mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +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>
152 lines
3.1 KiB
C
152 lines
3.1 KiB
C
/*
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* (C) Copyright 2008
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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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*/
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/*
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* UBIFS command support
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*/
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#undef DEBUG
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#include <common.h>
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#include <config.h>
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#include <command.h>
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static int ubifs_initialized;
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static int ubifs_mounted;
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/* Prototypes */
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int ubifs_init(void);
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int ubifs_mount(char *vol_name);
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int ubifs_ls(char *dir_name);
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int ubifs_load(char *filename, u32 addr, u32 size);
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int do_ubifs_mount(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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char *vol_name;
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int ret;
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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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vol_name = argv[1];
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debug("Using volume %s\n", vol_name);
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if (ubifs_initialized == 0) {
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ubifs_init();
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ubifs_initialized = 1;
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}
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ret = ubifs_mount(vol_name);
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if (ret)
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return -1;
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ubifs_mounted = 1;
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return 0;
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}
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int do_ubifs_ls(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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char *filename = "/";
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int ret;
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if (!ubifs_mounted) {
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printf("UBIFS not mounted, use ubifs mount to mount volume first!\n");
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return -1;
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}
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if (argc == 2)
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filename = argv[1];
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debug("Using filename %s\n", filename);
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ret = ubifs_ls(filename);
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if (ret)
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printf("%s not found!\n", filename);
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return ret;
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}
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int do_ubifs_load(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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char *filename;
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char *endp;
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int ret;
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u32 addr;
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u32 size = 0;
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if (!ubifs_mounted) {
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printf("UBIFS not mounted, use ubifs mount to mount volume first!\n");
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return -1;
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}
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if (argc < 3) {
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cmd_usage(cmdtp);
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return -1;
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}
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addr = simple_strtoul(argv[1], &endp, 16);
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if (endp == argv[1]) {
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cmd_usage(cmdtp);
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return 1;
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}
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filename = argv[2];
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if (argc == 4) {
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size = simple_strtoul(argv[3], &endp, 16);
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if (endp == argv[3]) {
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cmd_usage(cmdtp);
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return 1;
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}
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}
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debug("Loading file '%s' to address 0x%08x (size %d)\n", filename, addr, size);
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ret = ubifs_load(filename, addr, size);
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if (ret)
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printf("%s not found!\n", filename);
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return ret;
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}
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U_BOOT_CMD(
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ubifsmount, 2, 0, do_ubifs_mount,
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"mount UBIFS volume",
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"<volume-name>\n"
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" - mount 'volume-name' volume"
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);
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U_BOOT_CMD(ubifsls, 2, 0, do_ubifs_ls,
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"list files in a directory",
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"[directory]\n"
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" - list files in a 'directory' (default '/')"
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);
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U_BOOT_CMD(ubifsload, 4, 0, do_ubifs_load,
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"load file from an UBIFS filesystem",
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"<addr> <filename> [bytes]\n"
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" - load file 'filename' to address 'addr'"
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);
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