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RS: fix bug that overflows r_argv[]

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. reported and debugged by Arne Welzel
	. problem is if there are too many args
	. there is a check, but then unconditional NULL termination
This commit is contained in:
Ben Gras 2011-07-20 17:36:21 +02:00
parent 000a9d36be
commit 3dd7649ae7
2 changed files with 9 additions and 2 deletions
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8
servers/rs/manager.c
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@ -181,11 +181,17 @@ PUBLIC void build_cmd_dep(struct rproc *rp)
*cmd_ptr = '\0'; /* terminate previous */
while (*++cmd_ptr == ' ') ; /* skip spaces */
if (*cmd_ptr == '\0') break; /* no arg following */
if (arg_count>MAX_NR_ARGS+1) break; /* arg vector full */
/* There are ARGV_ELEMENTS elements; must leave one for null */
if (arg_count>=ARGV_ELEMENTS-1) { /* arg vector full */
printf("RS: build_cmd_dep: too many args\n");
break;
}
assert(arg_count < ARGV_ELEMENTS);
rp->r_argv[arg_count++] = cmd_ptr; /* add to arg vector */
}
cmd_ptr ++; /* continue parsing */
}
assert(arg_count < ARGV_ELEMENTS);
rp->r_argv[arg_count] = NULL; /* end with NULL pointer */
rp->r_argc = arg_count;

3
servers/rs/type.h
View file

@ -50,7 +50,8 @@ struct rproc {
char r_cmd[MAX_COMMAND_LEN]; /* raw command plus arguments */
char r_args[MAX_COMMAND_LEN]; /* null-separated raw command plus arguments */
char *r_argv[MAX_NR_ARGS+2]; /* parsed arguments vector */
#define ARGV_ELEMENTS (MAX_NR_ARGS+2) /* path, args, null */
char *r_argv[ARGV_ELEMENTS];
int r_argc; /* number of arguments */
char r_script[MAX_SCRIPT_LEN]; /* name of the restart script executable */