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141 lines
3.4 KiB
141 lines
3.4 KiB
/*
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* Copyright (c) 2013 Oracle and/or its affiliates. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Author: Alexey Kodanev <alexey.kodanev@oracle.com>
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*
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*/
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/uaccess.h>
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#include "ltp_uaccess.h"
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MODULE_AUTHOR("Alexey Kodanev <alexey.kodanev@oracle.com>");
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MODULE_DESCRIPTION("User-space access LTP test");
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MODULE_LICENSE("GPL");
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#define prk_err(fmt, ...) \
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pr_err(DEV_NAME ": " fmt "\n", ##__VA_ARGS__)
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#define prk_info(fmt, ...) \
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pr_info(DEV_NAME ": " fmt "\n", ##__VA_ARGS__)
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/*
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* Test-case result,
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* if test is passed, value will be set to 0
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*/
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static int test_result;
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static void device_release(struct device *dev)
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{
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prk_info("device released");
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}
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static struct device tdev = {
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.init_name = DEV_NAME,
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.release = device_release
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};
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static ssize_t sys_result(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return scnprintf(buf, PAGE_SIZE, "%d\n", test_result);
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}
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static DEVICE_ATTR(result, S_IRUSR, sys_result, NULL);
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static ssize_t sys_tcase(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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unsigned long ptr = 0;
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int tc = 0;
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char *str, ch, buffer[str_size];
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sscanf(buf, "%d %lu", &tc, &ptr);
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str = (char *) ptr;
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test_result = 0;
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switch (tc) {
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case TC_READ_USER:
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if (copy_from_user(buffer, str, str_size))
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prk_err("copy_from_user() failed");
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test_result = strncmp(test_str, buffer, str_size) ? 1 : 0;
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if (get_user(ch, str))
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prk_err("get_user() failed");
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test_result |= ch != test_str[0];
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break;
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case TC_WRITE_USER:
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if (copy_to_user(str + 1, test_str + 1, str_size - 1)) {
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prk_err("copy_to_user() failed");
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test_result = 1;
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}
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/* write the first skipped character */
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if (put_user(test_str[0], str)) {
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prk_err("put_user() failed");
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test_result |= 1;
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}
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break;
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}
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return count;
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}
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static DEVICE_ATTR(tcase, S_IWUSR, NULL, sys_tcase);
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static int uaccess_init(void)
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{
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int err = 0;
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prk_info("Starting module");
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err = device_register(&tdev);
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if (err) {
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prk_err("Unable to register device");
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goto err0;
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}
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prk_info("device registered");
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err = device_create_file(&tdev, &dev_attr_result);
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if (err) {
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prk_err("Can't create sysfs file 'result'");
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goto err1;
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}
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err = device_create_file(&tdev, &dev_attr_tcase);
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if (err) {
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prk_err(": Can't create sysfs file 'tc'");
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goto err2;
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}
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return 0;
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err2:
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device_remove_file(&tdev, &dev_attr_result);
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err1:
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device_unregister(&tdev);
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err0:
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return err;
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}
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module_init(uaccess_init)
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static void uaccess_exit(void)
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{
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prk_info("Unloading module");
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device_remove_file(&tdev, &dev_attr_result);
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device_remove_file(&tdev, &dev_attr_tcase);
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device_unregister(&tdev);
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}
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module_exit(uaccess_exit)
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