fs/binfmt_elf_test.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 #include <kunit/test.h>
   3
   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);