#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <check.h>
#include "../../filter.h"
#include "../../disasm.h"
long nr = 42;
static bool filter_eq(struct sock_filter *f1, struct sock_filter *f2,
unsigned int n)
{
unsigned i;
for (i = 0; i < n; i++) {
if (memcmp((void *)(f1 + i), (void *)(f2 + i),
sizeof(struct sock_filter)) != 0) {
printf("expected:\n");
bpf_disasm(f1[i], i);
printf("got:\n");
bpf_disasm(f2[i], i);
return false;
}
}
return true;
}
START_TEST(test_single_instr)
{
unsigned int size;
struct bpf_call calls[] = {
{ .name = "test1" },
};
struct syscall_entry table[] = {
{ .count = 1, .nr = nr, .entry = &calls[0] },
};
struct sock_filter result[10];
struct sock_filter expected[] = {
/* l0 */ BPF_STMT(BPF_LD | BPF_W | BPF_ABS,
(offsetof(struct seccomp_data, arch))),
/* l1 */
BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, SEITAN_AUDIT_ARCH, 0, 3),
/* l2 */
BPF_STMT(BPF_LD | BPF_W | BPF_ABS,
(offsetof(struct seccomp_data, nr))),
/* l3 */ EQ(nr, 0, 1),
/* l4 */ JUMPA(0),
/* l5 */ BPF_STMT(BPF_RET | BPF_K, SECCOMP_RET_ALLOW),
/* l6 */ BPF_STMT(BPF_RET | BPF_K, SECCOMP_RET_USER_NOTIF),
};
size = create_bfp_program(table, result,
sizeof(table) / sizeof(table[0]));
ck_assert_uint_eq(size, sizeof(expected) / sizeof(expected[0]));
ck_assert(filter_eq(expected, result,
sizeof(expected) / sizeof(expected[0])));
}
END_TEST
START_TEST(test_single_instr_two_args)
{
unsigned int size;
long nr = 42;
struct bpf_call calls[] = {
{
.name = "test1",
.args = { 0, 123, 321, 0, 0, 0 },
.check_arg = { false, true, true, false, false, false },
},
};
struct syscall_entry table[] = {
{ .count = 1, .nr = nr, .entry = &calls[0] },
};
struct sock_filter result[10];
struct sock_filter expected[] = {
/* l0 */ BPF_STMT(BPF_LD | BPF_W | BPF_ABS,
(offsetof(struct seccomp_data, arch))),
/* l1 */
BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, SEITAN_AUDIT_ARCH, 0, 5),
/* l2 */
BPF_STMT(BPF_LD | BPF_W | BPF_ABS,
(offsetof(struct seccomp_data, nr))),
/* l3 */ EQ(nr, 0, 3),
/* l4 */ EQ(123, 3, 0),
/* l5 */ EQ(321, 2, 0),
/* l6 */ JUMPA(0),
/* l7 */ BPF_STMT(BPF_RET | BPF_K, SECCOMP_RET_ALLOW),
/* l8 */ BPF_STMT(BPF_RET | BPF_K, SECCOMP_RET_USER_NOTIF),
};
size = create_bfp_program(table, result,
sizeof(table) / sizeof(table[0]));
ck_assert_uint_eq(size, sizeof(expected) / sizeof(expected[0]));
ck_assert(filter_eq(expected, result,
sizeof(expected) / sizeof(expected[0])));
}
END_TEST
START_TEST(test_two_instr)
{
unsigned int size;
struct bpf_call calls[] = {
{ .name = "test1" },
{ .name = "test2" },
};
struct syscall_entry table[] = {
{ .count = 1, .nr = 42, .entry = &calls[0] },
{ .count = 1, .nr = 49, .entry = &calls[1] },
};
struct sock_filter expected[] = {
/* l0 */ BPF_STMT(BPF_LD | BPF_W | BPF_ABS,
(offsetof(struct seccomp_data, arch))),
/* l1 */
BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, SEITAN_AUDIT_ARCH, 0, 6),
/* l2 */
BPF_STMT(BPF_LD | BPF_W | BPF_ABS,
(offsetof(struct seccomp_data, nr))),
/* ------- level0 -------- */
/* l3 */ JGE(49, 1, 0),
/* ------- level0 -------- */
/* l4 */ EQ(42, 1, 3),
/* l5 */ EQ(49, 1, 2),
/* l6 */ JUMPA(1),
/* l7 */ JUMPA(0),
/* l8 */ BPF_STMT(BPF_RET | BPF_K, SECCOMP_RET_ALLOW),
/* l9 */ BPF_STMT(BPF_RET | BPF_K, SECCOMP_RET_USER_NOTIF),
};
struct sock_filter result[30];
size = create_bfp_program(table, result,
sizeof(table) / sizeof(table[0]));
ck_assert_uint_eq(size, sizeof(expected) / sizeof(expected[0]));
ck_assert(filter_eq(expected, result,
