[PATCH v2 17/18] arm64: Kconfig: Add CONFIG_UNMAP_KERNEL_AT_EL0
From: geert@linux-m68k.org (Geert Uytterhoeven)
Date: 2017-12-12 08:44:14
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Hi Will, On Thu, Nov 30, 2017 at 5:39 PM, Will Deacon [off-list ref] 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 <redacted>
This is now commit 084eb77cd3a81134 in arm64/for-next/core.
quoted hunk ↗ jump to hunk
--- 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 at 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