- 15 Dec, 2015 32 commits
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Daniel Borkmann authored
[ Upstream commit fbca9d2d ] During own review but also reported by Dmitry's syzkaller [1] it has been noticed that we trigger a heap out-of-bounds access on eBPF array maps when updating elements. This happens with each map whose map->value_size (specified during map creation time) is not multiple of 8 bytes. In array_map_alloc(), elem_size is round_up(attr->value_size, 8) and used to align array map slots for faster access. However, in function array_map_update_elem(), we update the element as ... memcpy(array->value + array->elem_size * index, value, array->elem_size); ... where we access 'value' out-of-bounds, since it was allocated from map_update_elem() from syscall side as kmalloc(map->value_size, GFP_USER) and later on copied through copy_from_user(value, uvalue, map->value_size). Thus, up to 7 bytes, we can access out-of-bounds. Same could happen from within an eBPF program, where in worst case we access beyond an eBPF program's designated stack. Since 1be7f75d ("bpf: enable non-root eBPF programs") didn't hit an official release yet, it only affects priviledged users. In case of array_map_lookup_elem(), the verifier prevents eBPF programs from accessing beyond map->value_size through check_map_access(). Also from syscall side map_lookup_elem() only copies map->value_size back to user, so nothing could leak. [1] http://github.com/google/syzkaller Fixes: 28fbcfa0 ("bpf: add array type of eBPF maps") Reported-by:
Dmitry Vyukov <dvyukov@google.com> Signed-off-by:
Daniel Borkmann <daniel@iogearbox.net> Acked-by:
Alexei Starovoitov <ast@kernel.org> Signed-off-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Quentin Casasnovas authored
[ Upstream commit 8c7188b2 ] Sasha's found a NULL pointer dereference in the RDS connection code when sending a message to an apparently unbound socket. The problem is caused by the code checking if the socket is bound in rds_sendmsg(), which checks the rs_bound_addr field without taking a lock on the socket. This opens a race where rs_bound_addr is temporarily set but where the transport is not in rds_bind(), leading to a NULL pointer dereference when trying to dereference 'trans' in __rds_conn_create(). Vegard wrote a reproducer for this issue, so kindly ask him to share if you're interested. I cannot reproduce the NULL pointer dereference using Vegard's reproducer with this patch, whereas I could without. Complete earlier incomplete fix to CVE-2015-6937: 74e98eb0 ("RDS: verify the underlying transport exists before creating a connection") Cc: David S. Miller <davem@davemloft.net> Cc: stable@vger.kernel.org Reviewed-by:
Vegard Nossum <vegard.nossum@oracle.com> Reviewed-by:
Sasha Levin <sasha.levin@oracle.com> Acked-by:
Santosh Shilimkar <santosh.shilimkar@oracle.com> Signed-off-by:
Quentin Casasnovas <quentin.casasnovas@oracle.com> Signed-off-by:
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Michal Kubeček authored
[ Upstream commit 264640fc ] If a fragmented multicast packet is received on an ethernet device which has an active macvlan on top of it, each fragment is duplicated and received both on the underlying device and the macvlan. If some fragments for macvlan are processed before the whole packet for the underlying device is reassembled, the "overlapping fragments" test in ip6_frag_queue() discards the whole fragment queue. To resolve this, add device ifindex to the search key and require it to match reassembling multicast packets and packets to link-local addresses. Note: similar patch has been already submitted by Yoshifuji Hideaki in http://patchwork.ozlabs.org/patch/220979/ but got lost and forgotten for some reason. Signed-off-by:
