^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) * This file contains core generic KASAN code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2014 Samsung Electronics Co., Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Author: Andrey Ryabinin <ryabinin.a.a@gmail.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Some code borrowed from https://github.com/xairy/kasan-prototype by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Andrey Konovalov <andreyknvl@gmail.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/kasan.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/kfence.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/kmemleak.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/linkage.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/memory.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/printk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/stacktrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/bug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include "kasan.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include "../slab.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * All functions below always inlined so compiler could
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * perform better optimizations in each of __asan_loadX/__assn_storeX
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * depending on memory access size X.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static __always_inline bool memory_is_poisoned_1(unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) s8 shadow_value = *(s8 *)kasan_mem_to_shadow((void *)addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) if (unlikely(shadow_value)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) s8 last_accessible_byte = addr & KASAN_GRANULE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) return unlikely(last_accessible_byte >= shadow_value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) static __always_inline bool memory_is_poisoned_2_4_8(unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) u8 *shadow_addr = (u8 *)kasan_mem_to_shadow((void *)addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * Access crosses 8(shadow size)-byte boundary. Such access maps
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * into 2 shadow bytes, so we need to check them both.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) if (unlikely(((addr + size - 1) & KASAN_GRANULE_MASK) < size - 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) return *shadow_addr || memory_is_poisoned_1(addr + size - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) return memory_is_poisoned_1(addr + size - 1);
^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 __always_inline bool memory_is_poisoned_16(unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) u16 *shadow_addr = (u16 *)kasan_mem_to_shadow((void *)addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) /* Unaligned 16-bytes access maps into 3 shadow bytes. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) if (unlikely(!IS_ALIGNED(addr, KASAN_GRANULE_SIZE)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) return *shadow_addr || memory_is_poisoned_1(addr + 15);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return *shadow_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) static __always_inline unsigned long bytes_is_nonzero(const u8 *start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) while (size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if (unlikely(*start))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return (unsigned long)start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) start++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) size--;
^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) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) static __always_inline unsigned long memory_is_nonzero(const void *start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) const void *end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) unsigned int words;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) unsigned long ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) unsigned int prefix = (unsigned long)start % 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) if (end - start <= 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) return bytes_is_nonzero(start, end - start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) if (prefix) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) prefix = 8 - prefix;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) ret = bytes_is_nonzero(start, prefix);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) if (unlikely(ret))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) start += prefix;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) words = (end - start) / 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) while (words) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (unlikely(*(u64 *)start))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) return bytes_is_nonzero(start, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) start += 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) words--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) return bytes_is_nonzero(start, (end - start) % 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) static __always_inline bool memory_is_poisoned_n(unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) unsigned long ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) ret = memory_is_nonzero(kasan_mem_to_shadow((void *)addr),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) kasan_mem_to_shadow((void *)addr + size - 1) + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (unlikely(ret)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) unsigned long last_byte = addr + size - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) s8 *last_shadow = (s8 *)kasan_mem_to_shadow((void *)last_byte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) if (unlikely(ret != (unsigned long)last_shadow ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) ((long)(last_byte & KASAN_GRANULE_MASK) >= *last_shadow)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) static __always_inline bool memory_is_poisoned(unsigned long addr, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) if (__builtin_constant_p(size)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) switch (size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) return memory_is_poisoned_1(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) case 4:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) case 8:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) return memory_is_poisoned_2_4_8(addr, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) case 16:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) return memory_is_poisoned_16(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) BUILD_BUG();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) return memory_is_poisoned_n(addr, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) static __always_inline bool check_region_inline(unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) size_t size, bool write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) unsigned long ret_ip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (unlikely(size == 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) if (unlikely(addr + size < addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) return !kasan_report(addr, size, write, ret_ip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) if (unlikely((void *)addr <
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) kasan_shadow_to_mem((void *)KASAN_SHADOW_START))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) return !kasan_report(addr, size, write, ret_ip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) if (likely(!memory_is_poisoned(addr, size)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) return !kasan_report(addr, size, write, ret_ip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) bool kasan_check_range(unsigned long addr, size_t size, bool write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) unsigned long ret_ip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) return check_region_inline(addr, size, write, ret_ip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) bool kasan_byte_accessible(const void *addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) s8 shadow_byte = READ_ONCE(*(s8 *)kasan_mem_to_shadow(addr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) return shadow_byte >= 0 && shadow_byte < KASAN_GRANULE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) void kasan_cache_shrink(struct kmem_cache *cache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) kasan_quarantine_remove_cache(cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) void kasan_cache_shutdown(struct kmem_cache *cache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) if (!