- 14 Apr, 2014 33 commits
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David Stevens authored
[ Upstream commit 4b29dba9 ] The VXLAN neigh_reduce() code is completely non-functional since check-in. Specific errors: 1) The original code drops all packets with a multicast destination address, even though neighbor solicitations are sent to the solicited-node address, a multicast address. The code after this check was never run. 2) The neighbor table lookup used the IPv6 header destination, which is the solicited node address, rather than the target address from the neighbor solicitation. So neighbor lookups would always fail if it got this far. Also for L3MISSes. 3) The code calls ndisc_send_na(), which does a send on the tunnel device. The context for neigh_reduce() is the transmit path, vxlan_xmit(), where the host or a bridge-attached neighbor is trying to transmit a neighbor solicitation. To respond to it, the tunnel endpoint needs to do a *receive* of the appropriate neighbor advertisement. Doing a send, would only try to send the advertisement, encapsulated, to the remote destinations in the fdb -- hosts that definitely did not do the corresponding solicitation. 4) The code uses the tunnel endpoint IPv6 forwarding flag to determine the isrouter flag in the advertisement. This has nothing to do with whether or not the target is a router, and generally won't be set since the tunnel endpoint is bridging, not routing, traffic. The patch below creates a proxy neighbor advertisement to respond to neighbor solicitions as intended, providing proper IPv6 support for neighbor reduction. Signed-off-by:
David L Stevens <dlstevens@us.ibm.com> Signed-off-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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David Stevens authored
[ Upstream commit 7346135d ] This patch fixes a NULL pointer dereference in the event of an skb allocation failure in arp_reduce(). Signed-Off-By:
Cong Wang <cwang@twopensource.com> Signed-off-by:
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Bjørn Mork authored
[ Upstream commit ff0992e9 ] This is a context modified revert of commit 6a9612e2 ("net: cdc_ncm: remove ncm_parm field") which introduced a NCM specification violation, causing setup errors for some devices. These errors resulted in the device and host disagreeing about shared settings, with complete failure to communicate as the end result. The NCM specification require that many of the NCM specific control reuests are sent only while the NCM Data Interface is in alternate setting 0. Reverting the commit ensures that we follow this requirement. Fixes: 6a9612e2 ("net: cdc_ncm: remove ncm_parm field") Reported-and-tested-by:
Pasi Kärkkäinen <pasik@iki.fi> Reported-by:
Thomas Schäfer <tschaefer@t-online.de> Signed-off-by:
Bjørn Mork <bjorn@mork.no> Signed-off-by:
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lucien authored
[ Upstream commit e367c2d0 ] In ip6_append_data_mtu(), when the xfrm mode is not tunnel(such as transport),the ipsec header need to be added in the first fragment, so the mtu will decrease to reserve space for it, then the second fragment come, the mtu should be turn back, as the commit 0c183379 said. however, in the commit a493e60ac4bbe2e977e7129d6d8cbb0dd236be, it use *mtu = min(*mtu, ...) to change the mtu, which lead to the new mtu is alway equal with the first fragment's. and cannot turn back. when I test through ping6 -c1 -s5000 $ip (mtu=1280): ...frag (0|1232) ESP(spi=0x00002000,seq=0xb), length 1232 ...frag (1232|1216) ...frag (2448|1216) ...frag (3664|1216) ...frag (4880|164) which should be: ...frag (0|1232) ESP(spi=0x00001000,seq=0x1), length 1232 ...frag (1232|1232) ...frag (2464|1232) ...frag (3696|1232) ...frag (4928|116) so delete the min() when change back the mtu. Signed-off-by:
Xin Long <lucien.xin@gmail.com> Fixes: 75a493e6 ("ipv6: ip6_append_data_mtu did not care about pmtudisc and frag_size") Acked-by:
Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by:
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Heiner Kallweit authored
[ Upstream commit ecab6701 ] tmp_prefered_lft is an offset to ifp->tstamp, not now. Therefore age needs to be added to the condition. Age calculation in ipv6_create_tempaddr is different from the one in addrconf_verify and doesn't consider ADDRCONF_TIMER_FUZZ_MINUS. This can cause age in ipv6_create_tempaddr to be less than the one in addrconf_verify and therefore unnecessary temporary address to be generated. Use age calculation as in addrconf_modify to avoid this. Signed-off-by:
