tools/testing/selftests/bpf/prog_tests/bpf_cookie.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/prog_tests/bpf_cookie.c
Extension
.c
Size
22719 bytes
Lines
782
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

noinline __weak void uprobe_multi_func_1(void) { asm volatile (""); }
noinline __weak void uprobe_multi_func_2(void) { asm volatile (""); }
noinline __weak void uprobe_multi_func_3(void) { asm volatile (""); }

static void uprobe_multi_test_run(struct uprobe_multi *skel)
{
	skel->bss->uprobe_multi_func_1_addr = (__u64) uprobe_multi_func_1;
	skel->bss->uprobe_multi_func_2_addr = (__u64) uprobe_multi_func_2;
	skel->bss->uprobe_multi_func_3_addr = (__u64) uprobe_multi_func_3;

	skel->bss->pid = getpid();
	skel->bss->test_cookie = true;

	uprobe_multi_func_1();
	uprobe_multi_func_2();
	uprobe_multi_func_3();

	ASSERT_EQ(skel->bss->uprobe_multi_func_1_result, 1, "uprobe_multi_func_1_result");
	ASSERT_EQ(skel->bss->uprobe_multi_func_2_result, 1, "uprobe_multi_func_2_result");
	ASSERT_EQ(skel->bss->uprobe_multi_func_3_result, 1, "uprobe_multi_func_3_result");

	ASSERT_EQ(skel->bss->uretprobe_multi_func_1_result, 1, "uretprobe_multi_func_1_result");
	ASSERT_EQ(skel->bss->uretprobe_multi_func_2_result, 1, "uretprobe_multi_func_2_result");
	ASSERT_EQ(skel->bss->uretprobe_multi_func_3_result, 1, "uretprobe_multi_func_3_result");
}

static void uprobe_multi_attach_api_subtest(void)
{
	struct bpf_link *link1 = NULL, *link2 = NULL;
	struct uprobe_multi *skel = NULL;
	LIBBPF_OPTS(bpf_uprobe_multi_opts, opts);
	const char *syms[3] = {
		"uprobe_multi_func_1",
		"uprobe_multi_func_2",
		"uprobe_multi_func_3",
	};
	__u64 cookies[3];

	cookies[0] = 3; /* uprobe_multi_func_1 */
	cookies[1] = 1; /* uprobe_multi_func_2 */
	cookies[2] = 2; /* uprobe_multi_func_3 */

	opts.syms = syms;
	opts.cnt = ARRAY_SIZE(syms);
	opts.cookies = &cookies[0];

	skel = uprobe_multi__open_and_load();
	if (!ASSERT_OK_PTR(skel, "uprobe_multi"))
		goto cleanup;

	link1 = bpf_program__attach_uprobe_multi(skel->progs.uprobe, -1,
						 "/proc/self/exe", NULL, &opts);
	if (!ASSERT_OK_PTR(link1, "bpf_program__attach_uprobe_multi"))
		goto cleanup;

	cookies[0] = 2; /* uprobe_multi_func_1 */
	cookies[1] = 3; /* uprobe_multi_func_2 */
	cookies[2] = 1; /* uprobe_multi_func_3 */

	opts.retprobe = true;
	link2 = bpf_program__attach_uprobe_multi(skel->progs.uretprobe, -1,
						      "/proc/self/exe", NULL, &opts);
	if (!ASSERT_OK_PTR(link2, "bpf_program__attach_uprobe_multi_retprobe"))
		goto cleanup;

	uprobe_multi_test_run(skel);

cleanup:
	bpf_link__destroy(link2);
	bpf_link__destroy(link1);
	uprobe_multi__destroy(skel);
}

static void uprobe_subtest(struct test_bpf_cookie *skel)
{
	DECLARE_LIBBPF_OPTS(bpf_uprobe_opts, opts);
	struct bpf_link *link1 = NULL, *link2 = NULL;
	struct bpf_link *retlink1 = NULL, *retlink2 = NULL;
	ssize_t uprobe_offset;

	uprobe_offset = get_uprobe_offset(&trigger_func);
	if (!ASSERT_GE(uprobe_offset, 0, "uprobe_offset"))
		goto cleanup;

	/* attach two uprobes */
	opts.bpf_cookie = 0x100;
	opts.retprobe = false;
	link1 = bpf_program__attach_uprobe_opts(skel->progs.handle_uprobe, 0 /* self pid */,
						"/proc/self/exe", uprobe_offset, &opts);
	if (!ASSERT_OK_PTR(link1, "link1"))

Annotation

Implementation Notes