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

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Message-ID: <55C33096.1070206@imgtec.com>
Date:	Thu, 6 Aug 2015 11:01:58 +0100
From:	James Hogan <james.hogan@...tec.com>
To:	Guenter Roeck <linux@...ck-us.net>
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>,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH 0/7] test_user_copy improvements

On 06/08/15 10:50, Guenter Roeck wrote:
> 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.

Thanks Guenter, and sorry for the breakage. I've already got some fixes
lined up. From the failure logs it looks like #ifdef CONFIG_COMPAT for
[__]copy_in_user and #ifndef _HAVE_ARCH_COPY_AND_CSUM_FROM_USER for the
the ppc64 csum_partial_copy_from_user one Stephen caught should sort it out.

Cheers
James

> 
> 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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