linux-kernel - Re: [PATCH] mips: export icache_flush

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Message-ID: <5342AEEF.4080503@windriver.com>
Date:	Mon, 7 Apr 2014 09:58:07 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	Kees Cook <keescook@...omium.org>
CC:	Ralf Baechle <ralf@...ux-mips.org>,
	Sanjay Lal <sanjayl@...asys.com>,
	John Crispin <blogic@...nwrt.org>, <linux-mips@...ux-mips.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mips: export icache_flush_range

On 14-03-22 03:05 PM, Kees Cook wrote:
> On Sat, Mar 22, 2014 at 9:47 AM, Kees Cook <keescook@...omium.org> wrote:
>> The lkdtm module performs tests against executable memory ranges, so
>> it needs to flush the icache for proper behaviors. Other architectures
>> already export this, so do the same for MIPS.
>>
>> Signed-off-by: Kees Cook <keescook@...omium.org>
>> ---
>> This is currently untested! I'm building a MIPS cross-compiler now...
>> If someone can validate this fixes the build when lkdtm is a module,
>> that would be appreciated. :)
> 
> Okay, now tested. I reproduced the failure and this patch fixes it. :)

Just checking if this happened to fall through the cracks.
The most recent (Apr4) linux-next build for mips still fails
with this error.

http://kisskb.ellerman.id.au/kisskb/buildresult/10877159/

Paul.
--

> 
> -Kees
> 
>> ---
>>  arch/mips/mm/cache.c |    1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c
>> index fde7e56d13fe..b3f1df13d9f6 100644
>> --- a/arch/mips/mm/cache.c
>> +++ b/arch/mips/mm/cache.c
>> @@ -38,6 +38,7 @@ void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
>>  void (*__invalidate_kernel_vmap_range)(unsigned long vaddr, int size);
>>
>>  EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range);
>> +EXPORT_SYMBOL_GPL(flush_icache_range);
>>
>>  /* MIPS specific cache operations */
>>  void (*flush_cache_sigtramp)(unsigned long addr);
>> --
>> 1.7.9.5
>>
>>
>> --
>> Kees Cook
>> Chrome OS Security
> 
> 
> 
--
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