Author: brooks Date: Thu Apr 5 21:58:28 2018 New Revision: 332087 URL: https://svnweb.freebsd.org/changeset/base/332087
Log: ifconf(): Always zero the whole struct ifreq. The previous split of zeroing ifr_name and ifr_addr seperately is safe on current architectures, but would be unsafe if pointers were larger than 8 bytes. Combining the zeroing adds no real cost (a few instructions) and makes the security property easier to verify. Reviewed by: kib, emaste Obtained from: CheriBSD MFC after: 3 days Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D14912 Modified: head/sys/net/if.c Modified: head/sys/net/if.c ============================================================================== --- head/sys/net/if.c Thu Apr 5 20:31:45 2018 (r332086) +++ head/sys/net/if.c Thu Apr 5 21:58:28 2018 (r332087) @@ -3129,10 +3129,10 @@ again: int addrs; /* - * Zero the ifr_name buffer to make sure we don't - * disclose the contents of the stack. + * Zero the ifr to make sure we don't disclose the contents + * of the stack. */ - memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); + memset(&ifr, 0, sizeof(ifr)); if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) >= sizeof(ifr.ifr_name)) { @@ -3166,7 +3166,6 @@ again: } IF_ADDR_RUNLOCK(ifp); if (addrs == 0) { - bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); sbuf_bcat(sb, &ifr, sizeof(ifr)); max_len += sizeof(ifr); _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
