diff options
| author | Nick Hu <nickhu@andestech.com> | 2020-01-06 10:38:32 -0800 |
|---|---|---|
| committer | Palmer Dabbelt <palmerdabbelt@google.com> | 2020-01-22 13:09:58 -0800 |
| commit | 8ad8b72721d0f07fa02dbe71f901743f9c71c8e6 (patch) | |
| tree | f7e4dfb5c72ced986c1183e9d0c830de608ea2fc /arch/riscv/Kconfig | |
| parent | 57ee58e39321ab4ac3f2949b90117786726cb216 (diff) | |
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 <nickhu@andestech.com>
Reported-by: Greentime Hu <green.hu@gmail.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Diffstat (limited to 'arch/riscv/Kconfig')
| -rw-r--r-- | arch/riscv/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
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 |