diff options
Diffstat (limited to '')
| -rw-r--r-- | arch/powerpc/mm/kasan/kasan_init_32.c | 192 |
1 files changed, 0 insertions, 192 deletions
diff --git a/arch/powerpc/mm/kasan/kasan_init_32.c b/arch/powerpc/mm/kasan/kasan_init_32.c deleted file mode 100644 index cf8770b1a692..000000000000 --- a/arch/powerpc/mm/kasan/kasan_init_32.c +++ /dev/null @@ -1,192 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 - -#define DISABLE_BRANCH_PROFILING - -#include <linux/kasan.h> -#include <linux/printk.h> -#include <linux/memblock.h> -#include <linux/sched/task.h> -#include <asm/pgalloc.h> -#include <asm/code-patching.h> -#include <mm/mmu_decl.h> - -static pgprot_t __init kasan_prot_ro(void) -{ - if (early_mmu_has_feature(MMU_FTR_HPTE_TABLE)) - return PAGE_READONLY; - - return PAGE_KERNEL_RO; -} - -static void __init kasan_populate_pte(pte_t *ptep, pgprot_t prot) -{ - unsigned long va = (unsigned long)kasan_early_shadow_page; - phys_addr_t pa = __pa(kasan_early_shadow_page); - int i; - - for (i = 0; i < PTRS_PER_PTE; i++, ptep++) - __set_pte_at(&init_mm, va, ptep, pfn_pte(PHYS_PFN(pa), prot), 0); -} - -int __init kasan_init_shadow_page_tables(unsigned long k_start, unsigned long k_end) -{ - pmd_t *pmd; - unsigned long k_cur, k_next; - - pmd = pmd_off_k(k_start); - - for (k_cur = k_start; k_cur != k_end; k_cur = k_next, pmd++) { - pte_t *new; - - k_next = pgd_addr_end(k_cur, k_end); - if ((void *)pmd_page_vaddr(*pmd) != kasan_early_shadow_pte) - continue; - - new = memblock_alloc(PTE_FRAG_SIZE, PTE_FRAG_SIZE); - - if (!new) - return -ENOMEM; - kasan_populate_pte(new, PAGE_KERNEL); - pmd_populate_kernel(&init_mm, pmd, new); - } - return 0; -} - -int __init __weak kasan_init_region(void *start, size_t size) -{ - unsigned long k_start = (unsigned long)kasan_mem_to_shadow(start); - unsigned long k_end = (unsigned long)kasan_mem_to_shadow(start + size); - unsigned long k_cur; - int ret; - void *block; - - ret = kasan_init_shadow_page_tables(k_start, k_end); - if (ret) - return ret; - - block = memblock_alloc(k_end - k_start, PAGE_SIZE); - if (!block) - return -ENOMEM; - - for (k_cur = k_start & PAGE_MASK; k_cur < k_end; k_cur += PAGE_SIZE) { - pmd_t *pmd = pmd_off_k(k_cur); - void *va = block + k_cur - k_start; - pte_t pte = pfn_pte(PHYS_PFN(__pa(va)), PAGE_KERNEL); - - __set_pte_at(&init_mm, k_cur, pte_offset_kernel(pmd, k_cur), pte, 0); - } - flush_tlb_kernel_range(k_start, k_end); - return 0; -} - -void __init -kasan_update_early_region(unsigned long k_start, unsigned long k_end, pte_t pte) -{ - unsigned long k_cur; - phys_addr_t pa = __pa(kasan_early_shadow_page); - - for (k_cur = k_start; k_cur != k_end; k_cur += PAGE_SIZE) { - pmd_t *pmd = pmd_off_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, pte, 0); - } - - 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); - - kasan_update_early_region(k_start, k_end, __pte(0)); - -#ifdef MODULES_VADDR - k_start = (unsigned long)kasan_mem_to_shadow((void *)MODULES_VADDR); - k_end = (unsigned long)kasan_mem_to_shadow((void *)MODULES_END); - kasan_update_early_region(k_start, k_end, __pte(0)); -#endif -} - -void __init kasan_mmu_init(void) -{ - int ret; - - if (early_mmu_has_feature(MMU_FTR_HPTE_TABLE)) { - ret = kasan_init_shadow_page_tables(KASAN_SHADOW_START, KASAN_SHADOW_END); - - if (ret) - panic("kasan: kasan_init_shadow_page_tables() failed"); - } -} - -void __init kasan_init(void) -{ - phys_addr_t base, end; - u64 i; - int ret; - - for_each_mem_range(i, &base, &end) { - phys_addr_t top = min(end, total_lowmem); - - if (base >= top) - continue; - - ret = kasan_init_region(__va(base), top - base); - if (ret) - panic("kasan: kasan_init_region() failed"); - } - - if (IS_ENABLED(CONFIG_KASAN_VMALLOC)) { - ret = kasan_init_shadow_page_tables(KASAN_SHADOW_START, KASAN_SHADOW_END); - - if (ret) - panic("kasan: kasan_init_shadow_page_tables() failed"); - } - - kasan_remap_early_shadow_ro(); - - clear_page(kasan_early_shadow_page); - - /* At this point kasan is fully initialized. Enable error messages */ - init_task.kasan_depth = 0; - pr_info("KASAN init done\n"); -} - -void __init kasan_late_init(void) -{ - if (IS_ENABLED(CONFIG_KASAN_VMALLOC)) - kasan_unmap_early_shadow_vmalloc(); -} - -void __init kasan_early_init(void) -{ - unsigned long addr = KASAN_SHADOW_START; - unsigned long end = KASAN_SHADOW_END; - unsigned long next; - pmd_t *pmd = pmd_off_k(addr); - - BUILD_BUG_ON(KASAN_SHADOW_START & ~PGDIR_MASK); - - kasan_populate_pte(kasan_early_shadow_pte, PAGE_KERNEL); - - do { - next = pgd_addr_end(addr, end); - pmd_populate_kernel(&init_mm, pmd, kasan_early_shadow_pte); - } while (pmd++, addr = next, addr != end); -} |