57 строки
1.5 KiB
C
57 строки
1.5 KiB
C
/*
|
|
* rodata_test.c: functional test for mark_rodata_ro function
|
|
*
|
|
* (C) Copyright 2008 Intel Corporation
|
|
* Author: Arjan van de Ven <arjan@linux.intel.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; version 2
|
|
* of the License.
|
|
*/
|
|
#include <linux/uaccess.h>
|
|
#include <asm/sections.h>
|
|
|
|
const int rodata_test_data = 0xC3;
|
|
EXPORT_SYMBOL_GPL(rodata_test_data);
|
|
|
|
void rodata_test(void)
|
|
{
|
|
unsigned long start, end;
|
|
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("rodata_test: test 1 fails (start data)\n");
|
|
return;
|
|
}
|
|
|
|
/* test 2: write to the variable; this should fault */
|
|
if (!probe_kernel_write((void *)&rodata_test_data,
|
|
(void *)&zero, sizeof(zero))) {
|
|
pr_err("rodata_test: test data was not read only\n");
|
|
return;
|
|
}
|
|
|
|
/* test 3: check the value hasn't changed */
|
|
if (rodata_test_data == zero) {
|
|
pr_err("rodata_test: test data was changed\n");
|
|
return;
|
|
}
|
|
|
|
/* test 4: check if the rodata section is PAGE_SIZE aligned */
|
|
start = (unsigned long)__start_rodata;
|
|
end = (unsigned long)__end_rodata;
|
|
if (start & (PAGE_SIZE - 1)) {
|
|
pr_err("rodata_test: start of .rodata is not page size aligned\n");
|
|
return;
|
|
}
|
|
if (end & (PAGE_SIZE - 1)) {
|
|
pr_err("rodata_test: end of .rodata is not page size aligned\n");
|
|
return;
|
|
}
|
|
|
|
pr_info("rodata_test: all tests were successful\n");
|
|
}
|