From: "Edgecombe, Rick P" <rick.p.edgecombe@intel.com>
To: "Mehta, Sohil" <sohil.mehta@intel.com>,
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Subject: Re: [PATCH v2] arch: Reserve map_shadow_stack() syscall number for all architectures
Date: Thu, 14 Sep 2023 22:08:05 +0000 [thread overview]
Message-ID: <731438883ae3bcffa05ff014dda773a6c1e3c899.camel@intel.com> (raw)
In-Reply-To: <20230914185804.2000497-1-sohil.mehta@intel.com>
On Thu, 2023-09-14 at 18:58 +0000, Sohil Mehta wrote:
> commit c35559f94ebc ("x86/shstk: Introduce map_shadow_stack syscall")
> recently added support for map_shadow_stack() but it is limited to
> x86
> only for now. There is a possibility that other architectures
> (namely,
> arm64 and RISC-V), that are implementing equivalent support for
> shadow
> stacks, might need to add support for it.
>
> Independent of that, reserving arch-specific syscall numbers in the
> syscall tables of all architectures is good practice and would help
> avoid future conflicts. map_shadow_stack() is marked as a conditional
> syscall in sys_ni.c. Adding it to the syscall tables of other
> architectures is harmless and would return ENOSYS when exercised.
>
> Note, map_shadow_stack() was assigned #453 during the merge process
> since #452 was taken by fchmodat2().
>
> For Powerpc, map it to sys_ni_syscall() as is the norm for Powerpc
> syscall tables.
>
> For Alpha, map_shadow_stack() takes up #563 as Alpha still diverges
> from
> the common syscall numbering system in the other architectures.
Reviewed-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
next prev parent reply other threads:[~2023-09-14 22:08 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-14 18:58 [PATCH v2] arch: Reserve map_shadow_stack() syscall number for all architectures Sohil Mehta
2023-09-14 22:08 ` Edgecombe, Rick P [this message]
2023-09-15 3:23 ` Michael Ellerman
2023-10-03 16:35 ` Sohil Mehta
2023-10-03 16:54 ` Arnd Bergmann
2023-10-03 17:18 ` Sohil Mehta
2023-10-06 20:01 ` Edgecombe, Rick P
2023-10-06 20:29 ` Arnd Bergmann
2023-10-06 20:36 ` Sohil Mehta
2023-10-03 17:19 ` Geert Uytterhoeven
2023-10-04 7:22 ` Catalin Marinas
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