From: "Nicholas Piggin" <npiggin@gmail•com>
To: "Rohan McLure" <rmclure@linux•ibm.com>, <linuxppc-dev@lists•ozlabs.org>
Subject: Re: [PATCH v2 4/4] powerpc/64s: Sanitise user registers on interrupt in pseries
Date: Mon, 28 Nov 2022 12:12:47 +1000 [thread overview]
Message-ID: <CONKCZH8X4AN.37OXY0MSXXXF6@bobo> (raw)
In-Reply-To: <20221107033202.1375238-4-rmclure@linux.ibm.com>
On Mon Nov 7, 2022 at 1:32 PM AEST, Rohan McLure wrote:
> 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.
For POWERNV as well?
Thanks,
Nick
>
> 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
next prev parent reply other threads:[~2022-11-28 2:13 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 ` [PATCH v2 4/4] powerpc/64s: Sanitise user registers on interrupt in pseries Rohan McLure
2022-11-28 2:12 ` Nicholas Piggin [this message]
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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