the-tree/fs/binfmt_elf_test.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 #include <kunit/test.h>
0003
0004 static void total_mapping_size_test(struct kunit *test)
0005 {
0006     struct elf_phdr empty[] = {
0007         { .p_type = PT_LOAD, .p_vaddr = 0, .p_memsz = 0, },
0008         { .p_type = PT_INTERP, .p_vaddr = 10, .p_memsz = 999999, },
0009     };
0010     /*
0011      * readelf -lW /bin/mount | grep '^  .*0x0' | awk '{print "\t\t{ .p_type = PT_" \
0012      *              $1 ", .p_vaddr = " $3 ", .p_memsz = " $6 ", },"}'
0013      */
0014     struct elf_phdr mount[] = {
0015         { .p_type = PT_PHDR, .p_vaddr = 0x00000040, .p_memsz = 0x0002d8, },
0016         { .p_type = PT_INTERP, .p_vaddr = 0x00000318, .p_memsz = 0x00001c, },
0017         { .p_type = PT_LOAD, .p_vaddr = 0x00000000, .p_memsz = 0x0033a8, },
0018         { .p_type = PT_LOAD, .p_vaddr = 0x00004000, .p_memsz = 0x005c91, },
0019         { .p_type = PT_LOAD, .p_vaddr = 0x0000a000, .p_memsz = 0x0022f8, },
0020         { .p_type = PT_LOAD, .p_vaddr = 0x0000d330, .p_memsz = 0x000d40, },
0021         { .p_type = PT_DYNAMIC, .p_vaddr = 0x0000d928, .p_memsz = 0x000200, },
0022         { .p_type = PT_NOTE, .p_vaddr = 0x00000338, .p_memsz = 0x000030, },
0023         { .p_type = PT_NOTE, .p_vaddr = 0x00000368, .p_memsz = 0x000044, },
0024         { .p_type = PT_GNU_PROPERTY, .p_vaddr = 0x00000338, .p_memsz = 0x000030, },
0025         { .p_type = PT_GNU_EH_FRAME, .p_vaddr = 0x0000b490, .p_memsz = 0x0001ec, },
0026         { .p_type = PT_GNU_STACK, .p_vaddr = 0x00000000, .p_memsz = 0x000000, },
0027         { .p_type = PT_GNU_RELRO, .p_vaddr = 0x0000d330, .p_memsz = 0x000cd0, },
0028     };
0029     size_t mount_size = 0xE070;
0030     /* https://lore.kernel.org/linux-fsdevel/YfF18Dy85mCntXrx@fractal.localdomain */
0031     struct elf_phdr unordered[] = {
0032         { .p_type = PT_LOAD, .p_vaddr = 0x00000000, .p_memsz = 0x0033a8, },
0033         { .p_type = PT_LOAD, .p_vaddr = 0x0000d330, .p_memsz = 0x000d40, },
0034         { .p_type = PT_LOAD, .p_vaddr = 0x00004000, .p_memsz = 0x005c91, },
0035         { .p_type = PT_LOAD, .p_vaddr = 0x0000a000, .p_memsz = 0x0022f8, },
0036     };
0037
0038     /* No headers, no size. */
0039     KUNIT_EXPECT_EQ(test, total_mapping_size(NULL, 0), 0);
0040     KUNIT_EXPECT_EQ(test, total_mapping_size(empty, 0), 0);
0041     /* Empty headers, no size. */
0042     KUNIT_EXPECT_EQ(test, total_mapping_size(empty, 1), 0);
0043     /* No PT_LOAD headers, no size. */
0044     KUNIT_EXPECT_EQ(test, total_mapping_size(&empty[1], 1), 0);
0045     /* Empty PT_LOAD and non-PT_LOAD headers, no size. */
0046     KUNIT_EXPECT_EQ(test, total_mapping_size(empty, 2), 0);
0047
0048     /* Normal set of PT_LOADS, and expected size. */
0049     KUNIT_EXPECT_EQ(test, total_mapping_size(mount, ARRAY_SIZE(mount)), mount_size);
0050     /* Unordered PT_LOADs result in same size. */
0051     KUNIT_EXPECT_EQ(test, total_mapping_size(unordered, ARRAY_SIZE(unordered)), mount_size);
0052 }
0053
0054 static struct kunit_case binfmt_elf_test_cases[] = {
0055     KUNIT_CASE(total_mapping_size_test),
0056     {},
0057 };
0058
0059 static struct kunit_suite binfmt_elf_test_suite = {
0060     .name = KBUILD_MODNAME,
0061     .test_cases = binfmt_elf_test_cases,
0062 };
0063
0064 kunit_test_suite(binfmt_elf_test_suite);