Re: [PATCH 1/2] selftests/lkdtm: add config and turn off CFI_FORWARD_PROTO

[Muhammad Usama Anjum <usama.anjum@collabora.com>]

Any thoughts?

On 3/10/22 10:21 PM, Muhammad Usama Anjum wrote:
> On 3/10/22 12:22 AM, Kees Cook wrote:
>> On Fri, Feb 18, 2022 at 01:56:19AM +0500, Muhammad Usama Anjum wrote:
>>> Add config options which are needed for LKDTM sub-tests.
>>> STACKLEAK_ERASING test needs GCC_PLUGIN_STACKLEAK config.
>>> READ_AFTER_FREE and READ_BUDDY_AFTER_FREE tests need
>>> INIT_ON_FREE_DEFAULT_ON config.
>>>
>>> CFI_FORWARD_PROTO always fails as there is no active CFI system of some
>>> kind. Turn it off for now by default until proper support.
>>
>> Building under LTO Clang on arm64, this is available. What's the right
>> way to add a CONFIG that isn't always available?
>>
>> -Kees
> Yeah, as you had mentioned
> (https://github.com/kernelci/kernelci-project/issues/84#issuecomment-1042015431):
> 
> CFI_FORWARD_PROTO is going to fail unless there is an active CFI system
> in place of some kind. Right now this depends on arm64+Clang. In the
> future, this will be arch-agnostic+Clang, but for the moment, it should
> be safe to exclude this test.
> 
> In this patch, I'm turning off CFI_FORWARD_PROTO by default here. We can
> re-enable it when it becomes arch agnostic. CFI_FORWARD_PROTO cannot be
> turned off by using a config. Please let me know your thoughts otherwise.
> 

-- 
Muhammad Usama Anjum