Heiner Kallweit <heiner.kallweit@web.de> Signed-off-by:
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Stefan Wahren authored
[ Upstream commit 84fe6182 ] If the Freescale fec is in promiscuous mode and network cable is reconnected then the promiscuous mode get lost. The problem is caused by a too soon call of set_multicast_list to re-enable promisc mode. The FEC_R_CNTRL register changes are overwritten by fec_restart. This patch fixes this by moving the call behind the init of FEC_R_CNTRL register in fec_restart. Successful tested on a i.MX28 board. Signed-off-by:
Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by:
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dingtianhong authored
[ Upstream commit fb00bc2e ] The commit d3ab3ffd (bonding: use rlb_client_info->vlan_id instead of ->tag) remove the rlb_client_info->tag, but occur some issues, The vlan_get_tag() will return 0 for success and -EINVAL for error, so the client_info->vlan_id always be set to 0 if the vlan_get_tag return 0 for success, so the client_info would never get a correct vlan id. We should only set the vlan id to 0 when the vlan_get_tag return error. Fixes: d3ab3ffd (bonding: use rlb_client_info->vlan_id instead of ->tag) CC: Ding Tianhong <dingtianhong@huawei.com> CC: Jay Vosburgh <fubar@us.ibm.com> CC: Andy Gospodarek <andy@greyhouse.net> Signed-off-by:
Ding Tianhong <dingtianhong@huawei.com> Acked-by:
Veaceslav Falico <vfalico@redhat.com> Signed-off-by:
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Matthew Leach authored
[ Upstream commit dbb490b9 ] When copying in a struct msghdr from the user, if the user has set the msg_namelen parameter to a negative value it gets clamped to a valid size due to a comparison between signed and unsigned values. Ensure the syscall errors when the user passes in a negative value. Signed-off-by:
Matthew Leach <matthew.leach@arm.com> Signed-off-by:
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Linus Lüssing authored
[ Upstream commit 20a599be ] Without this check someone could easily create a denial of service by injecting multicast-specific queries to enable the bridge snooping part if no real querier issuing periodic general queries is present on the link which would result in the bridge wrongly shutting down ports for multicast traffic as the bridge did not learn about these listeners. With this patch the snooping code is enabled upon receiving valid, general queries only. Signed-off-by:
Linus Lüssing <linus.luessing@web.de> Signed-off-by:
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Linus Lüssing authored
[ Upstream commit 9ed973cc ] General IGMP and MLD queries are supposed to have the multicast link-local all-nodes address as their destination according to RFC2236 section 9, RFC3376 section 4.1.12/9.1, RFC2710 section 8 and RFC3810 section 5.1.15. Without this check, such malformed IGMP/MLD queries can result in a denial of service: The queries are ignored by most IGMP/MLD listeners therefore they will not respond with an IGMP/MLD report. However, without this patch these malformed MLD queries would enable the snooping part in the bridge code, potentially shutting down the according ports towards these hosts for multicast traffic as the bridge did not learn about these listeners. Reported-by:
Jan Stancek <jstancek@redhat.com> Signed-off-by:
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Eric Dumazet authored
[ Upstream commit c3f9b018 ] Lars Persson reported following deadlock : -000 |M:0x0:0x802B6AF8(asm) <-- arch_spin_lock -001 |tcp_v4_rcv(skb = 0x8BD527A0) <-- sk = 0x8BE6B2A0 -002 |ip_local_deliver_finish(skb = 0x8BD527A0) -003 |__netif_receive_skb_core(skb = 0x8BD527A0, ?) -004 |netif_receive_skb(skb = 0x8BD527A0) -005 |elk_poll(napi = 0x8C770500, budget = 64) -006 |net_rx_action(?) -007 |__do_softirq() -008 |do_softirq() -009 |local_bh_enable() -010 |tcp_rcv_established(sk = 0x8BE6B2A0, skb = 0x87D3A9E0, th = 0x814EBE14, ?) -011 |tcp_v4_do_rcv(sk = 0x8BE6B2A0, skb = 0x87D3A9E0) -012 |tcp_delack_timer_handler(sk = 0x8BE6B2A0) -013 |tcp_release_cb(sk = 0x8BE6B2A0) -014 |release_sock(sk = 0x8BE6B2A0) -015 |tcp_sendmsg(?, sk = 0x8BE6B2A0, ?, ?) -016 |sock_sendmsg(sock = 0x8518C4C0, msg = 0x87D8DAA8, size = 4096) -017 |kernel_sendmsg(?, ?, ?, ?, size = 4096) -018 |smb_send_kvec() -019 |smb_send_rqst(server = 0x87C4D400, rqst = 0x87D8DBA0) -020 |cifs_call_async() -021 |cifs_async_writev(wdata = 0x87FD6580) -022 |cifs_writepages(mapping = 0x852096E4, wbc = 0x87D8DC88) -023 |__writeback_single_inode(inode = 0x852095D0, wbc = 0x87D8DC88) -024 |writeback_sb_inodes(sb = 0x87D6D800, wb = 0x87E4A9C0, work = 0x87D8DD88) -025 |__writeback_inodes_wb(wb = 0x87E4A9C0, work = 0x87D8DD88) -026 |wb_writeback(wb = 0x87E4A9C0, work = 0x87D8DD88) -027 |wb_do_writeback(wb = 0x87E4A9C0, force_wait = 0) -028 |bdi_writeback_workfn(work = 0x87E4A9CC) -029 |process_one_work(worker = 0x8B045880, work = 0x87E4A9CC) -030 |worker_thread(__worker = 0x8B045880) -031 |kthread(_create = 0x87CADD90) -032 |ret_from_kernel_thread(asm) Bug occurs because __tcp_checksum_complete_user() enables BH, assuming it is running from softirq context. Lars trace involved a NIC without RX checksum support but other points are problematic as well, like the prequeue stuff. Problem is triggered by a timer, that found socket being owned by user. tcp_release_cb() should call tcp_write_timer_handler() or tcp_delack_timer_handler() in the appropriate context : BH disabled and socket lock held, but 'owned' field cleared, as if they were running from timer handlers. Fixes: 6f458dfb ("tcp: improve latencies of timer triggered events") Reported-by:
Lars Persson <lars.persson@axis.com> Tested-by:
Eric Dumazet <edumazet@google.com> Signed-off-by:
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Michael S. Tsirkin authored
[ Upstream commit 1fd819ec ] skb_segment copies frags around, so we need to copy them carefully to avoid accessing user memory after reporting completion to userspace through a callback. skb_segment doesn't normally happen on datapath: TSO needs to be disabled - so disabling zero copy in this case does not look like a big deal. Signed-off-by:
Michael S. Tsirkin <mst@redhat.com> Acked-by:
Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by:
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Michael S. Tsirkin authored
[ Upstream commit 1a4cedaf ] fskb is unrelated to frag: it's coming from frag_list. Rename it list_skb to avoid confusion. Signed-off-by:
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Michael S. Tsirkin authored
[ Upstream commit df5771ff ] rename local variable to make it easier to tell at a glance that we are dealing with a head skb. Signed-off-by:
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Michael S. Tsirkin authored
[ Upstream commit 4e1beba1 ] skb_frag can in fact point at either skb or fskb so rename it generally "frag". Signed-off-by:
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Michael S. Tsirkin authored
[ Upstream commit 8cb19905 ] frag points at nskb, so name it appropriately Signed-off-by:
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Peter Boström authored
[ Upstream commit dd38743b ] With TX VLAN offload enabled the source MAC address for frames sent using the VLAN interface is currently set to the address of the real interface. This is wrong since the VLAN interface may be configured with a different address. The bug was introduced in commit 2205369a ("vlan: Fix header ops passthru when doing TX VLAN offload."). This patch sets the source address before calling the create function of the real interface. Signed-off-by:
Peter Boström <peter.bostrom@netrounds.com> Signed-off-by:
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Annie Li authored
[ Upstream commit 5bd07670 ] Current netback uses gso_type to check whether the skb contains gso offload, and this is wrong. Gso_size is the right one to check gso existence, and gso_type is only used to check gso type. Some skbs contains nonzero gso_type and zero gso_size, current netback would treat these skbs as gso and create wrong response for this. This also causes ssh failure to domu from other server. V2: use skb_is_gso function as Paul Durrant suggested Signed-off-by:
Annie Li <annie.li@oracle.com> Acked-by:
Wei Liu <wei.liu2@citrix.com> Reviewed-by:
Paul Durrant <paul.durrant@citrix.com> Signed-off-by:
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Eric Dumazet authored
[ Upstream commit 2d8d40af ] Resizing fq hash table allocates memory while holding qdisc spinlock, with BH disabled. This is definitely not good, as allocation might sleep. We can drop the lock and get it when needed, we hold RTNL so no other changes can happen at the same time. Signed-off-by:
