From: arnd@arndb•de (Arnd Bergmann)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH] ARM: ARM_KERNMEM_PERMS only works with MMU enabled
Date: Tue, 13 Jan 2015 15:14:44 +0100 [thread overview]
Message-ID: <1976703.4VfV2sWda0@wuerfel> (raw)
The recently added ARM_KERNMEM_PERMS feature works by manipulating
the kernel page tables, which obviously requires an MMU. Trying
to enable this feature when the MMU is disabled results in a lot
of compile errors in mm/init.c, so let's add a Kconfig dependency
to avoid that case.
Signed-off-by: Arnd Bergmann <arnd@arndb•de>
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index eaaf196fe4e1..0051cd924fb1 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -1010,6 +1010,7 @@ config ARCH_SUPPORTS_BIG_ENDIAN
config ARM_KERNMEM_PERMS
bool "Restrict kernel memory permissions"
+ depends on MMU
help
If this is set, kernel memory other than kernel text (and rodata)
will be made non-executable. The tradeoff is that each region is
next reply other threads:[~2015-01-13 14:14 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-13 14:14 Arnd Bergmann [this message]
2015-01-13 14:41 ` [PATCH] ARM: ARM_KERNMEM_PERMS only works with MMU enabled Kees Cook
2015-01-14 23:04 ` Laura Abbott
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