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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2022 Facebook
* Copyright (C) 2022 Huawei Technologies Duesseldorf GmbH
*
* Author: Roberto Sassu <roberto.sassu@huawei.com>
*/
#include <test_progs.h>
#include "test_kfunc_dynptr_param.skel.h"
static size_t log_buf_sz = 1048576; /* 1 MB */
static char obj_log_buf[1048576];
static struct {
const char *prog_name;
const char *expected_verifier_err_msg;
int expected_runtime_err;
} kfunc_dynptr_tests[] = {
{"not_valid_dynptr", "Expected an initialized dynptr as arg #1", 0},
{"not_ptr_to_stack", "arg#0 expected pointer to stack or dynptr_ptr", 0},
{"dynptr_data_null", NULL, -EBADMSG},
};
static bool kfunc_not_supported;
static int libbpf_print_cb(enum libbpf_print_level level, const char *fmt,
va_list args)
{
if (strcmp(fmt, "libbpf: extern (func ksym) '%s': not found in kernel or module BTFs\n"))
return 0;
if (strcmp(va_arg(args, char *), "bpf_verify_pkcs7_signature"))
return 0;
kfunc_not_supported = true;
return 0;
}
static void verify_fail(const char *prog_name, const char *expected_err_msg)
{
struct test_kfunc_dynptr_param *skel;
LIBBPF_OPTS(bpf_object_open_opts, opts);
libbpf_print_fn_t old_print_cb;
struct bpf_program *prog;
int err;
opts.kernel_log_buf = obj_log_buf;
opts.kernel_log_size = log_buf_sz;
opts.kernel_log_level = 1;
skel = test_kfunc_dynptr_param__open_opts(&opts);
if (!ASSERT_OK_PTR(skel, "test_kfunc_dynptr_param__open_opts"))
goto cleanup;
prog = bpf_object__find_program_by_name(skel->obj, prog_name);
if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
goto cleanup;
bpf_program__set_autoload(prog, true);
bpf_map__set_max_entries(skel->maps.ringbuf, getpagesize());
kfunc_not_supported = false;
old_print_cb = libbpf_set_print(libbpf_print_cb);
err = test_kfunc_dynptr_param__load(skel);
libbpf_set_print(old_print_cb);
if (err < 0 && kfunc_not_supported) {
fprintf(stderr,
"%s:SKIP:bpf_verify_pkcs7_signature() kfunc not supported\n",
__func__);
test__skip();
goto cleanup;
}
if (!ASSERT_ERR(err, "unexpected load success"))
goto cleanup;
if (!ASSERT_OK_PTR(strstr(obj_log_buf, expected_err_msg), "expected_err_msg")) {
fprintf(stderr, "Expected err_msg: %s\n", expected_err_msg);
fprintf(stderr, "Verifier output: %s\n", obj_log_buf);
}
cleanup:
test_kfunc_dynptr_param__destroy(skel);
}
static void verify_success(const char *prog_name, int expected_runtime_err)
{
struct test_kfunc_dynptr_param *skel;
libbpf_print_fn_t old_print_cb;
struct bpf_program *prog;
struct bpf_link *link;
__u32 next_id;
int err;
skel = test_kfunc_dynptr_param__open();
if (!ASSERT_OK_PTR(skel, "test_kfunc_dynptr_param__open"))
return;
skel->bss->pid = getpid();
bpf_map__set_max_entries(skel->maps.ringbuf, getpagesize());
kfunc_not_supported = false;
old_print_cb = libbpf_set_print(libbpf_print_cb);
err = test_kfunc_dynptr_param__load(skel);
libbpf_set_print(old_print_cb);
if (err < 0 && kfunc_not_supported) {
fprintf(stderr,
"%s:SKIP:bpf_verify_pkcs7_signature() kfunc not supported\n",
__func__);
test__skip();
goto cleanup;
}
if (!ASSERT_OK(err, "test_kfunc_dynptr_param__load"))
goto cleanup;
prog = bpf_object__find_program_by_name(skel->obj, prog_name);
if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
goto cleanup;
link = bpf_program__attach(prog);
if (!ASSERT_OK_PTR(link, "bpf_program__attach"))
goto cleanup;
err = bpf_prog_get_next_id(0, &next_id);
bpf_link__destroy(link);
if (!ASSERT_OK(err, "bpf_prog_get_next_id"))
goto cleanup;
ASSERT_EQ(skel->bss->err, expected_runtime_err, "err");
cleanup:
test_kfunc_dynptr_param__destroy(skel);
}
void test_kfunc_dynptr_param(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(kfunc_dynptr_tests); i++) {
if (!test__start_subtest(kfunc_dynptr_tests[i].prog_name))
continue;
if (kfunc_dynptr_tests[i].expected_verifier_err_msg)
verify_fail(kfunc_dynptr_tests[i].prog_name,
kfunc_dynptr_tests[i].expected_verifier_err_msg);
else
verify_success(kfunc_dynptr_tests[i].prog_name,
kfunc_dynptr_tests[i].expected_runtime_err);
}
}
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