Commit 2c6401c9 authored by Jiri Olsa's avatar Jiri Olsa Committed by Alexei Starovoitov
Browse files

selftests/bpf: Add kprobe_multi bpf_cookie test 



Adding bpf_cookie test for programs attached by kprobe_multi links.

Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220316122419.933957-12-jolsa@kernel.org
parent f7a11eec

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

+109 −0
Original line number Diff line number Diff line
@@ -7,6 +7,7 @@ 
#include <unistd.h>

#include <test_progs.h>

#include "test_bpf_cookie.skel.h"

#include "kprobe_multi.skel.h"



/* uprobe attach point */

static void trigger_func(void)
@@ -63,6 +64,112 @@ static void kprobe_subtest(struct test_bpf_cookie *skel) 
	bpf_link__destroy(retlink2);

}



static void kprobe_multi_test_run(struct kprobe_multi *skel)

{

	LIBBPF_OPTS(bpf_test_run_opts, topts);

	int err, prog_fd;



	prog_fd = bpf_program__fd(skel->progs.trigger);

	err = bpf_prog_test_run_opts(prog_fd, &topts);

	ASSERT_OK(err, "test_run");

	ASSERT_EQ(topts.retval, 0, "test_run");



	ASSERT_EQ(skel->bss->kprobe_test1_result, 1, "kprobe_test1_result");

	ASSERT_EQ(skel->bss->kprobe_test2_result, 1, "kprobe_test2_result");

	ASSERT_EQ(skel->bss->kprobe_test3_result, 1, "kprobe_test3_result");

	ASSERT_EQ(skel->bss->kprobe_test4_result, 1, "kprobe_test4_result");

	ASSERT_EQ(skel->bss->kprobe_test5_result, 1, "kprobe_test5_result");

	ASSERT_EQ(skel->bss->kprobe_test6_result, 1, "kprobe_test6_result");

	ASSERT_EQ(skel->bss->kprobe_test7_result, 1, "kprobe_test7_result");

	ASSERT_EQ(skel->bss->kprobe_test8_result, 1, "kprobe_test8_result");



	ASSERT_EQ(skel->bss->kretprobe_test1_result, 1, "kretprobe_test1_result");

	ASSERT_EQ(skel->bss->kretprobe_test2_result, 1, "kretprobe_test2_result");

	ASSERT_EQ(skel->bss->kretprobe_test3_result, 1, "kretprobe_test3_result");

	ASSERT_EQ(skel->bss->kretprobe_test4_result, 1, "kretprobe_test4_result");

	ASSERT_EQ(skel->bss->kretprobe_test5_result, 1, "kretprobe_test5_result");

	ASSERT_EQ(skel->bss->kretprobe_test6_result, 1, "kretprobe_test6_result");

	ASSERT_EQ(skel->bss->kretprobe_test7_result, 1, "kretprobe_test7_result");

	ASSERT_EQ(skel->bss->kretprobe_test8_result, 1, "kretprobe_test8_result");

}



static void kprobe_multi_link_api_subtest(void)

{

	int prog_fd, link1_fd = -1, link2_fd = -1;

	struct kprobe_multi *skel = NULL;

	LIBBPF_OPTS(bpf_link_create_opts, opts);

	unsigned long long addrs[8];

	__u64 cookies[8];



	if (!ASSERT_OK(load_kallsyms(), "load_kallsyms"))

		goto cleanup;



	skel = kprobe_multi__open_and_load();

	if (!ASSERT_OK_PTR(skel, "fentry_raw_skel_load"))

		goto cleanup;



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

	skel->bss->test_cookie = true;



#define GET_ADDR(__sym, __addr) ({				\

	__addr = ksym_get_addr(__sym);				\

	if (!ASSERT_NEQ(__addr, 0, "ksym_get_addr " #__sym))	\

		goto cleanup;					\

})



	GET_ADDR("bpf_fentry_test1", addrs[0]);

	GET_ADDR("bpf_fentry_test2", addrs[1]);

	GET_ADDR("bpf_fentry_test3", addrs[2]);

	GET_ADDR("bpf_fentry_test4", addrs[3]);

	GET_ADDR("bpf_fentry_test5", addrs[4]);

	GET_ADDR("bpf_fentry_test6", addrs[5]);

	GET_ADDR("bpf_fentry_test7", addrs[6]);

	GET_ADDR("bpf_fentry_test8", addrs[7]);



