From: Felix Fu fuzhen5@huawei.com
Offering: HULK hulk inclusion category: feature bugzilla: 187985
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Kaslr will randomizes the physical address at which the kernel image is loaded, we will check and skip the memmap reserved memory, add config CONFIG_UEFI_KASLR_SKIP_MEMMAP to isolation memmap detection code.
Signed-off-by: Gaosheng Cui cuigaosheng1@huawei.com Signed-off-by: Felix Fu fuzhen5@huawei.com --- arch/arm64/Kconfig | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 2aca373a7038..c7985826c51b 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2246,6 +2246,18 @@ config RANDOMIZE_MODULE_REGION_FULL the region is exhausted. In this particular case of region exhaustion, modules might be able to fall back to a larger 2GB area.
+config UEFI_KASLR_SKIP_MEMMAP + bool "Skip the memmap address when randomize the kernel image" + depends on RANDOMIZE_BASE + default n + help + Memmap kernel parameter are described by the memmap=nn[KMG]$ss[KMG], + Region of memory to be reserved is from ss to ss+nn, the region must + be in the range of existed memory, otherwise will be ignored. Teach + KASLR to not insert the kernel in memmap defined regions. We support + up to 32 memmap regions: any additional regions will cause KASLR to + disable. + config CC_HAVE_STACKPROTECTOR_SYSREG def_bool $(cc-option,-mstack-protector-guard=sysreg -mstack-protector-guard-reg=sp_el0 -mstack-protector-guard-offset=0)