From: Will Deacon <will@kernel.org>
To: Vladimir Murzin <vladimir.murzin@arm.com>
Cc: linux-arm-kernel@lists.infradead.org, keescook@chromium.org,
dave.martin@arm.com, catalin.marinas@arm.com
Subject: Re: [PATCH v4 1/2] arm64: Support execute-only permissions with Enhanced PAN
Date: Thu, 25 Mar 2021 19:06:33 +0000 [thread overview]
Message-ID: <20210325190632.GD15860@willie-the-truck> (raw)
In-Reply-To: <20210312173811.58284-2-vladimir.murzin@arm.com>
On Fri, Mar 12, 2021 at 05:38:10PM +0000, Vladimir Murzin wrote:
> Enhanced Privileged Access Never (EPAN) allows Privileged Access Never
> to be used with Execute-only mappings.
>
> Absence of such support was a reason for 24cecc377463 ("arm64: Revert
> support for execute-only user mappings"). Thus now it can be revisited
> and re-enabled.
>
> Cc: Kees Cook <keescook@chromium.org>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
> ---
> arch/arm64/Kconfig | 17 +++++++++++++++
> arch/arm64/include/asm/cpucaps.h | 3 ++-
> arch/arm64/include/asm/pgtable-prot.h | 5 +++--
> arch/arm64/include/asm/pgtable.h | 31 ++++++++++++++++++++-------
> arch/arm64/include/asm/sysreg.h | 3 ++-
> arch/arm64/kernel/cpufeature.c | 12 +++++++++++
> arch/arm64/mm/fault.c | 18 +++++++++++++++-
> mm/mmap.c | 6 ++++++
> 8 files changed, 82 insertions(+), 13 deletions(-)
Acked-by: Will Deacon <will@kernel.org>
Will
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next prev parent reply other threads:[~2021-03-25 19:08 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-12 17:38 [PATCH v4 0/2] arm64: Support Enhanced PAN Vladimir Murzin
2021-03-12 17:38 ` [PATCH v4 1/2] arm64: Support execute-only permissions with " Vladimir Murzin
2021-03-25 19:06 ` Will Deacon [this message]
2021-03-26 11:04 ` Catalin Marinas
2021-03-30 8:47 ` Geert Uytterhoeven
2021-03-30 9:30 ` Catalin Marinas
2021-03-30 9:34 ` Geert Uytterhoeven
2021-03-12 17:38 ` [PATCH v4 2/2] arm64: Introduce HWCAPS2_EXECONLY Vladimir Murzin
2021-03-25 19:00 ` Will Deacon
2021-03-26 9:35 ` Catalin Marinas
2021-03-29 8:53 ` Will Deacon
2021-03-26 11:05 ` (subset) [PATCH v4 0/2] arm64: Support Enhanced PAN Catalin Marinas
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