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Michael Chan authored
[ Upstream commit a8d9bc2e ] The pci shutdown handler added in: bnx2: Add pci shutdown handler commit 25bfb1dd created a shutdown down sequence without chip reset if the device was never brought up. This can cause the firmware to shutdown the PHY prematurely and cause MMIO read cycles to be unresponsive. On some systems, it may generate NMI in the bnx2's pci shutdown handler. The fix is to tell the firmware not to shutdown the PHY if there was no prior chip reset. Signed-off-by:
Michael Chan <mchan@broadcom.com> Signed-off-by:
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Sabrina Dubroca authored
[ Upstream commit c88507fb ] DST_NOCOUNT should only be used if an authorized user adds routes locally. In case of routes which are added on behalf of router advertisments this flag must not get used as it allows an unlimited number of routes getting added remotely. Signed-off-by:
Sabrina Dubroca <sd@queasysnail.net> Acked-by:
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Anton Nayshtut authored
[ Upstream commit d2d273ff ] Without this fix, ipv6_exthdrs_offload_init doesn't register IPPROTO_DSTOPTS offload, but returns 0 (as the IPPROTO_ROUTING registration actually succeeds). This then causes the ipv6_gso_segment to drop IPv6 packets with IPPROTO_DSTOPTS header. The issue detected and the fix verified by running MS HCK Offload LSO test on top of QEMU Windows guests, as this test sends IPv6 packets with IPPROTO_DSTOPTS. Signed-off-by:
Anton Nayshtut <anton@swortex.com> Signed-off-by:
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Eric Dumazet authored
[ Upstream commit de144391 ] Some applications didn't expect recvmsg() on a non blocking socket could return -EINTR. This possibility was added as a side effect of commit b3ca9b02 ("net: fix multithreaded signal handling in unix recv routines"). To hit this bug, you need to be a bit unlucky, as the u->readlock mutex is usually held for very small periods. Fixes: b3ca9b02 ("net: fix multithreaded signal handling in unix recv routines") Signed-off-by:
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Florian Westphal authored
[ Upstream commit e588e2f2 ] Quoting Alexander Aring: While fragmentation and unloading of 6lowpan module I got this kernel Oops after few seconds: BUG: unable to handle kernel paging request at f88bbc30 [..] Modules linked in: ipv6 [last unloaded: 6lowpan] Call Trace: [<c012af4c>] ? call_timer_fn+0x54/0xb3 [<c012aef8>] ? process_timeout+0xa/0xa [<c012b66b>] run_timer_softirq+0x140/0x15f Problem is that incomplete frags are still around after unload; when their frag expire timer fires, we get crash. When a netns is removed (also done when unloading module), inet_frag calls the evictor with 'force' argument to purge remaining frags. The evictor loop terminates when accounted memory ('work') drops to 0 or the lru-list becomes empty. However, the mem accounting is done via percpu counters and may not be accurate, i.e. loop may terminate prematurely. Alter evictor to only stop once the lru list is empty when force is requested. Reported-by:
Phoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de> Reported-by:
Alexander Aring <alex.aring@gmail.com> Tested-by:
Florian Westphal <fw@strlen.de> Acked-by:
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Erik Hugne authored
[ Upstream commit 2892505e ] Failure to schedule a TIPC tasklet with tipc_k_signal because the tasklet handler is disabled is not an error. It means TIPC is currently in the process of shutting down. We remove the error logging in this case. Signed-off-by:
Erik Hugne <erik.hugne@ericsson.com> Reviewed-by:
Jon Maloy <jon.maloy@ericsson.com> Signed-off-by:
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Erik Hugne authored
[ Upstream commit 1bb8dce5 ] When the TIPC module is removed, the tasklet handler is disabled before all other subsystems. This will cause lingering publications in the name table because the node_down tasklets responsible to clean up publications from an unreachable node will never run. When the name table is shut down, these publications are detected and an error message is logged: tipc: nametbl_stop(): orphaned hash chain detected This is actually a memory leak, introduced with commit 993b858e ("tipc: correct the order of stopping services at rmmod") Instead of just logging an error and leaking memory, we free the orphaned entries during nametable shutdown. Signed-off-by:
