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powerpc/kasan: Refactor update of early shadow mappings

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kasan_remap_early_shadow_ro() and kasan_unmap_early_shadow_vmalloc()
are both updating the early shadow mapping: the first one sets
the mapping read-only while the other clears the mapping.

Refactor and create kasan_update_early_region()

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/8c496c0828de2608c7c940c45525d177e91b6f1b.1589866984.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2020-05-19 05:48:47 +00:00 committed by Michael Ellerman
parent 7c31c05e00
commit 7dec42ab57
1 changed files with 18 additions and 21 deletions
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39
arch/powerpc/mm/kasan/kasan_init_32.c
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@ -79,45 +79,42 @@ static int __init kasan_init_region(void *start, size_t size)
return 0;
}
static void __init kasan_remap_early_shadow_ro(void)
static void __init
kasan_update_early_region(unsigned long k_start, unsigned long k_end, pte_t pte)
{
pgprot_t prot = kasan_prot_ro();
unsigned long k_start = KASAN_SHADOW_START;
unsigned long k_end = KASAN_SHADOW_END;
unsigned long k_cur;
phys_addr_t pa = __pa(kasan_early_shadow_page);
kasan_populate_pte(kasan_early_shadow_pte, prot);
for (k_cur = k_start & PAGE_MASK; k_cur != k_end; k_cur += PAGE_SIZE) {
for (k_cur = k_start; k_cur != k_end; k_cur += PAGE_SIZE) {
pmd_t *pmd = pmd_ptr_k(k_cur);
pte_t *ptep = pte_offset_kernel(pmd, k_cur);
if ((pte_val(*ptep) & PTE_RPN_MASK) != pa)
continue;
__set_pte_at(&init_mm, k_cur, ptep, pfn_pte(PHYS_PFN(pa), prot), 0);
__set_pte_at(&init_mm, k_cur, ptep, pte, 0);
}
flush_tlb_kernel_range(KASAN_SHADOW_START, KASAN_SHADOW_END);
flush_tlb_kernel_range(k_start, k_end);
}
static void __init kasan_remap_early_shadow_ro(void)
{
pgprot_t prot = kasan_prot_ro();
phys_addr_t pa = __pa(kasan_early_shadow_page);
kasan_populate_pte(kasan_early_shadow_pte, prot);
kasan_update_early_region(KASAN_SHADOW_START, KASAN_SHADOW_END,
pfn_pte(PHYS_PFN(pa), prot));
}
static void __init kasan_unmap_early_shadow_vmalloc(void)
{
unsigned long k_start = (unsigned long)kasan_mem_to_shadow((void *)VMALLOC_START);
unsigned long k_end = (unsigned long)kasan_mem_to_shadow((void *)VMALLOC_END);
unsigned long k_cur;
phys_addr_t pa = __pa(kasan_early_shadow_page);
for (k_cur = k_start & PAGE_MASK; k_cur < k_end; k_cur += PAGE_SIZE) {
pmd_t *pmd = pmd_offset(pud_offset(pgd_offset_k(k_cur), k_cur), k_cur);
pte_t *ptep = pte_offset_kernel(pmd, k_cur);
if ((pte_val(*ptep) & PTE_RPN_MASK) != pa)
continue;
__set_pte_at(&init_mm, k_cur, ptep, __pte(0), 0);
}
flush_tlb_kernel_range(k_start, k_end);
kasan_update_early_region(k_start, k_end, __pte(0));
}
static void __init kasan_mmu_init(void)