diff options
Diffstat (limited to 'mm/kasan/report_sw_tags.c')
-rw-r--r-- | mm/kasan/report_sw_tags.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/mm/kasan/report_sw_tags.c b/mm/kasan/report_sw_tags.c new file mode 100644 index 000000000..7a2639729 --- /dev/null +++ b/mm/kasan/report_sw_tags.c @@ -0,0 +1,69 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * This file contains software tag-based KASAN specific error reporting code. + * + * Copyright (c) 2014 Samsung Electronics Co., Ltd. + * Author: Andrey Ryabinin <ryabinin.a.a@gmail.com> + * + * Some code borrowed from https://github.com/xairy/kasan-prototype by + * Andrey Konovalov <andreyknvl@gmail.com> + */ + +#include <linux/bitops.h> +#include <linux/ftrace.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/printk.h> +#include <linux/sched.h> +#include <linux/sched/task_stack.h> +#include <linux/slab.h> +#include <linux/stackdepot.h> +#include <linux/stacktrace.h> +#include <linux/string.h> +#include <linux/types.h> +#include <linux/kasan.h> +#include <linux/module.h> + +#include <asm/sections.h> + +#include "kasan.h" +#include "../slab.h" + +void *kasan_find_first_bad_addr(void *addr, size_t size) +{ + u8 tag = get_tag(addr); + void *p = kasan_reset_tag(addr); + void *end = p + size; + + if (!addr_has_metadata(p)) + return p; + + while (p < end && tag == *(u8 *)kasan_mem_to_shadow(p)) + p += KASAN_GRANULE_SIZE; + + return p; +} + +void kasan_metadata_fetch_row(char *buffer, void *row) +{ + memcpy(buffer, kasan_mem_to_shadow(row), META_BYTES_PER_ROW); +} + +void kasan_print_tags(u8 addr_tag, const void *addr) +{ + u8 *shadow = (u8 *)kasan_mem_to_shadow(addr); + + pr_err("Pointer tag: [%02x], memory tag: [%02x]\n", addr_tag, *shadow); +} + +#ifdef CONFIG_KASAN_STACK +void kasan_print_address_stack_frame(const void *addr) +{ + if (WARN_ON(!object_is_on_stack(addr))) + return; + + pr_err("The buggy address belongs to stack of task %s/%d\n", + current->comm, task_pid_nr(current)); +} +#endif |