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kasan: remove vmalloc_percpu test

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Commit 1a2473f0cb ("kasan: improve vmalloc tests") added the
vmalloc_percpu KASAN test with the assumption that __alloc_percpu always
uses vmalloc internally, which is tagged by KASAN.

However, __alloc_percpu might allocate memory from the first per-CPU
chunk, which is not allocated via vmalloc().  As a result, the test might
fail.

Remove the test until proper KASAN annotation for the per-CPU allocated
are added; tracked in https://bugzilla.kernel.org/show_bug.cgi?id=215019.

Link: https://lkml.kernel.org/r/20241022160706.38943-1-andrey.konovalov@linux.dev
Fixes: 1a2473f0cb ("kasan: improve vmalloc tests")
Signed-off-by: Andrey Konovalov <andreyknvl@gmail.com>
Reported-by: Samuel Holland <samuel.holland@sifive.com>
Link: https://lore.kernel.org/all/4a245fff-cc46-44d1-a5f9-fd2f1c3764ae@sifive.com/
Reported-by: Sabyrzhan Tasbolatov <snovitoll@gmail.com>
Link: https://lore.kernel.org/all/CACzwLxiWzNqPBp4C1VkaXZ2wDwvY3yZeetCi1TLGFipKW77drA@mail.gmail.com/
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Marco Elver <elver@google.com>
Cc: Sabyrzhan Tasbolatov <snovitoll@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Andrey Konovalov 2024-10-22 18:07:06 +02:00 committed by Andrew Morton
parent ece5897e5a
commit 330d8df81f
1 changed files with 0 additions and 27 deletions
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27
mm/kasan/kasan_test_c.c
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@ -1810,32 +1810,6 @@ static void vm_map_ram_tags(struct kunit *test)
free_pages((unsigned long)p_ptr, 1); free_pages((unsigned long)p_ptr, 1);
} }
static void vmalloc_percpu(struct kunit *test)
{
char __percpu *ptr;
int cpu;
/*
* This test is specifically crafted for the software tag-based mode,
* the only tag-based mode that poisons percpu mappings.
*/
KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_SW_TAGS);
ptr = __alloc_percpu(PAGE_SIZE, PAGE_SIZE);
for_each_possible_cpu(cpu) {
char *c_ptr = per_cpu_ptr(ptr, cpu);
KUNIT_EXPECT_GE(test, (u8)get_tag(c_ptr), (u8)KASAN_TAG_MIN);
KUNIT_EXPECT_LT(test, (u8)get_tag(c_ptr), (u8)KASAN_TAG_KERNEL);
/* Make sure that in-bounds accesses don't crash the kernel. */
*c_ptr = 0;
}
free_percpu(ptr);
}
/* /*
* Check that the assigned pointer tag falls within the [KASAN_TAG_MIN, * Check that the assigned pointer tag falls within the [KASAN_TAG_MIN,
* KASAN_TAG_KERNEL) range (note: excluding the match-all tag) for tag-based * KASAN_TAG_KERNEL) range (note: excluding the match-all tag) for tag-based
@ -2023,7 +1997,6 @@ static struct kunit_case kasan_kunit_test_cases[] = {
KUNIT_CASE(vmalloc_oob), KUNIT_CASE(vmalloc_oob),
KUNIT_CASE(vmap_tags), KUNIT_CASE(vmap_tags),
KUNIT_CASE(vm_map_ram_tags), KUNIT_CASE(vm_map_ram_tags),
KUNIT_CASE(vmalloc_percpu),
KUNIT_CASE(match_all_not_assigned), KUNIT_CASE(match_all_not_assigned),
KUNIT_CASE(match_all_ptr_tag), KUNIT_CASE(match_all_ptr_tag),
KUNIT_CASE(match_all_mem_tag), KUNIT_CASE(match_all_mem_tag),