Michal Kubecek <mkubecek@suse.cz> Signed-off-by:
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Aaro Koskinen authored
[ Upstream commit 3c25a860 ] Commit fcb26ec5 ("broadcom: move all PHY_ID's to header") updated broadcom_tbl to use PHY_IDs, but incorrectly replaced 0x0143bca0 with PHY_ID_BCM5482 (making a duplicate entry, and completely omitting the original). Fix that. Fixes: fcb26ec5 ("broadcom: move all PHY_ID's to header") Signed-off-by:
Aaro Koskinen <aaro.koskinen@iki.fi> Signed-off-by:
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Nikolay Aleksandrov authored
[ Upstream commit 4c698046 ] Similar to ipv4, when destroying an mrt table the static mfc entries and the static devices are kept, which leads to devices that can never be destroyed (because of refcnt taken) and leaked memory. Make sure that everything is cleaned up on netns destruction. Fixes: 8229efda ("netns: ip6mr: enable namespace support in ipv6 multicast forwarding code") CC: Benjamin Thery <benjamin.thery@bull.net> Signed-off-by:
Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Reviewed-by:
Cong Wang <cwang@twopensource.com> Signed-off-by:
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Nikolay Aleksandrov authored
[ Upstream commit 0e615e96 ] When destroying an mrt table the static mfc entries and the static devices are kept, which leads to devices that can never be destroyed (because of refcnt taken) and leaked memory, for example: unreferenced object 0xffff880034c144c0 (size 192): comm "mfc-broken", pid 4777, jiffies 4320349055 (age 46001.964s) hex dump (first 32 bytes): 98 53 f0 34 00 88 ff ff 98 53 f0 34 00 88 ff ff .S.4.....S.4.... ef 0a 0a 14 01 02 03 04 00 00 00 00 01 00 00 00 ................ backtrace: [<ffffffff815c1b9e>] kmemleak_alloc+0x4e/0xb0 [<ffffffff811ea6e0>] kmem_cache_alloc+0x190/0x300 [<ffffffff815931cb>] ip_mroute_setsockopt+0x5cb/0x910 [<ffffffff8153d575>] do_ip_setsockopt.isra.11+0x105/0xff0 [<ffffffff8153e490>] ip_setsockopt+0x30/0xa0 [<ffffffff81564e13>] raw_setsockopt+0x33/0x90 [<ffffffff814d1e14>] sock_common_setsockopt+0x14/0x20 [<ffffffff814d0b51>] SyS_setsockopt+0x71/0xc0 [<ffffffff815cdbf6>] entry_SYSCALL_64_fastpath+0x16/0x7a [<ffffffffffffffff>] 0xffffffffffffffff Make sure that everything is cleaned on netns destruction. Signed-off-by:
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Daniel Borkmann authored
[ Upstream commit 6900317f ] David and HacKurx reported a following/similar size overflow triggered in a grsecurity kernel, thanks to PaX's gcc size overflow plugin: (Already fixed in later grsecurity versions by Brad and PaX Team.) [ 1002.296137] PAX: size overflow detected in function scm_detach_fds net/core/scm.c:314 cicus.202_127 min, count: 4, decl: msg_controllen; num: 0; context: msghdr; [ 1002.296145] CPU: 0 PID: 3685 Comm: scm_rights_recv Not tainted 4.2.3-grsec+ #7 [ 1002.296149] Hardware name: Apple Inc. MacBookAir5,1/Mac-66F35F19FE2A0D05, [...] [ 1002.296153] ffffffff81c27366 0000000000000000 ffffffff81c27375 ffffc90007843aa8 [ 1002.296162] ffffffff818129ba 0000000000000000 ffffffff81c27366 ffffc90007843ad8 [ 1002.296169] ffffffff8121f838 fffffffffffffffc fffffffffffffffc ffffc90007843e60 [ 1002.296176] Call Trace: [ 1002.296190] [<ffffffff818129ba>] dump_stack+0x45/0x57 [ 1002.296200] [<ffffffff8121f838>] report_size_overflow+0x38/0x60 [ 1002.296209] [<ffffffff816a979e>] scm_detach_fds+0x2ce/0x300 [ 1002.296220] [<ffffffff81791899>] unix_stream_read_generic+0x609/0x930 [ 1002.296228] [<ffffffff81791c9f>] unix_stream_recvmsg+0x4f/0x60 [ 1002.296236] [<ffffffff8178dc00>] ? unix_set_peek_off+0x50/0x50 [ 1002.296243] [<ffffffff8168fac7>] sock_recvmsg+0x47/0x60 [ 1002.296248] [<ffffffff81691522>] ___sys_recvmsg+0xe2/0x1e0 [ 1002.296257] [<ffffffff81693496>] __sys_recvmsg+0x46/0x80 [ 1002.296263] [<ffffffff816934fc>] SyS_recvmsg+0x2c/0x40 [ 1002.296271] [<ffffffff8181a3ab>] entry_SYSCALL_64_fastpath+0x12/0x85 Further investigation showed that this can happen when an *odd* number of fds are being passed over AF_UNIX sockets. In these cases CMSG_LEN(i * sizeof(int)) and CMSG_SPACE(i * sizeof(int)), where i is the number of successfully passed fds, differ by 4 bytes due to the extra CMSG_ALIGN() padding in CMSG_SPACE() to an 8 byte boundary on 64 bit. The padding is used to align subsequent cmsg headers in the control buffer. When the control buffer passed in from the receiver side *lacks* these 4 bytes (e.g. due to buggy/wrong API usage), then msg->msg_controllen will overflow in scm_detach_fds(): int cmlen = CMSG_LEN(i * sizeof(int)); <--- cmlen w/o tail-padding err = put_user(SOL_SOCKET, &cm->cmsg_level); if (!err) err = put_user(SCM_RIGHTS, &cm->cmsg_type); if (!err) err = put_user(cmlen, &cm->cmsg_len); if (!err) { cmlen = CMSG_SPACE(i * sizeof(int)); <--- cmlen w/ 4 byte extra tail-padding msg->msg_control += cmlen; msg->msg_controllen -= cmlen; <--- iff no tail-padding space here ... } ... wrap-around F.e. it will wrap to a length of 18446744073709551612 bytes in case the receiver passed in msg->msg_controllen of 20 bytes, and the sender properly transferred 1 fd to the receiver, so that its CMSG_LEN results in 20 bytes and CMSG_SPACE in 24 bytes. In case of MSG_CMSG_COMPAT (scm_detach_fds_compat()), I haven't seen an issue in my tests as alignment seems always on 4 byte boundary. Same should be in case of native 32 bit, where we end up with 4 byte boundaries as well. In practice, passing msg->msg_controllen of 20 to recvmsg() while receiving a single fd would mean that on successful return, msg->msg_controllen is being set by the kernel to 24 bytes instead, thus more than the input buffer advertised. It could f.e. become an issue if such application later on zeroes or copies the control buffer based on the returned msg->msg_controllen elsewhere. Maximum number of fds we can send is a hard upper limit SCM_MAX_FD (253). Going over the code, it seems like msg->msg_controllen is not being read after scm_detach_fds() in scm_recv() anymore by the kernel, good! Relevant recvmsg() handler are unix_dgram_recvmsg() (unix_seqpacket_recvmsg()) and unix_stream_recvmsg(). Both return back to their recvmsg() caller, and ___sys_recvmsg() places the updated length, that is, new msg_control - old msg_control pointer into msg->msg_controllen (hence the 24 bytes seen in the example). Long time ago, Wei Yongjun fixed something related in commit 1ac70e7a ("[NET]: Fix function put_cmsg() which may cause usr application memory overflow"). RFC3542, section 20.2. says: The fields shown as "XX" are possible padding, between the cmsghdr structure and the data, and between the data and the next cmsghdr structure, if required by the implementation. While sending an application may or may not include padding at the end of last ancillary data in msg_controllen and implementations must accept both as valid. On receiving a portable application must provide space for padding at the end of the last ancillary data as implementations