^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #include <linux/pagewalk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) #include <linux/ptdump.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <linux/kasan.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * This is an optimization for KASAN=y case. Since all kasan page tables
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * eventually point to the kasan_early_shadow_page we could call note_page()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * right away without walking through lower level page tables. This saves
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * us dozens of seconds (minutes for 5-level config) while checking for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * W+X mapping or reading kernel_page_tables debugfs file.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) static inline int note_kasan_page_table(struct mm_walk *walk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) struct ptdump_state *st = walk->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) st->note_page(st, addr, 4, pte_val(kasan_early_shadow_pte[0]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) walk->action = ACTION_CONTINUE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) static int ptdump_pgd_entry(pgd_t *pgd, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) unsigned long next, struct mm_walk *walk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct ptdump_state *st = walk->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) pgd_t val = READ_ONCE(*pgd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #if CONFIG_PGTABLE_LEVELS > 4 && \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) if (pgd_page(val) == virt_to_page(lm_alias(kasan_early_shadow_p4d)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) return note_kasan_page_table(walk, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) if (st->effective_prot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) st->effective_prot(st, 0, pgd_val(val));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) if (pgd_leaf(val))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) st->note_page(st, addr, 0, pgd_val(val));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) static int ptdump_p4d_entry(p4d_t *p4d, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) unsigned long next, struct mm_walk *walk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) struct ptdump_state *st = walk->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) p4d_t val = READ_ONCE(*p4d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) #if CONFIG_PGTABLE_LEVELS > 3 && \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) if (p4d_page(val) == virt_to_page(lm_alias(kasan_early_shadow_pud)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) return note_kasan_page_table(walk, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) if (st->effective_prot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) st->effective_prot(st, 1, p4d_val(val));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) if (p4d_leaf(val))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) st->note_page(st, addr, 1, p4d_val(val));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) static int ptdump_pud_entry(pud_t *pud, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) unsigned long next, struct mm_walk *walk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct ptdump_state *st = walk->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) pud_t val = READ_ONCE(*pud);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) #if CONFIG_PGTABLE_LEVELS > 2 && \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) if (pud_page(val) == virt_to_page(lm_alias(kasan_early_shadow_pmd)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) return note_kasan_page_table(walk, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) if (st->effective_prot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) st->effective_prot(st, 2, pud_val(val));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if (pud_leaf(val))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) st->note_page(st, addr, 2, pud_val(val));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) static int ptdump_pmd_entry(pmd_t *pmd, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) unsigned long next, struct mm_walk *walk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) struct ptdump_state *st = walk->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) pmd_t val = READ_ONCE(*pmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) if (pmd_page(val) == virt_to_page(lm_alias(kasan_early_shadow_pte)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) return note_kasan_page_table(walk, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (st->effective_prot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) st->effective_prot(st, 3, pmd_val(val));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) if (pmd_leaf(val))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) st->note_page(st, addr, 3, pmd_val(val));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static int ptdump_pte_entry(pte_t *pte, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) unsigned long next, struct mm_walk *walk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) struct ptdump_state *st = walk->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) pte_t val = ptep_get(pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (st->effective_prot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) st->effective_prot(st, 4, pte_val(val));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) st->note_page(st, addr, 4, pte_val(val));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static int ptdump_hole(unsigned long addr, unsigned long next,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) int depth, struct mm_walk *walk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) struct ptdump_state *st = walk->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) st->note_page(st, addr, depth, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) static const struct mm_walk_ops ptdump_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) .pgd_entry = ptdump_pgd_entry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) .p4d_entry = ptdump_p4d_entry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) .pud_entry = ptdump_pud_entry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) .pmd_entry = ptdump_pmd_entry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) .pte_entry = ptdump_pte_entry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) .pte_hole = ptdump_hole,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) void ptdump_walk_pgd(struct ptdump_state *st, struct mm_struct *mm, pgd_t *pgd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) const struct ptdump_range *range = st->range;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) mmap_read_lock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) while (range->start != range->end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) walk_page_range_novma(mm, range->start, range->end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) &ptdump_ops, pgd, st);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) range++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) mmap_read_unlock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) /* Flush out the last page */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) st->note_page(st, 0, -1, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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