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Erik Hugne authored
[ Upstream commit edcc0511 ] When a topology server subscriber is disconnected, the associated connection id is set to zero. A check vs zero is then done in the subscription timeout function to see if the subscriber have been shut down. This is unnecessary, because all subscription timers will be cancelled when a subscriber terminates. Setting the connection id to zero is actually harmful because id zero is the identity of the topology server listening socket, and can cause a race that leads to this socket being closed instead. Signed-off-by:
Ying Xue <ying.xue@windriver.com> Reviewed-by:
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Ying Xue authored
[ Upstream commit 4652edb7 ] When tipc_conn_sendmsg() calls tipc_conn_lookup() to query a connection instance, its reference count value is increased if it's found. But subsequently if it's found that the connection is closed, the work of sending message is not queued into its server send workqueue, and the connection reference count is not decreased. This will cause a reference count leak. To reproduce this problem, an application would need to open and closes topology server connections with high intensity. We fix this by immediately decrementing the connection reference count if a send fails due to the connection being closed. Signed-off-by:
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Ying Xue authored
[ Upstream commit 6d4ebeb4 ] Currently connection shutdown callback function is called when connection instance is released in tipc_conn_kref_release(), and receiving packets and sending packets are running in different threads. Even if connection is closed by the thread of receiving packets, its shutdown callback may not be called immediately as the connection reference count is non-zero at that moment. So, although the connection is shut down by the thread of receiving packets, the thread of sending packets doesn't know it. Before its shutdown callback is invoked to tell the sending thread its connection has been closed, the sending thread may deliver messages by tipc_conn_sendmsg(), this is why the following error information appears: "Sending subscription event failed, no memory" To eliminate it, allow connection shutdown callback function to be called before connection id is removed in tipc_close_conn(), which makes the sending thread know the truth in time that its socket is closed so that it doesn't send message to it. We also remove the "Sending XXX failed..." error reporting for topology and config services. Signed-off-by:
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Linus Lüssing authored
[ Upstream commit 6565b9ee ] MLD queries are supposed to have an IPv6 link-local source address according to RFC2710, section 4 and RFC3810, section 5.1.14. This patch adds a sanity check to ignore such broken MLD queries. Without this check, such malformed MLD queries can result in a denial of service: The queries are ignored by any MLD listener therefore they will not respond with an MLD report. However, without this patch these malformed MLD queries would enable the snooping part in the bridge code, potentially shutting down the according ports towards these hosts for multicast traffic as the bridge did not learn about these listeners. Reported-by:
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Daniel Borkmann authored
[ Upstream commit c485658b ] While working on ec0223ec ("net: sctp: fix sctp_sf_do_5_1D_ce to verify if we/peer is AUTH capable"), we noticed that there's a skb memory leakage in the error path. Running the same reproducer as in ec0223ec and by unconditionally jumping to the error label (to simulate an error condition) in sctp_sf_do_5_1D_ce() receive path lets kmemleak detector bark about the unfreed chunk->auth_chunk skb clone: Unreferenced object 0xffff8800b8f3a000 (size 256): comm "softirq", pid 0, jiffies 4294769856 (age 110.757s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 89 ab 75 5e d4 01 58 13 00 00 00 00 00 00 00 00 ..u^..X......... backtrace: [<ffffffff816660be>] kmemleak_alloc+0x4e/0xb0 [<ffffffff8119f328>] kmem_cache_alloc+0xc8/0x210 [<ffffffff81566929>] skb_clone+0x49/0xb0 [<ffffffffa0467459>] sctp_endpoint_bh_rcv+0x1d9/0x230 [sctp] [<ffffffffa046fdbc>] sctp_inq_push+0x4c/0x70 [sctp] [<ffffffffa047e8de>] sctp_rcv+0x82e/0x9a0 [sctp] [<ffffffff815abd38>] ip_local_deliver_finish+0xa8/0x210 [<ffffffff815a64af>] nf_reinject+0xbf/0x180 [<ffffffffa04b4762>] nfqnl_recv_verdict+0x1d2/0x2b0 [nfnetlink_queue] [<ffffffffa04aa40b>] nfnetlink_rcv_msg+0x14b/0x250 [nfnetlink] [<ffffffff815a3269>] netlink_rcv_skb+0xa9/0xc0 [<ffffffffa04aa7cf>] nfnetlink_rcv+0x23f/0x408 [nfnetlink] [<ffffffff815a2bd8>] netlink_unicast+0x168/0x250 [<ffffffff815a2fa1>] netlink_sendmsg+0x2e1/0x3f0 [<ffffffff8155cc6b>] sock_sendmsg+0x8b/0xc0 [<ffffffff8155d449>] ___sys_sendmsg+0x369/0x380 What happens is that commit bbd0d598 clones the skb containing the AUTH chunk in sctp_endpoint_bh_rcv() when having the edge case that an endpoint requires COOKIE-ECHO chunks to be authenticated: ---------- INIT[RANDOM; CHUNKS; HMAC-ALGO] ----------> <------- INIT-ACK[RANDOM; CHUNKS; HMAC-ALGO] --------- ------------------ AUTH; COOKIE-ECHO ----------------> <-------------------- COOKIE-ACK --------------------- When we enter sctp_sf_do_5_1D_ce() and before we actually get to the point where we process (and subsequently free) a non-NULL chunk->auth_chunk, we could hit the "goto nomem_init" path from an error condition and thus leave the cloned skb around w/o freeing it. The fix is to centrally free such clones in sctp_chunk_destroy() handler that is invoked from sctp_chunk_free() after all refs have dropped; and also move both kfree_skb(chunk->auth_chunk) there, so that chunk->auth_chunk is either NULL (since sctp_chunkify() allocs new chunks through kmem_cache_zalloc()) or non-NULL with a valid skb pointer. chunk->skb and chunk->auth_chunk are the only skbs in the sctp_chunk structure that need to be handeled. While at it, we should use consume_skb() for both. It is the same as dev_kfree_skb() but more appropriately named as we are not a device but a protocol. Also, this effectively replaces the kfree_skb() from both invocations into consume_skb(). Functions are the same only that kfree_skb() assumes that the frame was being dropped after a failure (e.g. for tools like drop monitor), usage of consume_skb() seems more appropriate in function sctp_chunk_destroy() though. Fixes: bbd0d598 ("[SCTP]: Implement the receive and verification of AUTH chunk") Signed-off-by:
Daniel Borkmann <dborkman@redhat.com> Cc: Vlad Yasevich <yasevich@gmail.com> Cc: Neil Horman <nhorman@tuxdriver.com> Acked-by:
Vlad Yasevich <vyasevich@gmail.com> Acked-by:
Neil Horman <nhorman@tuxdriver.com> Signed-off-by:
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Nikolay Aleksandrov authored
[ Upstream commit 24b9bf43 ] I stumbled upon this very serious bug while hunting for another one, it's a very subtle race condition between inet_frag_evictor, inet_frag_intern and the IPv4/6 frag_queue and expire functions (basically the users of inet_frag_kill/inet_frag_put). What happens is that after a fragment has been added to the hash chain but before it's been added to the lru_list (inet_frag_lru_add) in inet_frag_intern, it may get deleted (either by an expired timer if the system load is high or the timer sufficiently low, or by the fraq_queue function for different reasons) before it's added to the lru_list, then after it gets added it's a matter of time for the evictor to get to a piece of memory which has been freed leading to a number of different bugs depending on what's left there. I've been able to trigger this on both IPv4 and IPv6 (which is normal as the frag code is the same), but it's been much more difficult to trigger on IPv4 due to the protocol differences about how fragments are treated. The setup I used to reproduce this is: 2 machines with 4 x 10G bonded in a RR bond, so the same flow can be seen on multiple cards at the same time. Then I used multiple instances of ping/ping6 to generate fragmented packets and flood the machines with them while running other processes to load the attacked machine. *It is very important to have the _same flow_ coming in on multiple CPUs concurrently. Usually the attacked machine would die in less than 30 minutes, if configured properly to have many evictor calls and timeouts it could happen in 10 minutes or so. An important point to make is that any caller (frag_queue or timer) of inet_frag_kill will remove both the timer refcount and the original/guarding refcount