path: root/drivers/misc/lkdtm/bugs.c

// SPDX-License-Identifier: GPL-2.0
/*
 * This is for all the tests related to logic bugs (e.g. bad dereferences,
 * bad alignment, bad loops, bad locking, bad scheduling, deep stacks, and
 * lockups) along with other things that don't fit well into existing LKDTM
 * test source files.
 */
#include "lkdtm.h"
#include <linux/list.h>
#include <linux/sched.h>
#include <linux/sched/signal.h>
#include <linux/sched/task_stack.h>
#include <linux/uaccess.h>

struct lkdtm_list {
	struct list_head node;
};

/*
 * Make sure our attempts to over run the kernel stack doesn't trigger
 * a compiler warning when CONFIG_FRAME_WARN is set. Then make sure we
 * recurse past the end of THREAD_SIZE by default.
 */
#if defined(CONFIG_FRAME_WARN) && (CONFIG_FRAME_WARN > 0)
#define REC_STACK_SIZE (CONFIG_FRAME_WARN / 2)
#else
#define REC_STACK_SIZE (THREAD_SIZE / 8)
#endif
#define REC_NUM_DEFAULT ((THREAD_SIZE / REC_STACK_SIZE) * 2)

static int recur_count = REC_NUM_DEFAULT;

static DEFINE_SPINLOCK(lock_me_up);

/*
 * Make sure compiler does not optimize this function or stack frame away:
 * - function marked noinline
 * - stack variables are marked volatile
 * - stack variables are written (memset()) and read (pr_info())
 * - function has external effects (pr_info())
 * */
static int noinline recursive_loop(int remaining)
{
	volatile char buf[REC_STACK_SIZE];

	memset((void *)buf, remaining & 0xFF, sizeof(buf));
	pr_info("loop %d/%d ...\n", (int)buf[remaining % sizeof(buf)],
		recur_count);
	if (!remaining)
		return 0;
	else
		return recursive_loop(remaining - 1);
}

/* If the depth is negative, use the default, otherwise keep parameter. */
void __init lkdtm_bugs_init(int *recur_param)
{
	if (*recur_param < 0)
		*recur_param = recur_count;
	else
		recur_count = *recur_param;
}

void lkdtm_PANIC(void)
{
	panic("dumptest");
}

void lkdtm_BUG(void)
{
	BUG();
}

static int warn_counter;

void lkdtm_WARNING(void)
{
	WARN(1, "Warning message trigger count: %d\n", warn_counter++);
}

void lkdtm_EXCEPTION(void)
{
	*((volatile int *) 0) = 0;
}

void lkdtm_LOOP(void)
{
	for (;;)
		;
}

void lkdtm_EXHAUST_STACK(void)
{
	pr_info("Calling function with %d frame size to depth %d ...\n",
		REC_STACK_SIZE, recur_count);
	recursive_loop(recur_count);
	pr_info("FAIL: survived without exhausting stack?!\n");
}

static noinline void __lkdtm_CORRUPT_STACK(void *stack)
{
	memset(stack, '\xff', 64);
}

/* This should trip the stack canary, not corrupt the return address. */
noinline void lkdtm_CORRUPT_STACK(void)
{
	/* Use default char array length that triggers stack protection. */
	char data[8] __aligned(sizeof(void *));

	__lkdtm_CORRUPT_STACK(&data);

	pr_info("Corrupted stack containing char array ...\n");
}

/* Same as above but will only get a canary with -fstack-protector-strong */
noinline void lkdtm_CORRUPT_STACK_STRONG(void)
{
	union {
		unsigned short shorts[4];
		unsigned long *ptr;
	} data __aligned(sizeof(void *));

