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9e1a3ce0a9
Adds simple KUnit test for some binfmt_elf internals: specifically a
regression test for the problem fixed by commit 8904d9cd90ee ("ELF:
fix overflow in total mapping size calculation").
$ ./tools/testing/kunit/kunit.py run --arch x86_64 \
--kconfig_add CONFIG_IA32_EMULATION=y '*binfmt_elf'
...
[19:41:08] ================== binfmt_elf (1 subtest) ==================
[19:41:08] [PASSED] total_mapping_size_test
[19:41:08] =================== [PASSED] binfmt_elf ====================
[19:41:08] ============== compat_binfmt_elf (1 subtest) ===============
[19:41:08] [PASSED] total_mapping_size_test
[19:41:08] ================ [PASSED] compat_binfmt_elf ================
[19:41:08] ============================================================
[19:41:08] Testing complete. Passed: 2, Failed: 0, Crashed: 0, Skipped: 0, Errors: 0
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: David Gow <davidgow@google.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: "Magnus Groß" <magnus.gross@rwth-aachen.de>
Cc: kunit-dev@googlegroups.com
Cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
v1: https://lore.kernel.org/lkml/20220224054332.1852813-1-keescook@chromium.org
v2:
- improve commit log
- fix comment URL (Daniel)
- drop redundant KUnit Kconfig help info (Daniel)
- note in Kconfig help that COMPAT builds add a compat test (David)
64 lines
2.7 KiB
C
64 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <kunit/test.h>
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static void total_mapping_size_test(struct kunit *test)
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{
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struct elf_phdr empty[] = {
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{ .p_type = PT_LOAD, .p_vaddr = 0, .p_memsz = 0, },
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{ .p_type = PT_INTERP, .p_vaddr = 10, .p_memsz = 999999, },
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};
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/*
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* readelf -lW /bin/mount | grep '^ .*0x0' | awk '{print "\t\t{ .p_type = PT_" \
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* $1 ", .p_vaddr = " $3 ", .p_memsz = " $6 ", },"}'
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*/
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struct elf_phdr mount[] = {
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{ .p_type = PT_PHDR, .p_vaddr = 0x00000040, .p_memsz = 0x0002d8, },
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{ .p_type = PT_INTERP, .p_vaddr = 0x00000318, .p_memsz = 0x00001c, },
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{ .p_type = PT_LOAD, .p_vaddr = 0x00000000, .p_memsz = 0x0033a8, },
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{ .p_type = PT_LOAD, .p_vaddr = 0x00004000, .p_memsz = 0x005c91, },
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{ .p_type = PT_LOAD, .p_vaddr = 0x0000a000, .p_memsz = 0x0022f8, },
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{ .p_type = PT_LOAD, .p_vaddr = 0x0000d330, .p_memsz = 0x000d40, },
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{ .p_type = PT_DYNAMIC, .p_vaddr = 0x0000d928, .p_memsz = 0x000200, },
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{ .p_type = PT_NOTE, .p_vaddr = 0x00000338, .p_memsz = 0x000030, },
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{ .p_type = PT_NOTE, .p_vaddr = 0x00000368, .p_memsz = 0x000044, },
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{ .p_type = PT_GNU_PROPERTY, .p_vaddr = 0x00000338, .p_memsz = 0x000030, },
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{ .p_type = PT_GNU_EH_FRAME, .p_vaddr = 0x0000b490, .p_memsz = 0x0001ec, },
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{ .p_type = PT_GNU_STACK, .p_vaddr = 0x00000000, .p_memsz = 0x000000, },
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{ .p_type = PT_GNU_RELRO, .p_vaddr = 0x0000d330, .p_memsz = 0x000cd0, },
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};
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size_t mount_size = 0xE070;
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/* https://lore.kernel.org/linux-fsdevel/YfF18Dy85mCntXrx@fractal.localdomain */
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struct elf_phdr unordered[] = {
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{ .p_type = PT_LOAD, .p_vaddr = 0x00000000, .p_memsz = 0x0033a8, },
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{ .p_type = PT_LOAD, .p_vaddr = 0x0000d330, .p_memsz = 0x000d40, },
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{ .p_type = PT_LOAD, .p_vaddr = 0x00004000, .p_memsz = 0x005c91, },
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{ .p_type = PT_LOAD, .p_vaddr = 0x0000a000, .p_memsz = 0x0022f8, },
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};
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/* No headers, no size. */
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KUNIT_EXPECT_EQ(test, total_mapping_size(NULL, 0), 0);
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KUNIT_EXPECT_EQ(test, total_mapping_size(empty, 0), 0);
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/* Empty headers, no size. */
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KUNIT_EXPECT_EQ(test, total_mapping_size(empty, 1), 0);
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/* No PT_LOAD headers, no size. */
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KUNIT_EXPECT_EQ(test, total_mapping_size(&empty[1], 1), 0);
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/* Empty PT_LOAD and non-PT_LOAD headers, no size. */
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KUNIT_EXPECT_EQ(test, total_mapping_size(empty, 2), 0);
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/* Normal set of PT_LOADS, and expected size. */
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KUNIT_EXPECT_EQ(test, total_mapping_size(mount, ARRAY_SIZE(mount)), mount_size);
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/* Unordered PT_LOADs result in same size. */
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KUNIT_EXPECT_EQ(test, total_mapping_size(unordered, ARRAY_SIZE(unordered)), mount_size);
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}
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static struct kunit_case binfmt_elf_test_cases[] = {
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KUNIT_CASE(total_mapping_size_test),
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{},
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};
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static struct kunit_suite binfmt_elf_test_suite = {
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.name = KBUILD_MODNAME,
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.test_cases = binfmt_elf_test_cases,
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};
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kunit_test_suite(binfmt_elf_test_suite);
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