mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-15 09:27:35 +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>
|
||
|---|---|---|
| .. | ||
| 4xx_ibm_ddr2_autocalib.c | ||
| 4xx_pci.c | ||
| 4xx_pcie.c | ||
| 4xx_uart.c | ||
| 40x_spd_sdram.c | ||
| 44x_spd_ddr.c | ||
| 44x_spd_ddr2.c | ||
| bedbug_405.c | ||
| cache.S | ||
| cmd_chip_config.c | ||
| commproc.c | ||
| config.mk | ||
| cpu.c | ||
| cpu_init.c | ||
| dcr.S | ||
| denali_data_eye.c | ||
| denali_spd_ddr2.c | ||
| ecc.c | ||
| ecc.h | ||
| fdt.c | ||
| gpio.c | ||
| interrupts.c | ||
| iop480_uart.c | ||
| kgdb.S | ||
| Makefile | ||
| miiphy.c | ||
| reginfo.c | ||
| resetvec.S | ||
| sdram.c | ||
| sdram.h | ||
| speed.c | ||
| start.S | ||
| tlb.c | ||
| traps.c | ||
| u-boot.lds | ||
| uic.c | ||
| usb.c | ||
| usb_ohci.c | ||
| usb_ohci.h | ||
| usbdev.c | ||
| usbdev.h | ||
| xilinx_irq.c | ||