cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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test_list_sort.c (3351B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2#include <kunit/test.h>
      3
      4#include <linux/kernel.h>
      5#include <linux/list_sort.h>
      6#include <linux/list.h>
      7#include <linux/module.h>
      8#include <linux/printk.h>
      9#include <linux/slab.h>
     10#include <linux/random.h>
     11
     12/*
     13 * The pattern of set bits in the list length determines which cases
     14 * are hit in list_sort().
     15 */
     16#define TEST_LIST_LEN (512+128+2) /* not including head */
     17
     18#define TEST_POISON1 0xDEADBEEF
     19#define TEST_POISON2 0xA324354C
     20
     21struct debug_el {
     22	unsigned int poison1;
     23	struct list_head list;
     24	unsigned int poison2;
     25	int value;
     26	unsigned int serial;
     27};
     28
     29static void check(struct kunit *test, struct debug_el *ela, struct debug_el *elb)
     30{
     31	struct debug_el **elts = test->priv;
     32
     33	KUNIT_EXPECT_LT_MSG(test, ela->serial, (unsigned int)TEST_LIST_LEN, "incorrect serial");
     34	KUNIT_EXPECT_LT_MSG(test, elb->serial, (unsigned int)TEST_LIST_LEN, "incorrect serial");
     35
     36	KUNIT_EXPECT_PTR_EQ_MSG(test, elts[ela->serial], ela, "phantom element");
     37	KUNIT_EXPECT_PTR_EQ_MSG(test, elts[elb->serial], elb, "phantom element");
     38
     39	KUNIT_EXPECT_EQ_MSG(test, ela->poison1, TEST_POISON1, "bad poison");
     40	KUNIT_EXPECT_EQ_MSG(test, ela->poison2, TEST_POISON2, "bad poison");
     41
     42	KUNIT_EXPECT_EQ_MSG(test, elb->poison1, TEST_POISON1, "bad poison");
     43	KUNIT_EXPECT_EQ_MSG(test, elb->poison2, TEST_POISON2, "bad poison");
     44}
     45
     46/* `priv` is the test pointer so check() can fail the test if the list is invalid. */
     47static int cmp(void *priv, const struct list_head *a, const struct list_head *b)
     48{
     49	struct debug_el *ela, *elb;
     50
     51	ela = container_of(a, struct debug_el, list);
     52	elb = container_of(b, struct debug_el, list);
     53
     54	check(priv, ela, elb);
     55	return ela->value - elb->value;
     56}
     57
     58static void list_sort_test(struct kunit *test)
     59{
     60	int i, count = 1;
     61	struct debug_el *el, **elts;
     62	struct list_head *cur;
     63	LIST_HEAD(head);
     64
     65	elts = kunit_kcalloc(test, TEST_LIST_LEN, sizeof(*elts), GFP_KERNEL);
     66	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, elts);
     67	test->priv = elts;
     68
     69	for (i = 0; i < TEST_LIST_LEN; i++) {
     70		el = kunit_kmalloc(test, sizeof(*el), GFP_KERNEL);
     71		KUNIT_ASSERT_NOT_ERR_OR_NULL(test, el);
     72
     73		 /* force some equivalencies */
     74		el->value = prandom_u32() % (TEST_LIST_LEN / 3);
     75		el->serial = i;
     76		el->poison1 = TEST_POISON1;
     77		el->poison2 = TEST_POISON2;
     78		elts[i] = el;
     79		list_add_tail(&el->list, &head);
     80	}
     81
     82	list_sort(test, &head, cmp);
     83
     84	for (cur = head.next; cur->next != &head; cur = cur->next) {
     85		struct debug_el *el1;
     86		int cmp_result;
     87
     88		KUNIT_ASSERT_PTR_EQ_MSG(test, cur->next->prev, cur,
     89					"list is corrupted");
     90
     91		cmp_result = cmp(test, cur, cur->next);
     92		KUNIT_ASSERT_LE_MSG(test, cmp_result, 0, "list is not sorted");
     93
     94		el = container_of(cur, struct debug_el, list);
     95		el1 = container_of(cur->next, struct debug_el, list);
     96		if (cmp_result == 0) {
     97			KUNIT_ASSERT_LE_MSG(test, el->serial, el1->serial,
     98					    "order of equivalent elements not preserved");
     99		}
    100
    101		check(test, el, el1);
    102		count++;
    103	}
    104	KUNIT_EXPECT_PTR_EQ_MSG(test, head.prev, cur, "list is corrupted");
    105
    106	KUNIT_EXPECT_EQ_MSG(test, count, TEST_LIST_LEN,
    107			    "list length changed after sorting!");
    108}
    109
    110static struct kunit_case list_sort_cases[] = {
    111	KUNIT_CASE(list_sort_test),
    112	{}
    113};
    114
    115static struct kunit_suite list_sort_suite = {
    116	.name = "list_sort",
    117	.test_cases = list_sort_cases,
    118};
    119
    120kunit_test_suites(&list_sort_suite);
    121
    122MODULE_LICENSE("GPL");