diff options
| author | Rohan McLure <[email protected]> | 2022-12-01 18:10:19 +1100 |
|---|---|---|
| committer | Michael Ellerman <[email protected]> | 2022-12-02 20:46:09 +1100 |
| commit | 7cd882df9485988f7d9b3fae04fde4e95a4c7a74 (patch) | |
| tree | e15e662bcdd39fafe445532c3b8c8d58c91c1905 | |
| parent | efe1691ac814e4cf3653538b701662cbd905bddc (diff) | |
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: Nicholas Piggin <[email protected]>
Signed-off-by: Rohan McLure <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
| -rw-r--r-- | arch/powerpc/Kconfig | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index aec1431be06e..e21d6de797d6 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -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 |