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/*
$Id: maps.c,v 1.16 2007-06-05 01:45:35+01 taviso Exp $
Copyright (C) 2006,2007 Tavis Ormandy <taviso@sdf.lonestar.org>
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
#include <stdio.h>
#include <sys/types.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <alloca.h>
#include <stdbool.h>
#include "list.h"
#include "maps.h"
#include "scanmem.h"
bool readmaps(pid_t target, list_t * regions)
{
FILE *maps;
char name[32], *line = NULL;
size_t len = 0;
/* check if target is valid */
if (target == 0)
return false;
/* construct the maps filename */
snprintf(name, sizeof(name), "/proc/%u/maps", target);
/* attempt to open the maps file */
if ((maps = fopen(name, "r")) == NULL) {
fprintf(stderr, "error: failed to open maps file %s.\n", name);
return false;
}
eprintf("info: maps file located at %s opened.\n", name);
/* read every line of the maps file */
while (getline(&line, &len, maps) != -1) {
unsigned start, end;
region_t *map = NULL;
char read, write, exec, cow, *filename;
/* slight overallocation */
if ((filename = alloca(len)) == NULL) {
fprintf(stderr, "error: failed to allocate %u bytes for filename.\n", len);
goto error;
}
/* initialise to zero */
memset(filename, '\0', len);
/* parse each line */
if (sscanf(line, "%x-%x %c%c%c%c %*x %*s %*u %s", &start, &end, &read,
&write, &exec, &cow, filename) >= 6) {
/* must have permissions to read and write, and be non-zero size */
if (write == 'w' && read == 'r' && (end - start) > 0) {
/* allocate a new region structure */
if ((map = calloc(1, sizeof(region_t) + strlen(filename))) == NULL) {
fprintf(stderr, "error: failed to allocate memory for region.\n");
goto error;
}
/* initialise this region */
map->flags.read = true;
map->flags.write = true;
map->start = start;
map->size = (unsigned) (end - start);
/* setup other permissions */
map->flags.exec = (exec == 'x');
map->flags.shared = (cow == 's');
map->flags.private = (cow == 'p');
/* save pathname */
if (strlen(filename) != 0) {
/* the pathname is concatenated with the structure */
if ((map = realloc(map, sizeof(*map) + strlen(filename))) == NULL) {
fprintf(stderr, "error: failed to allocate memory.\n");
goto error;
}
strcpy(map->filename, filename);
}
/* add a unique identifier */
map->id = regions->size;
/* okay, add this guy to our list */
if (l_append(regions, regions->tail, map) == -1) {
fprintf(stderr, "error: failed to save region.\n");
goto error;
}
}
}
}
eprintf("info: %d suitable regions found.\n", regions->size);
/* release memory allocated */
free(line);
fclose(maps);
return true;
error:
free(line);
fclose(maps);
return false;
}
int compare_region_id(const region_t *a, const region_t *b)
{
return (int) (a->id - b->id);
}
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