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selftests/bpf: Add kprobe_multi attach test 

Adding kprobe_multi attach test that uses new fprobe interface to
attach kprobe program to multiple functions.

The test is attaching programs to bpf_fentry_test* functions and
uses single trampoline program bpf_prog_test_run to trigger
bpf_fentry_test* functions.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220316122419.933957-11-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2022-03-16 13:24:16 +01:00 committed by Alexei Starovoitov
parent ddc6b04989
commit f7a11eeccb
3 changed files with 243 additions and 0 deletions
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141
tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c Normal file
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@ -0,0 +1,141 @@
// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include "kprobe_multi.skel.h"
#include "trace_helpers.h"
static void kprobe_multi_test_run(struct kprobe_multi *skel)
{
LIBBPF_OPTS(bpf_test_run_opts, topts);
int err, prog_fd;
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->kprobe_test1_result, 1, "kprobe_test1_result");
ASSERT_EQ(skel->bss->kprobe_test2_result, 1, "kprobe_test2_result");
ASSERT_EQ(skel->bss->kprobe_test3_result, 1, "kprobe_test3_result");
ASSERT_EQ(skel->bss->kprobe_test4_result, 1, "kprobe_test4_result");
ASSERT_EQ(skel->bss->kprobe_test5_result, 1, "kprobe_test5_result");
ASSERT_EQ(skel->bss->kprobe_test6_result, 1, "kprobe_test6_result");
ASSERT_EQ(skel->bss->kprobe_test7_result, 1, "kprobe_test7_result");
ASSERT_EQ(skel->bss->kprobe_test8_result, 1, "kprobe_test8_result");
ASSERT_EQ(skel->bss->kretprobe_test1_result, 1, "kretprobe_test1_result");
ASSERT_EQ(skel->bss->kretprobe_test2_result, 1, "kretprobe_test2_result");
ASSERT_EQ(skel->bss->kretprobe_test3_result, 1, "kretprobe_test3_result");
ASSERT_EQ(skel->bss->kretprobe_test4_result, 1, "kretprobe_test4_result");
ASSERT_EQ(skel->bss->kretprobe_test5_result, 1, "kretprobe_test5_result");
ASSERT_EQ(skel->bss->kretprobe_test6_result, 1, "kretprobe_test6_result");
ASSERT_EQ(skel->bss->kretprobe_test7_result, 1, "kretprobe_test7_result");
ASSERT_EQ(skel->bss->kretprobe_test8_result, 1, "kretprobe_test8_result");
}
static void test_skel_api(void)
{
struct kprobe_multi *skel = NULL;
int err;
skel = kprobe_multi__open_and_load();
if (!ASSERT_OK_PTR(skel, "kprobe_multi__open_and_load"))
goto cleanup;
skel->bss->pid = getpid();
err = kprobe_multi__attach(skel);
if (!ASSERT_OK(err, "kprobe_multi__attach"))
goto cleanup;
kprobe_multi_test_run(skel);
cleanup:
kprobe_multi__destroy(skel);
}
static void test_link_api(struct bpf_link_create_opts *opts)
{
int prog_fd, link1_fd = -1, link2_fd = -1;
struct kprobe_multi *skel = NULL;
skel = kprobe_multi__open_and_load();
if (!ASSERT_OK_PTR(skel, "fentry_raw_skel_load"))
goto cleanup;
skel->bss->pid = getpid();
prog_fd = bpf_program__fd(skel->progs.test_kprobe);
link1_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_KPROBE_MULTI, opts);
if (!ASSERT_GE(link1_fd, 0, "link_fd"))
goto cleanup;
opts->kprobe_multi.flags = BPF_F_KPROBE_MULTI_RETURN;
prog_fd = bpf_program__fd(skel->progs.test_kretprobe);
link2_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_KPROBE_MULTI, opts);
if (!ASSERT_GE(link2_fd, 0, "link_fd"))
goto cleanup;
kprobe_multi_test_run(skel);
cleanup:
if (link1_fd != -1)
close(link1_fd);
if (link2_fd != -1)
close(link2_fd);
kprobe_multi__destroy(skel);
}
#define GET_ADDR(__sym, __addr) ({ \
__addr = ksym_get_addr(__sym); \
if (!ASSERT_NEQ(__addr, 0, "kallsyms load failed for " #__sym)) \
return; \
})
static void test_link_api_addrs(void)
{
LIBBPF_OPTS(bpf_link_create_opts, opts);
unsigned long long addrs[8];
GET_ADDR("bpf_fentry_test1", addrs[0]);
GET_ADDR("bpf_fentry_test2", addrs[1]);
GET_ADDR("bpf_fentry_test3", addrs[2]);
GET_ADDR("bpf_fentry_test4", addrs[3]);
GET_ADDR("bpf_fentry_test5", addrs[4]);
GET_ADDR("bpf_fentry_test6", addrs[5]);
GET_ADDR("bpf_fentry_test7", addrs[6]);
GET_ADDR("bpf_fentry_test8", addrs[7]);
opts.kprobe_multi.addrs = (const unsigned long*) addrs;
opts.kprobe_multi.cnt = ARRAY_SIZE(addrs);
test_link_api(&opts);
}
static void test_link_api_syms(void)
{
LIBBPF_OPTS(bpf_link_create_opts, opts);
const char *syms[8] = {
"bpf_fentry_test1",
"bpf_fentry_test2",
"bpf_fentry_test3",
"bpf_fentry_test4",
"bpf_fentry_test5",
"bpf_fentry_test6",
"bpf_fentry_test7",
"bpf_fentry_test8",
};
opts.kprobe_multi.syms = syms;
opts.kprobe_multi.cnt = ARRAY_SIZE(syms);
test_link_api(&opts);
}
void test_kprobe_multi_test(void)
{
if (!ASSERT_OK(load_kallsyms(), "load_kallsyms"))
return;
if (test__start_subtest("skel_api"))
test_skel_api();
if (test__start_subtest("link_api_addrs"))
test_link_api_syms();
if (test__start_subtest("link_api_syms"))
test_link_api_addrs();
}