may copy out the padding at the end of the control message buffer and include it in the received msg_controllen. When recvmsg() is called if msg_controllen is too small for all the ancillary data items including any trailing padding after the last item an implementation may set MSG_CTRUNC. Since we didn't place MSG_CTRUNC for already quite a long time, just do the same as in 1ac70e7a to avoid an overflow. Btw, even man-page author got this wrong :/ See db939c9b26e9 ("cmsg.3: Fix error in SCM_RIGHTS code sample"). Some people must have copied this (?), thus it got triggered in the wild (reported several times during boot by David and HacKurx). No Fixes tag this time as pre 2002 (that is, pre history tree). Reported-by:
David Sterba <dave@jikos.cz> Reported-by:
HacKurx <hackurx@gmail.com> Cc: PaX Team <pageexec@freemail.hu> Cc: Emese Revfy <re.emese@gmail.com> Cc: Brad Spengler <spender@grsecurity.net> Cc: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Cc: Eric Dumazet <edumazet@google.com> Reviewed-by:
Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by:
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Eric Dumazet authored
[ Upstream commit 142a2e7e ] Dmitry provided a syzkaller (http://github.com/google/syzkaller) generated program that triggers the WARNING at net/ipv4/tcp.c:1729 in tcp_recvmsg() : WARN_ON(tp->copied_seq != tp->rcv_nxt && !(flags & (MSG_PEEK | MSG_TRUNC))); His program is specifically attempting a Cross SYN TCP exchange, that we support (for the pleasure of hackers ?), but it looks we lack proper tcp->copied_seq initialization. Thanks again Dmitry for your report and testings. Signed-off-by:
Eric Dumazet <edumazet@google.com> Reported-by:
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Eric Dumazet authored
[ Upstream commit 5d4c9bfb ] tcp_send_rcvq() is used for re-injecting data into tcp receive queue. Problems : - No check against size is performed, allowed user to fool kernel in attempting very large memory allocations, eventually triggering OOM when memory is fragmented. - In case of fault during the copy we do not return correct errno. Lets use alloc_skb_with_frags() to cook optimal skbs. Fixes: 292e8d8c ("tcp: Move rcvq sending to tcp_input.c") Fixes: c0e88ff0 ("tcp: Repair socket queues") Signed-off-by:
Pavel Emelyanov <xemul@parallels.com> Signed-off-by:
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Yuchung Cheng authored
[ Upstream commit 0e45f4da ] Some middle-boxes black-hole the data after the Fast Open handshake (https://www.ietf.org/proceedings/94/slides/slides-94-tcpm-13.pdf). The exact reason is unknown. The work-around is to disable Fast Open temporarily after multiple recurring timeouts with few or no data delivered in the established state. Signed-off-by:
Yuchung Cheng <ycheng@google.com> Signed-off-by:
Christoph Paasch <cpaasch@apple.com> Signed-off-by:
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Eric Dumazet authored
[ Upstream commit 1b8e6a01 ] When a passive TCP is created, we eventually call tcp_md5_do_add() with sk pointing to the child. It is not owner by the user yet (we will add this socket into listener accept queue a bit later anyway) But we do own the spinlock, so amend the lockdep annotation to avoid following splat : [ 8451.090932] net/ipv4/tcp_ipv4.c:923 suspicious rcu_dereference_protected() usage! [ 8451.090932] [ 8451.090932] other info that might help us debug this: [ 8451.090932] [ 8451.090934] [ 8451.090934] rcu_scheduler_active = 1, debug_locks = 1 [ 8451.090936] 3 locks held by socket_sockopt_/214795: [ 8451.090936] #0: (rcu_read_lock){.