mirror of
https://github.com/torvalds/linux.git
synced 2025-10-31 16:48:26 +02:00
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
|
|
#include <kunit/test.h>
|
|
|
|
static void total_mapping_size_test(struct kunit *test)
|
|
{
|
|
struct elf_phdr empty[] = {
|
|
{ .p_type = PT_LOAD, .p_vaddr = 0, .p_memsz = 0, },
|
|
{ .p_type = PT_INTERP, .p_vaddr = 10, .p_memsz = 999999, },
|
|
};
|
|
/*
|
|
* readelf -lW /bin/mount | grep '^ .*0x0' | awk '{print "\t\t{ .p_type = PT_" \
|
|
* $1 ", .p_vaddr = " $3 ", .p_memsz = " $6 ", },"}'
|
|
*/
|
|
struct elf_phdr mount[] = {
|
|
{ .p_type = PT_PHDR, .p_vaddr = 0x00000040, .p_memsz = 0x0002d8, },
|
|
{ .p_type = PT_INTERP, .p_vaddr = 0x00000318, .p_memsz = 0x00001c, },
|
|
{ .p_type = PT_LOAD, .p_vaddr = 0x00000000, .p_memsz = 0x0033a8, },
|
|
{ .p_type = PT_LOAD, .p_vaddr = 0x00004000, .p_memsz = 0x005c91, },
|
|
{ .p_type = PT_LOAD, .p_vaddr = 0x0000a000, .p_memsz = 0x0022f8, },
|
|
{ .p_type = PT_LOAD, .p_vaddr = 0x0000d330, .p_memsz = 0x000d40, },
|
|
{ .p_type = PT_DYNAMIC, .p_vaddr = 0x0000d928, .p_memsz = 0x000200, },
|
|
{ .p_type = PT_NOTE, .p_vaddr = 0x00000338, .p_memsz = 0x000030, },
|
|
{ .p_type = PT_NOTE, .p_vaddr = 0x00000368, .p_memsz = 0x000044, },
|
|
{ .p_type = PT_GNU_PROPERTY, .p_vaddr = 0x00000338, .p_memsz = 0x000030, },
|
|
{ .p_type = PT_GNU_EH_FRAME, .p_vaddr = 0x0000b490, .p_memsz = 0x0001ec, },
|
|
{ .p_type = PT_GNU_STACK, .p_vaddr = 0x00000000, .p_memsz = 0x000000, },
|
|
{ .p_type = PT_GNU_RELRO, .p_vaddr = 0x0000d330, .p_memsz = 0x000cd0, },
|
|
};
|
|
size_t mount_size = 0xE070;
|
|
/* https://lore.kernel.org/linux-fsdevel/YfF18Dy85mCntXrx@fractal.localdomain */
|
|
struct elf_phdr unordered[] = {
|
|
{ .p_type = PT_LOAD, .p_vaddr = 0x00000000, .p_memsz = 0x0033a8, },
|
|
{ .p_type = PT_LOAD, .p_vaddr = 0x0000d330, .p_memsz = 0x000d40, },
|
|
{ .p_type = PT_LOAD, .p_vaddr = 0x00004000, .p_memsz = 0x005c91, },
|
|
{ .p_type = PT_LOAD, .p_vaddr = 0x0000a000, .p_memsz = 0x0022f8, },
|
|
};
|
|
|
|
/* No headers, no size. */
|
|
KUNIT_EXPECT_EQ(test, total_mapping_size(NULL, 0), 0);
|
|
KUNIT_EXPECT_EQ(test, total_mapping_size(empty, 0), 0);
|
|
/* Empty headers, no size. */
|
|
KUNIT_EXPECT_EQ(test, total_mapping_size(empty, 1), 0);
|
|
/* No PT_LOAD headers, no size. */
|
|
KUNIT_EXPECT_EQ(test, total_mapping_size(&empty[1], 1), 0);
|
|
/* Empty PT_LOAD and non-PT_LOAD headers, no size. */
|
|
KUNIT_EXPECT_EQ(test, total_mapping_size(empty, 2), 0);
|
|
|
|
/* Normal set of PT_LOADS, and expected size. */
|
|
KUNIT_EXPECT_EQ(test, total_mapping_size(mount, ARRAY_SIZE(mount)), mount_size);
|
|
/* Unordered PT_LOADs result in same size. */
|
|
KUNIT_EXPECT_EQ(test, total_mapping_size(unordered, ARRAY_SIZE(unordered)), mount_size);
|
|
}
|
|
|
|
static struct kunit_case binfmt_elf_test_cases[] = {
|
|
KUNIT_CASE(total_mapping_size_test),
|
|
{},
|
|
};
|
|
|
|
static struct kunit_suite binfmt_elf_test_suite = {
|
|
.name = KBUILD_MODNAME,
|
|
.test_cases = binfmt_elf_test_cases,
|
|
};
|
|
|
|
kunit_test_suite(binfmt_elf_test_suite);
|