On Thu, 28 Jul 2022 00:32:17 +1000, Michael Ellerman wrote:
> On a bare-metal Power8 system that doesn't have an "ibm,power-rng", a
> malicious QEMU and guest that ignore the absence of the
> KVM_CAP_PPC_HWRNG flag, and calls H_RANDOM anyway, will dereference a
> NULL pointer.
>
> In practice all Power8 machines have an "ibm,power-rng", but let's not
> rely on that, add a NULL check and early return in
> powernv_get_random_real_mode().
>
> [...]
Applied to powerpc/next.
[1/3] powerpc/powernv: Avoid crashing if rng is NULL
https://git.kernel.org/powerpc/c/90b5d4fe0b3ba7f589c6723c6bfb559d9e83956a
[2/3] powerpc/powernv/kvm: Use darn for H_RANDOM on Power9
https://git.kernel.org/powerpc/c/7ef3d06f1bc4a5e62273726f3dc2bd258ae1c71f
[3/3] powerpc/powernv: rename remaining rng powernv_ functions to pnv_
https://git.kernel.org/powerpc/c/978030f054ff97d9079b35f0178e2013918fb316
cheers
