On Tue Nov 29, 2022 at 2:43 PM AEST, Rohan McLure wrote: > Cause pseries and POWERNV platforms to default to zeroising all potentially > user-defined registers when entering the kernel by means of any interrupt > source, reducing user-influence of the kernel and the likelihood or > producing speculation gadgets. > > Signed-off-by: Rohan McLure <rmcl...@linux.ibm.com> Acked-by: Nicholas Piggin <npig...@gmail.com>
> --- > Resubmitting patches as their own series after v6 partially merged: > Link: > https://lore.kernel.org/all/166488988686.779920.13794870102696416283.b4...@ellerman.id.au/t/ > v4: Default on POWERNV as well. > --- > arch/powerpc/Kconfig | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig > index 280c797e0f30..2ab114a02f62 100644 > --- a/arch/powerpc/Kconfig > +++ b/arch/powerpc/Kconfig > @@ -534,7 +534,7 @@ config HOTPLUG_CPU > config INTERRUPT_SANITIZE_REGISTERS > bool "Clear gprs on interrupt arrival" > depends on PPC64 && ARCH_HAS_SYSCALL_WRAPPER > - default PPC_BOOK3E_64 > + default PPC_BOOK3E_64 || PPC_PSERIES || PPC_POWERNV > help > Reduce the influence of user register state on interrupt handlers and > syscalls through clearing user state from registers before handling > -- > 2.37.2