thus removing everything that's keeping the frag from being freed at the next inet_frag_put. All of this could happen before the frag was ever added to the LRU list, then it gets added and the evictor uses a freed fragment. An example for IPv6 would be if a fragment is being added and is at the stage of being inserted in the hash after the hash lock is released, but before inet_frag_lru_add executes (or is able to obtain the lru lock) another overlapping fragment for the same flow arrives at a different CPU which finds it in the hash, but since it's overlapping it drops it invoking inet_frag_kill and thus removing all guarding refcounts, and afterwards freeing it by invoking inet_frag_put which removes the last refcount added previously by inet_frag_find, then inet_frag_lru_add gets executed by inet_frag_intern and we have a freed fragment in the lru_list. The fix is simple, just move the lru_add under the hash chain locked region so when a removing function is called it'll have to wait for the fragment to be added to the lru_list, and then it'll remove it (it works because the hash chain removal is done before the lru_list one and there's no window between the two list adds when the frag can get dropped). With this fix applied I couldn't kill the same machine in 24 hours with the same setup. Fixes: 3ef0eb0d ("net: frag, move LRU list maintenance outside of rwlock") CC: Florian Westphal <fw@strlen.de> CC: Jesper Dangaard Brouer <brouer@redhat.com> CC: David S. Miller <davem@davemloft.net> Signed-off-by:
Nikolay Aleksandrov <nikolay@redhat.com> Acked-by:
Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by:
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Paul Moore authored
commit f64410ec upstream. This patch is based on an earlier patch by Eric Paris, he describes the problem below: "If an inode is accessed before policy load it will get placed on a list of inodes to be initialized after policy load. After policy load we call inode_doinit() which calls inode_doinit_with_dentry() on all inodes accessed before policy load. In the case of inodes in procfs that means we'll end up at the bottom where it does: /* Default to the fs superblock SID. */ isec->sid = sbsec->sid; if ((sbsec->flags & SE_SBPROC) && !S_ISLNK(inode->i_mode)) { if (opt_dentry) { isec->sclass = inode_mode_to_security_class(...) rc = selinux_proc_get_sid(opt_dentry, isec->sclass, &sid); if (rc) goto out_unlock; isec->sid = sid; } } Since opt_dentry is null, we'll never call selinux_proc_get_sid() and will leave the inode labeled with the label on the superblock. I believe a fix would be to mimic the behavior of xattrs. Look for an alias of the inode. If it can't be found, just leave the inode uninitialized (and pick it up later) if it can be found, we should be able to call selinux_proc_get_sid() ..." On a system exhibiting this problem, you will notice a lot of files in /proc with the generic "proc_t" type (at least the ones that were accessed early in the boot), for example: # ls -Z /proc/sys/kernel/shmmax | awk '{ print $4 " " $5 }' system_u:object_r:proc_t:s0 /proc/sys/kernel/shmmax However, with this patch in place we see the expected result: # ls -Z /proc/sys/kernel/shmmax | awk '{ print $4 " " $5 }' system_u:object_r:sysctl_kernel_t:s0 /proc/sys/kernel/shmmax Cc: Eric Paris <eparis@redhat.com> Signed-off-by:
Paul Moore <pmoore@redhat.com> Acked-by:
Eric Paris <eparis@redhat.com> Signed-off-by:
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- 03 Apr, 2014 7 commits
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Greg Kroah-Hartman authored
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Daniel Borkmann authored
commit b22f5126 upstream. Some occurences in the netfilter tree use skb_header_pointer() in the following way ... struct dccp_hdr _dh, *dh; ... skb_header_pointer(skb, dataoff, sizeof(_dh), &dh); ... where dh itself is a pointer that is being passed as the copy buffer. Instead, we need to use &_dh as the forth argument so that we're copying the data into an actual buffer that sits on the stack. Currently, we probably could overwrite memory on the stack (e.g. with a possibly mal-formed DCCP packet), but unintentionally, as we only want the buffer to be placed into _dh variable. Fixes: 2bc78049 ("[NETFILTER]: nf_conntrack: add DCCP protocol support") Signed-off-by:
Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by:
