53 строки
1.2 KiB
C
53 строки
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* rodata_test.c: functional test for mark_rodata_ro function
|
|
*
|
|
* (C) Copyright 2008 Intel Corporation
|
|
* Author: Arjan van de Ven <arjan@linux.intel.com>
|
|
*/
|
|
#define pr_fmt(fmt) "rodata_test: " fmt
|
|
|
|
#include <linux/rodata_test.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/mm.h>
|
|
#include <asm/sections.h>
|
|
|
|
static const int rodata_test_data = 0xC3;
|
|
|
|
void rodata_test(void)
|
|
{
|
|
int zero = 0;
|
|
|
|
/* test 1: read the value */
|
|
/* If this test fails, some previous testrun has clobbered the state */
|
|
if (!rodata_test_data) {
|
|
pr_err("test 1 fails (start data)\n");
|
|
return;
|
|
}
|
|
|
|
/* test 2: write to the variable; this should fault */
|
|
if (!copy_to_kernel_nofault((void *)&rodata_test_data,
|
|
(void *)&zero, sizeof(zero))) {
|
|
pr_err("test data was not read only\n");
|
|
return;
|
|
}
|
|
|
|
/* test 3: check the value hasn't changed */
|
|
if (rodata_test_data == zero) {
|
|
pr_err("test data was changed\n");
|
|
return;
|
|
}
|
|
|
|
/* test 4: check if the rodata section is PAGE_SIZE aligned */
|
|
if (!PAGE_ALIGNED(__start_rodata)) {
|
|
pr_err("start of .rodata is not page size aligned\n");
|
|
return;
|
|
}
|
|
if (!PAGE_ALIGNED(__end_rodata)) {
|
|
pr_err("end of .rodata is not page size aligned\n");
|
|
return;
|
|
}
|
|
|
|
pr_info("all tests were successful\n");
|
|
}
|