Orange Pi5 kernel

^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 generic KASAN specific error reporting 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/bitops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/ftrace.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/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/printk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/stackdepot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/stacktrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/kasan.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <asm/sections.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #include "kasan.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #include "../slab.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) void *kasan_find_first_bad_addr(void *addr, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	void *p = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	while (p < addr + size && !(*(u8 *)kasan_mem_to_shadow(p)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 		p += KASAN_GRANULE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	return p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) static const char *get_shadow_bug_type(struct kasan_access_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	const char *bug_type = "unknown-crash";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	u8 *shadow_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	shadow_addr = (u8 *)kasan_mem_to_shadow(info->first_bad_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	 * If shadow byte value is in [0, KASAN_GRANULE_SIZE) we can look
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	 * at the next shadow byte to determine the type of the bad access.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	if (*shadow_addr > 0 && *shadow_addr <= KASAN_GRANULE_SIZE - 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 		shadow_addr++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	switch (*shadow_addr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	case 0 ... KASAN_GRANULE_SIZE - 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		 * In theory it's still possible to see these shadow values
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		 * due to a data race in the kernel code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		bug_type = "out-of-bounds";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	case KASAN_PAGE_REDZONE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	case KASAN_KMALLOC_REDZONE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		bug_type = "slab-out-of-bounds";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	case KASAN_GLOBAL_REDZONE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		bug_type = "global-out-of-bounds";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	case KASAN_STACK_LEFT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	case KASAN_STACK_MID:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	case KASAN_STACK_RIGHT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	case KASAN_STACK_PARTIAL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		bug_type = "stack-out-of-bounds";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	case KASAN_FREE_PAGE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	case KASAN_KMALLOC_FREE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	case KASAN_KMALLOC_FREETRACK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		bug_type = "use-after-free";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	case KASAN_ALLOCA_LEFT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	case KASAN_ALLOCA_RIGHT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		bug_type = "alloca-out-of-bounds";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	case KASAN_VMALLOC_INVALID:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		bug_type = "vmalloc-out-of-bounds";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		break;
^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 bug_type;
^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 const char *get_wild_bug_type(struct kasan_access_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	const char *bug_type = "unknown-crash";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	if ((unsigned long)info->access_addr < PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		bug_type = "null-ptr-deref";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	else if ((unsigned long)info->access_addr < TASK_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		bug_type = "user-memory-access";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		bug_type = "wild-memory-access";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	return bug_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) const char *kasan_get_bug_type(struct kasan_access_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	 * If access_size is a negative number, then it has reason to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	 * defined as out-of-bounds bug type.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	 * Casting negative numbers to size_t would indeed turn up as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	 * a large size_t and its value will be larger than ULONG_MAX/2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	 * so that this can qualify as out-of-bounds.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	if (info->access_addr + info->access_size < info->access_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		return "out-of-bounds";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	if (addr_has_metadata(info->access_addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		return get_shadow_bug_type(info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	return get_wild_bug_type(info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) void kasan_metadata_fetch_row(char *buffer, void *row)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	memcpy(buffer, kasan_mem_to_shadow(row), META_BYTES_PER_ROW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) #ifdef CONFIG_KASAN_STACK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static bool __must_check tokenize_frame_descr(const char **frame_descr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 					      char *token, size_t max_tok_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 					      unsigned long *value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	const char *sep = strchr(*frame_descr, ' ');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	if (sep == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		sep = *frame_descr + strlen(*frame_descr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	if (token != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		const size_t tok_len = sep - *frame_descr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		if (tok_len + 1 > max_tok_len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 			pr_err("KASAN internal error: frame description too long: %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 			       *frame_descr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 			return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		/* Copy token (+ 1 byte for '\0'). */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		strscpy(token, *frame_descr, tok_len + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	/* Advance frame_descr past separator. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	*frame_descr = sep + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	if (value != NULL && kstrtoul(token, 10, value)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		pr_err("KASAN internal error: not a valid number: %s\n", token);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		return false;
^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) 	return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) static void print_decoded_frame_descr(const char *frame_descr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	 * We need to parse the following string:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	 *    "n alloc_1 alloc_2 ... alloc_n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	 * where alloc_i looks like
