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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2014-12-05 16:30:54 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2014-12-05 16:30:54 +0000 |
| commit | e9f2d6d66037cdf97487491e04053f411abc5d16 (patch) | |
| tree | 123cec080d17fb74a2531d8cc7ad1cf44bbad9ec /arch/arm/mm/Kconfig | |
| parent | fbe4dd088f449cbae586aa8af51d271297c75f9f (diff) | |
| parent | 06e944b8e5fc4bec83f102f98c1ee4f972f5f072 (diff) | |
Merge branch 'devel-stable' into for-next
Diffstat (limited to 'arch/arm/mm/Kconfig')
| -rw-r--r-- | arch/arm/mm/Kconfig | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index 7eb94e6fc376..bc219b303bc7 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -1009,3 +1009,24 @@ config ARCH_SUPPORTS_BIG_ENDIAN help This option specifies the architecture can support big endian operation. + +config ARM_KERNMEM_PERMS + bool "Restrict kernel memory permissions" + 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 + padded to section-size (1MiB) boundaries (because their permissions + are different and splitting the 1M pages into 4K ones causes TLB + performance problems), wasting memory. + +config DEBUG_RODATA + bool "Make kernel text and rodata read-only" + depends on ARM_KERNMEM_PERMS + default y + help + If this is set, kernel text and rodata will be made read-only. This + is to help catch accidental or malicious attempts to change the + kernel's executable code. Additionally splits rodata from kernel + text so it can be made explicitly non-executable. This creates + another section-size padded region, so it can waste more memory + space while gaining the read-only protections. |