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selftests/bpf: Add uprobe session single consumer test

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Testing that the session ret_handler bypass works on single
uprobe with multiple consumers, each with different session
ignore return value.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20241108134544.480660-12-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2024-11-08 14:45:42 +01:00 committed by Andrii Nakryiko
parent 504d21d905
commit c574bcd622
2 changed files with 77 additions and 0 deletions
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33
tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c
View File

@ -9,6 +9,7 @@
#include "uprobe_multi_consumers.skel.h"
#include "uprobe_multi_pid_filter.skel.h"
#include "uprobe_multi_session.skel.h"
#include "uprobe_multi_session_single.skel.h"
#include "uprobe_multi_session_cookie.skel.h"
#include "uprobe_multi_session_recursive.skel.h"
#include "uprobe_multi_verifier.skel.h"
@ -1071,6 +1072,36 @@ static void test_session_skel_api(void)
uprobe_multi_session__destroy(skel);
}
static void test_session_single_skel_api(void)
{
struct uprobe_multi_session_single *skel = NULL;
LIBBPF_OPTS(bpf_kprobe_multi_opts, opts);
int err;
skel = uprobe_multi_session_single__open_and_load();
if (!ASSERT_OK_PTR(skel, "uprobe_multi_session_single__open_and_load"))
goto cleanup;
skel->bss->pid = getpid();
err = uprobe_multi_session_single__attach(skel);
if (!ASSERT_OK(err, "uprobe_multi_session_single__attach"))
goto cleanup;
uprobe_multi_func_1();
/*
* We expect consumer 0 and 2 to trigger just entry handler (value 1)
* and consumer 1 to hit both (value 2).
*/
ASSERT_EQ(skel->bss->uprobe_session_result[0], 1, "uprobe_session_result_0");
ASSERT_EQ(skel->bss->uprobe_session_result[1], 2, "uprobe_session_result_1");
ASSERT_EQ(skel->bss->uprobe_session_result[2], 1, "uprobe_session_result_2");
cleanup:
uprobe_multi_session_single__destroy(skel);
}
static void test_session_cookie_skel_api(void)
{
struct uprobe_multi_session_cookie *skel = NULL;
@ -1245,6 +1276,8 @@ void test_uprobe_multi_test(void)
test_pid_filter_process(true);
if (test__start_subtest("session"))
test_session_skel_api();
if (test__start_subtest("session_single"))
test_session_single_skel_api();
if (test__start_subtest("session_cookie"))
test_session_cookie_skel_api();
if (test__start_subtest("session_cookie_recursive"))

44
tools/testing/selftests/bpf/progs/uprobe_multi_session_single.c Normal file
View File

@ -0,0 +1,44 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <stdbool.h>
#include "bpf_kfuncs.h"
#include "bpf_misc.h"
char _license[] SEC("license") = "GPL";
__u64 uprobe_session_result[3] = {};
int pid = 0;
static int uprobe_multi_check(void *ctx, int idx)
{
if (bpf_get_current_pid_tgid() >> 32 != pid)
return 1;
uprobe_session_result[idx]++;
/* only consumer 1 executes return probe */
if (idx == 0 || idx == 2)
return 1;
return 0;
}
SEC("uprobe.session//proc/self/exe:uprobe_multi_func_1")
int uprobe_0(struct pt_regs *ctx)
{
return uprobe_multi_check(ctx, 0);
}
SEC("uprobe.session//proc/self/exe:uprobe_multi_func_1")
int uprobe_1(struct pt_regs *ctx)
{
return uprobe_multi_check(ctx, 1);
}
SEC("uprobe.session//proc/self/exe:uprobe_multi_func_1")
int uprobe_2(struct pt_regs *ctx)
{
return uprobe_multi_check(ctx, 2);
}