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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>
109 lines
2.5 KiB
C
109 lines
2.5 KiB
C
/*
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* (C) Copyright 2000
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* Wolfgang Denk, DENX Software Engineering, wd@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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/*
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* Cache support: switch on or off, get status
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*/
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#include <common.h>
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#include <command.h>
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static int on_off (const char *);
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int do_icache ( cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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switch (argc) {
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case 2: /* on / off */
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switch (on_off(argv[1])) {
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#if 0 /* prevented by varargs handling; FALLTROUGH is harmless, too */
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default: cmd_usage(cmdtp);
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return;
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#endif
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case 0: icache_disable();
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break;
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case 1: icache_enable ();
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break;
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}
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/* FALL TROUGH */
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case 1: /* get status */
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printf ("Instruction Cache is %s\n",
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icache_status() ? "ON" : "OFF");
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return 0;
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default:
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cmd_usage(cmdtp);
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return 1;
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}
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return 0;
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}
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int do_dcache ( cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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switch (argc) {
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case 2: /* on / off */
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switch (on_off(argv[1])) {
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#if 0 /* prevented by varargs handling; FALLTROUGH is harmless, too */
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default: cmd_usage(cmdtp);
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return;
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#endif
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case 0: dcache_disable();
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break;
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case 1: dcache_enable ();
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break;
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}
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/* FALL TROUGH */
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case 1: /* get status */
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printf ("Data (writethrough) Cache is %s\n",
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dcache_status() ? "ON" : "OFF");
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return 0;
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default:
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cmd_usage(cmdtp);
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return 1;
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}
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return 0;
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}
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static int on_off (const char *s)
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{
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if (strcmp(s, "on") == 0) {
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return (1);
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} else if (strcmp(s, "off") == 0) {
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return (0);
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}
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return (-1);
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}
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U_BOOT_CMD(
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icache, 2, 1, do_icache,
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"enable or disable instruction cache",
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"[on, off]\n"
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" - enable or disable instruction cache"
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);
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U_BOOT_CMD(
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dcache, 2, 1, do_dcache,
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"enable or disable data cache",
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"[on, off]\n"
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" - enable or disable data (writethrough) cache"
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);
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