Date: Wed, 24 Nov 1999 00:52:08 -0700 From: Warner Losh <imp@village.org> To: Kris Kennaway <kris@hub.freebsd.org> Cc: current@FreeBSD.ORG Subject: Re: Overflow in banner(1) Message-ID: <199911240752.AAA18930@harmony.village.org> In-Reply-To: Your message of "Tue, 23 Nov 1999 21:15:35 PST." <Pine.BSF.4.21.9911232111470.75155-100000@hub.freebsd.org> References: <Pine.BSF.4.21.9911232111470.75155-100000@hub.freebsd.org>
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In message <Pine.BSF.4.21.9911232111470.75155-100000@hub.freebsd.org> Kris Kennaway writes: : I'll commit this tomorrow (just wanted to get in a 'first post!' :-).. Please don't. Please use a proper fix instead. : /* Have now read in the data. Next get the message to be printed. */ : if (*argv) { : - strcpy(message, *argv); : + strncpy(message, *argv, MAXMSG); : while (*++argv) { : - strcat(message, " "); : - strcat(message, *argv); : + strlcat(message, " ", MAXMSG); : + strlcat(message, *argv, MAXMSG); Can you precompute the length, malloc the buffer and go from there? wouldn't that be better? : } : nchars = strlen(message); : } else { : fprintf(stderr,"Message: "); : - (void)fgets(message, sizeof(message), stdin); : + (void)fgets(message, MAXMSG, stdin); This is bad style. Don't make this change. : nchars = strlen(message); : message[nchars--] = '\0'; /* get rid of newline */ : } Warner To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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