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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/amirix
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/amirix')
-rw-r--r--board/amirix/ap1000/ap1000.c10
-rw-r--r--board/amirix/ap1000/powerspan.c4
2 files changed, 7 insertions, 7 deletions
diff --git a/board/amirix/ap1000/ap1000.c b/board/amirix/ap1000/ap1000.c
index cadfe0b..c8dd99e 100644
--- a/board/amirix/ap1000/ap1000.c
+++ b/board/amirix/ap1000/ap1000.c
@@ -167,7 +167,7 @@ unsigned int get_device (void)
/*
This function loads FPGA configurations from the SystemACE CompactFlash
*/
-int do_loadace (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
+int do_loadace (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
unsigned char *p = (unsigned char *) AP1000_SYSACE_REGBASE;
int cfg;
@@ -247,7 +247,7 @@ int do_loadace (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
* -1 if failed
* </pre>
*/
-int do_swconfigbyte (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
+int do_swconfigbyte (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
unsigned char *sector_buffer = NULL;
unsigned char input_char;
@@ -311,7 +311,7 @@ int do_swconfigbyte (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
#define ONE_SECOND 1000000
-int do_pause (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
+int do_pause (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
int pause_time;
unsigned int delay_time;
@@ -345,7 +345,7 @@ int do_pause (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
return 0;
}
-int do_swreconfig (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
+int do_swreconfig (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
printf ("Triggering software reconfigure (software config byte is 0x%02x)...\n",
*((unsigned char *) (SW_BYTE_SECTOR_ADDR + SW_BYTE_SECTOR_OFFSET)));
@@ -365,7 +365,7 @@ int do_swreconfig (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
#define TEMP_ETHERM_BIT 0x02
#define TEMP_LTHERM_BIT 0x01
-int do_temp_sensor (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
+int do_temp_sensor (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
char cmd;
int ret_val = 0;
diff --git a/board/amirix/ap1000/powerspan.c b/board/amirix/ap1000/powerspan.c
index 28e2bbc..55451b1 100644
--- a/board/amirix/ap1000/powerspan.c
+++ b/board/amirix/ap1000/powerspan.c
@@ -364,7 +364,7 @@ int EEPROMWrite (unsigned char theI2CAddress, unsigned char theValue)
&theValue, I2C_WRITE);
}
-int do_eeprom (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
+int do_eeprom (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
char cmd;
int ret_val = 0;
@@ -690,7 +690,7 @@ int SetTargetImage (int theImageIndex, unsigned int theBlockSize,
return 0;
}
-int do_bridge (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
+int do_bridge (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
char cmd;
int ret_val = 1;