507 lines
9.8 KiB
C
507 lines
9.8 KiB
C
/*
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*
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* Copyright (c) 2014 Samsung Electronics Co., Ltd.
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* Author: Andrey Ryabinin <a.ryabinin@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#define pr_fmt(fmt) "kasan test: %s " fmt, __func__
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#include <linux/delay.h>
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#include <linux/kernel.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/printk.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/uaccess.h>
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#include <linux/module.h>
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/*
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* Note: test functions are marked noinline so that their names appear in
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* reports.
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*/
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static noinline void __init kmalloc_oob_right(void)
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{
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char *ptr;
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size_t size = 123;
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pr_info("out-of-bounds to right\n");
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ptr = kmalloc(size, GFP_KERNEL);
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if (!ptr) {
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pr_err("Allocation failed\n");
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return;
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}
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ptr[size] = 'x';
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kfree(ptr);
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}
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static noinline void __init kmalloc_oob_left(void)
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{
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char *ptr;
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size_t size = 15;
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pr_info("out-of-bounds to left\n");
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ptr = kmalloc(size, GFP_KERNEL);
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if (!ptr) {
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pr_err("Allocation failed\n");
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return;
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}
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*ptr = *(ptr - 1);
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kfree(ptr);
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}
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static noinline void __init kmalloc_node_oob_right(void)
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{
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char *ptr;
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size_t size = 4096;
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pr_info("kmalloc_node(): out-of-bounds to right\n");
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ptr = kmalloc_node(size, GFP_KERNEL, 0);
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if (!ptr) {
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pr_err("Allocation failed\n");
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return;
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}
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ptr[size] = 0;
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kfree(ptr);
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}
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#ifdef CONFIG_SLUB
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static noinline void __init kmalloc_pagealloc_oob_right(void)
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{
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char *ptr;
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size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
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/* Allocate a chunk that does not fit into a SLUB cache to trigger
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* the page allocator fallback.
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*/
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pr_info("kmalloc pagealloc allocation: out-of-bounds to right\n");
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ptr = kmalloc(size, GFP_KERNEL);
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if (!ptr) {
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pr_err("Allocation failed\n");
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return;
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}
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ptr[size] = 0;
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kfree(ptr);
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}
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#endif
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static noinline void __init kmalloc_large_oob_right(void)
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{
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char *ptr;
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size_t size = KMALLOC_MAX_CACHE_SIZE - 256;
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/* Allocate a chunk that is large enough, but still fits into a slab
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* and does not trigger the page allocator fallback in SLUB.
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*/
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pr_info("kmalloc large allocation: out-of-bounds to right\n");
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ptr = kmalloc(size, GFP_KERNEL);
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if (!ptr) {
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pr_err("Allocation failed\n");
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return;
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}
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ptr[size] = 0;
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kfree(ptr);
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}
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static noinline void __init kmalloc_oob_krealloc_more(void)
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{
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char *ptr1, *ptr2;
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size_t size1 = 17;
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size_t size2 = 19;
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pr_info("out-of-bounds after krealloc more\n");
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ptr1 = kmalloc(size1, GFP_KERNEL);
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ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
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if (!ptr1 || !ptr2) {
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pr_err("Allocation failed\n");
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kfree(ptr1);
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return;
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}
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ptr2[size2] = 'x';
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kfree(ptr2);
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}
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static noinline void __init kmalloc_oob_krealloc_less(void)
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{
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char *ptr1, *ptr2;
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size_t size1 = 17;
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size_t size2 = 15;
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pr_info("out-of-bounds after krealloc less\n");
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ptr1 = kmalloc(size1, GFP_KERNEL);
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ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
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if (!ptr1 || !ptr2) {
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pr_err("Allocation failed\n");
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kfree(ptr1);
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return;
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}
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ptr2[size2] = 'x';
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kfree(ptr2);
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}
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static noinline void __init kmalloc_oob_16(void)
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{
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struct {
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u64 words[2];
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} *ptr1, *ptr2;
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pr_info("kmalloc out-of-bounds for 16-bytes access\n");
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ptr1 = kmalloc(sizeof(*ptr1) - 3, GFP_KERNEL);
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ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL);
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if (!ptr1 || !ptr2) {
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pr_err("Allocation failed\n");
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kfree(ptr1);
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kfree(ptr2);
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return;
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}
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*ptr1 = *ptr2;
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kfree(ptr1);
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kfree(ptr2);
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}
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static noinline void __init kmalloc_oob_memset_2(void)
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{
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char *ptr;
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size_t size = 8;
