mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-10 13:16:16 +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>
105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
/*
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* (C) Copyright 2001
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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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* Command to load a splash screen to the VFDs.
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* NOTE that this will be controlled by a key combination when
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* the keyboard stuff works. For now the user has to enter a
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* bitmap number (only VFD_TEST_LOGO is supported now - 16.10.2002).
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* Added VFD_REMOTE_LOGO (same as VFD_TEST_LOGO but a different color)
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* on 20.10.2002.
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*
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* This rather crudely requires that each bitmap be included as a
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* header file.
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*/
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#include <common.h>
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#include <command.h>
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#if defined(CONFIG_CMD_VFD)
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#include <vfd_logo.h>
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#define VFD_TEST_LOGO_BMPNR 0
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#define VFD_REMOTE_LOGO_BMPNR 1
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extern int transfer_pic(unsigned char, unsigned char *, int, int);
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int trab_vfd (ulong bitmap);
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int do_vfd (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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ulong bitmap;
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if (argc != 2) {
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cmd_usage(cmdtp);
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return 1;
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}
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if (argv[1][0] == '/') { /* select bitmap by number */
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bitmap = simple_strtoul(argv[1]+1, NULL, 10);
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return (trab_vfd(bitmap));
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}
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/* display bitmap at given address */
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bitmap = simple_strtoul(argv[1], NULL, 16);
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transfer_pic(3, (uchar *)bitmap, VFD_LOGO_HEIGHT, VFD_LOGO_WIDTH);
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return 0;
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}
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U_BOOT_CMD(
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vfd, 2, 0, do_vfd,
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"load a bitmap to the VFDs on TRAB",
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"/N\n"
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" - load bitmap N to the VFDs (N is _decimal_ !!!)\n"
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"vfd ADDR\n"
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" - load bitmap at address ADDR"
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);
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#endif
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int trab_vfd (ulong bitmap)
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{
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uchar *addr;
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char *s;
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switch (bitmap) {
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case VFD_TEST_LOGO_BMPNR:
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if ((s = getenv ("bitmap0")) != NULL) {
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addr = (uchar *)simple_strtoul (s, NULL, 16);
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} else {
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addr = &vfd_test_logo_bitmap[0];
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}
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break;
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case VFD_REMOTE_LOGO_BMPNR:
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if ((s = getenv ("bitmap1")) != NULL) {
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addr = (uchar *)simple_strtoul (s, NULL, 16);
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} else {
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addr = &vfd_remote_logo_bitmap[0];
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}
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break;
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default:
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printf("Unknown bitmap %ld\n", bitmap);
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return 1;
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}
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transfer_pic(3, addr, VFD_LOGO_HEIGHT, VFD_LOGO_WIDTH);
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return 0;
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}
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