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.
Acked-by: Nicholas Piggin <npig...@gmail.com> Signed-off-by: Rohan McLure <rmcl...@linux.ibm.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