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pr_info("out-of-bounds in memset2\n");
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ptr = kmalloc(size, GFP_KERNEL);
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if (!ptr) {
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pr_err("Allocation failed\n");
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return;
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}
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memset(ptr+7, 0, 2);
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kfree(ptr);
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}
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static noinline void __init kmalloc_oob_memset_4(void)
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{
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char *ptr;
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size_t size = 8;
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pr_info("out-of-bounds in memset4\n");
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ptr = kmalloc(size, GFP_KERNEL);
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if (!ptr) {
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pr_err("Allocation failed\n");
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return;
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}
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memset(ptr+5, 0, 4);
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kfree(ptr);
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}
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static noinline void __init kmalloc_oob_memset_8(void)
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{
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char *ptr;
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size_t size = 8;
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pr_info("out-of-bounds in memset8\n");
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ptr = kmalloc(size, GFP_KERNEL);
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if (!ptr) {
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pr_err("Allocation failed\n");
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return;
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}
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memset(ptr+1, 0, 8);
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kfree(ptr);
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}
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static noinline void __init kmalloc_oob_memset_16(void)
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{
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char *ptr;
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size_t size = 16;
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pr_info("out-of-bounds in memset16\n");
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ptr = kmalloc(size, GFP_KERNEL);
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if (!ptr) {
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pr_err("Allocation failed\n");
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return;
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}
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memset(ptr+1, 0, 16);
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kfree(ptr);
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}
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static noinline void __init kmalloc_oob_in_memset(void)
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{
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char *ptr;
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size_t size = 666;
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pr_info("out-of-bounds in memset\n");
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ptr = kmalloc(size, GFP_KERNEL);
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if (!ptr) {
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pr_err("Allocation failed\n");
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return;
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}
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memset(ptr, 0, size+5);
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kfree(ptr);
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}
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static noinline void __init kmalloc_uaf(void)
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{
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char *ptr;
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size_t size = 10;
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pr_info("use-after-free\n");
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ptr = kmalloc(size, GFP_KERNEL);
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if (!ptr) {
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pr_err("Allocation failed\n");
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return;
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}
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kfree(ptr);
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*(ptr + 8) = 'x';
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}
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static noinline void __init kmalloc_uaf_memset(void)
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{
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char *ptr;
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size_t size = 33;
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pr_info("use-after-free in memset\n");
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ptr = kmalloc(size, GFP_KERNEL);
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if (!ptr) {
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pr_err("Allocation failed\n");
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return;
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}
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kfree(ptr);
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memset(ptr, 0, size);
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}
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static noinline void __init kmalloc_uaf2(void)
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{
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char *ptr1, *ptr2;
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size_t size = 43;
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pr_info("use-after-free after another kmalloc\n");
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ptr1 = kmalloc(size, GFP_KERNEL);
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if (!ptr1) {
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pr_err("Allocation failed\n");
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return;
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}
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kfree(ptr1);
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ptr2 = kmalloc(size, GFP_KERNEL);
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if (!ptr2) {
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pr_err("Allocation failed\n");
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return;
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}
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ptr1[40] = 'x';
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if (ptr1 == ptr2)
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pr_err("Could not detect use-after-free: ptr1 == ptr2\n");
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kfree(ptr2);
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}
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static noinline void __init kmem_cache_oob(void)
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{
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char *p;
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size_t size = 200;
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struct kmem_cache *cache = kmem_cache_create("test_cache",
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size, 0,
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0, NULL);
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if (!cache) {
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pr_err("Cache allocation failed\n");
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return;
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}
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pr_info("out-of-bounds in kmem_cache_alloc\n");
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p = kmem_cache_alloc(cache, GFP_KERNEL);
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if (!p) {
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pr_err("Allocation failed\n");
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kmem_cache_destroy(cache);
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return;
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}
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*p = p[size];
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kmem_cache_free(cache, p);
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kmem_cache_destroy(cache);
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}
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static noinline void __init memcg_accounted_kmem_cache(void)
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{
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int i;
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char *p;
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size_t size = 200;
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struct kmem_cache *cache;
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cache = kmem_cache_create("test_cache", size, 0, SLAB_ACCOUNT, NULL);
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if (!cache) {
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pr_err("Cache allocation failed\n");
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return;
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}
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pr_info("allocate memcg accounted object\n");
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/*
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* Several allocations with a delay to allow for lazy per memcg kmem
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* cache creation.
