Re: [PATCH] x86/shstk: Enable shadow stack for x32

[Dave Hansen]

On 3/22/24 09:52, H.J. Lu wrote:
> On Fri, Mar 22, 2024 at 9:49 AM Dave Hansen <dave.hansen@xxxxxxxxx> wrote:
>> On 3/15/24 07:04, H.J. Lu wrote:
>>> 1. Add shadow stack support to x32 signal.
>>> 2. Use the 64-bit map_shadow_stack syscall for x32.
>>> 3. Set up shadow stack for x32.
>>>
>>> Tested with shadow stack enabled x32 glibc on Intel Tiger Lake.
>> I don't think we should wire up code that's never going to get used in
>> practice.  I think I'd want to be sure of the existence of some
>> specific, real-world, long-term users of this before we add a new ABI
>> that we need to support forever.
>>
>> Are there real users?
> Were you talking about x32 users or x32 users with shadow stack?

x32 users who both want and will use shadow stacks.

It's been a long time since I've seen an x32 bug report.