Release 4.11 mm/rodata_test.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");
}
Contributors
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Arjan van de Ven
92
65.71%
1
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Jinbum Park
48
34.29%
1
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Total
140
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2
100.00%

Overall Contributors
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CommitProp
Arjan van de Ven
95
60.13%
1
33.33%
Jinbum Park
61
38.61%
1
33.33%
Harvey Harrison
2
1.27%
1
33.33%
Total
158
100.00%
3
100.00%
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