/usr/src/lttng-modules-2.7.1/wrapper/random.c is in lttng-modules-dkms 2.7.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* wrapper/random.c
*
* wrapper around bootid read. Using KALLSYMS to get its address when
* available, else we need to have a kernel that exports this function to GPL
* modules.
*
* Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; only
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* boot_id depends on sysctl */
#if defined(CONFIG_SYSCTL)
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/sched.h>
#include <linux/uaccess.h>
#include "random.h"
/*
* Returns string boot id.
*/
int wrapper_get_bootid(char *bootid)
{
struct file *file;
int ret;
ssize_t len;
mm_segment_t old_fs;
file = filp_open("/proc/sys/kernel/random/boot_id", O_RDONLY, 0);
if (IS_ERR(file))
return PTR_ERR(file);
old_fs = get_fs();
set_fs(KERNEL_DS);
if (!file->f_op || !file->f_op->read) {
ret = -EINVAL;
goto end;
}
len = file->f_op->read(file, bootid, BOOT_ID_LEN - 1, &file->f_pos);
if (len != BOOT_ID_LEN - 1) {
ret = -EINVAL;
goto end;
}
bootid[BOOT_ID_LEN - 1] = '\0';
ret = 0;
end:
set_fs(old_fs);
filp_close(file, current->files);
return ret;
}
#else
int wrapper_get_bootid(char *bootid)
{
return -ENOSYS;
}
#endif
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