From 8ad8b72721d0f07fa02dbe71f901743f9c71c8e6 Mon Sep 17 00:00:00 2001 From: Nick Hu Date: Mon, 6 Jan 2020 10:38:32 -0800 Subject: riscv: Add KASAN support This patch ports the feature Kernel Address SANitizer (KASAN). Note: The start address of shadow memory is at the beginning of kernel space, which is 2^64 - (2^39 / 2) in SV39. The size of the kernel space is 2^38 bytes so the size of shadow memory should be 2^38 / 8. Thus, the shadow memory would not overlap with the fixmap area. There are currently two limitations in this port, 1. RV64 only: KASAN need large address space for extra shadow memory region. 2. KASAN can't debug the modules since the modules are allocated in VMALLOC area. We mapped the shadow memory, which corresponding to VMALLOC area, to the kasan_early_shadow_page because we don't have enough physical space for all the shadow memory corresponding to VMALLOC area. Signed-off-by: Nick Hu Reported-by: Greentime Hu Signed-off-by: Palmer Dabbelt --- arch/riscv/Kconfig | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/riscv/Kconfig') diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index fa7dc03459e7..d1d77c6d6721 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -66,6 +66,7 @@ config RISCV select HAVE_ARCH_MMAP_RND_BITS if MMU select ARCH_HAS_GCOV_PROFILE_ALL select HAVE_COPY_THREAD_TLS + select HAVE_ARCH_KASAN if MMU && 64BIT config ARCH_MMAP_RND_BITS_MIN default 18 if 64BIT -- cgit v1.2.3