	__lkdtm_CORRUPT_STACK(&data);

	pr_info("Corrupted stack containing union ...\n");
}

void lkdtm_UNALIGNED_LOAD_STORE_WRITE(void)
{
	static u8 data[5] __attribute__((aligned(4))) = {1, 2, 3, 4, 5};
	u32 *p;
	u32 val = 0x12345678;

	p = (u32 *)(data + 1);
	if (*p == 0)
		val = 0x87654321;
	*p = val;
}

void lkdtm_SOFTLOCKUP(void)
{
	preempt_disable();
	for (;;)
		cpu_relax();
}

void lkdtm_HARDLOCKUP(void)
{
	local_irq_disable();
	for (;;)
		cpu_relax();
}

void lkdtm_SPINLOCKUP(void)
{
	/* Must be called twice to trigger. */
	spin_lock(&lock_me_up);
	/* Let sparse know we intended to exit holding the lock. */
	__release(&lock_me_up);
}

void lkdtm_HUNG_TASK(void)
{
	set_current_state(TASK_UNINTERRUPTIBLE);
	schedule();
}

void lkdtm_CORRUPT_LIST_ADD(void)
{
	/*
	 * Initially, an empty list via LIST_HEAD:
	 *	test_head.next = &test_head
	 *	test_head.prev = &test_head
	 */
	LIST_HEAD(test_head);
	struct lkdtm_list good, bad;
	void *target[2] = { };
	void *redirection = &target;

	pr_info("attempting good list addition\n");

	/*
	 * Adding to the list performs these actions:
	 *	test_head.next->prev = &good.node
	 *	good.node.next = test_head.next
	 *	good.node.prev = test_head
	 *	test_head.next = good.node
	 */
	list_add(&good.node, &test_head);

	pr_info("attempting corrupted list addition\n");
	/*
	 * In simulating this "write what where" primitive, the "what" is
	 * the address of &bad.node, and the "where" is the address held
	 * by "redirection".
	 */
	test_head.next = redirection;
	list_add(&bad.node, &test_head);

	if (target[0] == NULL && target[1] == NULL)
		pr_err("Overwrite did not happen, but no BUG?!\n");
	else
		pr_err("list_add() corruption not detected!\n");
}

void lkdtm_CORRUPT_LIST_DEL(void)
{
	LIST_HEAD(test_head);
	struct lkdtm_list item;
	void *target[2] = { };
	void *redirection = &target;

	list_add(&item.node, &test_head);

	pr_info("attempting good list removal\n");
	list_del(&item.node);

	pr_info("attempting corrupted list removal\n");
	list_add(&item.node, &test_head);

	/* As with the list_add() test above, this corrupts "next". */
	item.node.next = redirection;
	list_del(&item.node);

	if (target[0] == NULL && target[1] == NULL)
		pr_err("Overwrite did not happen, but no BUG?!\n");
	else
		pr_err("list_del() corruption not detected!\n");
}

/* Test if unbalanced set_fs(KERNEL_DS)/set_fs(USER_DS) check exists. */
void lkdtm_CORRUPT_USER_DS(void)
{
	pr_info("setting bad task size limit\n");
	set_fs(KERNEL_DS);

	/* Make sure we do not keep running with a KERNEL_DS! */
	force_sig(SIGKILL);
}

/* Test that VMAP_STACK is actually allocating with a leading guard page */
void lkdtm_STACK_GUARD_PAGE_LEADING(void)
{
	const unsigned char *stack = task_stack_page(current);
	const unsigned char *ptr = stack - 1;
	volatile unsigned char byte;

	pr_info("attempting bad read from page below current stack\n");

	byte = *ptr;

	pr_err("FAIL: accessed page before stack!\n");
}

/* Test that VMAP_STACK is actually allocating with a trailing guard page */
void lkdtm_STACK_GUARD_PAGE_TRAILING(void)
{
	const unsigned char *stack = task_stack_page(current);
	const unsigned char *ptr = stack + THREAD_SIZE;
	volatile unsigned char byte;

	pr_info("attempting bad read from page above current stack\n");

	byte = *ptr;

	pr_err("FAIL: accessed page after stack!\n");
}