mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-12 22:26:16 +09:00
54841ab50c
The hush shell dynamically allocates (and re-allocates) memory for the
argument strings in the "char *argv[]" argument vector passed to
commands. Any code that modifies these pointers will cause serious
corruption of the malloc data structures and crash U-Boot, so make
sure the compiler can check that no such modifications are being done
by changing the code into "char * const argv[]".
This modification is the result of debugging a strange crash caused
after adding a new command, which used the following argument
processing code which has been working perfectly fine in all Unix
systems since version 6 - but not so in U-Boot:
int main (int argc, char **argv)
{
while (--argc > 0 && **++argv == '-') {
/* ====> */ while (*++*argv) {
switch (**argv) {
case 'd':
debug++;
break;
...
default:
usage ();
}
}
}
...
}
The line marked "====>" will corrupt the malloc data structures and
usually cause U-Boot to crash when the next command gets executed by
the shell. With the modification, the compiler will prevent this with
an
error: increment of read-only location '*argv'
N.B.: The code above can be trivially rewritten like this:
while (--argc > 0 && **++argv == '-') {
char *arg = *argv;
while (*++arg) {
switch (*arg) {
...
Signed-off-by: Wolfgang Denk <wd@denx.de>
Acked-by: Mike Frysinger <vapier@gentoo.org>
95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
/*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* Copyright (C) 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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
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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 to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <common.h>
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#include <command.h>
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#include <image.h>
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#include <u-boot/zlib.h>
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#include <asm/byteorder.h>
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#include <asm/zimage.h>
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/*cmd_boot.c*/
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int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
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{
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void *base_ptr;
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ulong os_data, os_len;
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image_header_t *hdr;
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#if defined(CONFIG_FIT)
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const void *data;
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size_t len;
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#endif
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if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
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return 1;
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if (images->legacy_hdr_valid) {
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hdr = images->legacy_hdr_os;
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if (image_check_type (hdr, IH_TYPE_MULTI)) {
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/* if multi-part image, we need to get first subimage */
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image_multi_getimg (hdr, 0, &os_data, &os_len);
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} else {
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/* otherwise get image data */
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os_data = image_get_data (hdr);
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os_len = image_get_data_size (hdr);
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}
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#if defined(CONFIG_FIT)
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} else if (images->fit_uname_os) {
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ret = fit_image_get_data (images->fit_hdr_os,
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images->fit_noffset_os, &data, &len);
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if (ret) {
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puts ("Can't get image data/size!\n");
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goto error;
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}
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os_data = (ulong)data;
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os_len = (ulong)len;
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#endif
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} else {
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puts ("Could not find kernel image!\n");
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goto error;
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}
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base_ptr = load_zimage ((void*)os_data, os_len,
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images->rd_start, images->rd_end - images->rd_start, 0);
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if (NULL == base_ptr) {
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printf ("## Kernel loading failed ...\n");
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goto error;
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}
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#ifdef DEBUG
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printf ("## Transferring control to Linux (at address %08x) ...\n",
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(u32)base_ptr);
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#endif
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/* we assume that the kernel is in place */
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printf("\nStarting kernel ...\n\n");
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boot_zimage(base_ptr);
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/* does not return */
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error:
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return 1;
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}
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