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*/
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for (i = 0; i < 5; i++) {
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p = kmem_cache_alloc(cache, GFP_KERNEL);
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if (!p) {
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pr_err("Allocation failed\n");
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goto free_cache;
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}
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kmem_cache_free(cache, p);
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msleep(100);
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}
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free_cache:
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kmem_cache_destroy(cache);
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}
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static char global_array[10];
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static noinline void __init kasan_global_oob(void)
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{
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volatile int i = 3;
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char *p = &global_array[ARRAY_SIZE(global_array) + i];
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pr_info("out-of-bounds global variable\n");
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*(volatile char *)p;
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}
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static noinline void __init kasan_stack_oob(void)
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{
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char stack_array[10];
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volatile int i = 0;
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char *p = &stack_array[ARRAY_SIZE(stack_array) + i];
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pr_info("out-of-bounds on stack\n");
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*(volatile char *)p;
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}
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static noinline void __init ksize_unpoisons_memory(void)
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{
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char *ptr;
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size_t size = 123, real_size = size;
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pr_info("ksize() unpoisons the whole allocated chunk\n");
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ptr = kmalloc(size, GFP_KERNEL);
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if (!ptr) {
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pr_err("Allocation failed\n");
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return;
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}
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real_size = ksize(ptr);
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/* This access doesn't trigger an error. */
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ptr[size] = 'x';
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/* This one does. */
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ptr[real_size] = 'y';
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kfree(ptr);
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}
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static noinline void __init copy_user_test(void)
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{
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char *kmem;
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char __user *usermem;
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size_t size = 10;
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int unused;
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kmem = kmalloc(size, GFP_KERNEL);
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if (!kmem)
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return;
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usermem = (char __user *)vm_mmap(NULL, 0, PAGE_SIZE,
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PROT_READ | PROT_WRITE | PROT_EXEC,
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MAP_ANONYMOUS | MAP_PRIVATE, 0);
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if (IS_ERR(usermem)) {
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pr_err("Failed to allocate user memory\n");
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kfree(kmem);
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return;
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}
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pr_info("out-of-bounds in copy_from_user()\n");
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unused = copy_from_user(kmem, usermem, size + 1);
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pr_info("out-of-bounds in copy_to_user()\n");
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unused = copy_to_user(usermem, kmem, size + 1);
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pr_info("out-of-bounds in __copy_from_user()\n");
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unused = __copy_from_user(kmem, usermem, size + 1);
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pr_info("out-of-bounds in __copy_to_user()\n");
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unused = __copy_to_user(usermem, kmem, size + 1);
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pr_info("out-of-bounds in __copy_from_user_inatomic()\n");
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unused = __copy_from_user_inatomic(kmem, usermem, size + 1);
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pr_info("out-of-bounds in __copy_to_user_inatomic()\n");
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unused = __copy_to_user_inatomic(usermem, kmem, size + 1);
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pr_info("out-of-bounds in strncpy_from_user()\n");
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unused = strncpy_from_user(kmem, usermem, size + 1);
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vm_munmap((unsigned long)usermem, PAGE_SIZE);
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kfree(kmem);
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}
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static noinline void __init use_after_scope_test(void)
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{
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volatile char *volatile p;
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pr_info("use-after-scope on int\n");
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{
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int local = 0;
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p = (char *)&local;
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}
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p[0] = 1;
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p[3] = 1;
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pr_info("use-after-scope on array\n");
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{
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char local[1024] = {0};
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p = local;
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}
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p[0] = 1;
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p[1023] = 1;
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}
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static int __init kmalloc_tests_init(void)
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{
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kmalloc_oob_right();
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kmalloc_oob_left();
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kmalloc_node_oob_right();
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#ifdef CONFIG_SLUB
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kmalloc_pagealloc_oob_right();
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#endif
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kmalloc_large_oob_right();
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kmalloc_oob_krealloc_more();
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kmalloc_oob_krealloc_less();
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kmalloc_oob_16();
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kmalloc_oob_in_memset();
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kmalloc_oob_memset_2();
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kmalloc_oob_memset_4();
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kmalloc_oob_memset_8();
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kmalloc_oob_memset_16();
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kmalloc_uaf();
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kmalloc_uaf_memset();
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kmalloc_uaf2();
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kmem_cache_oob();
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memcg_accounted_kmem_cache();
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kasan_stack_oob();
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kasan_global_oob();
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ksize_unpoisons_memory();
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copy_user_test();
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use_after_scope_test();
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return -EAGAIN;
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}
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module_init(kmalloc_tests_init);
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MODULE_LICENSE("GPL");
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