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Diffstat (limited to 'arch/arm/Kconfig')
| -rw-r--r-- | arch/arm/Kconfig | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index a750c1425c3a..345882856287 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -188,6 +188,9 @@ config ARCH_HAS_ILOG2_U64 config ARCH_HAS_BANDGAP bool +config FIX_EARLYCON_MEM + def_bool y if MMU + config GENERIC_HWEIGHT bool default y @@ -1693,6 +1696,27 @@ config HIGHMEM config HIGHPTE bool "Allocate 2nd-level pagetables from highmem" depends on HIGHMEM + help + The VM uses one page of physical memory for each page table. + For systems with a lot of processes, this can use a lot of + precious low memory, eventually leading to low memory being + consumed by page tables. Setting this option will allow + user-space 2nd level page tables to reside in high memory. + +config CPU_SW_DOMAIN_PAN + bool "Enable use of CPU domains to implement privileged no-access" + depends on MMU && !ARM_LPAE + default y + help + Increase kernel security by ensuring that normal kernel accesses + are unable to access userspace addresses. This can help prevent + use-after-free bugs becoming an exploitable privilege escalation + by ensuring that magic values (such as LIST_POISON) will always + fault when dereferenced. + + CPUs with low-vector mappings use a best-efforts implementation. + Their lower 1MB needs to remain accessible for the vectors, but + the remainder of userspace will become appropriately inaccessible. config HW_PERF_EVENTS bool "Enable hardware performance counter support for perf events" |