mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-05 02:36:39 +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>
77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
/*
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* (C) Copyright 2008
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* Jean-Christophe PLAGNIOL-VILLARD <jcplagniol@jcrosoft.com>
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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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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, MA 02111-1307 USA
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*
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*/
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#include <common.h>
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#include <command.h>
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#include <image.h>
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#include <asm/byteorder.h>
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#include <asm/addrspace.h>
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DECLARE_GLOBAL_DATA_PTR;
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int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
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{
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void (*theKernel) (int, char **, char **, int *);
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char *bootargs = getenv ("bootargs");
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char *start;
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uint len;
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/* find kernel entry point */
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theKernel = (void (*)(int, char **, char **, int *))images->ep;
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show_boot_progress (15);
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debug ("## Transferring control to Linux (at address %08lx) ...\n",
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(ulong) theKernel);
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gd->bd->bi_boot_params = gd->bd->bi_memstart + (16 << 20) - 256;
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debug ("%-12s= 0x%08lX\n", "boot_params", (ulong)gd->bd->bi_boot_params);
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/* set Magic */
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*(int32_t *)(gd->bd->bi_boot_params - 4) = 0x12345678;
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/* set ram_size */
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*(int32_t *)(gd->bd->bi_boot_params - 8) = gd->ram_size;
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start = (char*)gd->bd->bi_boot_params;
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len = strlen(bootargs);
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strncpy(start, bootargs, len + 1);
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start += len;
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len = images->rd_end - images->rd_start;
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if (len > 0) {
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start += sprintf(start," rd_start=0x%08X rd_size=0x%0X",
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(uint) UNCACHED_SDRAM (images->rd_start),
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(uint) len);
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}
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/* we assume that the kernel is in place */
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printf ("\nStarting kernel ...\n\n");
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theKernel (0, NULL, NULL, 0);
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/* does not return */
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return 1;
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}
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