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| author | Mark Rutland <mark.rutland@arm.com> | 2014-06-24 16:51:37 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2014-07-10 12:36:58 +0100 |
| commit | da57a369d3bc5cd61db90f7e9555840381db9b09 (patch) | |
| tree | 6e2e032c24d4b36e792e91984191752f527baf09 /arch/arm64/Kconfig.debug | |
| parent | a2c1d73b94ed49f5fac12e95052d7b140783f800 (diff) | |
| download | lwn-da57a369d3bc5cd61db90f7e9555840381db9b09.tar.gz lwn-da57a369d3bc5cd61db90f7e9555840381db9b09.zip | |
arm64: Enable TEXT_OFFSET fuzzing
The arm64 Image header contains a text_offset field which bootloaders
are supposed to read to determine the offset (from a 2MB aligned "start
of memory" per booting.txt) at which to load the kernel. The offset is
not well respected by bootloaders at present, and due to the lack of
variation there is little incentive to support it. This is unfortunate
for the sake of future kernels where we may wish to vary the text offset
(even zeroing it).
This patch adds options to arm64 to enable fuzz-testing of text_offset.
CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET forces the text offset to a random
16-byte aligned value value in the range [0..2MB) upon a build of the
kernel. It is recommended that distribution kernels enable randomization
to test bootloaders such that any compliance issues can be fixed early.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Tom Rini <trini@ti.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/Kconfig.debug')
| -rw-r--r-- | arch/arm64/Kconfig.debug | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig.debug b/arch/arm64/Kconfig.debug index 1c1b75629842..4ee8e90b7a45 100644 --- a/arch/arm64/Kconfig.debug +++ b/arch/arm64/Kconfig.debug @@ -28,4 +28,19 @@ config PID_IN_CONTEXTIDR instructions during context switch. Say Y here only if you are planning to use hardware trace tools with this kernel. +config ARM64_RANDOMIZE_TEXT_OFFSET + bool "Randomize TEXT_OFFSET at build time" + help + Say Y here if you want the image load offset (AKA TEXT_OFFSET) + of the kernel to be randomized at build-time. When selected, + this option will cause TEXT_OFFSET to be randomized upon any + build of the kernel, and the offset will be reflected in the + text_offset field of the resulting Image. This can be used to + fuzz-test bootloaders which respect text_offset. + + This option is intended for bootloader and/or kernel testing + only. Bootloaders must make no assumptions regarding the value + of TEXT_OFFSET and platforms must not require a specific + value. + endmenu |