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selftests/bpf: Add kprobe session cookie test

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Adding kprobe 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/20240430112830.1184228-8-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2024-04-30 13:28:30 +02:00 • committed by Andrii Nakryiko
parent 0983b1697a
commit a3a5113393
3 changed files with 94 additions and 0 deletions
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1
tools/testing/selftests/bpf/bpf_kfuncs.h
View file

@ -77,4 +77,5 @@ extern int bpf_verify_pkcs7_signature(struct bpf_dynptr *data_ptr,
struct bpf_key *trusted_keyring) __ksym;
extern bool bpf_session_is_return(void) __ksym __weak;
extern long *bpf_session_cookie(void) __ksym __weak;
#endif

35
tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c
View file

@ -5,6 +5,7 @@
#include "kprobe_multi_empty.skel.h"
#include "kprobe_multi_override.skel.h"
#include "kprobe_multi_session.skel.h"
#include "kprobe_multi_session_cookie.skel.h"
#include "bpf/libbpf_internal.h"
#include "bpf/hashmap.h"
@ -363,6 +364,38 @@ cleanup:
kprobe_multi_session__destroy(skel);
}
static void test_session_cookie_skel_api(void)
{
struct kprobe_multi_session_cookie *skel = NULL;
LIBBPF_OPTS(bpf_kprobe_multi_opts, opts);
LIBBPF_OPTS(bpf_test_run_opts, topts);
struct bpf_link *link = NULL;
int err, prog_fd;
skel = kprobe_multi_session_cookie__open_and_load();
if (!ASSERT_OK_PTR(skel, "fentry_raw_skel_load"))
return;
skel->bss->pid = getpid();
err = kprobe_multi_session_cookie__attach(skel);
if (!ASSERT_OK(err, " kprobe_multi_wrapper__attach"))
goto cleanup;
prog_fd = bpf_program__fd(skel->progs.trigger);
err = bpf_prog_test_run_opts(prog_fd, &topts);
ASSERT_OK(err, "test_run");
ASSERT_EQ(topts.retval, 0, "test_run");
ASSERT_EQ(skel->bss->test_kprobe_1_result, 1, "test_kprobe_1_result");
ASSERT_EQ(skel->bss->test_kprobe_2_result, 2, "test_kprobe_2_result");
ASSERT_EQ(skel->bss->test_kprobe_3_result, 3, "test_kprobe_3_result");
cleanup:
bpf_link__destroy(link);
kprobe_multi_session_cookie__destroy(skel);
}
static size_t symbol_hash(long key, void *ctx __maybe_unused)
{
return str_hash((const char *) key);
@ -729,4 +762,6 @@ void test_kprobe_multi_test(void)
test_attach_override();
if (test__start_subtest("session"))
test_session_skel_api();
if (test__start_subtest("session_cookie"))
test_session_cookie_skel_api();
}

58
tools/testing/selftests/bpf/progs/kprobe_multi_session_cookie.c Normal file
View file

@ -0,0 +1,58 @@
// 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_kprobe_1_result = 0;
__u64 test_kprobe_2_result = 0;
__u64 test_kprobe_3_result = 0;
/*
* No tests in here, just to trigger 'bpf_fentry_test*'
* through tracing test_run
*/
SEC("fentry/bpf_modify_return_test")
int BPF_PROG(trigger)
{
return 0;
}
static int check_cookie(__u64 val, __u64 *result)
{
long *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("kprobe.session/bpf_fentry_test1")
int test_kprobe_1(struct pt_regs *ctx)
{
return check_cookie(1, &test_kprobe_1_result);
}
SEC("kprobe.session/bpf_fentry_test1")
int test_kprobe_2(struct pt_regs *ctx)
{
return check_cookie(2, &test_kprobe_2_result);
}
SEC("kprobe.session/bpf_fentry_test1")
int test_kprobe_3(struct pt_regs *ctx)
{
return check_cookie(3, &test_kprobe_3_result);
}