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From: Rohan McLure <rmclure@linux.ibm.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: Rohan McLure <rmclure@linux.ibm.com>
Subject: [PATCH v2 4/4] powerpc/64s: Sanitise user registers on interrupt in pseries
Date: Mon,  7 Nov 2022 14:32:02 +1100	[thread overview]
Message-ID: <20221107033202.1375238-4-rmclure@linux.ibm.com> (raw)
In-Reply-To: <20221107033202.1375238-1-rmclure@linux.ibm.com>

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.

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/
---
 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


  parent reply	other threads:[~2022-11-07  6:31 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-07  3:31 [PATCH v2 1/4] powerpc/64: Add INTERRUPT_SANITIZE_REGISTERS Kconfig Rohan McLure
2022-11-07  3:32 ` [PATCH v2 2/4] powerpc/64s: Clear gprs on interrupt routine entry on Book3S Rohan McLure
2022-11-28  1:52   ` Nicholas Piggin
2022-11-07  3:32 ` [PATCH v2 3/4] powerpc/64e: Clear gprs on interrupt routine entry on Book3E Rohan McLure
2022-11-28  2:02   ` Nicholas Piggin
2022-11-07  3:32 ` Rohan McLure [this message]
2022-11-28  2:12   ` [PATCH v2 4/4] powerpc/64s: Sanitise user registers on interrupt in pseries Nicholas Piggin
2022-11-07 14:28 ` [PATCH v2 1/4] powerpc/64: Add INTERRUPT_SANITIZE_REGISTERS Kconfig Christophe Leroy
2022-11-28  1:42   ` Nicholas Piggin
2022-11-07 16:39 ` Segher Boessenkool
2022-11-08 10:09   ` Nicholas Piggin

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