[PATCH v4 2/7] mm: kasan: introduce generic kasan_populate_zero_shadow()
From: Aneesh Kumar K.V <hidden>
Date: 2015-08-10 06:01:34
Also in:
linux-mm, lkml
Andrey Ryabinin [off-list ref] writes:
Introduce generic kasan_populate_zero_shadow(start, end). This function maps kasan_zero_page to the [start, end] addresses. In follow on patches it will be used for ARMv8 (and maybe other architectures) and will replace x86_64 specific populate_zero_shadow(). Signed-off-by: Andrey Ryabinin <redacted>
This assume that we can have shared pgtable_t in generic code ? Is that true for generic code ? Even if it is we may want to allow some arch to override this ? On ppc64, we store the hardware hash page table slot number in pte_t, Hence we won't be able to share pgtable_t.
quoted hunk ↗ jump to hunk
--- arch/x86/mm/kasan_init_64.c | 14 ---- include/linux/kasan.h | 8 +++ mm/kasan/Makefile | 2 +- mm/kasan/kasan_init.c | 151 ++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 160 insertions(+), 15 deletions(-) create mode 100644 mm/kasan/kasan_init.cdiff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c index e1840f3..812086c 100644 --- a/arch/x86/mm/kasan_init_64.c +++ b/arch/x86/mm/kasan_init_64.c@@ -12,20 +12,6 @@ extern pgd_t early_level4_pgt[PTRS_PER_PGD]; extern struct range pfn_mapped[E820_X_MAX]; -static pud_t kasan_zero_pud[PTRS_PER_PUD] __page_aligned_bss; -static pmd_t kasan_zero_pmd[PTRS_PER_PMD] __page_aligned_bss; -static pte_t kasan_zero_pte[PTRS_PER_PTE] __page_aligned_bss; - -/*
-aneesh