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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2021. Huawei Technologies Co., Ltd */
#include <test_progs.h>
#include "strncmp_test.skel.h"
static int trigger_strncmp(const struct strncmp_test *skel)
{
int cmp;
usleep(1);
cmp = skel->bss->cmp_ret;
if (cmp > 0)
return 1;
if (cmp < 0)
return -1;
return 0;
}
/*
* Compare str and target after making str[i] != target[i].
* When exp is -1, make str[i] < target[i] and delta = -1.
*/
static void strncmp_full_str_cmp(struct strncmp_test *skel, const char *name,
int exp)
{
size_t nr = sizeof(skel->bss->str);
char *str = skel->bss->str;
int delta = exp;
int got;
size_t i;
memcpy(str, skel->rodata->target, nr);
for (i = 0; i < nr - 1; i++) {
str[i] += delta;
got = trigger_strncmp(skel);
ASSERT_EQ(got, exp, name);
str[i] -= delta;
}
}
static void test_strncmp_ret(void)
{
struct strncmp_test *skel;
int err, got;
skel = strncmp_test__open();
if (!ASSERT_OK_PTR(skel, "strncmp_test open"))
return;
bpf_program__set_autoload(skel->progs.do_strncmp, true);
err = strncmp_test__load(skel);
if (!ASSERT_EQ(err, 0, "strncmp_test load"))
goto out;
err = strncmp_test__attach(skel);
if (!ASSERT_EQ(err, 0, "strncmp_test attach"))
goto out;
skel->bss->target_pid = getpid();
/* Empty str */
skel->bss->str[0] = '\0';
got = trigger_strncmp(skel);
ASSERT_EQ(got, -1, "strncmp: empty str");
/* Same string */
memcpy(skel->bss->str, skel->rodata->target, sizeof(skel->bss->str));
got = trigger_strncmp(skel);
ASSERT_EQ(got, 0, "strncmp: same str");
/* Not-null-terminated string */
memcpy(skel->bss->str, skel->rodata->target, sizeof(skel->bss->str));
skel->bss->str[sizeof(skel->bss->str) - 1] = 'A';
got = trigger_strncmp(skel);
ASSERT_EQ(got, 1, "strncmp: not-null-term str");
strncmp_full_str_cmp(skel, "strncmp: less than", -1);
strncmp_full_str_cmp(skel, "strncmp: greater than", 1);
out:
strncmp_test__destroy(skel);
}
static void test_strncmp_bad_not_const_str_size(void)
{
struct strncmp_test *skel;
int err;
skel = strncmp_test__open();
if (!ASSERT_OK_PTR(skel, "strncmp_test open"))
return;
bpf_program__set_autoload(skel->progs.strncmp_bad_not_const_str_size, true);
err = strncmp_test__load(skel);
ASSERT_ERR(err, "strncmp_test load bad_not_const_str_size");
strncmp_test__destroy(skel);
}
static void test_strncmp_bad_writable_target(void)
{
struct strncmp_test *skel;
int err;
skel = strncmp_test__open();
if (!ASSERT_OK_PTR(skel, "strncmp_test open"))
return;
bpf_program__set_autoload(skel->progs.strncmp_bad_writable_target, true);
err = strncmp_test__load(skel);
ASSERT_ERR(err, "strncmp_test load bad_writable_target");
strncmp_test__destroy(skel);
}
static void test_strncmp_bad_not_null_term_target(void)
{
struct strncmp_test *skel;
int err;
skel = strncmp_test__open();
if (!ASSERT_OK_PTR(skel, "strncmp_test open"))
return;
bpf_program__set_autoload(skel->progs.strncmp_bad_not_null_term_target, true);
err = strncmp_test__load(skel);
ASSERT_ERR(err, "strncmp_test load bad_not_null_term_target");
strncmp_test__destroy(skel);
}
void test_test_strncmp(void)
{
if (test__start_subtest("strncmp_ret"))
test_strncmp_ret();
if (test__start_subtest("strncmp_bad_not_const_str_size"))
test_strncmp_bad_not_const_str_size();
if (test__start_subtest("strncmp_bad_writable_target"))
test_strncmp_bad_writable_target();
if (test__start_subtest("strncmp_bad_not_null_term_target"))
test_strncmp_bad_not_null_term_target();
}
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