From 5d8b583d04aedb3bd5f6d227a334c210c7d735f9 Mon Sep 17 00:00:00 2001 From: Jiri Olsa Date: Wed, 14 Jul 2021 11:43:57 +0200 Subject: [PATCH] selftests/bpf: Add test for bpf_get_func_ip helper Adding test for bpf_get_func_ip helper for fentry, fexit, kprobe, kretprobe and fmod_ret programs. Signed-off-by: Jiri Olsa Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20210714094400.396467-6-jolsa@kernel.org --- .../bpf/prog_tests/get_func_ip_test.c | 39 ++++++++++++ .../selftests/bpf/progs/get_func_ip_test.c | 62 +++++++++++++++++++ 2 files changed, 101 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/get_func_ip_test.c create mode 100644 tools/testing/selftests/bpf/progs/get_func_ip_test.c diff --git a/tools/testing/selftests/bpf/prog_tests/get_func_ip_test.c b/tools/testing/selftests/bpf/prog_tests/get_func_ip_test.c new file mode 100644 index 00000000000000..8bb18a8d31a060 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/get_func_ip_test.c @@ -0,0 +1,39 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include "get_func_ip_test.skel.h" + +void test_get_func_ip_test(void) +{ + struct get_func_ip_test *skel = NULL; + __u32 duration = 0, retval; + int err, prog_fd; + + skel = get_func_ip_test__open_and_load(); + if (!ASSERT_OK_PTR(skel, "get_func_ip_test__open_and_load")) + return; + + err = get_func_ip_test__attach(skel); + if (!ASSERT_OK(err, "get_func_ip_test__attach")) + goto cleanup; + + prog_fd = bpf_program__fd(skel->progs.test1); + err = bpf_prog_test_run(prog_fd, 1, NULL, 0, + NULL, NULL, &retval, &duration); + ASSERT_OK(err, "test_run"); + ASSERT_EQ(retval, 0, "test_run"); + + prog_fd = bpf_program__fd(skel->progs.test5); + err = bpf_prog_test_run(prog_fd, 1, NULL, 0, + NULL, NULL, &retval, &duration); + + ASSERT_OK(err, "test_run"); + + ASSERT_EQ(skel->bss->test1_result, 1, "test1_result"); + ASSERT_EQ(skel->bss->test2_result, 1, "test2_result"); + ASSERT_EQ(skel->bss->test3_result, 1, "test3_result"); + ASSERT_EQ(skel->bss->test4_result, 1, "test4_result"); + ASSERT_EQ(skel->bss->test5_result, 1, "test5_result"); + +cleanup: + get_func_ip_test__destroy(skel); +} diff --git a/tools/testing/selftests/bpf/progs/get_func_ip_test.c b/tools/testing/selftests/bpf/progs/get_func_ip_test.c new file mode 100644 index 00000000000000..ba3e107b52dd47 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/get_func_ip_test.c @@ -0,0 +1,62 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include + +char _license[] SEC("license") = "GPL"; + +extern const void bpf_fentry_test1 __ksym; +extern const void bpf_fentry_test2 __ksym; +extern const void bpf_fentry_test3 __ksym; +extern const void bpf_fentry_test4 __ksym; +extern const void bpf_modify_return_test __ksym; + +__u64 test1_result = 0; +SEC("fentry/bpf_fentry_test1") +int BPF_PROG(test1, int a) +{ + __u64 addr = bpf_get_func_ip(ctx); + + test1_result = (const void *) addr == &bpf_fentry_test1; + return 0; +} + +__u64 test2_result = 0; +SEC("fexit/bpf_fentry_test2") +int BPF_PROG(test2, int a) +{ + __u64 addr = bpf_get_func_ip(ctx); + + test2_result = (const void *) addr == &bpf_fentry_test2; + return 0; +} + +__u64 test3_result = 0; +SEC("kprobe/bpf_fentry_test3") +int test3(struct pt_regs *ctx) +{ + __u64 addr = bpf_get_func_ip(ctx); + + test3_result = (const void *) addr == &bpf_fentry_test3; + return 0; +} + +__u64 test4_result = 0; +SEC("kretprobe/bpf_fentry_test4") +int BPF_KRETPROBE(test4) +{ + __u64 addr = bpf_get_func_ip(ctx); + + test4_result = (const void *) addr == &bpf_fentry_test4; + return 0; +} + +__u64 test5_result = 0; +SEC("fmod_ret/bpf_modify_return_test") +int BPF_PROG(test5, int a, int *b, int ret) +{ + __u64 addr = bpf_get_func_ip(ctx); + + test5_result = (const void *) addr == &bpf_modify_return_test; + return ret; +}