets me (on my favourite x86_64 .config):

kernel/events/core.c: In function ‘perf_compat_ioctl’:
kernel/events/core.c:3726:32: error: ‘compat_uptr_t’ undeclared (first use in this function)
kernel/events/core.c:3726:32: note: each undeclared identifier is reported only once for each function it appears in


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