1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun
3*4882a593Smuzhiyun #define DISABLE_BRANCH_PROFILING
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #include <linux/kasan.h>
6*4882a593Smuzhiyun #include <linux/memblock.h>
7*4882a593Smuzhiyun #include <linux/hugetlb.h>
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun static int __init
kasan_init_shadow_8M(unsigned long k_start,unsigned long k_end,void * block)10*4882a593Smuzhiyun kasan_init_shadow_8M(unsigned long k_start, unsigned long k_end, void *block)
11*4882a593Smuzhiyun {
12*4882a593Smuzhiyun pmd_t *pmd = pmd_off_k(k_start);
13*4882a593Smuzhiyun unsigned long k_cur, k_next;
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun for (k_cur = k_start; k_cur != k_end; k_cur = k_next, pmd += 2, block += SZ_8M) {
16*4882a593Smuzhiyun pte_basic_t *new;
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun k_next = pgd_addr_end(k_cur, k_end);
19*4882a593Smuzhiyun k_next = pgd_addr_end(k_next, k_end);
20*4882a593Smuzhiyun if ((void *)pmd_page_vaddr(*pmd) != kasan_early_shadow_pte)
21*4882a593Smuzhiyun continue;
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun new = memblock_alloc(sizeof(pte_basic_t), SZ_4K);
24*4882a593Smuzhiyun if (!new)
25*4882a593Smuzhiyun return -ENOMEM;
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun *new = pte_val(pte_mkhuge(pfn_pte(PHYS_PFN(__pa(block)), PAGE_KERNEL)));
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun hugepd_populate_kernel((hugepd_t *)pmd, (pte_t *)new, PAGE_SHIFT_8M);
30*4882a593Smuzhiyun hugepd_populate_kernel((hugepd_t *)pmd + 1, (pte_t *)new, PAGE_SHIFT_8M);
31*4882a593Smuzhiyun }
32*4882a593Smuzhiyun return 0;
33*4882a593Smuzhiyun }
34*4882a593Smuzhiyun
kasan_init_region(void * start,size_t size)35*4882a593Smuzhiyun int __init kasan_init_region(void *start, size_t size)
36*4882a593Smuzhiyun {
37*4882a593Smuzhiyun unsigned long k_start = (unsigned long)kasan_mem_to_shadow(start);
38*4882a593Smuzhiyun unsigned long k_end = (unsigned long)kasan_mem_to_shadow(start + size);
39*4882a593Smuzhiyun unsigned long k_cur;
40*4882a593Smuzhiyun int ret;
41*4882a593Smuzhiyun void *block;
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun block = memblock_alloc(k_end - k_start, SZ_8M);
44*4882a593Smuzhiyun if (!block)
45*4882a593Smuzhiyun return -ENOMEM;
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun if (IS_ALIGNED(k_start, SZ_8M)) {
48*4882a593Smuzhiyun kasan_init_shadow_8M(k_start, ALIGN_DOWN(k_end, SZ_8M), block);
49*4882a593Smuzhiyun k_cur = ALIGN_DOWN(k_end, SZ_8M);
50*4882a593Smuzhiyun if (k_cur == k_end)
51*4882a593Smuzhiyun goto finish;
52*4882a593Smuzhiyun } else {
53*4882a593Smuzhiyun k_cur = k_start;
54*4882a593Smuzhiyun }
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun ret = kasan_init_shadow_page_tables(k_start, k_end);
57*4882a593Smuzhiyun if (ret)
58*4882a593Smuzhiyun return ret;
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun for (; k_cur < k_end; k_cur += PAGE_SIZE) {
61*4882a593Smuzhiyun pmd_t *pmd = pmd_off_k(k_cur);
62*4882a593Smuzhiyun void *va = block + k_cur - k_start;
63*4882a593Smuzhiyun pte_t pte = pfn_pte(PHYS_PFN(__pa(va)), PAGE_KERNEL);
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun if (k_cur < ALIGN_DOWN(k_end, SZ_512K))
66*4882a593Smuzhiyun pte = pte_mkhuge(pte);
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun __set_pte_at(&init_mm, k_cur, pte_offset_kernel(pmd, k_cur), pte, 0);
69*4882a593Smuzhiyun }
70*4882a593Smuzhiyun finish:
71*4882a593Smuzhiyun flush_tlb_kernel_range(k_start, k_end);
72*4882a593Smuzhiyun return 0;
73*4882a593Smuzhiyun }
74