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Li Zefan authored
commit 0ab02ca8 upstream. Setup cgroupfs like this: # mount -t cgroup -o cpuacct xxx /cgroup # mkdir /cgroup/sub1 # mkdir /cgroup/sub2 Then run these two commands: # for ((; ;)) { mkdir /cgroup/sub1/tmp && rmdir /mnt/sub1/tmp; } & # for ((; ;)) { mkdir /cgroup/sub2/tmp && rmdir /mnt/sub2/tmp; } & After seconds you may see this warning: ------------[ cut here ]------------ WARNING: CPU: 1 PID: 25243 at lib/idr.c:527 sub_remove+0x87/0x1b0() idr_remove called for id=6 which is not allocated. ... Call Trace: [<ffffffff8156063c>] dump_stack+0x7a/0x96 [<ffffffff810591ac>] warn_slowpath_common+0x8c/0xc0 [<ffffffff81059296>] warn_slowpath_fmt+0x46/0x50 [<ffffffff81300aa7>] sub_remove+0x87/0x1b0 [<ffffffff810f3f02>] ? css_killed_work_fn+0x32/0x1b0 [<ffffffff81300bf5>] idr_remove+0x25/0xd0 [<ffffffff810f2bab>] cgroup_destroy_css_killed+0x5b/0xc0 [<ffffffff810f4000>] css_killed_work_fn+0x130/0x1b0 [<ffffffff8107cdbc>] process_one_work+0x26c/0x550 [<ffffffff8107eefe>] worker_thread+0x12e/0x3b0 [<ffffffff81085f96>] kthread+0xe6/0xf0 [<ffffffff81570bac>] ret_from_fork+0x7c/0xb0 ---[ end trace 2d1577ec10cf80d0 ]--- It's because allocating/removing cgroup ID is not properly synchronized. The bug was introduced when we converted cgroup_ida to cgroup_idr. While synchronization is already done inside ida_simple_{get,remove}(), users are responsible for concurrent calls to idr_{alloc,remove}(). tj: Refreshed on top of b58c8998 ("cgroup: fix error return from cgroup_create()"). [mhocko@suse.cz: ported to 3.12] Fixes: 4e96ee8e ("cgroup: convert cgroup_ida to cgroup_idr") Cc: <stable@vger.kernel.org> #3.12+ Reported-by:
Michal Hocko <mhocko@suse.cz> Signed-off-by:
Li Zefan <lizefan@huawei.com> Signed-off-by:
Jiri Slaby <jslaby@suse.cz> Signed-off-by:
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David Rientjes authored
commit 668f9abb upstream. Commit bf6bddf1 ("mm: introduce compaction and migration for ballooned pages") introduces page_count(page) into memory compaction which dereferences page->first_page if PageTail(page). This results in a very rare NULL pointer dereference on the aforementioned page_count(page). Indeed, anything that does compound_head(), including page_count() is susceptible to racing with prep_compound_page() and seeing a NULL or dangling page->first_page pointer. This patch uses Andrea's implementation of compound_trans_head() that deals with such a race and makes it the default compound_head() implementation. This includes a read memory barrier that ensures that if PageTail(head) is true that we return a head page that is neither NULL nor dangling. The patch then adds a store memory barrier to prep_compound_page() to ensure page->first_page is set. This is the safest way to ensure we see the head page that we are expecting, PageTail(page) is already in the unlikely() path and the memory barriers are unfortunately required. Hugetlbfs is the exception, we don't enforce a store memory barrier during init since no race is possible. Signed-off-by:
David Rientjes <rientjes@google.com> Cc: Holger Kiehl <Holger.Kiehl@dwd.de> Cc: Christoph Lameter <cl@linux.com> Cc: Rafael Aquini <aquini@redhat.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Michal Hocko <mhocko@suse.cz> Cc: Mel Gorman <mgorman@suse.de> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Rik van Riel <riel@redhat.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
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Al Viro authored
commit 38129a13 upstream. fixes RCU bug - walking through hlist is safe in face of element moves, since it's self-terminating. Cyclic lists are not - if we end up jumping to another hash chain, we'll loop infinitely without ever hitting the original list head. [fix for dumb braino folded] Spotted by: Max Kellermann <mk@cm4all.com> Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk> Signed-off-by:
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Al Viro authored
commit 0b1b901b upstream. If the dest_mnt is not shared, propagate_mnt() does nothing - there's no mounts to propagate to and thus no copies to create. Might as well don't bother calling it in that case. Signed-off-by:
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Al Viro authored
commit 1d6a32ac upstream. preparation to switching mnt_hash to hlist Signed-off-by:
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