95
tools/testing/selftests/bpf/progs/kprobe_multi.c Normal file
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@ -0,0 +1,95 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <stdbool.h>
char _license[] SEC("license") = "GPL";
extern const void bpf_fentry_test1 __ksym;
extern const void bpf_fentry_test2 __ksym;
extern const void bpf_fentry_test3 __ksym;
extern const void bpf_fentry_test4 __ksym;
extern const void bpf_fentry_test5 __ksym;
extern const void bpf_fentry_test6 __ksym;
extern const void bpf_fentry_test7 __ksym;
extern const void bpf_fentry_test8 __ksym;
int pid = 0;
__u64 kprobe_test1_result = 0;
__u64 kprobe_test2_result = 0;
__u64 kprobe_test3_result = 0;
__u64 kprobe_test4_result = 0;
__u64 kprobe_test5_result = 0;
__u64 kprobe_test6_result = 0;
__u64 kprobe_test7_result = 0;
__u64 kprobe_test8_result = 0;
__u64 kretprobe_test1_result = 0;
__u64 kretprobe_test2_result = 0;
__u64 kretprobe_test3_result = 0;
__u64 kretprobe_test4_result = 0;
__u64 kretprobe_test5_result = 0;
__u64 kretprobe_test6_result = 0;
__u64 kretprobe_test7_result = 0;
__u64 kretprobe_test8_result = 0;
static void kprobe_multi_check(void *ctx, bool is_return)
{
if (bpf_get_current_pid_tgid() >> 32 != pid)
return;
__u64 addr = bpf_get_func_ip(ctx);
#define SET(__var, __addr) ({ \
if ((const void *) addr == __addr) \
__var = 1; \
})
if (is_return) {
SET(kretprobe_test1_result, &bpf_fentry_test1);
SET(kretprobe_test2_result, &bpf_fentry_test2);
SET(kretprobe_test3_result, &bpf_fentry_test3);
SET(kretprobe_test4_result, &bpf_fentry_test4);
SET(kretprobe_test5_result, &bpf_fentry_test5);
SET(kretprobe_test6_result, &bpf_fentry_test6);
SET(kretprobe_test7_result, &bpf_fentry_test7);
SET(kretprobe_test8_result, &bpf_fentry_test8);
} else {
SET(kprobe_test1_result, &bpf_fentry_test1);
SET(kprobe_test2_result, &bpf_fentry_test2);
SET(kprobe_test3_result, &bpf_fentry_test3);
SET(kprobe_test4_result, &bpf_fentry_test4);
SET(kprobe_test5_result, &bpf_fentry_test5);
SET(kprobe_test6_result, &bpf_fentry_test6);
SET(kprobe_test7_result, &bpf_fentry_test7);
SET(kprobe_test8_result, &bpf_fentry_test8);
}
#undef SET
}
/*
* 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;
}
SEC("kprobe.multi/bpf_fentry_tes??")
int test_kprobe(struct pt_regs *ctx)
{
kprobe_multi_check(ctx, false);
return 0;
}
SEC("kretprobe.multi/bpf_fentry_test*")
int test_kretprobe(struct pt_regs *ctx)
{
kprobe_multi_check(ctx, true);
return 0;
}

7
tools/testing/selftests/bpf/trace_helpers.c
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@ -34,6 +34,13 @@ int load_kallsyms(void)
if (!f)
return -ENOENT;
/*
* This is called/used from multiplace places,
* load symbols just once.
*/
if (sym_cnt)
return 0;
while (fgets(buf, sizeof(buf), f)) {
if (sscanf(buf, "%p %c %s", &addr, &symbol, func) != 3)
break;