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/* SPDX-License-Identifier: GPL-3.0-or-later
* Copyright 2023 Red Hat GmbH
* Author: Alice Frosi <afrosi@redhat.com>
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <fcntl.h>
#include <sys/syscall.h>
#include <sys/mman.h>
#include <sys/resource.h>
#include <check.h>
#include "gluten.h"
#include "common.h"
#include "testutil.h"
#include "filter.h"
#include "disasm.h"
static int generate_install_filter(struct args_target *at)
{
struct bpf_call calls[1];
struct syscall_entry table[] = {
{ .count = 1, .nr = at->nr, .entry = &calls[0] }
};
struct sock_filter filter[30];
unsigned int size;
memcpy(&calls[0].args, &at->args, sizeof(calls[0].args));
size = create_bfp_program(table, filter, 1);
return install_filter(filter, size);
}
START_TEST(no_args)
{
at = mmap(NULL, sizeof(struct args_target), PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, -1, 0);
at->check_fd = false;
at->nr = __NR_getpid;
set_args_no_check(at);
at->install_filter = generate_install_filter;
setup();
mock_syscall_target();
}
END_TEST
START_TEST(with_getsid)
{
int id = 12345;
at = mmap(NULL, sizeof(struct args_target), PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, -1, 0);
at->check_fd = false;
at->nr = __NR_getsid;
set_args_no_check(at);
at->args[0].type = U32;
at->args[0].value.v32 = id;
at->args[0].cmp = EQ;
at->targs[0] = (void *)(long)id;
at->install_filter = generate_install_filter;
setup();
mock_syscall_target();
}
END_TEST
START_TEST(with_getsid_gt)
{
at = mmap(NULL, sizeof(struct args_target), PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, -1, 0);
at->check_fd = false;
at->nr = __NR_getsid;
set_args_no_check(at);
at->args[0].type = U32;
at->args[0].value.v32 = 0x1;
at->args[0].cmp = GT;
at->targs[0] = (void *)(long)0x10;
at->install_filter = generate_install_filter;
setup();
mock_syscall_target();
}
END_TEST
START_TEST(with_getpriority)
{
int which = 0x12345;
id_t who = PRIO_PROCESS;
at = mmap(NULL, sizeof(struct args_target), PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, -1, 0);
at->check_fd = false;
at->nr = __NR_getpriority;
set_args_no_check(at);
at->args[0].value.v32 = which;
at->args[0].type = U32;
at->args[0].cmp = EQ;
at->args[1].value.v32 = who;
at->args[1].type = U32;
at->args[1].cmp = EQ;
at->targs[0] = (void *)(long)which;
at->targs[1] = (void *)(long)who;
at->install_filter = generate_install_filter;
setup();
mock_syscall_target();
}
END_TEST
static int target_lseek()
{
int fd = open("/dev/zero", O_RDWR);
/* Open the device on the target, but the arg0 isn't in the filter */
ck_assert_int_ge(fd, 0);
at->targs[0] = (void *)(long)fd;
return target();
}
static void test_lseek(off_t offset)
{
at = mmap(NULL, sizeof(struct args_target), PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, -1, 0);
at->check_fd = false;
at->nr = __NR_lseek;
at->target = target_lseek;
set_args_no_check(at);
at->args[1].value.v64 = offset;
at->args[1].type = U64;
at->args[1].cmp = EQ;
at->targs[1] = (void *)(long)offset;
at->install_filter = generate_install_filter;
setup();
mock_syscall_target();
}
START_TEST(with_lseek_lo)
{
test_lseek(0x1);
}
END_TEST
START_TEST(with_lseek_hi)
{
test_lseek(0x0000000100000000);
}
END_TEST
Suite *op_call_suite(void)
{
Suite *s;
int timeout = 30;
TCase *simple, *args32, *args64, *gt32;
s = suite_create("Test filter with target");
simple = tcase_create("no args");
tcase_add_checked_fixture(simple, NULL, teardown);
tcase_set_timeout(simple, timeout);
tcase_add_test(simple, no_args);
suite_add_tcase(s, simple);
args32 = tcase_create("with args 32 bit");
tcase_add_checked_fixture(args32, NULL, teardown);
tcase_set_timeout(args32, timeout);
tcase_add_test(args32, with_getsid);
tcase_add_test(args32, with_getpriority);
suite_add_tcase(s, args32);
args64 = tcase_create("with args 64 bit");
tcase_add_checked_fixture(args64, NULL, teardown);
tcase_set_timeout(args32, timeout);
tcase_add_test(args64, with_lseek_lo);
tcase_add_test(args64, with_lseek_hi);
suite_add_tcase(s, args64);
gt32 = tcase_create("with args 32 bit and gt");
tcase_add_checked_fixture(gt32, NULL, teardown);
tcase_set_timeout(gt32, timeout);
tcase_add_test(gt32, with_getsid_gt);
suite_add_tcase(s, gt32);
return s;
}
int main(void)
{
int no_failed = 0;
Suite *s;
SRunner *runner;
s = op_call_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;
}
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