Re: [NEEDS-REVIEW] Re: [PATCH v11 25/25] x86/cet/shstk: Add arch_prctl functions for shadow stack

Dave Hansen
2020-09-15T19:24:55Z

On 9/15/20 12:08 PM, Yu-cheng Yu wrote:
> On Mon, 2020-09-14 at 17:12 -0700, Yu, Yu-cheng wrote:
>> On 9/14/2020 7:50 AM, Dave Hansen wrote:
>>> On 9/11/20 3:59 PM, Yu-cheng Yu wrote:
>>> ...
>>>> Here are the changes if we take the mprotect(PROT_SHSTK) approach.
>>>> Any comments/suggestions?
>>> I still don't like it. :)
>>>
>>> I'll also be much happier when there's a proper changelog to accompany
>>> this which also spells out the alternatives any why they suck so much.
> [...]
>
> I revised it. If this turns out needing more work/discussion, we can split it
> out from the shadow stack series.

Where does that leave things? You only get shadow stacks for
single-threaded apps which have the ELF bits set?