1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <kunit/test.h>
3
total_mapping_size_test(struct kunit * test)4 static void total_mapping_size_test(struct kunit *test)
5 {
6 struct elf_phdr empty[] = {
7 { .p_type = PT_LOAD, .p_vaddr = 0, .p_memsz = 0, },
8 { .p_type = PT_INTERP, .p_vaddr = 10, .p_memsz = 999999, },
9 };
10 /*
11 * readelf -lW /bin/mount | grep '^ .*0x0' | awk '{print "\t\t{ .p_type = PT_" \
12 * $1 ", .p_vaddr = " $3 ", .p_memsz = " $6 ", },"}'
13 */
14 struct elf_phdr mount[] = {
15 { .p_type = PT_PHDR, .p_vaddr = 0x00000040, .p_memsz = 0x0002d8, },
16 { .p_type = PT_INTERP, .p_vaddr = 0x00000318, .p_memsz = 0x00001c, },
17 { .p_type = PT_LOAD, .p_vaddr = 0x00000000, .p_memsz = 0x0033a8, },
18 { .p_type = PT_LOAD, .p_vaddr = 0x00004000, .p_memsz = 0x005c91, },
19 { .p_type = PT_LOAD, .p_vaddr = 0x0000a000, .p_memsz = 0x0022f8, },
20 { .p_type = PT_LOAD, .p_vaddr = 0x0000d330, .p_memsz = 0x000d40, },
21 { .p_type = PT_DYNAMIC, .p_vaddr = 0x0000d928, .p_memsz = 0x000200, },
22 { .p_type = PT_NOTE, .p_vaddr = 0x00000338, .p_memsz = 0x000030, },
23 { .p_type = PT_NOTE, .p_vaddr = 0x00000368, .p_memsz = 0x000044, },
24 { .p_type = PT_GNU_PROPERTY, .p_vaddr = 0x00000338, .p_memsz = 0x000030, },
25 { .p_type = PT_GNU_EH_FRAME, .p_vaddr = 0x0000b490, .p_memsz = 0x0001ec, },
26 { .p_type = PT_GNU_STACK, .p_vaddr = 0x00000000, .p_memsz = 0x000000, },
27 { .p_type = PT_GNU_RELRO, .p_vaddr = 0x0000d330, .p_memsz = 0x000cd0, },
28 };
29 size_t mount_size = 0xE070;
30 /* https://lore.kernel.org/linux-fsdevel/YfF18Dy85mCntXrx@fractal.localdomain */
31 struct elf_phdr unordered[] = {
32 { .p_type = PT_LOAD, .p_vaddr = 0x00000000, .p_memsz = 0x0033a8, },
33 { .p_type = PT_LOAD, .p_vaddr = 0x0000d330, .p_memsz = 0x000d40, },
34 { .p_type = PT_LOAD, .p_vaddr = 0x00004000, .p_memsz = 0x005c91, },
35 { .p_type = PT_LOAD, .p_vaddr = 0x0000a000, .p_memsz = 0x0022f8, },
36 };
37
38 /* No headers, no size. */
39 KUNIT_EXPECT_EQ(test, total_mapping_size(NULL, 0), 0);
40 KUNIT_EXPECT_EQ(test, total_mapping_size(empty, 0), 0);
41 /* Empty headers, no size. */
42 KUNIT_EXPECT_EQ(test, total_mapping_size(empty, 1), 0);
43 /* No PT_LOAD headers, no size. */
44 KUNIT_EXPECT_EQ(test, total_mapping_size(&empty[1], 1), 0);
45 /* Empty PT_LOAD and non-PT_LOAD headers, no size. */
46 KUNIT_EXPECT_EQ(test, total_mapping_size(empty, 2), 0);
47
48 /* Normal set of PT_LOADS, and expected size. */
49 KUNIT_EXPECT_EQ(test, total_mapping_size(mount, ARRAY_SIZE(mount)), mount_size);
50 /* Unordered PT_LOADs result in same size. */
51 KUNIT_EXPECT_EQ(test, total_mapping_size(unordered, ARRAY_SIZE(unordered)), mount_size);
52 }
53
54 static struct kunit_case binfmt_elf_test_cases[] = {
55 KUNIT_CASE(total_mapping_size_test),
56 {},
57 };
58
59 static struct kunit_suite binfmt_elf_test_suite = {
60 .name = KBUILD_MODNAME,
61 .test_cases = binfmt_elf_test_cases,
62 };
63
64 kunit_test_suite(binfmt_elf_test_suite);
65