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selftests/bpf: Test that module can't be unloaded with attached trampoline

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Adding test to verify that once we attach module's trampoline,
the module can't be unloaded.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210414195147.1624932-7-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2021-04-14 21:51:46 +02:00 committed by Alexei Starovoitov
parent cede72ad36
commit a1c05c3b09
1 changed files with 23 additions and 0 deletions
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23
tools/testing/selftests/bpf/prog_tests/module_attach.c
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@ -45,12 +45,18 @@ static int trigger_module_test_write(int write_sz)
return 0;
}
static int delete_module(const char *name, int flags)
{
return syscall(__NR_delete_module, name, flags);
}
void test_module_attach(void)
{
const int READ_SZ = 456;
const int WRITE_SZ = 457;
struct test_module_attach* skel;
struct test_module_attach__bss *bss;
struct bpf_link *link;
int err;
skel = test_module_attach__open();
@ -84,6 +90,23 @@ void test_module_attach(void)
ASSERT_EQ(bss->fexit_ret, -EIO, "fexit_tet");
ASSERT_EQ(bss->fmod_ret_read_sz, READ_SZ, "fmod_ret");
test_module_attach__detach(skel);
/* attach fentry/fexit and make sure it get's module reference */
link = bpf_program__attach(skel->progs.handle_fentry);
if (!ASSERT_OK_PTR(link, "attach_fentry"))
goto cleanup;
ASSERT_ERR(delete_module("bpf_testmod", 0), "delete_module");
bpf_link__destroy(link);
link = bpf_program__attach(skel->progs.handle_fexit);
if (!ASSERT_OK_PTR(link, "attach_fexit"))
goto cleanup;
ASSERT_ERR(delete_module("bpf_testmod", 0), "delete_module");
bpf_link__destroy(link);
cleanup:
test_module_attach__destroy(skel);
}