mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-16 01:38:22 +00:00
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>
76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
/*
|
|
* (C) Copyright 2002
|
|
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/*
|
|
* Diagnostics support
|
|
*/
|
|
#include <common.h>
|
|
#include <command.h>
|
|
#include <post.h>
|
|
|
|
int do_diag (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
|
|
{
|
|
unsigned int i;
|
|
|
|
if (argc == 1 || strcmp (argv[1], "run") != 0) {
|
|
/* List test info */
|
|
if (argc == 1) {
|
|
puts ("Available hardware tests:\n");
|
|
post_info (NULL);
|
|
puts ("Use 'diag [<test1> [<test2> ...]]'"
|
|
" to get more info.\n");
|
|
puts ("Use 'diag run [<test1> [<test2> ...]]'"
|
|
" to run tests.\n");
|
|
} else {
|
|
for (i = 1; i < argc; i++) {
|
|
if (post_info (argv[i]) != 0)
|
|
printf ("%s - no such test\n", argv[i]);
|
|
}
|
|
}
|
|
} else {
|
|
/* Run tests */
|
|
if (argc == 2) {
|
|
post_run (NULL, POST_RAM | POST_MANUAL);
|
|
} else {
|
|
for (i = 2; i < argc; i++) {
|
|
if (post_run (argv[i], POST_RAM | POST_MANUAL) != 0)
|
|
printf ("%s - unable to execute the test\n",
|
|
argv[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
/***************************************************/
|
|
|
|
U_BOOT_CMD(
|
|
diag, CONFIG_SYS_MAXARGS, 0, do_diag,
|
|
"perform board diagnostics",
|
|
" - print list of available tests\n"
|
|
"diag [test1 [test2]]\n"
|
|
" - print information about specified tests\n"
|
|
"diag run - run all available tests\n"
|
|
"diag run [test1 [test2]]\n"
|
|
" - run specified tests"
|
|
);
|