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| author | Nick Hu <nickhu@andestech.com> | 2020-01-06 19:38:32 +0100 |
|---|---|---|
| committer | Palmer Dabbelt <palmerdabbelt@google.com> | 2020-01-22 22:09:58 +0100 |
| commit | 8ad8b72721d0f07fa02dbe71f901743f9c71c8e6 (patch) | |
| tree | f7e4dfb5c72ced986c1183e9d0c830de608ea2fc /arch/riscv/include/asm/pgtable-64.h | |
| parent | kasan: No KASAN's memmove check if archs don't have it. (diff) | |
| download | linux-8ad8b72721d0f07fa02dbe71f901743f9c71c8e6.tar.xz linux-8ad8b72721d0f07fa02dbe71f901743f9c71c8e6.zip | |
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/include/asm/pgtable-64.h')
| -rw-r--r-- | arch/riscv/include/asm/pgtable-64.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/pgtable-64.h b/arch/riscv/include/asm/pgtable-64.h index 74630989006d..36e638d1dfe4 100644 --- a/arch/riscv/include/asm/pgtable-64.h +++ b/arch/riscv/include/asm/pgtable-64.h @@ -58,6 +58,11 @@ static inline unsigned long pud_page_vaddr(pud_t pud) return (unsigned long)pfn_to_virt(pud_val(pud) >> _PAGE_PFN_SHIFT); } +static inline struct page *pud_page(pud_t pud) +{ + return pfn_to_page(pud_val(pud) >> _PAGE_PFN_SHIFT); +} + #define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)) static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr) |