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// 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;
}
void test_test_lsm(void)
{
struct lsm *skel = NULL;
int err, duration = 0;
skel = lsm__open_and_load();
if (CHECK(!skel, "skel_load", "lsm skeleton failed\n"))
goto close_prog;
err = lsm__attach(skel);
if (CHECK(err, "attach", "lsm attach failed: %d\n", err))
goto close_prog;
err = exec_cmd(&skel->bss->monitored_pid);
if (CHECK(err < 0, "exec_cmd", "err %d errno %d\n", err, errno))
goto close_prog;
CHECK(skel->bss->bprm_count != 1, "bprm_count", "bprm_count = %d\n",
skel->bss->bprm_count);
skel->bss->monitored_pid = getpid();
err = stack_mprotect();
if (CHECK(errno != EPERM, "stack_mprotect", "want err=EPERM, got %d\n",
errno))
goto close_prog;
CHECK(skel->bss->mprotect_count != 1, "mprotect_count",
"mprotect_count = %d\n", skel->bss->mprotect_count);
close_prog:
lsm__destroy(skel);
}
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