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arpwatch.15848
arpwatch-2.1a11-hname-overflow.dif
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File arpwatch-2.1a11-hname-overflow.dif of Package arpwatch.15848
--- arpwatch-2.1a11/db.c +++ arpwatch-2.1a11/db.c @@ -62,7 +62,11 @@ /* Ethernet info */ struct einfo { u_char e[6]; /* ether address */ - char h[34]; /* simple hostname */ + /* DNS name components can be up to 63 octets, and + * that's not counting non-alphanumerics that may + * get expanded to \nnn. --okir + */ + char h[64]; /* simple hostname */ time_t t; /* timestamp */ }; @@ -283,8 +287,10 @@ BCOPY(e, ep->e, 6); if (h == NULL && !initializing) h = getsname(a); - if (h != NULL && !isdigit((int)*h)) - strcpy(ep->h, h); + if (h != NULL && !isdigit((int)*h)) { + memset(ep->h, 0, sizeof(ep->h)); + strncpy(ep->h, h, sizeof(ep->h)-1); + } ep->t = t; return (ep); } @@ -304,7 +310,8 @@ if (!isdigit((int)*h) && strcmp(h, ep->h) != 0) { syslog(LOG_INFO, "hostname changed %s %s %s -> %s", intoa(ap->a), e2str(ep->e), ep->h, h); - strcpy(ep->h, h); + memset(ep->h, 0, sizeof(ep->h)); + strncpy(ep->h, h, sizeof(ep->h)-1); } }
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