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now do bounds checking in fill() and append()

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This commit is contained in:
Todd C. Miller
1995-09-01 04:24:52 +00:00
parent 57e17e71d1
commit 023afc59e3
1 changed files with 26 additions and 4 deletions
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30
parse.lex
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@@ -30,9 +30,13 @@ static char rcsid[] = "$Id$";
#endif /* lint */
#include "config.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#ifdef HAVE_STRING_H
#include <string.h>
#endif /* HAVE_STRING_H */
#include <ctype.h>
#include <sys/types.h>
#include <sys/param.h>
@@ -46,6 +50,7 @@ static char rcsid[] = "$Id$";
extern YYSTYPE yylval;
extern int clearaliases;
int sudolineno = 1;
static int string_len = 0;
static void fill __P((void));
static void append __P((void));
@@ -165,7 +170,7 @@ N [0-9][0-9]?[0-9]?
return USERALIAS;
}
l = strlen(yytext) - 1;
l = yyleng - 1;
if (isalpha(yytext[l]) || isdigit(yytext[l])) {
/* NAME is what RFC1034 calls a label */
LEXTRACE("NAME ");
@@ -179,12 +184,29 @@ N [0-9][0-9]?[0-9]?
%%
static void fill() {
(void) strcpy(yylval.string, yytext);
if (yyleng > MAXCOMMANDLENGTH) {
yyerror("command too long, recompile with a larger MAXCOMMANDLENGTH");
} else {
(void) strcpy(yylval.string, yytext);
string_len = yyleng;
}
}
static void append() {
(void) strcat(yylval.string, " ");
(void) strcat(yylval.string, yytext);
char *s;
/*
* Make sure we have enough space...
*/
s = yylval.string + string_len;
string_len += yyleng + 1;
if (string_len > MAXCOMMANDLENGTH) {
yyerror("command too long, recompile with a larger MAXCOMMANDLENGTH");
} else {
*s++ = ' ';
(void) strcpy(s, yytext);
}
}
int yywrap()