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authorWolfgang Denk <wd@denx.de>2010-06-28 22:00:46 +0200
committerWolfgang Denk <wd@denx.de>2010-07-04 23:55:42 +0200
commit54841ab50c20d6fa6c9cc3eb826989da3a22d934 (patch)
tree400f22f0a12ff0ae6c472bed6ac648befc1744a2 /board/amcc/taishan
parentb218ccb5435e64ac2318bb8b6c9594ef1cc724cd (diff)
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Make sure that argv[] argument pointers are not modified.
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>
Diffstat (limited to 'board/amcc/taishan')
-rw-r--r--board/amcc/taishan/lcd.c14
-rw-r--r--board/amcc/taishan/showinfo.c6
-rw-r--r--board/amcc/taishan/update.c2
3 files changed, 11 insertions, 11 deletions
diff --git a/board/amcc/taishan/lcd.c b/board/amcc/taishan/lcd.c
index d432cc3..6a049df 100644
--- a/board/amcc/taishan/lcd.c
+++ b/board/amcc/taishan/lcd.c
@@ -152,19 +152,19 @@ int lcd_init(void)
return 0;
}
-static int do_lcd_test(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
+static int do_lcd_test(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
lcd_init();
return 0;
}
-static int do_lcd_clear(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
+static int do_lcd_clear(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
*LCD_CMD_ADDR = 0x01;
mdelay(LCD_DELAY_NORMAL_MS);
return 0;
}
-static int do_lcd_puts(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
+static int do_lcd_puts(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
if (argc < 2) {
cmd_usage(cmdtp);
@@ -173,7 +173,7 @@ static int do_lcd_puts(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
lcd_puts(argv[1]);
return 0;
}
-static int do_lcd_putc(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
+static int do_lcd_putc(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
if (argc < 2) {
cmd_usage(cmdtp);
@@ -182,7 +182,7 @@ static int do_lcd_putc(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
lcd_putc((char)argv[1][0]);
return 0;
}
-static int do_lcd_cur(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
+static int do_lcd_cur(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
ulong count;
ulong dir;
@@ -356,7 +356,7 @@ void set_phy_normal_mode(void)
}
#endif /* 0 - test only */
-static int do_led_test_off(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
+static int do_led_test_off(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
volatile unsigned int *GpioOr =
(volatile unsigned int *)(CONFIG_SYS_PERIPHERAL_BASE + 0x700);
@@ -364,7 +364,7 @@ static int do_led_test_off(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
return 0;
}
-static int do_led_test_on(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
+static int do_led_test_on(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
volatile unsigned int *GpioOr =
(volatile unsigned int *)(CONFIG_SYS_PERIPHERAL_BASE + 0x700);
diff --git a/board/amcc/taishan/showinfo.c b/board/amcc/taishan/showinfo.c
index a9a80e5..587fe74 100644
--- a/board/amcc/taishan/showinfo.c
+++ b/board/amcc/taishan/showinfo.c
@@ -161,7 +161,7 @@ void show_xbridge_info(void)
printf("PCIL0_XSTS = %#010lx\n", in32r(PCIL0_STS));
}
-int do_show_xbridge_info(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
+int do_show_xbridge_info(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
show_xbridge_info();
return 0;
@@ -215,7 +215,7 @@ void show_pcix_device_info(void)
}
int do_show_pcix_device_info(cmd_tbl_t * cmdtp, int flag, int argc,
- char *argv[])
+ char * const argv[])
{
show_pcix_device_info();
return 0;
@@ -226,7 +226,7 @@ U_BOOT_CMD(xdevinfo, 1, 1, do_show_pcix_device_info,
extern void show_reset_reg(void);
-int do_show_reset_reg_info(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
+int do_show_reset_reg_info(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
show_reset_reg();
return 0;
diff --git a/board/amcc/taishan/update.c b/board/amcc/taishan/update.c
index aab3a65..3f063a0 100644
--- a/board/amcc/taishan/update.c
+++ b/board/amcc/taishan/update.c
@@ -68,7 +68,7 @@ static int update_boot_eeprom(void)
return 0;
}
-int do_update_boot_eeprom(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
+int do_update_boot_eeprom(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
return update_boot_eeprom();
}