On Thu, 30 May 2024 19:44:12 -0500, Nathan Lynch wrote:

Smatch warns:

  arch/powerpc/kernel/rtas.c:1932 __do_sys_rtas() warn: potential
  spectre issue 'args.args' [r] (local cap)

The 'nargs' and 'nret' locals come directly from a user-supplied
buffer and are used as indexes into a small stack-based array and as
inputs to copy_to_user() after they are subject to bounds checks.

[...]

Applied to powerpc/next.

[1/1] powerpc/rtas: Prevent Spectre v1 gadget construction in sys_rtas()
      https://git.kernel.org/powerpc/c/0974d03eb479384466d828d65637814bee6b26d7

cheers