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selftests/bpf: Use target-less SEC() definitions in various tests

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Add new or modify existing SEC() definitions to be target-less and
validate that libbpf handles such program definitions correctly.

For kprobe/kretprobe we also add explicit test that generic
bpf_program__attach() works in cases when kprobe definition contains
proper target. It wasn't previously tested as selftests code always
explicitly specified the target regardless.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20220428185349.3799599-4-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko 2022-04-28 11:53:49 -07:00 committed by Daniel Borkmann
parent cc7d8f2c8e
commit 32c03c4954
5 changed files with 52 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
tools/testing/selftests/bpf/prog_tests/attach_probe.c
View File

@ -55,6 +55,7 @@ void test_attach_probe(void)
if (!ASSERT_OK_PTR(skel->bss, "check_bss"))
goto cleanup;
/* manual-attach kprobe/kretprobe */
kprobe_link = bpf_program__attach_kprobe(skel->progs.handle_kprobe,
false /* retprobe */,
SYS_NANOSLEEP_KPROBE_NAME);
@ -69,6 +70,13 @@ void test_attach_probe(void)
goto cleanup;
skel->links.handle_kretprobe = kretprobe_link;
/* auto-attachable kprobe and kretprobe */
skel->links.handle_kprobe_auto = bpf_program__attach(skel->progs.handle_kprobe_auto);
ASSERT_OK_PTR(skel->links.handle_kprobe_auto, "attach_kprobe_auto");
skel->links.handle_kretprobe_auto = bpf_program__attach(skel->progs.handle_kretprobe_auto);
ASSERT_OK_PTR(skel->links.handle_kretprobe_auto, "attach_kretprobe_auto");
if (!legacy)
ASSERT_EQ(uprobe_ref_ctr, 0, "uprobe_ref_ctr_before");
@ -157,7 +165,9 @@ void test_attach_probe(void)
trigger_func2();
ASSERT_EQ(skel->bss->kprobe_res, 1, "check_kprobe_res");
ASSERT_EQ(skel->bss->kprobe2_res, 11, "check_kprobe_auto_res");
ASSERT_EQ(skel->bss->kretprobe_res, 2, "check_kretprobe_res");
ASSERT_EQ(skel->bss->kretprobe2_res, 22, "check_kretprobe_auto_res");
ASSERT_EQ(skel->bss->uprobe_res, 3, "check_uprobe_res");
ASSERT_EQ(skel->bss->uretprobe_res, 4, "check_uretprobe_res");
ASSERT_EQ(skel->bss->uprobe_byname_res, 5, "check_uprobe_byname_res");

14
tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c
View File

@ -140,14 +140,14 @@ test_attach_api(const char *pattern, struct bpf_kprobe_multi_opts *opts)
goto cleanup;
skel->bss->pid = getpid();
link1 = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kprobe,
link1 = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kprobe_manual,
pattern, opts);
if (!ASSERT_OK_PTR(link1, "bpf_program__attach_kprobe_multi_opts"))
goto cleanup;
if (opts) {
opts->retprobe = true;
link2 = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kretprobe,
link2 = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kretprobe_manual,
pattern, opts);
if (!ASSERT_OK_PTR(link2, "bpf_program__attach_kprobe_multi_opts"))
goto cleanup;
@ -232,7 +232,7 @@ static void test_attach_api_fails(void)
skel->bss->pid = getpid();
/* fail_1 - pattern and opts NULL */
link = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kprobe,
link = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kprobe_manual,
NULL, NULL);
if (!ASSERT_ERR_PTR(link, "fail_1"))
goto cleanup;
@ -246,7 +246,7 @@ static void test_attach_api_fails(void)
opts.cnt = ARRAY_SIZE(syms);
opts.cookies = NULL;
link = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kprobe,
link = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kprobe_manual,
NULL, &opts);
if (!ASSERT_ERR_PTR(link, "fail_2"))
goto cleanup;
@ -260,7 +260,7 @@ static void test_attach_api_fails(void)
opts.cnt = ARRAY_SIZE(syms);
opts.cookies = NULL;
link = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kprobe,
link = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kprobe_manual,
"ksys_*", &opts);
if (!ASSERT_ERR_PTR(link, "fail_3"))
goto cleanup;
@ -274,7 +274,7 @@ static void test_attach_api_fails(void)
opts.cnt = ARRAY_SIZE(syms);
opts.cookies = NULL;
link = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kprobe,
link = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kprobe_manual,
"ksys_*", &opts);
if (!ASSERT_ERR_PTR(link, "fail_4"))
goto cleanup;
@ -288,7 +288,7 @@ static void test_attach_api_fails(void)
opts.cnt = 0;
opts.cookies = cookies;
link = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kprobe,
link = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kprobe_manual,
"ksys_*", &opts);
if (!ASSERT_ERR_PTR(link, "fail_5"))
goto cleanup;

14
tools/testing/selftests/bpf/progs/kprobe_multi.c
View File

@ -98,3 +98,17 @@ int test_kretprobe(struct pt_regs *ctx)
kprobe_multi_check(ctx, true);
return 0;
}
SEC("kprobe.multi")
int test_kprobe_manual(struct pt_regs *ctx)
{
kprobe_multi_check(ctx, false);
return 0;
}
SEC("kretprobe.multi")
int test_kretprobe_manual(struct pt_regs *ctx)
{
kprobe_multi_check(ctx, true);
return 0;
}

23
tools/testing/selftests/bpf/progs/test_attach_probe.c
View File

@ -5,9 +5,12 @@
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include "bpf_misc.h"
int kprobe_res = 0;
int kprobe2_res = 0;
int kretprobe_res = 0;
int kretprobe2_res = 0;
int uprobe_res = 0;
int uretprobe_res = 0;
int uprobe_byname_res = 0;
@ -15,20 +18,34 @@ int uretprobe_byname_res = 0;
int uprobe_byname2_res = 0;
int uretprobe_byname2_res = 0;
SEC("kprobe/sys_nanosleep")
SEC("kprobe")
int handle_kprobe(struct pt_regs *ctx)
{
kprobe_res = 1;
return 0;
}
SEC("kretprobe/sys_nanosleep")
int BPF_KRETPROBE(handle_kretprobe)
SEC("kprobe/" SYS_PREFIX "sys_nanosleep")
int BPF_KPROBE(handle_kprobe_auto)
{
kprobe2_res = 11;
return 0;
}
SEC("kretprobe")
int handle_kretprobe(struct pt_regs *ctx)
{
kretprobe_res = 2;
return 0;
}
SEC("kretprobe/" SYS_PREFIX "sys_nanosleep")
int BPF_KRETPROBE(handle_kretprobe_auto)
{
kretprobe2_res = 22;
return 0;
}
SEC("uprobe")
int handle_uprobe(struct pt_regs *ctx)
{

2
tools/testing/selftests/bpf/progs/test_module_attach.c
View File

@ -64,7 +64,7 @@ int BPF_PROG(handle_fentry,
__u32 fentry_manual_read_sz = 0;
SEC("fentry/placeholder")
SEC("fentry")
int BPF_PROG(handle_fentry_manual,
struct file *file, struct kobject *kobj,
struct bin_attribute *bin_attr, char *buf, loff_t off, size_t len)