+.+..}, at: [<ffffffff855c6ac1>] __netif_receive_skb_core+0x151/0xe90 [ 8451.090947] #1: (rcu_read_lock){.+.+..}, at: [<ffffffff85618143>] ip_local_deliver_finish+0x43/0x2b0 [ 8451.090952] #2: (slock-AF_INET){+.-...}, at: [<ffffffff855acda5>] sk_clone_lock+0x1c5/0x500 [ 8451.090958] [ 8451.090958] stack backtrace: [ 8451.090960] CPU: 7 PID: 214795 Comm: socket_sockopt_ [ 8451.091215] Call Trace: [ 8451.091216] <IRQ> [<ffffffff856fb29c>] dump_stack+0x55/0x76 [ 8451.091229] [<ffffffff85123b5b>] lockdep_rcu_suspicious+0xeb/0x110 [ 8451.091235] [<ffffffff8564544f>] tcp_md5_do_add+0x1bf/0x1e0 [ 8451.091239] [<ffffffff85645751>] tcp_v4_syn_recv_sock+0x1f1/0x4c0 [ 8451.091242] [<ffffffff85642b27>] ? tcp_v4_md5_hash_skb+0x167/0x190 [ 8451.091246] [<ffffffff85647c78>] tcp_check_req+0x3c8/0x500 [ 8451.091249] [<ffffffff856451ae>] ? tcp_v4_inbound_md5_hash+0x11e/0x190 [ 8451.091253] [<ffffffff85647170>] tcp_v4_rcv+0x3c0/0x9f0 [ 8451.091256] [<ffffffff85618143>] ? ip_local_deliver_finish+0x43/0x2b0 [ 8451.091260] [<ffffffff856181b6>] ip_local_deliver_finish+0xb6/0x2b0 [ 8451.091263] [<ffffffff85618143>] ? ip_local_deliver_finish+0x43/0x2b0 [ 8451.091267] [<ffffffff85618d38>] ip_local_deliver+0x48/0x80 [ 8451.091270] [<ffffffff85618510>] ip_rcv_finish+0x160/0x700 [ 8451.091273] [<ffffffff8561900e>] ip_rcv+0x29e/0x3d0 [ 8451.091277] [<ffffffff855c74b7>] __netif_receive_skb_core+0xb47/0xe90 Fixes: a8afca03 ("tcp: md5: protects md5sig_info with RCU") Signed-off-by:
Willem de Bruijn <willemb@google.com> Signed-off-by:
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Bjørn Mork authored
[ Upstream commit 68242a5a ] Thomas reports " 4gsystems sells two total different LTE-surfsticks under the same name. .. The newer version of XS Stick W100 is from "omega" .. Under windows the driver switches to the same ID, and uses MI03\6 for network and MI01\6 for modem. .. echo "1c9e 9b01" > /sys/bus/usb/drivers/qmi_wwan/new_id echo "1c9e 9b01" > /sys/bus/usb-serial/drivers/option1/new_id T: Bus=01 Lev=01 Prnt=01 Port=03 Cnt=01 Dev#= 4 Spd=480 MxCh= 0 D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 P: Vendor=1c9e ProdID=9b01 Rev=02.32 S: Manufacturer=USB Modem S: Product=USB Modem S: SerialNumber= C: #Ifs= 5 Cfg#= 1 Atr=80 MxPwr=500mA I: If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option I: If#= 1 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=option I: If#= 2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=option I: If#= 3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=qmi_wwan I: If#= 4 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage Now all important things are there: wwp0s29f7u2i3 (net), ttyUSB2 (at), cdc-wdm0 (qmi), ttyUSB1 (at) There is also ttyUSB0, but it is not usable, at least not for at. The device works well with qmi and ModemManager-NetworkManager. " Reported-by:
Thomas Schäfer <tschaefer@t-online.de> Signed-off-by:
Bjørn Mork <bjorn@mork.no> Signed-off-by:
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Neil Horman authored
[ Upstream commit 41033f02 ] the OUTMCAST stat is double incremented, getting bumped once in the mcast code itself, and again in the common ip output path. Remove the mcast bump, as its not needed Validated by the reporter, with good results Signed-off-by:
Neil Horman <nhorman@tuxdriver.com> Reported-by:
Claus Jensen <claus.jensen@microsemi.com> CC: Claus Jensen <claus.jensen@microsemi.com> CC: David Miller <davem@davemloft.net> Signed-off-by:
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Pavel Fedin authored
