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selftests/bpf: Add kprobe_multi kmod attach api tests

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Adding kprobe_multi kmod attach api tests that attach bpf_testmod
functions via bpf_program__attach_kprobe_multi_opts.

Running it as serial test, because we don't want other tests to
reload bpf_testmod while it's running.

Acked-by: Song Liu <song@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20221025134148.3300700-9-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jiri Olsa 2022-10-25 15:41:48 +02:00 committed by Alexei Starovoitov
parent e697d8dceb
commit b2440443a6
2 changed files with 139 additions and 0 deletions
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89
tools/testing/selftests/bpf/prog_tests/kprobe_multi_testmod_test.c Normal file
View file

@ -0,0 +1,89 @@
// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include "kprobe_multi.skel.h"
#include "trace_helpers.h"
#include "bpf/libbpf_internal.h"
static void kprobe_multi_testmod_check(struct kprobe_multi *skel)
{
ASSERT_EQ(skel->bss->kprobe_testmod_test1_result, 1, "kprobe_test1_result");
ASSERT_EQ(skel->bss->kprobe_testmod_test2_result, 1, "kprobe_test2_result");
ASSERT_EQ(skel->bss->kprobe_testmod_test3_result, 1, "kprobe_test3_result");
ASSERT_EQ(skel->bss->kretprobe_testmod_test1_result, 1, "kretprobe_test1_result");
ASSERT_EQ(skel->bss->kretprobe_testmod_test2_result, 1, "kretprobe_test2_result");
ASSERT_EQ(skel->bss->kretprobe_testmod_test3_result, 1, "kretprobe_test3_result");
}
static void test_testmod_attach_api(struct bpf_kprobe_multi_opts *opts)
{
struct kprobe_multi *skel = NULL;
skel = kprobe_multi__open_and_load();
if (!ASSERT_OK_PTR(skel, "fentry_raw_skel_load"))
return;
skel->bss->pid = getpid();
skel->links.test_kprobe_testmod = bpf_program__attach_kprobe_multi_opts(
skel->progs.test_kprobe_testmod,
NULL, opts);
if (!skel->links.test_kprobe_testmod)
goto cleanup;
opts->retprobe = true;
skel->links.test_kretprobe_testmod = bpf_program__attach_kprobe_multi_opts(
skel->progs.test_kretprobe_testmod,
NULL, opts);
if (!skel->links.test_kretprobe_testmod)
goto cleanup;
ASSERT_OK(trigger_module_test_read(1), "trigger_read");
kprobe_multi_testmod_check(skel);
cleanup:
kprobe_multi__destroy(skel);
}
static void test_testmod_attach_api_addrs(void)
{
LIBBPF_OPTS(bpf_kprobe_multi_opts, opts);
unsigned long long addrs[3];
addrs[0] = ksym_get_addr("bpf_testmod_fentry_test1");
ASSERT_NEQ(addrs[0], 0, "ksym_get_addr");
addrs[1] = ksym_get_addr("bpf_testmod_fentry_test2");
ASSERT_NEQ(addrs[1], 0, "ksym_get_addr");
addrs[2] = ksym_get_addr("bpf_testmod_fentry_test3");
ASSERT_NEQ(addrs[2], 0, "ksym_get_addr");
opts.addrs = (const unsigned long *) addrs;
opts.cnt = ARRAY_SIZE(addrs);
test_testmod_attach_api(&opts);
}
static void test_testmod_attach_api_syms(void)
{
LIBBPF_OPTS(bpf_kprobe_multi_opts, opts);
const char *syms[3] = {
"bpf_testmod_fentry_test1",
"bpf_testmod_fentry_test2",
"bpf_testmod_fentry_test3",
};
opts.syms = syms;
opts.cnt = ARRAY_SIZE(syms);
test_testmod_attach_api(&opts);
}
void serial_test_kprobe_multi_testmod_test(void)
{
if (!ASSERT_OK(load_kallsyms_refresh(), "load_kallsyms_refresh"))
return;
if (test__start_subtest("testmod_attach_api_syms"))
test_testmod_attach_api_syms();
if (test__start_subtest("testmod_attach_api_addrs"))
test_testmod_attach_api_addrs();
}

50
tools/testing/selftests/bpf/progs/kprobe_multi.c
View file

@ -110,3 +110,53 @@ int test_kretprobe_manual(struct pt_regs *ctx)
kprobe_multi_check(ctx, true);
return 0;
}
extern const void bpf_testmod_fentry_test1 __ksym;
extern const void bpf_testmod_fentry_test2 __ksym;
extern const void bpf_testmod_fentry_test3 __ksym;
__u64 kprobe_testmod_test1_result = 0;
__u64 kprobe_testmod_test2_result = 0;
__u64 kprobe_testmod_test3_result = 0;
__u64 kretprobe_testmod_test1_result = 0;
__u64 kretprobe_testmod_test2_result = 0;
__u64 kretprobe_testmod_test3_result = 0;
static void kprobe_multi_testmod_check(void *ctx, bool is_return)
{
if (bpf_get_current_pid_tgid() >> 32 != pid)
return;
__u64 addr = bpf_get_func_ip(ctx);
if (is_return) {
if ((const void *) addr == &bpf_testmod_fentry_test1)
kretprobe_testmod_test1_result = 1;
if ((const void *) addr == &bpf_testmod_fentry_test2)
kretprobe_testmod_test2_result = 1;
if ((const void *) addr == &bpf_testmod_fentry_test3)
kretprobe_testmod_test3_result = 1;
} else {
if ((const void *) addr == &bpf_testmod_fentry_test1)
kprobe_testmod_test1_result = 1;
if ((const void *) addr == &bpf_testmod_fentry_test2)
kprobe_testmod_test2_result = 1;
if ((const void *) addr == &bpf_testmod_fentry_test3)
kprobe_testmod_test3_result = 1;
}
}
SEC("kprobe.multi")
int test_kprobe_testmod(struct pt_regs *ctx)
{
kprobe_multi_testmod_check(ctx, false);
return 0;
}
SEC("kretprobe.multi")
int test_kretprobe_testmod(struct pt_regs *ctx)
{
kprobe_multi_testmod_check(ctx, true);
return 0;
}