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powerpc/64: Sanitise user registers on interrupt in pseries, POWERNV

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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 <npiggin@gmail.com>
Signed-off-by: Rohan McLure <rmclure@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221201071019.1953023-7-rmclure@linux.ibm.com
This commit is contained in:
Rohan McLure 2022-12-01 18:10:19 +11:00 committed by Michael Ellerman
parent efe1691ac8
commit 7cd882df94
1 changed files with 1 additions and 1 deletions
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arch/powerpc/Kconfig
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@ -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