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selftest/bpf: Add kprobe_multi test for bpf_cookie values
Adding bpf_cookie test for programs attached by kprobe_multi links. Signed-off-by: Jiri Olsa <[email protected]>
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‎tools/testing/selftests/bpf/prog_tests/bpf_cookie.c

Lines changed: 72 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -7,6 +7,7 @@
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#include <unistd.h>
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#include <test_progs.h>
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#include "test_bpf_cookie.skel.h"
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#include "kprobe_multi_bpf_cookie.skel.h"
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/* uprobe attach point */
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static void trigger_func(void)
@@ -63,6 +64,75 @@ static void kprobe_subtest(struct test_bpf_cookie *skel)
6364
bpf_link__destroy(retlink2);
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}
6566

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static void kprobe_multi_subtest(void)
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{
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DECLARE_LIBBPF_OPTS(bpf_link_create_opts, opts);
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int err, prog_fd, link1_fd = -1, link2_fd = -1;
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LIBBPF_OPTS(bpf_test_run_opts, topts);
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struct kprobe_multi_bpf_cookie *skel = NULL;
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__u64 addrs[8], cookies[8];
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skel = kprobe_multi_bpf_cookie__open_and_load();
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if (!ASSERT_OK_PTR(skel, "fentry_raw_skel_load"))
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goto cleanup;
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kallsyms_find("bpf_fentry_test1", &addrs[0]);
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kallsyms_find("bpf_fentry_test2", &addrs[1]);
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kallsyms_find("bpf_fentry_test3", &addrs[2]);
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kallsyms_find("bpf_fentry_test4", &addrs[3]);
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kallsyms_find("bpf_fentry_test5", &addrs[4]);
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kallsyms_find("bpf_fentry_test6", &addrs[5]);
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kallsyms_find("bpf_fentry_test7", &addrs[6]);
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kallsyms_find("bpf_fentry_test8", &addrs[7]);
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cookies[0] = 1;
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cookies[1] = 2;
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cookies[2] = 3;
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cookies[3] = 4;
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cookies[4] = 5;
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cookies[5] = 6;
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cookies[6] = 7;
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cookies[7] = 8;
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opts.kprobe_multi.addrs = ptr_to_u64(&addrs);
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opts.kprobe_multi.cnt = 8;
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opts.kprobe_multi.cookies = ptr_to_u64(&cookies);
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prog_fd = bpf_program__fd(skel->progs.test2);
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link1_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_KPROBE_MULTI, &opts);
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if (!ASSERT_GE(link1_fd, 0, "link1_fd"))
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return;
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cookies[0] = 8;
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cookies[1] = 7;
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cookies[2] = 6;
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cookies[3] = 5;
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cookies[4] = 4;
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cookies[5] = 3;
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cookies[6] = 2;
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cookies[7] = 1;
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opts.flags = BPF_F_KPROBE_MULTI_RETURN;
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prog_fd = bpf_program__fd(skel->progs.test3);
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link2_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_KPROBE_MULTI, &opts);
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if (!ASSERT_GE(link2_fd, 0, "link2_fd"))
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goto cleanup;
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prog_fd = bpf_program__fd(skel->progs.test1);
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err = bpf_prog_test_run_opts(prog_fd, &topts);
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ASSERT_OK(err, "test_run");
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ASSERT_EQ(topts.retval, 0, "test_run");
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ASSERT_EQ(skel->bss->test2_result, 8, "test2_result");
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ASSERT_EQ(skel->bss->test3_result, 8, "test3_result");
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cleanup:
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close(link1_fd);
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close(link2_fd);
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kprobe_multi_bpf_cookie__destroy(skel);
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}
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static void uprobe_subtest(struct test_bpf_cookie *skel)
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{
68138
DECLARE_LIBBPF_OPTS(bpf_uprobe_opts, opts);
@@ -249,6 +319,8 @@ void test_bpf_cookie(void)
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250320
if (test__start_subtest("kprobe"))
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kprobe_subtest(skel);
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if (test__start_subtest("multi_kprobe"))
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kprobe_multi_subtest();
252324
if (test__start_subtest("uprobe"))
253325
uprobe_subtest(skel);
254326
if (test__start_subtest("tracepoint"))

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

Lines changed: 62 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,62 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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char _license[] SEC("license") = "GPL";
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extern const void bpf_fentry_test1 __ksym;
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extern const void bpf_fentry_test2 __ksym;
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extern const void bpf_fentry_test3 __ksym;
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extern const void bpf_fentry_test4 __ksym;
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extern const void bpf_fentry_test5 __ksym;
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extern const void bpf_fentry_test6 __ksym;
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extern const void bpf_fentry_test7 __ksym;
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extern const void bpf_fentry_test8 __ksym;
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/* No tests, just to trigger bpf_fentry_test* through tracing test_run */
18+
SEC("fentry/bpf_modify_return_test")
19+
int BPF_PROG(test1)
20+
{
21+
return 0;
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}
23+
24+
__u64 test2_result = 0;
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26+
SEC("kprobe.multi/bpf_fentry_tes??")
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int test2(struct pt_regs *ctx)
28+
{
29+
__u64 cookie = bpf_get_attach_cookie(ctx);
30+
__u64 addr = bpf_get_func_ip(ctx);
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32+
test2_result += (const void *) addr == &bpf_fentry_test1 && cookie == 1;
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test2_result += (const void *) addr == &bpf_fentry_test2 && cookie == 2;
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test2_result += (const void *) addr == &bpf_fentry_test3 && cookie == 3;
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test2_result += (const void *) addr == &bpf_fentry_test4 && cookie == 4;
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test2_result += (const void *) addr == &bpf_fentry_test5 && cookie == 5;
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test2_result += (const void *) addr == &bpf_fentry_test6 && cookie == 6;
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test2_result += (const void *) addr == &bpf_fentry_test7 && cookie == 7;
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test2_result += (const void *) addr == &bpf_fentry_test8 && cookie == 8;
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return 0;
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}
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__u64 test3_result = 0;
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46+
SEC("kretprobe.multi/bpf_fentry_test*")
47+
int test3(struct pt_regs *ctx)
48+
{
49+
__u64 cookie = bpf_get_attach_cookie(ctx);
50+
__u64 addr = bpf_get_func_ip(ctx);
51+
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test3_result += (const void *) addr == &bpf_fentry_test1 && cookie == 8;
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test3_result += (const void *) addr == &bpf_fentry_test2 && cookie == 7;
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test3_result += (const void *) addr == &bpf_fentry_test3 && cookie == 6;
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test3_result += (const void *) addr == &bpf_fentry_test4 && cookie == 5;
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test3_result += (const void *) addr == &bpf_fentry_test5 && cookie == 4;
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test3_result += (const void *) addr == &bpf_fentry_test6 && cookie == 3;
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test3_result += (const void *) addr == &bpf_fentry_test7 && cookie == 2;
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test3_result += (const void *) addr == &bpf_fentry_test8 && cookie == 1;
60+
61+
return 0;
62+
}

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