https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 30a0b95b1335e12efef89dd78518ed3e4a71a763 authored by Linus Torvalds on 30 October 2022, 22:19:28 UTC
Linux 6.1-rc3
Linux 6.1-rc3
Tip revision: 30a0b95
rodata_test.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");
}