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selftests/bpf: Add uprobe session cookie test

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Adding uprobe session test that verifies the cookie value
get properly propagated from entry to return program.

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/20241108134544.480660-8-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2024-11-08 14:45:38 +01:00 committed by Andrii Nakryiko
parent 4856ecb115
commit f6b45e352f
2 changed files with 79 additions and 0 deletions
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31
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_cookie.skel.h"
#include "bpf/libbpf_internal.h"
#include "testing_helpers.h"
#include "../sdt.h"
@ -1062,6 +1063,34 @@ static void test_session_skel_api(void)
uprobe_multi_session__destroy(skel);
}
static void test_session_cookie_skel_api(void)
{
struct uprobe_multi_session_cookie *skel = NULL;
int err;
skel = uprobe_multi_session_cookie__open_and_load();
if (!ASSERT_OK_PTR(skel, "uprobe_multi_session_cookie__open_and_load"))
goto cleanup;
skel->bss->pid = getpid();
err = uprobe_multi_session_cookie__attach(skel);
if (!ASSERT_OK(err, "uprobe_multi_session_cookie__attach"))
goto cleanup;
/* trigger all probes */
uprobe_multi_func_1();
uprobe_multi_func_2();
uprobe_multi_func_3();
ASSERT_EQ(skel->bss->test_uprobe_1_result, 1, "test_uprobe_1_result");
ASSERT_EQ(skel->bss->test_uprobe_2_result, 2, "test_uprobe_2_result");
ASSERT_EQ(skel->bss->test_uprobe_3_result, 3, "test_uprobe_3_result");
cleanup:
uprobe_multi_session_cookie__destroy(skel);
}
static void test_bench_attach_uprobe(void)
{
long attach_start_ns = 0, attach_end_ns = 0;
@ -1160,4 +1189,6 @@ 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_cookie"))
test_session_cookie_skel_api();
}

48
tools/testing/selftests/bpf/progs/uprobe_multi_session_cookie.c Normal file
View File

@ -0,0 +1,48 @@
// 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"
char _license[] SEC("license") = "GPL";
int pid = 0;
__u64 test_uprobe_1_result = 0;
__u64 test_uprobe_2_result = 0;
__u64 test_uprobe_3_result = 0;
static int check_cookie(__u64 val, __u64 *result)
{
__u64 *cookie;
if (bpf_get_current_pid_tgid() >> 32 != pid)
return 1;
cookie = bpf_session_cookie();
if (bpf_session_is_return())
*result = *cookie == val ? val : 0;
else
*cookie = val;
return 0;
}
SEC("uprobe.session//proc/self/exe:uprobe_multi_func_1")
int uprobe_1(struct pt_regs *ctx)
{
return check_cookie(1, &test_uprobe_1_result);
}
SEC("uprobe.session//proc/self/exe:uprobe_multi_func_2")
int uprobe_2(struct pt_regs *ctx)
{
return check_cookie(2, &test_uprobe_2_result);
}
SEC("uprobe.session//proc/self/exe:uprobe_multi_func_3")
int uprobe_3(struct pt_regs *ctx)
{
return check_cookie(3, &test_uprobe_3_result);
}