Commit 7cd882df authored by Rohan McLure's avatar Rohan McLure Committed by Michael Ellerman
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powerpc/64: Sanitise user registers on interrupt in pseries, POWERNV 



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: default avatarNicholas Piggin <npiggin@gmail.com>
Signed-off-by: default avatarRohan McLure <rmclure@linux.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221201071019.1953023-7-rmclure@linux.ibm.com
parent efe1691a

arch/powerpc/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -537,7 +537,7 @@ 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