sizeof(expected) / sizeof(expected[0])));
}
END_TEST
START_TEST(test_multiple_instr_no_args)
{
unsigned int size;
struct bpf_call calls[] = {
{ .name = "test1" }, { .name = "test2" }, { .name = "test3" },
{ .name = "test4" }, { .name = "test5" },
};
struct syscall_entry table[] = {
{ .count = 1, .nr = 42, .entry = &calls[0] },
{ .count = 1, .nr = 43, .entry = &calls[1] },
{ .count = 1, .nr = 44, .entry = &calls[2] },
{ .count = 1, .nr = 45, .entry = &calls[3] },
{ .count = 1, .nr = 46, .entry = &calls[4] },
};
struct sock_filter expected[] = {
/* l0 */ BPF_STMT(BPF_LD | BPF_W | BPF_ABS,
(offsetof(struct seccomp_data, arch))),
/* l1 */
BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, SEITAN_AUDIT_ARCH, 0, 18),
/* l2 */
BPF_STMT(BPF_LD | BPF_W | BPF_ABS,
(offsetof(struct seccomp_data, nr))),
/* ------- level0 -------- */
/* l3 */ JGE(46, 1, 0),
/* ------- level1 -------- */
/* l4 */ JGE(45, 2, 1),
/* l5 */ JGE(46, 3, 2),
/* ------- level2 -------- */
/* l6 */ JGE(43, 4, 3),
/* l7 */ JGE(45, 5, 4),
/* l8 */ JGE(46, 6, 5),
/* l9 */ JUMPA(10),
/* -------- leaves ------- */
/* l10 */ EQ(42, 4, 9),
/* l11 */ EQ(43, 4, 8),
/* l12 */ EQ(44, 4, 7),
/* l13 */ EQ(45, 4, 6),
/* l14 */ EQ(46, 4, 5),
/* ------- args ---------- */
/* l15 */ JUMPA(4),
/* l16 */ JUMPA(3),
/* l17 */ JUMPA(2),
/* l18 */ JUMPA(1),
/* l19 */ JUMPA(0),
/* l20 */ BPF_STMT(BPF_RET | BPF_K, SECCOMP_RET_ALLOW),
/* l21 */ BPF_STMT(BPF_RET | BPF_K, SECCOMP_RET_USER_NOTIF),
};
struct sock_filter result[sizeof(expected) / sizeof(expected[0]) + 10];
size = create_bfp_program(table, result,
sizeof(table) / sizeof(table[0]));
ck_assert_uint_eq(size, sizeof(expected) / sizeof(expected[0]));
ck_assert(filter_eq(expected, result,
sizeof(expected) / sizeof(expected[0])));
}
END_TEST
START_TEST(test_multiple_instr_with_args)
{
unsigned int size;
struct bpf_call calls[] = {
{ .name = "test1",
.args = { 0, 123, 321, 0, 0, 0 },
.check_arg = { false, true, true, false, false, false } },
{ .name = "test2" },
{ .name = "test3" },
{ .name = "test4",
.args = { 0, 123, 321, 0, 0, 0 },
.check_arg = { false, true, true, false, false, false } },
{ .name = "test5" },
};
struct syscall_entry table[] = {
{ .count = 1, .nr = 42, .entry = &calls[0] },
{ .count = 1, .nr = 43, .entry = &calls[1] },
{ .count = 1, .nr = 44, .entry = &calls[2] },
{ .count = 1, .nr = 45, .entry = &calls[3] },
{ .count = 1, .nr = 46, .entry = &calls[4] },
};
struct sock_filter expected[] = {
/* l0 */ BPF_STMT(BPF_LD | BPF_W | BPF_ABS,
(offsetof(struct seccomp_data, arch))),
/* l1 */
BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, SEITAN_AUDIT_ARCH, 0, 22),
/* l2 */
BPF_STMT(BPF_LD | BPF_W | BPF_ABS,
(offsetof(struct seccomp_data, nr))),
/* ------- level0 -------- */
/* l3 */ JGE(46, 1, 0),
/* ------- level1 -------- */
/* l4 */ JGE(45, 2, 1),
/* l5 */ JGE(46, 3, 2),
/* ------- level2 -------- */
/* l6 */ JGE(43, 4, 3),
/* l7 */ JGE(45, 5, 4),
/* l8 */ JGE(46, 6, 5),
/* l9 */ JUMPA(14),
/* -------- leaves ------- */
/* l10 */ EQ(42, 4, 13),
/* l11 */ EQ(43, 6, 12),
/* l12 */ EQ(44, 6, 11),
/* l13 */ EQ(45, 6, 10),
/* l14 */ EQ(46, 8, 9),
/* ------- args ---------- */
/* l15 */ EQ(123, 9, 0),
/* l16 */ EQ(321, 8, 0),
/* l17 */ JUMPA(6),
/* l18 */ JUMPA(5),
/* l19 */ JUMPA(4),
/* l20 */ EQ(123, 4, 0),
/* l21 */ EQ(321, 3, 0),
/* l22 */ JUMPA(1),
/* l23 */ JUMPA(0),
/* l24 */ BPF_STMT(BPF_RET | BPF_K, SECCOMP_RET_ALLOW),
/* l25 */ BPF_STMT(BPF_RET | BPF_K, SECCOMP_RET_USER_NOTIF),
};
