Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Christophe Leroy | 403 | 54.83% | 4 | 57.14% |
Daniel Axtens | 294 | 40.00% | 1 | 14.29% |
Rashmica Gupta | 32 | 4.35% | 1 | 14.29% |
Benjamin Gray | 6 | 0.82% | 1 | 14.29% |
Total | 735 | 7 |
// SPDX-License-Identifier: GPL-2.0 /* * KASAN for 64-bit Book3e powerpc * * Copyright 2022, Christophe Leroy, CS GROUP France */ #define DISABLE_BRANCH_PROFILING #include <linux/kasan.h> #include <linux/printk.h> #include <linux/memblock.h> #include <linux/set_memory.h> #include <asm/pgalloc.h> static inline bool kasan_pud_table(p4d_t p4d) { return p4d_page(p4d) == virt_to_page(lm_alias(kasan_early_shadow_pud)); } static inline bool kasan_pmd_table(pud_t pud) { return pud_page(pud) == virt_to_page(lm_alias(kasan_early_shadow_pmd)); } static inline bool kasan_pte_table(pmd_t pmd) { return pmd_page(pmd) == virt_to_page(lm_alias(kasan_early_shadow_pte)); } static int __init kasan_map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot) { pgd_t *pgdp; p4d_t *p4dp; pud_t *pudp; pmd_t *pmdp; pte_t *ptep; pgdp = pgd_offset_k(ea); p4dp = p4d_offset(pgdp, ea); if (kasan_pud_table(*p4dp)) { pudp = memblock_alloc(PUD_TABLE_SIZE, PUD_TABLE_SIZE); memcpy(pudp, kasan_early_shadow_pud, PUD_TABLE_SIZE); p4d_populate(&init_mm, p4dp, pudp); } pudp = pud_offset(p4dp, ea); if (kasan_pmd_table(*pudp)) { pmdp = memblock_alloc(PMD_TABLE_SIZE, PMD_TABLE_SIZE); memcpy(pmdp, kasan_early_shadow_pmd, PMD_TABLE_SIZE); pud_populate(&init_mm, pudp, pmdp); } pmdp = pmd_offset(pudp, ea); if (kasan_pte_table(*pmdp)) { ptep = memblock_alloc(PTE_TABLE_SIZE, PTE_TABLE_SIZE); memcpy(ptep, kasan_early_shadow_pte, PTE_TABLE_SIZE); pmd_populate_kernel(&init_mm, pmdp, ptep); } ptep = pte_offset_kernel(pmdp, ea); __set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT, prot), 0); return 0; } static void __init kasan_init_phys_region(void *start, void *end) { unsigned long k_start, k_end, k_cur; void *va; if (start >= end) return; k_start = ALIGN_DOWN((unsigned long)kasan_mem_to_shadow(start), PAGE_SIZE); k_end = ALIGN((unsigned long)kasan_mem_to_shadow(end), PAGE_SIZE); va = memblock_alloc(k_end - k_start, PAGE_SIZE); for (k_cur = k_start; k_cur < k_end; k_cur += PAGE_SIZE, va += PAGE_SIZE) kasan_map_kernel_page(k_cur, __pa(va), PAGE_KERNEL); } void __init kasan_early_init(void) { int i; unsigned long addr; pgd_t *pgd = pgd_offset_k(KASAN_SHADOW_START); pte_t zero_pte = pfn_pte(virt_to_pfn(kasan_early_shadow_page), PAGE_KERNEL); BUILD_BUG_ON(!IS_ALIGNED(KASAN_SHADOW_START, PGDIR_SIZE)); BUILD_BUG_ON(!IS_ALIGNED(KASAN_SHADOW_END, PGDIR_SIZE)); for (i = 0; i < PTRS_PER_PTE; i++) __set_pte_at(&init_mm, (unsigned long)kasan_early_shadow_page, &kasan_early_shadow_pte[i], zero_pte, 0); for (i = 0; i < PTRS_PER_PMD; i++) pmd_populate_kernel(&init_mm, &kasan_early_shadow_pmd[i], kasan_early_shadow_pte); for (i = 0; i < PTRS_PER_PUD; i++) pud_populate(&init_mm, &kasan_early_shadow_pud[i], kasan_early_shadow_pmd); for (addr = KASAN_SHADOW_START; addr != KASAN_SHADOW_END; addr += PGDIR_SIZE) p4d_populate(&init_mm, p4d_offset(pgd++, addr), kasan_early_shadow_pud); } void __init kasan_init(void) { phys_addr_t start, end; u64 i; pte_t zero_pte = pfn_pte(virt_to_pfn(kasan_early_shadow_page), PAGE_KERNEL_RO); for_each_mem_range(i, &start, &end) kasan_init_phys_region(phys_to_virt(start), phys_to_virt(end)); if (IS_ENABLED(CONFIG_KASAN_VMALLOC)) kasan_remove_zero_shadow((void *)VMALLOC_START, VMALLOC_SIZE); for (i = 0; i < PTRS_PER_PTE; i++) __set_pte_at(&init_mm, (unsigned long)kasan_early_shadow_page, &kasan_early_shadow_pte[i], zero_pte, 0); flush_tlb_kernel_range(KASAN_SHADOW_START, KASAN_SHADOW_END); memset(kasan_early_shadow_page, 0, PAGE_SIZE); /* Enable error messages */ init_task.kasan_depth = 0; pr_info("KASAN init done\n"); } void __init kasan_late_init(void) { }
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