linux-kernel - Re: [PATCH 2/2] arch: Reserve map_shadow_stack() syscall number for all architectures

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Message-ID: <8b7106881fa227a64b4e951c6b9240a7126ac4a2.camel@intel.com>
Date:   Mon, 11 Sep 2023 21:10:26 +0000
From:   "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To:     "Mehta, Sohil" <sohil.mehta@...el.com>,
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Subject: Re: [PATCH 2/2] arch: Reserve map_shadow_stack() syscall number for
 all architectures

On Mon, 2023-09-11 at 18:02 +0000, Sohil Mehta wrote:
> diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl
> b/arch/powerpc/kernel/syscalls/syscall.tbl
> index 20e50586e8a2..2767b8a42636 100644
> --- a/arch/powerpc/kernel/syscalls/syscall.tbl
> +++ b/arch/powerpc/kernel/syscalls/syscall.tbl
> @@ -539,3 +539,4 @@
>  450    nospu   set_mempolicy_home_node         sys_set_mempolicy_hom
> e_node
>  451    common  cachestat                       sys_cachestat
>  452    common  fchmodat2                       sys_fchmodat2
> +453    common  map_shadow_stack                sys_map_shadow_stack

I noticed in powerpc, the not implemented syscalls are manually mapped
to sys_ni_syscall. It also has some special extra sys_ni_syscall()
implementation bits to handle both ARCH_HAS_SYSCALL_WRAPPER and
!ARCH_HAS_SYSCALL_WRAPPER. So wondering if it might need special
treatment. Did you see those parts?