2e53f9d2f0
We have a couple of checks of the form:
if (offset+size > totalsize)
die();
We need to check that offset+size doesn't overflow, otherwise the check
will pass, and we may access past totalsize.
Found with AFL.
Signed-off-by: Anton Blanchard <anton@samba.org>
[Added a testcase]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
/*
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* dumptrees - utility for libfdt testing
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*
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* (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation. 2006.
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*
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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 the
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* 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 will 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 GNU
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* 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 to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdint.h>
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#include <libfdt.h>
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#include "testdata.h"
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struct {
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void *blob;
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const char *filename;
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} trees[] = {
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#define TREE(name) { &_##name, #name ".dtb" }
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TREE(test_tree1),
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TREE(bad_node_char), TREE(bad_node_format), TREE(bad_prop_char),
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TREE(ovf_size_strings),
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};
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#define NUM_TREES (sizeof(trees) / sizeof(trees[0]))
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int main(int argc, char *argv[])
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{
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int i;
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for (i = 0; i < NUM_TREES; i++) {
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void *blob = trees[i].blob;
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const char *filename = trees[i].filename;
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int size;
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int fd;
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int ret;
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size = fdt_totalsize(blob);
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printf("Tree \"%s\", %d bytes\n", filename, size);
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fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
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if (fd < 0)
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perror("open()");
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ret = write(fd, blob, size);
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if (ret != size)
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perror("write()");
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close(fd);
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}
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exit(0);
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}
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