Date: Fri, 4 Aug 2000 14:10:03 -0700 (PDT) From: Kris Kennaway <kris@hub.freebsd.org> To: Warner Losh <imp@village.org> Cc: audit@FreeBSD.ORG Subject: Re: ether_line() patch Message-ID: <Pine.BSF.4.21.0008041408420.64303-100000@hub.freebsd.org> In-Reply-To: <Pine.BSF.4.21.0008041355250.64303-100000@hub.freebsd.org>
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On Fri, 4 Aug 2000, Kris Kennaway wrote: > strncpy does not null-terminate if strlen(result) == resultlen. In that > case the buf[resultlen] character will be stomped by the NULL - it's a > trivial change, but I think it's correct. Actually we were both wrong - this strncpy was just bogus and did no bounds checking. This patch hunk should be better. @@ -156,8 +178,8 @@ strlen(ether_a), &result, &resultlen)) { continue; } - strncpy(buf, result, resultlen); - buf[resultlen] = '\0'; + strncpy(buf, result, sizeof(buf) - 1); + buf[sizeof(buf)] = '\0'; free(result); } #endif Kris -- In God we Trust -- all others must submit an X.509 certificate. -- Charles Forsythe <forsythe@alum.mit.edu> To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-audit" in the body of the message
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