mirror of
https://github.com/AsahiLinux/u-boot
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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>
105 lines
2.9 KiB
C
105 lines
2.9 KiB
C
/*
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* (C) Copyright 2007
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* Stefan Roese, DENX Software Engineering, sr@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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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
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* the 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
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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,
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* MA 02111-1307 USA
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*/
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#include <config.h>
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#include <common.h>
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#include <command.h>
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#include <asm/processor.h>
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#include <asm/io.h>
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#include <asm/gpio.h>
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#include <i2c.h>
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#if defined(CONFIG_ZEUS)
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u8 buf_zeus_ce[] = {
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/*00 01 02 03 04 05 06 07 */
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0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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/*08 09 0a 0b 0c 0d 0e 0f */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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/*10 11 12 13 14 15 16 17 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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/*18 19 1a 1b 1c 1d 1e 1f */
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0x00, 0xc0, 0x50, 0x12, 0x72, 0x3e, 0x00, 0x00 };
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u8 buf_zeus_pe[] = {
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/* CPU_CLOCK_DIV 1 = 00
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CPU_PLB_FREQ_DIV 3 = 10
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OPB_PLB_FREQ_DIV 2 = 01
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EBC_PLB_FREQ_DIV 2 = 00
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MAL_PLB_FREQ_DIV 1 = 00
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PCI_PLB_FRQ_DIV 3 = 10
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PLL_PLLOUTA = IS SET
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PLL_OPERATING = IS NOT SET
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PLL_FDB_MUL 10 = 1010
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PLL_FWD_DIV_A 3 = 101
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PLL_FWD_DIV_B 3 = 101
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TUNE = 0x2be */
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/*00 01 02 03 04 05 06 07 */
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0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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/*08 09 0a 0b 0c 0d 0e 0f */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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/*10 11 12 13 14 15 16 17 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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/*18 19 1a 1b 1c 1d 1e 1f */
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0x00, 0x60, 0x68, 0x2d, 0x42, 0xbe, 0x00, 0x00 };
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static int update_boot_eeprom(void)
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{
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u32 len = 0x20;
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u8 chip = CONFIG_SYS_I2C_EEPROM_ADDR;
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u8 *pbuf;
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u8 base;
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int i;
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if (in_be32((void *)GPIO0_IR) & GPIO_VAL(CONFIG_SYS_GPIO_ZEUS_PE)) {
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pbuf = buf_zeus_pe;
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base = 0x40;
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} else {
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pbuf = buf_zeus_ce;
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base = 0x00;
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}
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for (i = 0; i < len; i++, base++) {
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if (i2c_write(chip, base, 1, &pbuf[i], 1) != 0) {
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printf("i2c_write fail\n");
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return 1;
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}
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udelay(11000);
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}
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return 0;
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}
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int do_update_boot_eeprom(cmd_tbl_t* cmdtp, int flag, int argc, char * const argv[])
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{
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return update_boot_eeprom();
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}
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U_BOOT_CMD (
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update_boot_eeprom, 1, 1, do_update_boot_eeprom,
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"update boot eeprom content",
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""
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);
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#endif
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