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selftests/bpf: add missing __weak kfunc log fixup test

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Add test validating that libbpf correctly poisons and reports __weak
unresolved kfuncs in post-processed verifier log.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20230418002148.3255690-5-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko 2023-04-17 17:21:46 -07:00 committed by Alexei Starovoitov
parent 05b6f766b2
commit 30bbfe3236
2 changed files with 41 additions and 0 deletions
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31
tools/testing/selftests/bpf/prog_tests/log_fixup.c
View File

@ -135,6 +135,35 @@ cleanup:
test_log_fixup__destroy(skel);
}
static void missing_kfunc(void)
{
char log_buf[8 * 1024];
struct test_log_fixup* skel;
int err;
skel = test_log_fixup__open();
if (!ASSERT_OK_PTR(skel, "skel_open"))
return;
bpf_program__set_autoload(skel->progs.use_missing_kfunc, true);
bpf_program__set_log_buf(skel->progs.use_missing_kfunc, log_buf, sizeof(log_buf));
err = test_log_fixup__load(skel);
if (!ASSERT_ERR(err, "load_fail"))
goto cleanup;
ASSERT_HAS_SUBSTR(log_buf,
"0: <invalid kfunc call>\n"
"kfunc 'bpf_nonexistent_kfunc' is referenced but wasn't resolved\n",
"log_buf");
if (env.verbosity > VERBOSE_NONE)
printf("LOG: \n=================\n%s=================\n", log_buf);
cleanup:
test_log_fixup__destroy(skel);
}
void test_log_fixup(void)
{
if (test__start_subtest("bad_core_relo_trunc_none"))
@ -147,4 +176,6 @@ void test_log_fixup(void)
bad_core_relo_subprog();
if (test__start_subtest("missing_map"))
missing_map();
if (test__start_subtest("missing_kfunc"))
missing_kfunc();
}

10
tools/testing/selftests/bpf/progs/test_log_fixup.c
View File

@ -61,4 +61,14 @@ int use_missing_map(const void *ctx)
return value != NULL;
}
extern int bpf_nonexistent_kfunc(void) __ksym __weak;
SEC("?raw_tp/sys_enter")
int use_missing_kfunc(const void *ctx)
{
bpf_nonexistent_kfunc();
return 0;
}
char _license[] SEC("license") = "GPL";