linux-kernel - Re: [kernel-hardening] Re: [PATCH] ARM: mm: add testcases for RODATA

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Message-ID: <46bae2bb-4b4f-158b-6a8d-3737e181ad74@redhat.com>
Date:   Wed, 18 Jan 2017 15:38:52 -0800
From:   Laura Abbott <labbott@...hat.com>
To:     kernel-hardening@...ts.openwall.com
Cc:     Jinbum Park <jinb.park7@...il.com>, mark.rutland@....com,
        f.fainelli@...il.com, keescook@...omium.org, pawel.moll@....com,
        ard.biesheuvel@...aro.org, kernel-janitors@...r.kernel.org,
        will.deacon@....com, linux-kernel@...r.kernel.org,
        paul.gortmaker@...driver.com, vladimir.murzin@....com,
        andy.gross@...aro.org, arjan@...ux.intel.com, mingo@...nel.org,
        linux-arm-kernel@...ts.infradead.org, jonathan.austin@....com
Subject: Re: [kernel-hardening] Re: [PATCH] ARM: mm: add testcases for RODATA

On 01/18/2017 02:36 PM, Russell King - ARM Linux wrote:
> On Wed, Jan 18, 2017 at 11:20:54AM -0800, Laura Abbott wrote:
>> On 01/18/2017 05:53 AM, Jinbum Park wrote:
>>> diff --git a/arch/arm/include/asm/cacheflush.h b/arch/arm/include/asm/cacheflush.h
>>> index bdd283b..741e2e8 100644
>>> --- a/arch/arm/include/asm/cacheflush.h
>>> +++ b/arch/arm/include/asm/cacheflush.h
>>> @@ -498,6 +498,16 @@ static inline void set_kernel_text_rw(void) { }
>>>  static inline void set_kernel_text_ro(void) { }
>>>  #endif
>>>  
>>> +#ifdef CONFIG_DEBUG_RODATA_TEST
>>> +extern const int rodata_test_data;
>>> +int rodata_test(void);
>>> +#else
>>> +static inline int rodata_test(void)
>>> +{
>>> +	return 0;
>>> +}
>>> +#endif
>>> +
> 
> I don't see why this needs to be in cacheflush.h - it doesn't seem to
> have anything to do with cache flushing, and placing it in here means
> that if you change the state of CONFIG_DEBUG_RODATA_TEST, most likely
> the entire kernel gets rebuilt.  Please put it in a separate header
> file.
> 

cacheflush.h seems to be where all the set_memory_* functions have
ended up. I was just looking at cleaning that up unless someone
beats me to it.

Thanks,
Laura