#undef GET_ADDR



	cookies[0] = 1;

	cookies[1] = 2;

	cookies[2] = 3;

	cookies[3] = 4;

	cookies[4] = 5;

	cookies[5] = 6;

	cookies[6] = 7;

	cookies[7] = 8;



	opts.kprobe_multi.addrs = (const unsigned long *) &addrs;

	opts.kprobe_multi.cnt = ARRAY_SIZE(addrs);

	opts.kprobe_multi.cookies = (const __u64 *) &cookies;

	prog_fd = bpf_program__fd(skel->progs.test_kprobe);



	link1_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_KPROBE_MULTI, &opts);

	if (!ASSERT_GE(link1_fd, 0, "link1_fd"))

		goto cleanup;



	cookies[0] = 8;

	cookies[1] = 7;

	cookies[2] = 6;

	cookies[3] = 5;

	cookies[4] = 4;

	cookies[5] = 3;

	cookies[6] = 2;

	cookies[7] = 1;



	opts.kprobe_multi.flags = BPF_F_KPROBE_MULTI_RETURN;

	prog_fd = bpf_program__fd(skel->progs.test_kretprobe);



	link2_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_KPROBE_MULTI, &opts);

	if (!ASSERT_GE(link2_fd, 0, "link2_fd"))

		goto cleanup;



	kprobe_multi_test_run(skel);



cleanup:

	close(link1_fd);

	close(link2_fd);

	kprobe_multi__destroy(skel);

}



static void uprobe_subtest(struct test_bpf_cookie *skel)

{

	DECLARE_LIBBPF_OPTS(bpf_uprobe_opts, opts);
@@ -249,6 +356,8 @@ void test_bpf_cookie(void) 


	if (test__start_subtest("kprobe"))

		kprobe_subtest(skel);

	if (test__start_subtest("multi_kprobe_link_api"))

		kprobe_multi_link_api_subtest();

	if (test__start_subtest("uprobe"))

		uprobe_subtest(skel);

	if (test__start_subtest("tracepoint"))

tools/testing/selftests/bpf/progs/kprobe_multi.c

+22 −19
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ extern const void bpf_fentry_test7 __ksym; 
extern const void bpf_fentry_test8 __ksym;



int pid = 0;

bool test_cookie = false;



__u64 kprobe_test1_result = 0;

__u64 kprobe_test2_result = 0;
@@ -40,31 +41,33 @@ static void kprobe_multi_check(void *ctx, bool is_return) 
	if (bpf_get_current_pid_tgid() >> 32 != pid)

		return;



	__u64 cookie = test_cookie ? bpf_get_attach_cookie(ctx) : 0;

	__u64 addr = bpf_get_func_ip(ctx);



#define SET(__var, __addr) ({			\

	if ((const void *) addr == __addr) 	\

#define SET(__var, __addr, __cookie) ({			\

	if (((const void *) addr == __addr) &&		\

	     (!test_cookie || (cookie == __cookie)))	\

		__var = 1;				\

})



	if (is_return) {

		SET(kretprobe_test1_result, &bpf_fentry_test1);

		SET(kretprobe_test2_result, &bpf_fentry_test2);

		SET(kretprobe_test3_result, &bpf_fentry_test3);

		SET(kretprobe_test4_result, &bpf_fentry_test4);

		SET(kretprobe_test5_result, &bpf_fentry_test5);

		SET(kretprobe_test6_result, &bpf_fentry_test6);

		SET(kretprobe_test7_result, &bpf_fentry_test7);

		SET(kretprobe_test8_result, &bpf_fentry_test8);

		SET(kretprobe_test1_result, &bpf_fentry_test1, 8);

		SET(kretprobe_test2_result, &bpf_fentry_test2, 7);

		SET(kretprobe_test3_result, &bpf_fentry_test3, 6);

		SET(kretprobe_test4_result, &bpf_fentry_test4, 5);

		SET(kretprobe_test5_result, &bpf_fentry_test5, 4);

		SET(kretprobe_test6_result, &bpf_fentry_test6, 3);

		SET(kretprobe_test7_result, &bpf_fentry_test7, 2);

		SET(kretprobe_test8_result, &bpf_fentry_test8, 1);

	} else {

		SET(kprobe_test1_result, &bpf_fentry_test1);

		SET(kprobe_test2_result, &bpf_fentry_test2);

		SET(kprobe_test3_result, &bpf_fentry_test3);

		SET(kprobe_test4_result, &bpf_fentry_test4);

		SET(kprobe_test5_result, &bpf_fentry_test5);

		SET(kprobe_test6_result, &bpf_fentry_test6);

		SET(kprobe_test7_result, &bpf_fentry_test7);

		SET(kprobe_test8_result, &bpf_fentry_test8);

		SET(kprobe_test1_result, &bpf_fentry_test1, 1);

		SET(kprobe_test2_result, &bpf_fentry_test2, 2);

		SET(kprobe_test3_result, &bpf_fentry_test3, 3);

		SET(kprobe_test4_result, &bpf_fentry_test4, 4);

		SET(kprobe_test5_result, &bpf_fentry_test5, 5);

		SET(kprobe_test6_result, &bpf_fentry_test6, 6);

		SET(kprobe_test7_result, &bpf_fentry_test7, 7);

		SET(kprobe_test8_result, &bpf_fentry_test8, 8);

	}



#undef SET