struct sock_filter result[sizeof(expected) / sizeof(expected[0]) + 10];
size = create_bfp_program(table, result,
sizeof(table) / sizeof(table[0]));
ck_assert_uint_eq(size, sizeof(expected) / sizeof(expected[0]));
ck_assert(filter_eq(expected, result,
sizeof(expected) / sizeof(expected[0])));
}
END_TEST
START_TEST(test_multiple_instance_same_instr)
{
unsigned int size;
struct bpf_call calls[] = {
{ .name = "test1",
.args = { 0, 123, 0, 0, 0, 0 },
.check_arg = { false, true, false, false, false, false } },
{ .name = "test1",
.args = { 0, 0, 321, 0, 0, 0 },
.check_arg = { false, false, true, false, false, false } },
{ .name = "test2" },
{ .name = "test3" },
{ .name = "test4",
.args = { 0, 123, 0, 0, 0, 0 },
.check_arg = { false, true, false, false, false, false } },
{ .name = "test4",
.args = { 0, 0, 321, 0, 0, 0 },
.check_arg = { false, false, true, false, false, false } },
{ .name = "test5" },
};
struct syscall_entry table[] = {
{ .count = 2, .nr = 42, .entry = &calls[0] },
{ .count = 1, .nr = 43, .entry = &calls[2] },
{ .count = 1, .nr = 44, .entry = &calls[3] },
{ .count = 2, .nr = 45, .entry = &calls[4] },
{ .count = 1, .nr = 46, .entry = &calls[6] },
};
struct sock_filter expected[] = {
/* l0 */ BPF_STMT(BPF_LD | BPF_W | BPF_ABS,
(offsetof(struct seccomp_data, arch))),
/* l1 */
BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, SEITAN_AUDIT_ARCH, 0, 22),
/* l2 */
BPF_STMT(BPF_LD | BPF_W | BPF_ABS,
(offsetof(struct seccomp_data, nr))),
/* ------- level0 -------- */
/* l3 */ JGE(46, 1, 0),
/* ------- level1 -------- */
/* l4 */ JGE(45, 2, 1),
/* l5 */ JGE(46, 3, 2),
/* ------- level2 -------- */
/* l6 */ JGE(43, 4, 3),
/* l7 */ JGE(45, 5, 4),
/* l8 */ JGE(46, 6, 5),
/* l9 */ JUMPA(14),
/* -------- leaves ------- */
/* l10 */ EQ(42, 4, 13),
/* l11 */ EQ(43, 6, 12),
/* l12 */ EQ(44, 6, 11),
/* l13 */ EQ(45, 6, 10),
/* l14 */ EQ(46, 8, 9),
/* ------- args ---------- */
/* l15 */ EQ(123, 9, 0),
/* l16 */ EQ(321, 8, 0),
/* l17 */ JUMPA(6),
/* l18 */ JUMPA(5),
/* l21 */ JUMPA(4),
/* l19 */ EQ(123, 4, 0),
/* l20 */ EQ(321, 3, 0),
/* l22 */ JUMPA(1),
/* l23 */ JUMPA(0),
/* l24 */ BPF_STMT(BPF_RET | BPF_K, SECCOMP_RET_ALLOW),
/* l25 */ BPF_STMT(BPF_RET | BPF_K, SECCOMP_RET_USER_NOTIF),
};
struct sock_filter result[sizeof(expected) / sizeof(expected[0]) + 10];
size = create_bfp_program(table, result,
sizeof(table) / sizeof(table[0]));
ck_assert_uint_eq(size, sizeof(expected) / sizeof(expected[0]));
ck_assert(filter_eq(expected, result,
sizeof(expected) / sizeof(expected[0])));
}
END_TEST
Suite *bpf_suite(void)
{
Suite *s;
TCase *tsingle_instr, *tmultiple_instr;
s = suite_create("Create BPF filter");
tsingle_instr = tcase_create("single instruction");
tmultiple_instr = tcase_create("multiple instructions");
tcase_add_test(tsingle_instr, test_single_instr);
tcase_add_test(tsingle_instr, test_single_instr_two_args);
tcase_add_test(tmultiple_instr, test_two_instr);
tcase_add_test(tmultiple_instr, test_multiple_instr_no_args);
tcase_add_test(tmultiple_instr, test_multiple_instr_with_args);
tcase_add_test(tmultiple_instr, test_multiple_instance_same_instr);
suite_add_tcase(s, tsingle_instr);
suite_add_tcase(s, tmultiple_instr);
return s;
}
int main(void)
{
int no_failed = 0;
Suite *s;
SRunner *runner;
s = bpf_suite();
runner = srunner_create(s);
srunner_run_all(runner, CK_VERBOSE);
no_failed = srunner_ntests_failed(runner);
srunner_free(runner);
return (no_failed == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
}