Re: [PATCHv6 bpf-next 1/9] x86/shstk: Make return uprobe work with shadow stack

[Edgecombe, Rick P]

On Tue, 2024-05-21 at 12:48 +0200, Jiri Olsa wrote:
> Currently the application with enabled shadow stack will crash
> if it sets up return uprobe. The reason is the uretprobe kernel
> code changes the user space task's stack, but does not update
> shadow stack accordingly.
> 
> Adding new functions to update values on shadow stack and using
> them in uprobe code to keep shadow stack in sync with uretprobe
> changes to user stack.
> 
> Fixes: 8b1c23543436 ("x86/shstk: Add return uprobe support")
> Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
> ---
Acked-by: Rick Edgecombe <rick.p.edgecombe@xxxxxxxxx>