From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Will Deacon <will.deacon@arm.com>
Cc: "linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Stephen Boyd <sboyd@codeaurora.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Kees Cook <keescook@chromium.org>,
Mark Salter <msalter@redhat.com>,
Laura Abbott <labbott@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH v2 17/18] arm64: Kconfig: Add CONFIG_UNMAP_KERNEL_AT_EL0
Date: Tue, 12 Dec 2017 09:44:09 +0100 [thread overview]
Message-ID: <CAMuHMdXn5vVxrtD=-+X_SQVX9PXcKQ=9Qh3Xx+M1MoCQ-EWRZQ@mail.gmail.com> (raw)
In-Reply-To: <1512059986-21325-18-git-send-email-will.deacon@arm.com>
Hi Will,
On Thu, Nov 30, 2017 at 5:39 PM, Will Deacon <will.deacon@arm.com> wrote:
> Add a Kconfig entry to control use of the entry trampoline, which allows
> us to unmap the kernel whilst running in userspace and improve the
> robustness of KASLR.
>
> Signed-off-by: Will Deacon <will.deacon@arm.com>
This is now commit 084eb77cd3a81134 in arm64/for-next/core.
> ---
> arch/arm64/Kconfig | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index fdcc7b9bb15d..3af1657fcac3 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -833,6 +833,19 @@ config FORCE_MAX_ZONEORDER
> However for 4K, we choose a higher default value, 11 as opposed to 10, giving us
> 4M allocations matching the default size used by generic code.
>
> +config UNMAP_KERNEL_AT_EL0
> + bool "Unmap kernel when running in userspace (aka \"KAISER\")"
But I believe this is no longer called KAISER?
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
next prev parent reply other threads:[~2017-12-12 8:44 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-30 16:39 [PATCH v2 00/18] arm64: Unmap the kernel whilst running in userspace (KAISER) Will Deacon
2017-11-30 16:39 ` [PATCH v2 01/18] arm64: mm: Use non-global mappings for kernel space Will Deacon
2017-11-30 16:39 ` [PATCH v2 02/18] arm64: mm: Temporarily disable ARM64_SW_TTBR0_PAN Will Deacon
2017-11-30 16:39 ` [PATCH v2 03/18] arm64: mm: Move ASID from TTBR0 to TTBR1 Will Deacon
2017-11-30 17:36 ` Mark Rutland
2017-11-30 16:39 ` [PATCH v2 04/18] arm64: mm: Remove pre_ttbr0_update_workaround for Falkor erratum #E1003 Will Deacon
2017-11-30 16:39 ` [PATCH v2 05/18] arm64: mm: Rename post_ttbr0_update_workaround Will Deacon
2017-11-30 16:39 ` [PATCH v2 06/18] arm64: mm: Fix and re-enable ARM64_SW_TTBR0_PAN Will Deacon
2017-12-01 11:48 ` Mark Rutland
2017-11-30 16:39 ` [PATCH v2 07/18] arm64: mm: Allocate ASIDs in pairs Will Deacon
2017-11-30 16:39 ` [PATCH v2 08/18] arm64: mm: Add arm64_kernel_unmapped_at_el0 helper Will Deacon
2017-11-30 16:39 ` [PATCH v2 09/18] arm64: mm: Invalidate both kernel and user ASIDs when performing TLBI Will Deacon
2017-11-30 16:39 ` [PATCH v2 10/18] arm64: entry: Add exception trampoline page for exceptions from EL0 Will Deacon
2017-12-01 13:31 ` Mark Rutland
2017-12-06 10:25 ` Ard Biesheuvel
2017-11-30 16:39 ` [PATCH v2 11/18] arm64: mm: Map entry trampoline into trampoline and kernel page tables Will Deacon
2017-11-30 18:29 ` Mark Rutland
2017-11-30 16:39 ` [PATCH v2 12/18] arm64: entry: Explicitly pass exception level to kernel_ventry macro Will Deacon
2017-12-01 11:58 ` Mark Rutland
2017-12-01 17:51 ` Will Deacon
2017-12-01 18:00 ` Mark Rutland
2017-11-30 16:39 ` [PATCH v2 13/18] arm64: entry: Hook up entry trampoline to exception vectors Will Deacon
2017-12-01 13:53 ` Mark Rutland
2017-12-01 17:40 ` Will Deacon
2017-11-30 16:39 ` [PATCH v2 14/18] arm64: erratum: Work around Falkor erratum #E1003 in trampoline code Will Deacon
2017-11-30 17:06 ` Robin Murphy
2017-11-30 17:19 ` Will Deacon
2017-11-30 16:39 ` [PATCH v2 15/18] arm64: tls: Avoid unconditional zeroing of tpidrro_el0 for native tasks Will Deacon
2017-11-30 16:39 ` [PATCH v2 16/18] arm64: entry: Add fake CPU feature for unmapping the kernel at EL0 Will Deacon
2017-12-01 13:55 ` Mark Rutland
2017-11-30 16:39 ` [PATCH v2 17/18] arm64: Kconfig: Add CONFIG_UNMAP_KERNEL_AT_EL0 Will Deacon
2017-12-12 8:44 ` Geert Uytterhoeven [this message]
2017-12-12 10:28 ` Will Deacon
2017-11-30 16:39 ` [PATCH v2 18/18] perf: arm_spe: Disallow userspace profiling when arm_kernel_unmapped_at_el0() Will Deacon
2017-12-01 12:15 ` Mark Rutland
2017-12-01 16:49 ` Will Deacon
2017-12-01 16:26 ` Stephen Boyd
2017-12-01 14:04 ` [PATCH v2 00/18] arm64: Unmap the kernel whilst running in userspace (KAISER) Mark Rutland
2017-12-01 17:50 ` Will Deacon
2017-12-01 17:58 ` Mark Rutland
2017-12-01 18:02 ` Dave Hansen
2017-12-01 18:14 ` Will Deacon
2017-12-11 2:24 ` Shanker Donthineni
2017-12-04 23:47 ` Laura Abbott
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