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a285909f47
slub_kunit does not expect other debugging flags to be set when running tests. When SLAB_RED_ZONE flag is set globally, test fails because the flag affects number of errors reported. To make slub_kunit unaffected by user specified debugging flags, introduce SLAB_NO_USER_FLAGS to ignore them. With this flag, only flags specified in the code are used and others are ignored. Suggested-by: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Link: https://lore.kernel.org/r/Yk0sY9yoJhFEXWOg@hyeyoo
152 lines
3.4 KiB
C
152 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <kunit/test.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include "../mm/slab.h"
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static struct kunit_resource resource;
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static int slab_errors;
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static void test_clobber_zone(struct kunit *test)
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{
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struct kmem_cache *s = kmem_cache_create("TestSlub_RZ_alloc", 64, 0,
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SLAB_RED_ZONE|SLAB_NO_USER_FLAGS, NULL);
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u8 *p = kmem_cache_alloc(s, GFP_KERNEL);
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kasan_disable_current();
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p[64] = 0x12;
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validate_slab_cache(s);
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KUNIT_EXPECT_EQ(test, 2, slab_errors);
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kasan_enable_current();
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kmem_cache_free(s, p);
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kmem_cache_destroy(s);
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}
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#ifndef CONFIG_KASAN
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static void test_next_pointer(struct kunit *test)
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{
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struct kmem_cache *s = kmem_cache_create("TestSlub_next_ptr_free", 64, 0,
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SLAB_POISON|SLAB_NO_USER_FLAGS, NULL);
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u8 *p = kmem_cache_alloc(s, GFP_KERNEL);
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unsigned long tmp;
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unsigned long *ptr_addr;
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kmem_cache_free(s, p);
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ptr_addr = (unsigned long *)(p + s->offset);
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tmp = *ptr_addr;
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p[s->offset] = 0x12;
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/*
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* Expecting three errors.
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* One for the corrupted freechain and the other one for the wrong
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* count of objects in use. The third error is fixing broken cache.
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*/
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validate_slab_cache(s);
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KUNIT_EXPECT_EQ(test, 3, slab_errors);
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/*
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* Try to repair corrupted freepointer.
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* Still expecting two errors. The first for the wrong count
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* of objects in use.
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* The second error is for fixing broken cache.
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*/
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*ptr_addr = tmp;
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slab_errors = 0;
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validate_slab_cache(s);
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KUNIT_EXPECT_EQ(test, 2, slab_errors);
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/*
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* Previous validation repaired the count of objects in use.
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* Now expecting no error.
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*/
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slab_errors = 0;
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validate_slab_cache(s);
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KUNIT_EXPECT_EQ(test, 0, slab_errors);
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kmem_cache_destroy(s);
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}
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static void test_first_word(struct kunit *test)
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{
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struct kmem_cache *s = kmem_cache_create("TestSlub_1th_word_free", 64, 0,
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SLAB_POISON|SLAB_NO_USER_FLAGS, NULL);
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u8 *p = kmem_cache_alloc(s, GFP_KERNEL);
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kmem_cache_free(s, p);
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*p = 0x78;
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validate_slab_cache(s);
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KUNIT_EXPECT_EQ(test, 2, slab_errors);
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kmem_cache_destroy(s);
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}
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static void test_clobber_50th_byte(struct kunit *test)
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{
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struct kmem_cache *s = kmem_cache_create("TestSlub_50th_word_free", 64, 0,
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SLAB_POISON|SLAB_NO_USER_FLAGS, NULL);
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u8 *p = kmem_cache_alloc(s, GFP_KERNEL);
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kmem_cache_free(s, p);
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p[50] = 0x9a;
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validate_slab_cache(s);
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KUNIT_EXPECT_EQ(test, 2, slab_errors);
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kmem_cache_destroy(s);
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}
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#endif
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static void test_clobber_redzone_free(struct kunit *test)
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{
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struct kmem_cache *s = kmem_cache_create("TestSlub_RZ_free", 64, 0,
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SLAB_RED_ZONE|SLAB_NO_USER_FLAGS, NULL);
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u8 *p = kmem_cache_alloc(s, GFP_KERNEL);
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kasan_disable_current();
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kmem_cache_free(s, p);
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p[64] = 0xab;
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validate_slab_cache(s);
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KUNIT_EXPECT_EQ(test, 2, slab_errors);
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kasan_enable_current();
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kmem_cache_destroy(s);
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}
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static int test_init(struct kunit *test)
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{
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slab_errors = 0;
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kunit_add_named_resource(test, NULL, NULL, &resource,
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"slab_errors", &slab_errors);
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return 0;
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}
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static struct kunit_case test_cases[] = {
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KUNIT_CASE(test_clobber_zone),
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#ifndef CONFIG_KASAN
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KUNIT_CASE(test_next_pointer),
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KUNIT_CASE(test_first_word),
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KUNIT_CASE(test_clobber_50th_byte),
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#endif
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KUNIT_CASE(test_clobber_redzone_free),
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{}
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};
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static struct kunit_suite test_suite = {
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.name = "slub_test",
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.init = test_init,
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.test_cases = test_cases,
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};
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kunit_test_suite(test_suite);
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MODULE_LICENSE("GPL");
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