linux-kernel - Re: [PATCH 0/7] test_user

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Date:	Thu, 6 Aug 2015 02:50:09 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	James Hogan <james.hogan@...tec.com>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-mips@...ux-mips.org, Kees Cook <keescook@...omium.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 0/7] test_user_copy improvements

Hi James,

On Wed, Aug 05, 2015 at 04:48:48PM +0100, James Hogan wrote:
> These patches extend the test_user_copy test module to handle lots more
> cases of user accessors which architectures can override separately, and
> in particular those which are important for checking the MIPS Enhanced
> Virtual Addressing (EVA) implementations, which need to handle
> overlapping user and kernel address spaces, with special instructions
> for accessing user address space from kernel mode.
> 
> - Checking that kernel pointers are accepted when user address limit is
>   set to KERNEL_DS, as done by the kernel when it internally invokes
>   system calls with kernel pointers.
> - Checking of the unchecked accessors (which don't call access_ok()).
>   Some of the tests are special cased for EVA at the moment which has
>   stricter hardware guarantees for bad user accesses than other
>   configurations.
> - Checking of other sets of user accessors, including the inatomic user
>   copies, copy_in_user, clear_user, the user string accessors, and the
>   user checksum functions, all of which need special handling in arch
>   code with EVA.
> 
> Tested on MIPS with and without EVA, and on x86_64.
> 
The series causes several build failures with other architectures.

>From next-20150806:

Build results:
	total: 152 pass: 138 fail: 14
Failed builds:
	alpha:allmodconfig (*)
	arm:allmodconfig (*)
	arm:omap2plus_defconfig
	arm64:allmodconfig
	i386:allyesconfig (*)
	i386:allmodconfig (*)
	m68k:defconfig (*)
	m68k:allmodconfig (*)
	m68k:sun3_defconfig (*)
	mips:allmodconfig
	parisc:allmodconfig
	s390:allmodconfig
	sparc32:allmodconfig (*)
	xtensa:allmodconfig (*)

The builds marked with (*) fail because of your patch series.

Guenter
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