From: Rohan McLure <rmclure@linux•ibm.com>
To: linuxppc-dev@lists•ozlabs.org
Cc: Rohan McLure <rmclure@linux•ibm.com>, npiggin@gmail•com
Subject: [PATCH v4 7/7] powerpc/64: Sanitise user registers on interrupt in pseries, POWERNV
Date: Tue, 29 Nov 2022 15:43:54 +1100 [thread overview]
Message-ID: <20221129044354.1836018-7-rmclure@linux.ibm.com> (raw)
In-Reply-To: <20221129044354.1836018-1-rmclure@linux.ibm.com>
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.
Signed-off-by: Rohan McLure <rmclure@linux•ibm.com>
---
Resubmitting patches as their own series after v6 partially merged:
Link: https://lore.kernel.org/all/166488988686.779920.13794870102696416283.b4-ty@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
next prev parent reply other threads:[~2022-11-29 4:50 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-29 4:43 [PATCH v4 1/7] powerpc/64: Add INTERRUPT_SANITIZE_REGISTERS Kconfig Rohan McLure
2022-11-29 4:43 ` [PATCH v4 2/7] powerpc/64: Add interrupt register sanitisation macros Rohan McLure
2022-11-29 9:40 ` Nicholas Piggin
2022-11-29 4:43 ` [PATCH v4 3/7] powerpc/64: Sanitise common exit code for interrupts Rohan McLure
2022-11-29 9:46 ` Nicholas Piggin
2022-11-29 4:43 ` [PATCH v4 4/7] powerpc/64s: IOption for MSR stored in r12 Rohan McLure
2022-11-29 9:48 ` Nicholas Piggin
2022-11-29 4:43 ` [PATCH v4 5/7] powerpc/64s: Zeroise gprs on interrupt routine entry on Book3S Rohan McLure
2022-11-29 10:20 ` Nicholas Piggin
2022-11-29 4:43 ` [PATCH v4 6/7] powerpc/64e: Clear gprs on interrupt routine entry on Book3E Rohan McLure
2022-11-29 4:43 ` Rohan McLure [this message]
2022-11-29 10:21 ` [PATCH v4 7/7] powerpc/64: Sanitise user registers on interrupt in pseries, POWERNV Nicholas Piggin
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