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selftests/bpf: Add uprobe session test

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Adding uprobe session test and testing that the entry program
return value controls execution of the return probe 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/20241108134544.480660-7-jolsa@kernel.org
This commit is contained in:
Jiri Olsa
2024-11-08 14:45:37 +01:00
committed by Andrii Nakryiko
parent 022367ec92
commit 4856ecb115
2 changed files with 118 additions and 0 deletions
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47
tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c
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@@ -8,6 +8,7 @@
#include "uprobe_multi_usdt.skel.h"
#include "uprobe_multi_consumers.skel.h"
#include "uprobe_multi_pid_filter.skel.h"
#include "uprobe_multi_session.skel.h"
#include "bpf/libbpf_internal.h"
#include "testing_helpers.h"
#include "../sdt.h"
@@ -1017,6 +1018,50 @@ static void test_pid_filter_process(bool clone_vm)
uprobe_multi_pid_filter__destroy(skel);
}
static void test_session_skel_api(void)
{
struct uprobe_multi_session *skel = NULL;
LIBBPF_OPTS(bpf_kprobe_multi_opts, opts);
struct bpf_link *link = NULL;
int err;
skel = uprobe_multi_session__open_and_load();
if (!ASSERT_OK_PTR(skel, "uprobe_multi_session__open_and_load"))
goto cleanup;
skel->bss->pid = getpid();
skel->bss->user_ptr = test_data;
err = uprobe_multi_session__attach(skel);
if (!ASSERT_OK(err, "uprobe_multi_session__attach"))
goto cleanup;
/* trigger all probes */
skel->bss->uprobe_multi_func_1_addr = (__u64) uprobe_multi_func_1;
skel->bss->uprobe_multi_func_2_addr = (__u64) uprobe_multi_func_2;
skel->bss->uprobe_multi_func_3_addr = (__u64) uprobe_multi_func_3;
uprobe_multi_func_1();
uprobe_multi_func_2();
uprobe_multi_func_3();
/*
* We expect 2 for uprobe_multi_func_2 because it runs both entry/return probe,
* uprobe_multi_func_[13] run just the entry probe. All expected numbers are
* doubled, because we run extra test for sleepable session.
*/
ASSERT_EQ(skel->bss->uprobe_session_result[0], 2, "uprobe_multi_func_1_result");
ASSERT_EQ(skel->bss->uprobe_session_result[1], 4, "uprobe_multi_func_2_result");
ASSERT_EQ(skel->bss->uprobe_session_result[2], 2, "uprobe_multi_func_3_result");
/* We expect increase in 3 entry and 1 return session calls -> 4 */
ASSERT_EQ(skel->bss->uprobe_multi_sleep_result, 4, "uprobe_multi_sleep_result");
cleanup:
bpf_link__destroy(link);
uprobe_multi_session__destroy(skel);
}
static void test_bench_attach_uprobe(void)
{
long attach_start_ns = 0, attach_end_ns = 0;
@@ -1113,4 +1158,6 @@ void test_uprobe_multi_test(void)
test_pid_filter_process(false);
if (test__start_subtest("filter_clone_vm"))
test_pid_filter_process(true);
if (test__start_subtest("session"))
test_session_skel_api();
}

71
tools/testing/selftests/bpf/progs/uprobe_multi_session.c Normal file
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@@ -0,0 +1,71 @@
// 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_multi_func_1_addr = 0;
__u64 uprobe_multi_func_2_addr = 0;
__u64 uprobe_multi_func_3_addr = 0;
__u64 uprobe_session_result[3] = {};
__u64 uprobe_multi_sleep_result = 0;
void *user_ptr = 0;
int pid = 0;
static int uprobe_multi_check(void *ctx, bool is_return)
{
const __u64 funcs[] = {
uprobe_multi_func_1_addr,
uprobe_multi_func_2_addr,
uprobe_multi_func_3_addr,
};
unsigned int i;
__u64 addr;
if (bpf_get_current_pid_tgid() >> 32 != pid)
return 1;
addr = bpf_get_func_ip(ctx);
for (i = 0; i < ARRAY_SIZE(funcs); i++) {
if (funcs[i] == addr) {
uprobe_session_result[i]++;
break;
}
}
/* only uprobe_multi_func_2 executes return probe */
if ((addr == uprobe_multi_func_1_addr) ||
(addr == uprobe_multi_func_3_addr))
return 1;
return 0;
}
SEC("uprobe.session//proc/self/exe:uprobe_multi_func_*")
int uprobe(struct pt_regs *ctx)
{
return uprobe_multi_check(ctx, bpf_session_is_return());
}
static __always_inline bool verify_sleepable_user_copy(void)
{
char data[9];
bpf_copy_from_user(data, sizeof(data), user_ptr);
return bpf_strncmp(data, sizeof(data), "test_data") == 0;
}
SEC("uprobe.session.s//proc/self/exe:uprobe_multi_func_*")
int uprobe_sleepable(struct pt_regs *ctx)
{
if (verify_sleepable_user_copy())
uprobe_multi_sleep_result++;
return uprobe_multi_check(ctx, bpf_session_is_return());
}