116 lines
2.2 KiB
C
116 lines
2.2 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Copyright (C) 2020 Google LLC.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <test_progs.h>
|
||
|
|
#include <sys/mman.h>
|
||
|
|
#include <sys/wait.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <malloc.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
|
||
|
|
#include "lsm.skel.h"
|
||
|
|
|
||
|
|
char *CMD_ARGS[] = {"true", NULL};
|
||
|
|
|
||
|
|
#define GET_PAGE_ADDR(ADDR, PAGE_SIZE) \
|
||
|
|
(char *)(((unsigned long) (ADDR + PAGE_SIZE)) & ~(PAGE_SIZE-1))
|
||
|
|
|
||
|
|
int stack_mprotect(void)
|
||
|
|
{
|
||
|
|
void *buf;
|
||
|
|
long sz;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
sz = sysconf(_SC_PAGESIZE);
|
||
|
|
if (sz < 0)
|
||
|
|
return sz;
|
||
|
|
|
||
|
|
buf = alloca(sz * 3);
|
||
|
|
ret = mprotect(GET_PAGE_ADDR(buf, sz), sz,
|
||
|
|
PROT_READ | PROT_WRITE | PROT_EXEC);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
int exec_cmd(int *monitored_pid)
|
||
|
|
{
|
||
|
|
int child_pid, child_status;
|
||
|
|
|
||
|
|
child_pid = fork();
|
||
|
|
if (child_pid == 0) {
|
||
|
|
*monitored_pid = getpid();
|
||
|
|
execvp(CMD_ARGS[0], CMD_ARGS);
|
||
|
|
return -EINVAL;
|
||
|
|
} else if (child_pid > 0) {
|
||
|
|
waitpid(child_pid, &child_status, 0);
|
||
|
|
return child_status;
|
||
|
|
}
|
||
|
|
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int test_lsm(struct lsm *skel)
|
||
|
|
{
|
||
|
|
struct bpf_link *link;
|
||
|
|
int buf = 1234;
|
||
|
|
int err;
|
||
|
|
|
||
|
|
err = lsm__attach(skel);
|
||
|
|
if (!ASSERT_OK(err, "attach"))
|
||
|
|
return err;
|
||
|
|
|
||
|
|
/* Check that already linked program can't be attached again. */
|
||
|
|
link = bpf_program__attach(skel->progs.test_int_hook);
|
||
|
|
if (!ASSERT_ERR_PTR(link, "attach_link"))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
err = exec_cmd(&skel->bss->monitored_pid);
|
||
|
|
if (!ASSERT_OK(err, "exec_cmd"))
|
||
|
|
return err;
|
||
|
|
|
||
|
|
ASSERT_EQ(skel->bss->bprm_count, 1, "bprm_count");
|
||
|
|
|
||
|
|
skel->bss->monitored_pid = getpid();
|
||
|
|
|
||
|
|
err = stack_mprotect();
|
||
|
|
if (!ASSERT_EQ(errno, EPERM, "stack_mprotect"))
|
||
|
|
return err;
|
||
|
|
|
||
|
|
ASSERT_EQ(skel->bss->mprotect_count, 1, "mprotect_count");
|
||
|
|
|
||
|
|
syscall(__NR_setdomainname, &buf, -2L);
|
||
|
|
syscall(__NR_setdomainname, 0, -3L);
|
||
|
|
syscall(__NR_setdomainname, ~0L, -4L);
|
||
|
|
|
||
|
|
ASSERT_EQ(skel->bss->copy_test, 3, "copy_test");
|
||
|
|
|
||
|
|
lsm__detach(skel);
|
||
|
|
|
||
|
|
skel->bss->copy_test = 0;
|
||
|
|
skel->bss->bprm_count = 0;
|
||
|
|
skel->bss->mprotect_count = 0;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void test_test_lsm(void)
|
||
|
|
{
|
||
|
|
struct lsm *skel = NULL;
|
||
|
|
int err;
|
||
|
|
|
||
|
|
skel = lsm__open_and_load();
|
||
|
|
if (!ASSERT_OK_PTR(skel, "lsm_skel_load"))
|
||
|
|
goto close_prog;
|
||
|
|
|
||
|
|
err = test_lsm(skel);
|
||
|
|
if (!ASSERT_OK(err, "test_lsm_first_attach"))
|
||
|
|
goto close_prog;
|
||
|
|
|
||
|
|
err = test_lsm(skel);
|
||
|
|
ASSERT_OK(err, "test_lsm_second_attach");
|
||
|
|
|
||
|
|
close_prog:
|
||
|
|
lsm__destroy(skel);
|
||
|
|
}
|