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

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Date:	Wed, 9 Apr 2014 12:43:33 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Ralf Baechle <ralf@...ux-mips.org>
Cc:	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Sanjay Lal <sanjayl@...asys.com>,
	John Crispin <blogic@...nwrt.org>, linux-mips@...ux-mips.org,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] mips: export icache_flush_range

On Mon, Apr 7, 2014 at 6:58 AM, Paul Gortmaker
<paul.gortmaker@...driver.com> wrote:
> 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/

Ralf, you acked this offlist, but someone needs to pull this into the tree?

On Mar 24, Ralf Baechle wrote:
> Acked-by: Ralf Baechle <ralf@...ux-mips.org>

Thanks!

-Kees

>
> 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
>>
>>
>>



-- 
Kees Cook
Chrome OS Security
--
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