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selftests/bpf: Add kprobe_multi bpf_cookie test 

Adding bpf_cookie test for programs attached by kprobe_multi links.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220316122419.933957-12-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2022-03-16 13:24:17 +01:00 committed by Alexei Starovoitov
parent f7a11eeccb
commit 2c6401c966
2 changed files with 131 additions and 19 deletions
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109
tools/testing/selftests/bpf/prog_tests/bpf_cookie.c
View File

@ -7,6 +7,7 @@
#include <unistd.h>
#include <test_progs.h>
#include "test_bpf_cookie.skel.h"
#include "kprobe_multi.skel.h"
/* uprobe attach point */
static void trigger_func(void)
@ -63,6 +64,112 @@ cleanup:
bpf_link__destroy(retlink2);
}
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 kprobe_multi_link_api_subtest(void)
{
int prog_fd, link1_fd = -1, link2_fd = -1;
struct kprobe_multi *skel = NULL;
LIBBPF_OPTS(bpf_link_create_opts, opts);
unsigned long long addrs[8];
__u64 cookies[8];
if (!ASSERT_OK(load_kallsyms(), "load_kallsyms"))
goto cleanup;
skel = kprobe_multi__open_and_load();
if (!ASSERT_OK_PTR(skel, "fentry_raw_skel_load"))
goto cleanup;
skel->bss->pid = getpid();
skel->bss->test_cookie = true;
#define GET_ADDR(__sym, __addr) ({ \
__addr = ksym_get_addr(__sym); \
if (!ASSERT_NEQ(__addr, 0, "ksym_get_addr " #__sym)) \
goto cleanup; \
})
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]);
#undef GET_ADDR
cookies[0] = 1;
cookies[1] = 2;
cookies[2] = 3;
cookies[3] = 4;
cookies[4] = 5;
cookies[5] = 6;
cookies[6] = 7;
cookies[7] = 8;
opts.kprobe_multi.addrs = (const unsigned long *) &addrs;
opts.kprobe_multi.cnt = ARRAY_SIZE(addrs);
opts.kprobe_multi.cookies = (const __u64 *) &cookies;
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, "link1_fd"))
goto cleanup;
cookies[0] = 8;
cookies[1] = 7;
cookies[2] = 6;
cookies[3] = 5;
cookies[4] = 4;
cookies[5] = 3;
cookies[6] = 2;
cookies[7] = 1;
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, "link2_fd"))
goto cleanup;
kprobe_multi_test_run(skel);
cleanup:
close(link1_fd);
close(link2_fd);
kprobe_multi__destroy(skel);
}
static void uprobe_subtest(struct test_bpf_cookie *skel)
{
DECLARE_LIBBPF_OPTS(bpf_uprobe_opts, opts);
@ -249,6 +356,8 @@ void test_bpf_cookie(void)
if (test__start_subtest("kprobe"))
kprobe_subtest(skel);
if (test__start_subtest("multi_kprobe_link_api"))
kprobe_multi_link_api_subtest();
if (test__start_subtest("uprobe"))
uprobe_subtest(skel);
if (test__start_subtest("tracepoint"))

41
tools/testing/selftests/bpf/progs/kprobe_multi.c
View File

@ -16,6 +16,7 @@ extern const void bpf_fentry_test7 __ksym;
extern const void bpf_fentry_test8 __ksym;
int pid = 0;
bool test_cookie = false;
__u64 kprobe_test1_result = 0;
__u64 kprobe_test2_result = 0;
@ -40,31 +41,33 @@ static void kprobe_multi_check(void *ctx, bool is_return)
if (bpf_get_current_pid_tgid() >> 32 != pid)
return;
__u64 cookie = test_cookie ? bpf_get_attach_cookie(ctx) : 0;
__u64 addr = bpf_get_func_ip(ctx);
#define SET(__var, __addr) ({ \
if ((const void *) addr == __addr) \
__var = 1; \
#define SET(__var, __addr, __cookie) ({ \
if (((const void *) addr == __addr) && \
(!test_cookie || (cookie == __cookie))) \
__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);
SET(kretprobe_test1_result, &bpf_fentry_test1, 8);
SET(kretprobe_test2_result, &bpf_fentry_test2, 7);
SET(kretprobe_test3_result, &bpf_fentry_test3, 6);
SET(kretprobe_test4_result, &bpf_fentry_test4, 5);
SET(kretprobe_test5_result, &bpf_fentry_test5, 4);
SET(kretprobe_test6_result, &bpf_fentry_test6, 3);
SET(kretprobe_test7_result, &bpf_fentry_test7, 2);
SET(kretprobe_test8_result, &bpf_fentry_test8, 1);
} 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);
SET(kprobe_test1_result, &bpf_fentry_test1, 1);
SET(kprobe_test2_result, &bpf_fentry_test2, 2);
SET(kprobe_test3_result, &bpf_fentry_test3, 3);
SET(kprobe_test4_result, &bpf_fentry_test4, 4);
SET(kprobe_test5_result, &bpf_fentry_test5, 5);
SET(kprobe_test6_result, &bpf_fentry_test6, 6);
SET(kprobe_test7_result, &bpf_fentry_test7, 7);
SET(kprobe_test8_result, &bpf_fentry_test8, 8);
}
#undef SET