llvm dev - Feb 2017 - SafeStack on ARM platform

Hi,

I would like to use SafeStack sanitize option on ARM platform. Since Linux libc
does not implement such functionality (in opposite to FreeBSD or Android), I
need to use SafeStack compiler RT library. Unfortunately I've noticed that
libclang_rt.safestack is not compiled/built for ARM platform. Looking into cmake
file:
"set(ALL_SAFESTACK_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM64} ${MIPS32}"
ARM32 is not there. My question is why? Is it due to some memory consumption
reasons?

BTW. If I add ARM32 there, libclang_rt.safestack is built for ARM without
problems. Then I can compile some application and run it on the ARM platform,
also without any issues (at least with simple apps).

Regards,
Michal

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On 1 February 2017 at 16:17, via llvm-dev <llvm-dev at lists.llvm.org>
wrote:
> ARM32 is not there. My question is why? Is it due to some memory
consumption
> reasons?
AFAIK there was no interest, until now. :)

> BTW. If I add ARM32 there, libclang_rt.safestack is built for ARM without
> problems. Then I can compile some application and run it on the ARM
> platform, also without any issues (at least with simple apps).
It's all still experimental so, If all the tests pass and are stable,
I have no problems with it being turned on by default.

cheers,
--renato

Hi,

Thanks for the feedback.
Well, I tested it so far with only one application - nginx server and didn't
find any issue on ARM platform.
Probably not a final prove, but still some evidence that it is working.

Regards,
Michal

-----Original Message-----
From: Renato Golin [mailto:renato.golin at linaro.org] 
Sent: Wednesday, February 01, 2017 5:39 PM
To: Kurek, Michal
Cc: LLVM Dev
Subject: Re: [llvm-dev] SafeStack on ARM platform

On 1 February 2017 at 16:17, via llvm-dev <llvm-dev at lists.llvm.org>
wrote:
> ARM32 is not there. My question is why? Is it due to some memory 
> consumption reasons?
AFAIK there was no interest, until now. :)

> BTW. If I add ARM32 there, libclang_rt.safestack is built for ARM 
> without problems. Then I can compile some application and run it on 
> the ARM platform, also without any issues (at least with simple apps).
It's all still experimental so, If all the tests pass and are stable, I have
no problems with it being turned on by default.

cheers,
--renato