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authorKees Cook <keescook@chromium.org>2022-02-23 19:32:10 -0800
committerKees Cook <keescook@chromium.org>2022-03-03 20:38:56 -0800
commit9e1a3ce0a952450a1163cc93ab1df6d4fa8c8155 (patch)
treecb6df50436b43afd7c5ea497c81521a26291df19 /fs/binfmt_elf_test.c
parent4f0bfdfd8323e5b461fc1042143a1097dba9fced (diff)
binfmt_elf: Introduce KUnit test
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)
Diffstat (limited to 'fs/binfmt_elf_test.c')
-rw-r--r--fs/binfmt_elf_test.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/fs/binfmt_elf_test.c b/fs/binfmt_elf_test.c
new file mode 100644
index 000000000000..11d734fec366
--- /dev/null
+++ b/fs/binfmt_elf_test.c
@@ -0,0 +1,64 @@
+// 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);