Date: Sun, 8 Apr 2018 17:18:51 +0000 (UTC) From: Brooks Davis <brooks@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r332294 - stable/11/sys/net Message-ID: <201804081718.w38HIpL5019630@repo.freebsd.org>
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Author: brooks Date: Sun Apr 8 17:18:51 2018 New Revision: 332294 URL: https://svnweb.freebsd.org/changeset/base/332294 Log: MFC r332087: 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 Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D14912 Modified: stable/11/sys/net/if.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/net/if.c ============================================================================== --- stable/11/sys/net/if.c Sun Apr 8 17:10:32 2018 (r332293) +++ stable/11/sys/net/if.c Sun Apr 8 17:18:51 2018 (r332294) @@ -3123,10 +3123,10 @@ 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)) { @@ -3169,7 +3169,6 @@ 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);
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