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Message-Id: <20220104080943.113249-13-jolsa@kernel.org>
Date: Tue, 4 Jan 2022 09:09:42 +0100
From: Jiri Olsa <jolsa@...hat.com>
To: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Masami Hiramatsu <mhiramat@...nel.org>
Cc: netdev@...r.kernel.org, bpf@...r.kernel.org,
lkml <linux-kernel@...r.kernel.org>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...omium.org>,
Steven Rostedt <rostedt@...dmis.org>,
"Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 12/13] selftest/bpf: Add raw kprobe attach test
Adding raw kprobe attach test that uses new interface
to attach multiple kprobes with new kprobe link.
The test is attaching to bpf_fentry_test* functions and
single trampoline program to use bpf_prog_test_run to
trigger bpf_fentry_test* functions.
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
.../bpf/prog_tests/raw_kprobe_test.c | 92 +++++++++++++++++++
.../testing/selftests/bpf/progs/raw_kprobe.c | 58 ++++++++++++
2 files changed, 150 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/raw_kprobe_test.c
create mode 100644 tools/testing/selftests/bpf/progs/raw_kprobe.c
diff --git a/tools/testing/selftests/bpf/prog_tests/raw_kprobe_test.c b/tools/testing/selftests/bpf/prog_tests/raw_kprobe_test.c
new file mode 100644
index 000000000000..5ade44c57c9e
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/raw_kprobe_test.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <test_progs.h>
+#include "raw_kprobe.skel.h"
+#include "trace_helpers.h"
+
+static void test_skel_api(void)
+{
+ struct raw_kprobe *skel = NULL;
+ __u32 duration = 0, retval;
+ int err, prog_fd;
+
+ skel = raw_kprobe__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "raw_kprobe__open_and_load"))
+ goto cleanup;
+
+ err = raw_kprobe__attach(skel);
+ if (!ASSERT_OK(err, "raw_kprobe__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");
+
+ ASSERT_EQ(skel->bss->test2_result, 8, "test2_result");
+ ASSERT_EQ(skel->bss->test3_result, 8, "test3_result");
+
+cleanup:
+ raw_kprobe__destroy(skel);
+}
+
+static void test_link_api(void)
+{
+ DECLARE_LIBBPF_OPTS(bpf_link_create_opts, opts);
+ int err, prog_fd, link1_fd = -1, link2_fd = -1;
+ struct raw_kprobe *skel = NULL;
+ __u32 duration = 0, retval;
+ __u64 addrs[8];
+
+ skel = raw_kprobe__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "fentry_raw_skel_load"))
+ goto cleanup;
+
+ kallsyms_find("bpf_fentry_test1", &addrs[0]);
+ kallsyms_find("bpf_fentry_test2", &addrs[1]);
+ kallsyms_find("bpf_fentry_test3", &addrs[2]);
+ kallsyms_find("bpf_fentry_test4", &addrs[3]);
+ kallsyms_find("bpf_fentry_test5", &addrs[4]);
+ kallsyms_find("bpf_fentry_test6", &addrs[5]);
+ kallsyms_find("bpf_fentry_test7", &addrs[6]);
+ kallsyms_find("bpf_fentry_test8", &addrs[7]);
+
+ opts.kprobe.addrs = (__u64) addrs;
+ opts.kprobe.cnt = 8;
+
+ prog_fd = bpf_program__fd(skel->progs.test2);
+ link1_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_RAW_KPROBE, &opts);
+ if (!ASSERT_GE(link1_fd, 0, "link_fd"))
+ goto cleanup;
+
+ opts.flags = BPF_F_KPROBE_RETURN;
+ prog_fd = bpf_program__fd(skel->progs.test3);
+ link2_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_RAW_KPROBE, &opts);
+ if (!ASSERT_GE(link2_fd, 0, "link_fd"))
+ goto cleanup;
+
+ skel->bss->test2_result = 0;
+ skel->bss->test3_result = 0;
+
+ 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");
+
+ ASSERT_EQ(skel->bss->test2_result, 8, "test2_result");
+ ASSERT_EQ(skel->bss->test3_result, 8, "test3_result");
+
+cleanup:
+ if (link1_fd != -1)
+ close(link1_fd);
+ if (link2_fd != -1)
+ close(link2_fd);
+ raw_kprobe__destroy(skel);
+}
+
+void test_raw_kprobe_test(void)
+{
+ test_skel_api();
+ test_link_api();
+}
diff --git a/tools/testing/selftests/bpf/progs/raw_kprobe.c b/tools/testing/selftests/bpf/progs/raw_kprobe.c
new file mode 100644
index 000000000000..baf7086203f9
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/raw_kprobe.c
@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+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_fentry_test5 __ksym;
+extern const void bpf_fentry_test6 __ksym;
+extern const void bpf_fentry_test7 __ksym;
+extern const void bpf_fentry_test8 __ksym;
+
+/* No tests, just to trigger bpf_fentry_test* through tracing test_run */
+SEC("fentry/bpf_modify_return_test")
+int BPF_PROG(test1)
+{
+ return 0;
+}
+
+__u64 test2_result = 0;
+
+SEC("kprobe/bpf_fentry_test*")
+int test2(struct pt_regs *ctx)
+{
+ __u64 addr = bpf_get_func_ip(ctx);
+
+ test2_result += (const void *) addr == &bpf_fentry_test1 ||
+ (const void *) addr == &bpf_fentry_test2 ||
+ (const void *) addr == &bpf_fentry_test3 ||
+ (const void *) addr == &bpf_fentry_test4 ||
+ (const void *) addr == &bpf_fentry_test5 ||
+ (const void *) addr == &bpf_fentry_test6 ||
+ (const void *) addr == &bpf_fentry_test7 ||
+ (const void *) addr == &bpf_fentry_test8;
+ return 0;
+}
+
+__u64 test3_result = 0;
+
+SEC("kretprobe/bpf_fentry_test*")
+int test3(struct pt_regs *ctx)
+{
+ __u64 addr = bpf_get_func_ip(ctx);
+
+ test3_result += (const void *) addr == &bpf_fentry_test1 ||
+ (const void *) addr == &bpf_fentry_test2 ||
+ (const void *) addr == &bpf_fentry_test3 ||
+ (const void *) addr == &bpf_fentry_test4 ||
+ (const void *) addr == &bpf_fentry_test5 ||
+ (const void *) addr == &bpf_fentry_test6 ||
+ (const void *) addr == &bpf_fentry_test7 ||
+ (const void *) addr == &bpf_fentry_test8;
+ return 0;
+}
--
2.33.1
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