Re: [PATCH v15 00/26] Control-flow Enforcement: Shadow Stack

Yu, Yu-cheng
2020-11-28T22:24:41Z

On 11/27/2020 1:29 AM, Balbir Singh wrote:
> On Tue, Nov 10, 2020 at 08:21:45AM -0800, Yu-cheng Yu wrote:
>> Control-flow Enforcement (CET) is a new Intel processor feature that blocks
>> return/jump-oriented programming attacks. Details are in "Intel 64 and
>> IA-32 Architectures Software Developer's Manual" [1].
>>
>> CET can protect applications and the kernel. This series enables only
>> application-level protection, and has three parts:
>>
>> - Shadow stack [2],
>> - Indirect branch tracking [3], and
>> - Selftests [4].
>>
>> I have run tests on these patches for quite some time, and they have been
>> very stable. Linux distributions with CET are available now, and Intel
>> processors with CET are becoming available. It would be nice if CET
>> support can be accepted into the kernel. I will be working to address any
>> issues should they come up.
>>
>
> Is there a way to run these patches for testing? Bochs emulation or anything
> else? I presume you've been testing against violations of CET in user space?
> Can you share your testing?
>
> Balbir Singh.
>

Machines with CET are already available on the market. I tested these
on real machines with Fedora. There is a quick test in my earlier
selftest patches:

https://lore.kernel.org/linux-api/20200521211720.20236-6-yu-cheng.yu@intel.com/

Thanks,
Yu-cheng