Cause pseries 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. Interrupt sources include syscalls.
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/ Standalone series: new patch --- arch/powerpc/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 9d3d20c6f365..2eb328b25e49 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -532,7 +532,7 @@ 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 help Reduce the influence of user register state on interrupt handlers and syscalls through clearing user state from registers before handling -- 2.34.1
