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selftests/bpf: Add uprobe multi pid filter test for fork-ed processes

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The idea is to create and monitor 3 uprobes, each trigered in separate
process and make sure the bpf program gets executed just for the proper
PID specified via pid filter.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240905115124.1503998-4-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2024-09-05 14:51:23 +03:00 committed by Andrii Nakryiko
parent 0b0bb45371
commit 8df43e8594
2 changed files with 107 additions and 0 deletions
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67
tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c
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@ -7,6 +7,7 @@
#include "uprobe_multi_bench.skel.h"
#include "uprobe_multi_usdt.skel.h"
#include "uprobe_multi_consumers.skel.h"
#include "uprobe_multi_pid_filter.skel.h"
#include "bpf/libbpf_internal.h"
#include "testing_helpers.h"
#include "../sdt.h"
@ -935,6 +936,70 @@ static void test_consumers(void)
uprobe_multi_consumers__destroy(skel);
}
static struct bpf_program *uprobe_multi_program(struct uprobe_multi_pid_filter *skel, int idx)
{
switch (idx) {
case 0: return skel->progs.uprobe_multi_0;
case 1: return skel->progs.uprobe_multi_1;
case 2: return skel->progs.uprobe_multi_2;
}
return NULL;
}
#define TASKS 3
static void run_pid_filter(struct uprobe_multi_pid_filter *skel, bool retprobe)
{
LIBBPF_OPTS(bpf_uprobe_multi_opts, opts, .retprobe = retprobe);
struct bpf_link *link[TASKS] = {};
struct child child[TASKS] = {};
int i;
memset(skel->bss->test, 0, sizeof(skel->bss->test));
for (i = 0; i < TASKS; i++) {
if (!ASSERT_OK(spawn_child(&child[i]), "spawn_child"))
goto cleanup;
skel->bss->pids[i] = child[i].pid;
}
for (i = 0; i < TASKS; i++) {
link[i] = bpf_program__attach_uprobe_multi(uprobe_multi_program(skel, i),
child[i].pid, "/proc/self/exe",
"uprobe_multi_func_1", &opts);
if (!ASSERT_OK_PTR(link[i], "bpf_program__attach_uprobe_multi"))
goto cleanup;
}
for (i = 0; i < TASKS; i++)
kick_child(&child[i]);
for (i = 0; i < TASKS; i++) {
ASSERT_EQ(skel->bss->test[i][0], 1, "pid");
ASSERT_EQ(skel->bss->test[i][1], 0, "unknown");
}
cleanup:
for (i = 0; i < TASKS; i++)
bpf_link__destroy(link[i]);
for (i = 0; i < TASKS; i++)
release_child(&child[i]);
}
static void test_pid_filter_process(void)
{
struct uprobe_multi_pid_filter *skel;
skel = uprobe_multi_pid_filter__open_and_load();
if (!ASSERT_OK_PTR(skel, "uprobe_multi_pid_filter__open_and_load"))
return;
run_pid_filter(skel, false);
run_pid_filter(skel, true);
uprobe_multi_pid_filter__destroy(skel);
}
static void test_bench_attach_uprobe(void)
{
long attach_start_ns = 0, attach_end_ns = 0;
@ -1027,4 +1092,6 @@ void test_uprobe_multi_test(void)
test_attach_uprobe_fails();
if (test__start_subtest("consumers"))
test_consumers();
if (test__start_subtest("filter_fork"))
test_pid_filter_process();
}

40
tools/testing/selftests/bpf/progs/uprobe_multi_pid_filter.c Normal file
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@ -0,0 +1,40 @@
// SPDX-License-Identifier: GPL-2.0
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
char _license[] SEC("license") = "GPL";
__u32 pids[3];
__u32 test[3][2];
static void update_pid(int idx)
{
__u32 pid = bpf_get_current_pid_tgid() >> 32;
if (pid == pids[idx])
test[idx][0]++;
else
test[idx][1]++;
}
SEC("uprobe.multi")
int uprobe_multi_0(struct pt_regs *ctx)
{
update_pid(0);
return 0;
}
SEC("uprobe.multi")
int uprobe_multi_1(struct pt_regs *ctx)
{
update_pid(1);
return 0;
}
SEC("uprobe.multi")
int uprobe_multi_2(struct pt_regs *ctx)
{
update_pid(2);
return 0;
}