__kmem_cache_empty(cache))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) kasan_quarantine_remove_cache(cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) static void register_global(struct kasan_global *global)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) size_t aligned_size = round_up(global->size, KASAN_GRANULE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) kasan_unpoison(global->beg, global->size, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) kasan_poison(global->beg + aligned_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) global->size_with_redzone - aligned_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) KASAN_GLOBAL_REDZONE, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) void __asan_register_globals(struct kasan_global *globals, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) for (i = 0; i < size; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) register_global(&globals[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) EXPORT_SYMBOL(__asan_register_globals);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) void __asan_unregister_globals(struct kasan_global *globals, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) EXPORT_SYMBOL(__asan_unregister_globals);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) #define DEFINE_ASAN_LOAD_STORE(size) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) void __asan_load##size(unsigned long addr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) check_region_inline(addr, size, false, _RET_IP_); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) EXPORT_SYMBOL(__asan_load##size); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) __alias(__asan_load##size) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) void __asan_load##size##_noabort(unsigned long); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) EXPORT_SYMBOL(__asan_load##size##_noabort); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) void __asan_store##size(unsigned long addr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) check_region_inline(addr, size, true, _RET_IP_); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) EXPORT_SYMBOL(__asan_store##size); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) __alias(__asan_store##size) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) void __asan_store##size##_noabort(unsigned long); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) EXPORT_SYMBOL(__asan_store##size##_noabort)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) DEFINE_ASAN_LOAD_STORE(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) DEFINE_ASAN_LOAD_STORE(2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) DEFINE_ASAN_LOAD_STORE(4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) DEFINE_ASAN_LOAD_STORE(8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) DEFINE_ASAN_LOAD_STORE(16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) void __asan_loadN(unsigned long addr, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) kasan_check_range(addr, size, false, _RET_IP_);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) EXPORT_SYMBOL(__asan_loadN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) __alias(__asan_loadN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) void __asan_loadN_noabort(unsigned long, size_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) EXPORT_SYMBOL(__asan_loadN_noabort);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) void __asan_storeN(unsigned long addr, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) kasan_check_range(addr, size, true, _RET_IP_);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) EXPORT_SYMBOL(__asan_storeN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) __alias(__asan_storeN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) void __asan_storeN_noabort(unsigned long, size_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) EXPORT_SYMBOL(__asan_storeN_noabort);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) /* to shut up compiler complaints */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) void __asan_handle_no_return(void) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) EXPORT_SYMBOL(__asan_handle_no_return);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) /* Emitted by compiler to poison alloca()ed objects. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) void __asan_alloca_poison(unsigned long addr, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) size_t rounded_up_size = round_up(size, KASAN_GRANULE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) size_t padding_size = round_up(size, KASAN_ALLOCA_REDZONE_SIZE) -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) rounded_up_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) size_t rounded_down_size = round_down(size, KASAN_GRANULE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) const void *left_redzone = (const void *)(addr -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) KASAN_ALLOCA_REDZONE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) const void *right_redzone = (const void *)(addr + rounded_up_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) WARN_ON(!IS_ALIGNED(addr, KASAN_ALLOCA_REDZONE_SIZE));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) kasan_unpoison((const void *)(addr + rounded_down_size),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) size - rounded_down_size, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) kasan_poison(left_redzone, KASAN_ALLOCA_REDZONE_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) KASAN_ALLOCA_LEFT, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) kasan_poison(right_redzone, padding_size + KASAN_ALLOCA_REDZONE_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) KASAN_ALLOCA_RIGHT, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) EXPORT_SYMBOL(__asan_alloca_poison);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) /* Emitted by compiler to unpoison alloca()ed areas when the stack unwinds. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) void __asan_allocas_unpoison(const void *stack_top, const void *stack_bottom)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) if (unlikely(!stack_top || stack_top > stack_bottom))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) kasan_unpoison(stack_top, stack_bottom - stack_top, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) EXPORT_SYMBOL(__asan_allocas_unpoison);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) /* Emitted by the compiler to [un]poison local variables. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) #define DEFINE_ASAN_SET_SHADOW(byte) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) void __asan_set_shadow_##byte(const void *addr, size_t size) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) __memset((void *)addr, 0x##byte, size); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) EXPORT_SYMBOL(__asan_set_shadow_##byte)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) DEFINE_ASAN_SET_SHADOW(00);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) DEFINE_ASAN_SET_SHADOW(f1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) DEFINE_ASAN_SET_SHADOW(f2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) DEFINE_ASAN_SET_SHADOW(f3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) DEFINE_ASAN_SET_SHADOW(f5);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) DEFINE_ASAN_SET_SHADOW(f8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) void kasan_record_aux_stack(void *addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) struct page *page = kasan_addr_to_page(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) struct kmem_cache *cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) struct kasan_alloc_meta *alloc_meta;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) void *object;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) if (is_kfence_address(addr) || !(page && PageSlab(page)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) cache = page->slab_cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) object = nearest_obj(cache, page, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) alloc_meta = kasan_get_alloc_meta(cache, object);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) if (!alloc_meta)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) alloc_meta->aux_stack[1] = alloc_meta->aux_stack[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) alloc_meta->aux_stack[0] = kasan_save_stack(GFP_NOWAIT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) void kasan_set_free_info(struct kmem_cache *cache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) void *object, u8 tag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) struct kasan_free_meta *free_meta;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) free_meta = kasan_get_free_meta(cache, object);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) if (!free_meta)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) kasan_set_track(&free_meta->free_track, GFP_NOWAIT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) /* The object was freed and has free track set. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) *(u8 *)kasan_mem_to_shadow(object) = KASAN_KMALLOC_FREETRACK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) struct kasan_track *kasan_get_free_track(struct kmem_cache *cache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) void *object, u8 tag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) if (*(u8 *)kasan_mem_to_shadow(object) != KASAN_KMALLOC_FREETRACK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) /* Free meta must be present with KASAN_KMALLOC_FREETRACK. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) return &kasan_get_free_meta(cache, object)->free_track;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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