[PATCH] fhandler/proc.cc(format_proc_cpuinfo): Add Linux 6.3 cpuinfo

[Jon Turney]

On 08/05/2023 04:12, Brian Inglis wrote:
> cpuid    0x00000007:0 ecx:7 shstk Shadow Stack support & Windows [20]20H1/[20]2004+
> 		    => user_shstk User mode program Shadow Stack support
> AMD SVM  0x8000000a:0 edx:25 vnmi virtual Non-Maskable Interrrupts
> Sync AMD 0x80000008:0 ebx flags across two output locations

Thanks.  I applied this.

Does this need applying to the 3.4 branch as well?

> ---
>   winsup/cygwin/fhandler/proc.cc | 29 ++++++++++++++++++++++-------

>   
> +      /* cpuid 0x00000007 ecx & Windows [20]20H1/[20]2004+ */
> +      if (maxf >= 0x00000007 && wincap.osname () >= "10.0"
> +					 && wincap.build_number () >= 19041)
> +        {
> +	  cpuid (&unused, &unused, &features1, &unused, 0x00000007, 0);
> +	  ftcprint (features1,  7, "user_shstk");	/* "user shadow stack" */
> +	}
> +

This seems a little odd and maybe worthy of a comment, as surely the CPU 
has the capability irrespective of the OS?