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	 *    "offset size len name"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	 * or "offset size len name:line".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	char token[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	unsigned long num_objects;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	if (!tokenize_frame_descr(&frame_descr, token, sizeof(token),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 				  &num_objects))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	pr_err("\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	pr_err("this frame has %lu %s:\n", num_objects,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	       num_objects == 1 ? "object" : "objects");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	while (num_objects--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		unsigned long offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		unsigned long size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		/* access offset */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		if (!tokenize_frame_descr(&frame_descr, token, sizeof(token),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 					  &offset))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		/* access size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		if (!tokenize_frame_descr(&frame_descr, token, sizeof(token),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 					  &size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		/* name length (unused) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		if (!tokenize_frame_descr(&frame_descr, NULL, 0, NULL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		/* object name */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		if (!tokenize_frame_descr(&frame_descr, token, sizeof(token),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 					  NULL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		/* Strip line number; without filename it's not very helpful. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		strreplace(token, ':', '\0');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		/* Finally, print object information. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		pr_err(" [%lu, %lu) '%s'", offset, offset + size, token);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) static bool __must_check get_address_stack_frame_info(const void *addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 						      unsigned long *offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 						      const char **frame_descr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 						      const void **frame_pc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	unsigned long aligned_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	unsigned long mem_ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	const u8 *shadow_bottom;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	const u8 *shadow_ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	const unsigned long *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	BUILD_BUG_ON(IS_ENABLED(CONFIG_STACK_GROWSUP));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	 * NOTE: We currently only support printing frame information for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	 * accesses to the task's own stack.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	if (!object_is_on_stack(addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	aligned_addr = round_down((unsigned long)addr, sizeof(long));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	mem_ptr = round_down(aligned_addr, KASAN_GRANULE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	shadow_ptr = kasan_mem_to_shadow((void *)aligned_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	shadow_bottom = kasan_mem_to_shadow(end_of_stack(current));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	while (shadow_ptr >= shadow_bottom && *shadow_ptr != KASAN_STACK_LEFT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 		shadow_ptr--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		mem_ptr -= KASAN_GRANULE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	while (shadow_ptr >= shadow_bottom && *shadow_ptr == KASAN_STACK_LEFT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		shadow_ptr--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		mem_ptr -= KASAN_GRANULE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	if (shadow_ptr < shadow_bottom)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	frame = (const unsigned long *)(mem_ptr + KASAN_GRANULE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	if (frame[0] != KASAN_CURRENT_STACK_FRAME_MAGIC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		pr_err("KASAN internal error: frame info validation failed; invalid marker: %lu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		       frame[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	*offset = (unsigned long)addr - (unsigned long)frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	*frame_descr = (const char *)frame[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	*frame_pc = (void *)frame[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) void kasan_print_address_stack_frame(const void *addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	unsigned long offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	const char *frame_descr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	const void *frame_pc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	if (!get_address_stack_frame_info(addr, &offset, &frame_descr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 					  &frame_pc))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	 * get_address_stack_frame_info only returns true if the given addr is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	 * on the current task's stack.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	pr_err("\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	pr_err("addr %px is located in stack of task %s/%d at offset %lu in frame:\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	       addr, current->comm, task_pid_nr(current), offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	pr_err(" %pS\n", frame_pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	if (!frame_descr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	print_decoded_frame_descr(frame_descr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) #endif /* CONFIG_KASAN_STACK */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) #define DEFINE_ASAN_REPORT_LOAD(size)                     \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) void __asan_report_load##size##_noabort(unsigned long addr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) {                                                         \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	kasan_report(addr, size, false, _RET_IP_);	  \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) }                                                         \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) EXPORT_SYMBOL(__asan_report_load##size##_noabort)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) #define DEFINE_ASAN_REPORT_STORE(size)                     \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) void __asan_report_store##size##_noabort(unsigned long addr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) {                                                          \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	kasan_report(addr, size, true, _RET_IP_);	   \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) }                                                          \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) EXPORT_SYMBOL(__asan_report_store##size##_noabort)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) DEFINE_ASAN_REPORT_LOAD(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) DEFINE_ASAN_REPORT_LOAD(2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) DEFINE_ASAN_REPORT_LOAD(4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) DEFINE_ASAN_REPORT_LOAD(8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) DEFINE_ASAN_REPORT_LOAD(16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) DEFINE_ASAN_REPORT_STORE(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) DEFINE_ASAN_REPORT_STORE(2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) DEFINE_ASAN_REPORT_STORE(4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) DEFINE_ASAN_REPORT_STORE(8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) DEFINE_ASAN_REPORT_STORE(16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) void __asan_report_load_n_noabort(unsigned long addr, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	kasan_report(addr, size, false, _RET_IP_);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) EXPORT_SYMBOL(__asan_report_load_n_noabort);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) void __asan_report_store_n_noabort(unsigned long addr, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	kasan_report(addr, size, true, _RET_IP_);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) EXPORT_SYMBOL(__asan_report_store_n_noabort);