[PATCH 5.9 344/757] selftests: Remove fmod_ret from test_overhead

Greg Kroah-Hartman
2020-10-27T15:58:44Z

From: Toke Høiland-Jørgensen <toke@redhat.com>

[ Upstream commit b000def2e052fc8ddea31a18019f6ebe044defb3 ]

The test_overhead prog_test included an fmod_ret program that attached to
__set_task_comm() in the kernel. However, this function was never listed as
allowed for return modification, so this only worked because of the
verifier skipping tests when a trampoline already existed for the attach
point. Now that the verifier checks have been fixed, remove fmod_ret from
the test so it works again.

Fixes: 4eaf0b5c5e04 ("selftest/bpf: Fmod_ret prog and implement test_overhead as part of bench")
Acked-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
tools/testing/selftests/bpf/bench.c | 3 ---
.../testing/selftests/bpf/benchs/bench_rename.c | 17 -----------------
.../selftests/bpf/prog_tests/test_overhead.c | 14 +-------------
.../testing/selftests/bpf/progs/test_overhead.c | 6 ------
4 files changed, 1 insertion(+), 39 deletions(-)

diff --git a/tools/testing/selftests/bpf/bench.c b/tools/testing/selftests/bpf/bench.c
index 944ad4721c83c..da14eaac71d03 100644
--- a/tools/testing/selftests/bpf/bench.c
+++ b/tools/testing/selftests/bpf/bench.c
@@ -311,7 +311,6 @@ extern const struct bench bench_rename_kretprobe;
extern const struct bench bench_rename_rawtp;
extern const struct bench bench_rename_fentry;
extern const struct bench bench_rename_fexit;
-extern const struct bench bench_rename_fmodret;
extern const struct bench bench_trig_base;
extern const struct bench bench_trig_tp;
extern const struct bench bench_trig_rawtp;
@@ -332,7 +331,6 @@ static const struct bench *benchs[] = {
&bench_rename_rawtp,
&bench_rename_fentry,
&bench_rename_fexit,
- &bench_rename_fmodret,
&bench_trig_base,
&bench_trig_tp,
&bench_trig_rawtp,
@@ -462,4 +460,3 @@ int main(int argc, char **argv)

return 0;
}
-
diff --git a/tools/testing/selftests/bpf/benchs/bench_rename.c b/tools/testing/selftests/bpf/benchs/bench_rename.c
index e74cff40f4fea..a967674098ada 100644
--- a/tools/testing/selftests/bpf/benchs/bench_rename.c
+++ b/tools/testing/selftests/bpf/benchs/bench_rename.c
@@ -106,12 +106,6 @@ static void setup_fexit()
attach_bpf(ctx.skel->progs.prog5);
}

-static void setup_fmodret()
-{
- setup_ctx();
- attach_bpf(ctx.skel->progs.prog6);
-}
-
static void *consumer(void *input)
{
return NULL;
@@ -182,14 +176,3 @@ const struct bench bench_rename_fexit = {
.report_progress = hits_drops_report_progress,
.report_final = hits_drops_report_final,
};
-
-const struct bench bench_rename_fmodret = {
- .name = "rename-fmodret",
- .validate = validate,
- .setup = setup_fmodret,
- .producer_thread = producer,
- .consumer_thread = consumer,
- .measure = measure,
- .report_progress = hits_drops_report_progress,
- .report_final = hits_drops_report_final,
-};
diff --git a/tools/testing/selftests/bpf/prog_tests/test_overhead.c b/tools/testing/selftests/bpf/prog_tests/test_overhead.c
index 2702df2b23433..9966685866fdf 100644
--- a/tools/testing/selftests/bpf/prog_tests/test_overhead.c
+++ b/tools/testing/selftests/bpf/prog_tests/test_overhead.c
@@ -61,10 +61,9 @@ void test_test_overhead(void)
const char *raw_tp_name = "raw_tp/task_rename";
const char *fentry_name = "fentry/__set_task_comm";
const char *fexit_name = "fexit/__set_task_comm";
- const char *fmodret_name = "fmod_ret/__set_task_comm";
const char *kprobe_func = "__set_task_comm";
struct bpf_program *kprobe_prog, *kretprobe_prog, *raw_tp_prog;
- struct bpf_program *fentry_prog, *fexit_prog, *fmodret_prog;
+ struct bpf_program *fentry_prog, *fexit_prog;
struct bpf_object *obj;
struct bpf_link *link;
int err, duration = 0;
@@ -97,11 +96,6 @@ void test_test_overhead(void)
if (CHECK(!fexit_prog, "find_probe",
"prog '%s' not found\n", fexit_name))
goto cleanup;
- fmodret_prog = bpf_object__find_program_by_title(obj, fmodret_name);
- if (CHECK(!fmodret_prog, "find_probe",
- "prog '%s' not found\n", fmodret_name))
- goto cleanup;
-
err = bpf_object__load(obj);
if (CHECK(err, "obj_load", "err %d\n", err))
goto cleanup;
@@ -148,12 +142,6 @@ void test_test_overhead(void)
test_run("fexit");
bpf_link__destroy(link);

- /* attach fmod_ret */
- link = bpf_program__attach_trace(fmodret_prog);
- if (CHECK(IS_ERR(link), "attach fmod_ret", "err %ld\n", PTR_ERR(link)))
- goto cleanup;
- test_run("fmod_ret");
- bpf_link__destroy(link);
cleanup:
prctl(PR_SET_NAME, comm, 0L, 0L, 0L);
bpf_object__close(obj);
diff --git a/tools/testing/selftests/bpf/progs/test_overhead.c b/tools/testing/selftests/bpf/progs/test_overhead.c
index 42403d088abc9..abb7344b531f4 100644
--- a/tools/testing/selftests/bpf/progs/test_overhead.c
+++ b/tools/testing/selftests/bpf/progs/test_overhead.c
@@ -39,10 +39,4 @@ int BPF_PROG(prog5, struct task_struct *tsk, const char *buf, bool exec)
return 0;
}

-SEC("fmod_ret/__set_task_comm")
-int BPF_PROG(prog6, struct task_struct *tsk, const char *buf, bool exec)
-{
- return !tsk;
-}
-
char _license[] SEC("license") = "GPL";
--
2.25.1