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Elsukov" Date: Fri, 7 Dec 2018 09:39:38 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r341678 - stable/11/sys/net X-SVN-Group: stable-11 X-SVN-Commit-Author: ae X-SVN-Commit-Paths: stable/11/sys/net X-SVN-Commit-Revision: 341678 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: AC5F28107F X-Spamd-Result: default: False [-2.03 / 15.00]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_HAM_MEDIUM(-0.99)[-0.989,0]; NEURAL_HAM_SHORT(-0.97)[-0.971,0]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US]; NEURAL_HAM_LONG(-0.07)[-0.070,0] X-Rspamd-Server: mx1.freebsd.org X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 07 Dec 2018 09:39:39 -0000 Author: ae Date: Fri Dec 7 09:39:37 2018 New Revision: 341678 URL: https://svnweb.freebsd.org/changeset/base/341678 Log: MFC r341008: Fix possible panic during ifnet detach in rtsock. The panic can happen, when some application does dump of routing table using sysctl interface. To prevent this, set IFF_DYING flag in if_detach_internal() function, when ifnet under lock is removed from the chain. In sysctl_rtsock() take IFNET_RLOCK_NOSLEEP() to prevent ifnet detach during routes enumeration. In case, if some interface was detached in the time before we take the lock, add the check, that ifnet is not DYING. This prevents access to memory that could be freed after ifnet is unlinked. Differential Revision: https://reviews.freebsd.org/D18338 Modified: stable/11/sys/net/if.c stable/11/sys/net/rtsock.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/net/if.c ============================================================================== --- stable/11/sys/net/if.c Fri Dec 7 09:38:25 2018 (r341677) +++ stable/11/sys/net/if.c Fri Dec 7 09:39:37 2018 (r341678) @@ -1031,6 +1031,8 @@ if_detach_internal(struct ifnet *ifp, int vmove, struc TAILQ_FOREACH(iter, &V_ifnet, if_link) if (iter == ifp) { TAILQ_REMOVE(&V_ifnet, ifp, if_link); + if (!vmove) + ifp->if_flags |= IFF_DYING; found = 1; break; } Modified: stable/11/sys/net/rtsock.c ============================================================================== --- stable/11/sys/net/rtsock.c Fri Dec 7 09:38:25 2018 (r341677) +++ stable/11/sys/net/rtsock.c Fri Dec 7 09:39:37 2018 (r341678) @@ -1548,6 +1548,8 @@ sysctl_dumpentry(struct radix_node *rn, void *vw) struct rt_addrinfo info; struct sockaddr_storage ss; + IFNET_RLOCK_NOSLEEP_ASSERT(); + if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg)) return 0; if ((rt->rt_flags & RTF_HOST) == 0 @@ -1560,7 +1562,7 @@ sysctl_dumpentry(struct radix_node *rn, void *vw) info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(rt_key(rt), rt_mask(rt), &ss); info.rti_info[RTAX_GENMASK] = 0; - if (rt->rt_ifp) { + if (rt->rt_ifp && !(rt->rt_ifp->if_flags & IFF_DYING)) { info.rti_info[RTAX_IFP] = rt->rt_ifp->if_addr->ifa_addr; info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr; if (rt->rt_ifp->if_flags & IFF_POINTOPOINT) @@ -1925,8 +1927,10 @@ sysctl_rtsock(SYSCTL_HANDLER_ARGS) rnh = rt_tables_get_rnh(fib, i); if (rnh != NULL) { RIB_RLOCK(rnh); + IFNET_RLOCK_NOSLEEP(); error = rnh->rnh_walktree(&rnh->head, sysctl_dumpentry, &w); + IFNET_RUNLOCK_NOSLEEP(); RIB_RUNLOCK(rnh); } else if (af != 0) error = EAFNOSUPPORT;