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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 /include
parentb218ccb5435e64ac2318bb8b6c9594ef1cc724cd (diff)
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 'include')
-rw-r--r--include/bedbug/type.h2
-rw-r--r--include/command.h8
-rw-r--r--include/common.h2
-rw-r--r--include/exports.h2
-rw-r--r--include/image.h4
-rw-r--r--include/kgdb.h2
-rw-r--r--include/vxworks.h2
7 files changed, 11 insertions, 11 deletions
diff --git a/include/bedbug/type.h b/include/bedbug/type.h
index 38ee9ded73..b7b447b1fe 100644
--- a/include/bedbug/type.h
+++ b/include/bedbug/type.h
@@ -15,7 +15,7 @@ typedef struct {
int current_bp;
struct pt_regs *regs;
- void (*do_break) (cmd_tbl_t *, int, int, char *[]);
+ void (*do_break) (cmd_tbl_t *, int, int, char * const []);
void (*break_isr) (struct pt_regs *);
int (*find_empty) (void);
int (*set) (int, unsigned long);
diff --git a/include/command.h b/include/command.h
index 55caa6eaf8..9144d69206 100644
--- a/include/command.h
+++ b/include/command.h
@@ -48,14 +48,14 @@ struct cmd_tbl_s {
int maxargs; /* maximum number of arguments */
int repeatable; /* autorepeat allowed? */
/* Implementation function */
- int (*cmd)(struct cmd_tbl_s *, int, int, char *[]);
+ int (*cmd)(struct cmd_tbl_s *, int, int, char * const []);
char *usage; /* Usage message (short) */
#ifdef CONFIG_SYS_LONGHELP
char *help; /* Help message (long) */
#endif
#ifdef CONFIG_AUTO_COMPLETE
/* do auto completion on the arguments */
- int (*complete)(int argc, char *argv[], char last_char, int maxv, char *cmdv[]);
+ int (*complete)(int argc, char * const argv[], char last_char, int maxv, char *cmdv[]);
#endif
};
@@ -67,7 +67,7 @@ extern cmd_tbl_t __u_boot_cmd_end;
/* common/command.c */
int _do_help (cmd_tbl_t *cmd_start, int cmd_items, cmd_tbl_t * cmdtp, int
- flag, int argc, char *argv[]);
+ flag, int argc, char * const argv[]);
cmd_tbl_t *find_cmd(const char *cmd);
cmd_tbl_t *find_cmd_tbl (const char *cmd, cmd_tbl_t *table, int table_len);
@@ -83,7 +83,7 @@ extern int cmd_auto_complete(const char *const prompt, char *buf, int *np, int *
*
* All commands use a common argument format:
*
- * void function (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
+ * void function (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
*/
typedef void command_t (cmd_tbl_t *, int, int, char *[]);
diff --git a/include/common.h b/include/common.h
index 48f6a1a074..eddec22752 100644
--- a/include/common.h
+++ b/include/common.h
@@ -718,7 +718,7 @@ void show_boot_progress(int val);
int cpu_status(int nr);
int cpu_reset(int nr);
int cpu_disable(int nr);
-int cpu_release(int nr, int argc, char *argv[]);
+int cpu_release(int nr, int argc, char * const argv[]);
#endif
#endif /* __ASSEMBLY__ */
diff --git a/include/exports.h b/include/exports.h
index 9588bc94e4..1d79a3162c 100644
--- a/include/exports.h
+++ b/include/exports.h
@@ -35,7 +35,7 @@ int i2c_read (uchar, uint, int , uchar* , int);
#endif
#include <spi.h>
-void app_startup(char **);
+void app_startup(char * const *);
#endif /* ifndef __ASSEMBLY__ */
diff --git a/include/image.h b/include/image.h
index 366b622ccf..bcc08d1a73 100644
--- a/include/image.h
+++ b/include/image.h
@@ -328,12 +328,12 @@ int genimg_get_format (void *img_addr);
int genimg_has_config (bootm_headers_t *images);
ulong genimg_get_image (ulong img_addr);
-int boot_get_ramdisk (int argc, char *argv[], bootm_headers_t *images,
+int boot_get_ramdisk (int argc, char * const argv[], bootm_headers_t *images,
uint8_t arch, ulong *rd_start, ulong *rd_end);
#ifdef CONFIG_OF_LIBFDT
-int boot_get_fdt (int flag, int argc, char *argv[], bootm_headers_t *images,
+int boot_get_fdt (int flag, int argc, char * const argv[], bootm_headers_t *images,
char **of_flat_tree, ulong *of_size);
int boot_relocate_fdt (struct lmb *lmb, ulong bootmap_base,
char **of_flat_tree, ulong *of_size);
diff --git a/include/kgdb.h b/include/kgdb.h
index f543cd6e18..b6ba742ad3 100644
--- a/include/kgdb.h
+++ b/include/kgdb.h
@@ -55,7 +55,7 @@ extern int kgdb_getregs(struct pt_regs *, char *, int);
extern void kgdb_putreg(struct pt_regs *, int, char *, int);
extern void kgdb_putregs(struct pt_regs *, char *, int);
extern int kgdb_trap(struct pt_regs *);
-extern void kgdb_breakpoint(int argc, char *argv[]);
+extern void kgdb_breakpoint(int argc, char * const argv[]);
/* these functions are provided by the platform serial driver */
extern void kgdb_serial_init(void);
diff --git a/include/vxworks.h b/include/vxworks.h
index 1633904bd8..917a9ff856 100644
--- a/include/vxworks.h
+++ b/include/vxworks.h
@@ -24,7 +24,7 @@
#ifndef _VXWORKS_H_
#define _VXWORKS_H_
-int do_bootvx(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
+int do_bootvx(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
/*
* Use bootaddr to find the location in memory that VxWorks