/usr/src/lime-forensics-1.3~svn.r21-2/disk.c is in lime-forensics-dkms 1.3~svn.r21-2.
This file is owned by root:root, with mode 0o644.
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* LiME - Linux Memory Extractor
* Copyright (c) 2011-2014 Joe Sylve - 504ENSICS Labs
*
*
* Author:
* Joe Sylve - joe.sylve@gmail.com, @jtsylve
*
* 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; either version 2 of the License, or (at
* your option) any later version.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "lime.h"
int write_vaddr_disk(void *, size_t);
int setup_disk(void);
void cleanup_disk(void);
static void disable_dio(void);
static struct file * f = NULL;
extern char * path;
extern int dio;
static int reopen = 0;
static void disable_dio() {
DBG("Direct IO may not be supported on this file system. Retrying.");
dio = 0;
reopen = 1;
cleanup_disk();
setup_disk();
}
int setup_disk() {
mm_segment_t fs;
int err;
fs = get_fs();
set_fs(KERNEL_DS);
if (dio && reopen) {
f = filp_open(path, O_WRONLY | O_CREAT | O_LARGEFILE | O_SYNC | O_DIRECT, 0444);
} else if (dio) {
f = filp_open(path, O_WRONLY | O_CREAT | O_LARGEFILE | O_TRUNC | O_SYNC | O_DIRECT, 0444);
}
if(!dio || (f == ERR_PTR(-EINVAL))) {
DBG("Direct IO Disabled");
f = filp_open(path, O_WRONLY | O_CREAT | O_LARGEFILE | O_TRUNC, 0444);
dio = 0;
}
if (!f || IS_ERR(f)) {
DBG("Error opening file %ld", PTR_ERR(f));
set_fs(fs);
err = (f) ? PTR_ERR(f) : -EIO;
f = NULL;
return err;
}
set_fs(fs);
return 0;
}
void cleanup_disk() {
mm_segment_t fs;
fs = get_fs();
set_fs(KERNEL_DS);
if(f) filp_close(f, NULL);
set_fs(fs);
}
int write_vaddr_disk(void * v, size_t is) {
mm_segment_t fs;
long s;
loff_t pos;
fs = get_fs();
set_fs(KERNEL_DS);
pos = f->f_pos;
s = vfs_write(f, v, is, &pos);
if (s == is) {
f->f_pos = pos;
}
set_fs(fs);
if (s != is && dio) {
disable_dio();
f->f_pos = pos;
return write_vaddr_disk(v, is);
}
return s;
}
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