Adding test to check we can't attach kprobe multi program
that writes to the context.
It's x86_64 specific test.
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
.../bpf/prog_tests/kprobe_multi_test.c | 27 +++++++++++++++++++
.../selftests/bpf/progs/kprobe_write_ctx.c | 7 +++++
2 files changed, 34 insertions(+)
diff --git a/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c b/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c
index 171706e78da8..6cfaa978bc9a 100644
--- a/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c
+++ b/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c
@@ -7,6 +7,7 @@
#include "kprobe_multi_session.skel.h"
#include "kprobe_multi_session_cookie.skel.h"
#include "kprobe_multi_verifier.skel.h"
+#include "kprobe_write_ctx.skel.h"
#include "bpf/libbpf_internal.h"
#include "bpf/hashmap.h"
@@ -539,6 +540,30 @@ static void test_attach_override(void)
kprobe_multi_override__destroy(skel);
}
+#ifdef __x86_64__
+static void test_attach_write_ctx(void)
+{
+ struct kprobe_write_ctx *skel = NULL;
+ struct bpf_link *link = NULL;
+
+ skel = kprobe_write_ctx__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "kprobe_write_ctx__open_and_load"))
+ return;
+
+ link = bpf_program__attach_kprobe_opts(skel->progs.kprobe_multi_write_ctx,
+ "bpf_fentry_test1", NULL);
+ if (!ASSERT_ERR_PTR(link, "bpf_program__attach_kprobe_opts"))
+ bpf_link__destroy(link);
+
+ kprobe_write_ctx__destroy(skel);
+}
+#else
+static void test_attach_write_ctx(void)
+{
+ test__skip();
+}
+#endif
+
void serial_test_kprobe_multi_bench_attach(void)
{
if (test__start_subtest("kernel"))
@@ -578,5 +603,7 @@ void test_kprobe_multi_test(void)
test_session_cookie_skel_api();
if (test__start_subtest("unique_match"))
test_unique_match();
+ if (test__start_subtest("attach_write_ctx"))
+ test_attach_write_ctx();
RUN_TESTS(kprobe_multi_verifier);
}
diff --git a/tools/testing/selftests/bpf/progs/kprobe_write_ctx.c b/tools/testing/selftests/bpf/progs/kprobe_write_ctx.c
index 4621a5bef4e2..f77aef0474d3 100644
--- a/tools/testing/selftests/bpf/progs/kprobe_write_ctx.c
+++ b/tools/testing/selftests/bpf/progs/kprobe_write_ctx.c
@@ -12,4 +12,11 @@ int kprobe_write_ctx(struct pt_regs *ctx)
ctx->ax = 0;
return 0;
}
+
+SEC("kprobe.multi")
+int kprobe_multi_write_ctx(struct pt_regs *ctx)
+{
+ ctx->ax = 0;
+ return 0;
+}
#endif
--
2.51.0