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lib/test_kasan: add bitops tests

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Patch series "Bitops instrumentation for KASAN", v5.

This patch (of 3):

This adds bitops tests to the test_kasan module.  In a follow-up patch,
support for bitops instrumentation will be added.

Link: http://lkml.kernel.org/r/20190613125950.197667-2-elver@google.com
Signed-off-by: Marco Elver <elver@google.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Marco Elver 2019-07-11 20:53:52 -07:00 committed by Linus Torvalds
parent e896921900
commit 19a33ca6c2
1 changed files with 78 additions and 3 deletions
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81
lib/test_kasan.c
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@ -7,16 +7,17 @@
#define pr_fmt(fmt) "kasan test: %s " fmt, __func__
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/kasan.h>
#include <linux/kernel.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/module.h>
#include <linux/printk.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/uaccess.h>
#include <linux/module.h>
#include <linux/kasan.h>
/*
* Note: test functions are marked noinline so that their names appear in
@ -619,6 +620,79 @@ static noinline void __init kasan_strings(void)
strnlen(ptr, 1);
}
static noinline void __init kasan_bitops(void)
{
/*
* Allocate 1 more byte, which causes kzalloc to round up to 16-bytes;
* this way we do not actually corrupt other memory.
*/
long *bits = kzalloc(sizeof(*bits) + 1, GFP_KERNEL);
if (!bits)
return;
/*
* Below calls try to access bit within allocated memory; however, the
* below accesses are still out-of-bounds, since bitops are defined to
* operate on the whole long the bit is in.
*/
pr_info("out-of-bounds in set_bit\n");
set_bit(BITS_PER_LONG, bits);
pr_info("out-of-bounds in __set_bit\n");
__set_bit(BITS_PER_LONG, bits);
pr_info("out-of-bounds in clear_bit\n");
clear_bit(BITS_PER_LONG, bits);
pr_info("out-of-bounds in __clear_bit\n");
__clear_bit(BITS_PER_LONG, bits);
pr_info("out-of-bounds in clear_bit_unlock\n");
clear_bit_unlock(BITS_PER_LONG, bits);
pr_info("out-of-bounds in __clear_bit_unlock\n");
__clear_bit_unlock(BITS_PER_LONG, bits);
pr_info("out-of-bounds in change_bit\n");
change_bit(BITS_PER_LONG, bits);
pr_info("out-of-bounds in __change_bit\n");
__change_bit(BITS_PER_LONG, bits);
/*
* Below calls try to access bit beyond allocated memory.
*/
pr_info("out-of-bounds in test_and_set_bit\n");
test_and_set_bit(BITS_PER_LONG + BITS_PER_BYTE, bits);
pr_info("out-of-bounds in __test_and_set_bit\n");
__test_and_set_bit(BITS_PER_LONG + BITS_PER_BYTE, bits);
pr_info("out-of-bounds in test_and_set_bit_lock\n");
test_and_set_bit_lock(BITS_PER_LONG + BITS_PER_BYTE, bits);
pr_info("out-of-bounds in test_and_clear_bit\n");
test_and_clear_bit(BITS_PER_LONG + BITS_PER_BYTE, bits);
pr_info("out-of-bounds in __test_and_clear_bit\n");
__test_and_clear_bit(BITS_PER_LONG + BITS_PER_BYTE, bits);
pr_info("out-of-bounds in test_and_change_bit\n");
test_and_change_bit(BITS_PER_LONG + BITS_PER_BYTE, bits);
pr_info("out-of-bounds in __test_and_change_bit\n");
__test_and_change_bit(BITS_PER_LONG + BITS_PER_BYTE, bits);
pr_info("out-of-bounds in test_bit\n");
(void)test_bit(BITS_PER_LONG + BITS_PER_BYTE, bits);
#if defined(clear_bit_unlock_is_negative_byte)
pr_info("out-of-bounds in clear_bit_unlock_is_negative_byte\n");
clear_bit_unlock_is_negative_byte(BITS_PER_LONG + BITS_PER_BYTE, bits);
#endif
kfree(bits);
}
static int __init kmalloc_tests_init(void)
{
/*
@ -660,6 +734,7 @@ static int __init kmalloc_tests_init(void)
kasan_memchr();
kasan_memcmp();
kasan_strings();
kasan_bitops();
kasan_restore_multi_shot(multishot);