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selftests/bpf: Add set_attach_target() API selftest for module target

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Add test for bpf_program__set_attach_target() API, validating it can find
kernel module fentry target.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20201211215825.3646154-3-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko 2020-12-11 13:58:25 -08:00 committed by Daniel Borkmann
parent fe62de310e
commit 2e33f831fc
2 changed files with 21 additions and 1 deletions
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11
tools/testing/selftests/bpf/prog_tests/module_attach.c
View file

@ -28,10 +28,18 @@ void test_module_attach(void)
struct test_module_attach__bss *bss;
int err;
skel = test_module_attach__open_and_load();
skel = test_module_attach__open();
if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
return;
err = bpf_program__set_attach_target(skel->progs.handle_fentry_manual,
0, "bpf_testmod_test_read");
ASSERT_OK(err, "set_attach_target");
err = test_module_attach__load(skel);
if (CHECK(err, "skel_load", "failed to load skeleton\n"))
return;
bss = skel->bss;
err = test_module_attach__attach(skel);
@ -44,6 +52,7 @@ void test_module_attach(void)
ASSERT_EQ(bss->raw_tp_read_sz, READ_SZ, "raw_tp");
ASSERT_EQ(bss->tp_btf_read_sz, READ_SZ, "tp_btf");
ASSERT_EQ(bss->fentry_read_sz, READ_SZ, "fentry");
ASSERT_EQ(bss->fentry_manual_read_sz, READ_SZ, "fentry_manual");
ASSERT_EQ(bss->fexit_read_sz, READ_SZ, "fexit");
ASSERT_EQ(bss->fexit_ret, -EIO, "fexit_tet");
ASSERT_EQ(bss->fmod_ret_read_sz, READ_SZ, "fmod_ret");

11
tools/testing/selftests/bpf/progs/test_module_attach.c
View file

@ -38,6 +38,17 @@ int BPF_PROG(handle_fentry,
return 0;
}
__u32 fentry_manual_read_sz = 0;
SEC("fentry/placeholder")
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)
{
fentry_manual_read_sz = len;
return 0;
}
__u32 fexit_read_sz = 0;
int fexit_ret = 0;