diff options
author | Wolfgang Denk <wd@denx.de> | 2010-06-28 20:00:46 (GMT) |
---|---|---|
committer | Wolfgang Denk <wd@denx.de> | 2010-07-04 21:55:42 (GMT) |
commit | 54841ab50c20d6fa6c9cc3eb826989da3a22d934 (patch) | |
tree | 400f22f0a12ff0ae6c472bed6ac648befc1744a2 /common/cmd_immap.c | |
parent | b218ccb5435e64ac2318bb8b6c9594ef1cc724cd (diff) | |
download | u-boot-fsl-qoriq-54841ab50c20d6fa6c9cc3eb826989da3a22d934.tar.xz |
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 'common/cmd_immap.c')
-rw-r--r-- | common/cmd_immap.c | 36 |
1 files changed, 18 insertions, 18 deletions
diff --git a/common/cmd_immap.c b/common/cmd_immap.c index 37e6058..1f59c1e 100644 --- a/common/cmd_immap.c +++ b/common/cmd_immap.c @@ -43,14 +43,14 @@ DECLARE_GLOBAL_DATA_PTR; static void -unimplemented ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +unimplemented ( cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { printf ("Sorry, but the '%s' command has not been implemented\n", cmdtp->name); } int -do_siuinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +do_siuinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; @@ -81,7 +81,7 @@ do_siuinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) } int -do_memcinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +do_memcinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; @@ -133,7 +133,7 @@ do_memcinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) } int -do_sitinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +do_sitinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { unimplemented (cmdtp, flag, argc, argv); return 0; @@ -141,7 +141,7 @@ do_sitinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) #ifdef CONFIG_8260 int -do_icinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +do_icinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { unimplemented (cmdtp, flag, argc, argv); return 0; @@ -149,7 +149,7 @@ do_icinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) #endif int -do_carinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +do_carinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; @@ -233,7 +233,7 @@ static void binary (char *label, uint value, int nbits) #endif int -do_iopinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +do_iopinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; @@ -316,7 +316,7 @@ do_iopinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) * use *uint and set the address based on cmd + port */ int -do_iopset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +do_iopset (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { uint rcode = 0; iopin_t iopin; @@ -431,14 +431,14 @@ do_iopset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) } int -do_dmainfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +do_dmainfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { unimplemented (cmdtp, flag, argc, argv); return 0; } int -do_fccinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +do_fccinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { unimplemented (cmdtp, flag, argc, argv); return 0; @@ -498,7 +498,7 @@ static void prbrg (int n, uint val) } int -do_brginfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +do_brginfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; @@ -522,7 +522,7 @@ do_brginfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) } int -do_i2cinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +do_i2cinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; @@ -569,42 +569,42 @@ do_i2cinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) } int -do_sccinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +do_sccinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { unimplemented (cmdtp, flag, argc, argv); return 0; } int -do_smcinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +do_smcinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { unimplemented (cmdtp, flag, argc, argv); return 0; } int -do_spiinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +do_spiinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { unimplemented (cmdtp, flag, argc, argv); return 0; } int -do_muxinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +do_muxinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { unimplemented (cmdtp, flag, argc, argv); return 0; } int -do_siinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +do_siinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { unimplemented (cmdtp, flag, argc, argv); return 0; } int -do_mccinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +do_mccinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { unimplemented (cmdtp, flag, argc, argv); return 0; |