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Message-ID: <20250902143504.1224726-10-jolsa@kernel.org>
Date: Tue, 2 Sep 2025 16:35:02 +0200
From: Jiri Olsa <jolsa@...nel.org>
To: Oleg Nesterov <oleg@...hat.com>,
Masami Hiramatsu <mhiramat@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Andrii Nakryiko <andrii@...nel.org>
Cc: bpf@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-trace-kernel@...r.kernel.org,
x86@...nel.org,
Song Liu <songliubraving@...com>,
Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
Hao Luo <haoluo@...gle.com>,
Steven Rostedt <rostedt@...dmis.org>,
Ingo Molnar <mingo@...nel.org>
Subject: [PATCH perf/core 09/11] selftests/bpf: Add uprobe multi context ip register change test
Adding test to check we can change the application execution
through instruction pointer change through uprobe program.
It's x86_64 specific test.
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
.../bpf/prog_tests/uprobe_multi_test.c | 42 +++++++++++++++++++
.../selftests/bpf/progs/uprobe_multi.c | 14 +++++++
2 files changed, 56 insertions(+)
diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c
index 012652b07399..4630a6c65c3c 100644
--- a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c
+++ b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c
@@ -1437,10 +1437,52 @@ static void unique_regs_common(void)
uprobe_multi__destroy(skel);
}
+noinline static unsigned long uprobe_regs_change_ip_1(void)
+{
+ return 0xc0ffee;
+}
+
+noinline static unsigned long uprobe_regs_change_ip_2(void)
+{
+ return 0xdeadbeef;
+}
+
+static void unique_regs_ip(void)
+{
+ LIBBPF_OPTS(bpf_uprobe_multi_opts, opts,
+ .unique = true,
+ );
+ struct uprobe_multi *skel;
+ int ret;
+
+ skel = uprobe_multi__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "skel_open"))
+ return;
+
+ skel->bss->pid = getpid();
+ skel->bss->ip = (unsigned long) uprobe_regs_change_ip_2;
+
+ skel->links.uprobe_change_ip = bpf_program__attach_uprobe_multi(
+ skel->progs.uprobe_change_ip,
+ -1, "/proc/self/exe",
+ "uprobe_regs_change_ip_1",
+ &opts);
+ if (!ASSERT_OK_PTR(skel->links.uprobe_change_ip, "bpf_program__attach_uprobe_multi"))
+ goto cleanup;
+
+ ret = uprobe_regs_change_ip_1();
+ ASSERT_EQ(ret, 0xdeadbeef, "ret");
+
+cleanup:
+ uprobe_multi__destroy(skel);
+}
+
static void test_unique(void)
{
if (test__start_subtest("unique_regs_common"))
unique_regs_common();
+ if (test__start_subtest("unique_regs_ip"))
+ unique_regs_ip();
}
#else
static void test_unique(void) { }
diff --git a/tools/testing/selftests/bpf/progs/uprobe_multi.c b/tools/testing/selftests/bpf/progs/uprobe_multi.c
index f26f8b840985..563fd37ed77d 100644
--- a/tools/testing/selftests/bpf/progs/uprobe_multi.c
+++ b/tools/testing/selftests/bpf/progs/uprobe_multi.c
@@ -164,4 +164,18 @@ int BPF_UPROBE(uprobe_change_regs)
ctx->si = regs.si;
return 0;
}
+
+unsigned long ip;
+
+SEC("uprobe.unique")
+int BPF_UPROBE(uprobe_change_ip)
+{
+ pid_t cur_pid = bpf_get_current_pid_tgid() >> 32;
+
+ if (cur_pid != pid)
+ return 0;
+
+ ctx->ip = ip;
+ return 0;
+}
#endif
--
2.51.0
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