[ Upstream commit 7750130d ] In some cases the crash is caused by nicvf_remove() being called from outside. For example, if we try to feed the device to vfio after the probe has failed for some reason. So, move the check to better place. Signed-off-by:
Pavel Fedin <p.fedin@samsung.com> Signed-off-by:
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Dragos Tatulea authored
[ Upstream commit 24cb7055 ] rtnl_fdb_dump always expects an index to be returned by the ndo_fdb_dump op, but when CONFIG_NET_SWITCHDEV is off, it returns an error. Fix that by returning the given unmodified idx. A similar fix was 0890cf6c ("switchdev: fix return value of switchdev_port_fdb_dump in case of error") but for the CONFIG_NET_SWITCHDEV=y case. Fixes: 45d4122c ("switchdev: add support for fdb add/del/dump via switchdev_port_obj ops.") Signed-off-by:
Dragos Tatulea <dragos@endocode.com> Acked-by:
Jiri Pirko <jiri@mellanox.com> Signed-off-by:
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Jason A. Donenfeld authored
[ Upstream commit b4fe85f9 ] Drivers like vxlan use the recently introduced udp_tunnel_xmit_skb/udp_tunnel6_xmit_skb APIs. udp_tunnel6_xmit_skb makes use of ip6tunnel_xmit, and ip6tunnel_xmit, after sending the packet, updates the struct stats using the usual u64_stats_update_begin/end calls on this_cpu_ptr(dev->tstats). udp_tunnel_xmit_skb makes use of iptunnel_xmit, which doesn't touch tstats, so drivers like vxlan, immediately after, call iptunnel_xmit_stats, which does the same thing - calls u64_stats_update_begin/end on this_cpu_ptr(dev->tstats). While vxlan is probably fine (I don't know?), calling a similar function from, say, an unbound workqueue, on a fully preemptable kernel causes real issues: [ 188.434537] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u8:0/6 [ 188.435579] caller is debug_smp_processor_id+0x17/0x20 [ 188.435583] CPU: 0 PID: 6 Comm: kworker/u8:0 Not tainted 4.2.6 #2 [ 188.435607] Call Trace: [ 188.435611] [<ffffffff8234e936>] dump_stack+0x4f/0x7b [ 188.435615] [<ffffffff81915f3d>] check_preemption_disabled+0x19d/0x1c0 [ 188.435619] [<ffffffff81915f77>] debug_smp_processor_id+0x17/0x20 The solution would be to protect the whole this_cpu_ptr(dev->tstats)/u64_stats_update_begin/end blocks with disabling preemption and then reenabling it. Signed-off-by:
Jason A. Donenfeld <Jason@zx2c4.com> Acked-by:
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Eran Ben Elisha authored
[ Upstream commit f5adbfee ] When cleaning slave's counter resources, we hold a spinlock that protects the slave's counters list. As part of the clean, we call __mlx4_clear_if_stat which calls mlx4_alloc_cmd_mailbox which is a sleepable function. In order to fix this issue, hold the spinlock, and copy all counter indices into a temporary array, and release the spinlock. Afterwards, iterate over this array and free every counter. Repeat this scenario until the original list is empty (a new counter might have been added while releasing the counters from the temporary array). Fixes: b72ca7e9 ("net/mlx4_core: Reset counters data when freed") Reported-by:
Moni Shoua <monis@mellanox.com> Tested-by:
Jack Morgenstein <jackm@dev.mellanox.co.il> Signed-off-by:
Eran Ben Elisha <eranbe@mellanox.com> Signed-off-by:
Or Gerlitz <ogerlitz@mellanox.com> Signed-off-by:
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lucien authored
[ Upstream commit ed5a377d ] now sctp auth cannot work well when setting a hmacid manually, which is caused by that we didn't use the network order for hmacid, so fix it by adding the transformation in sctp_auth_ep_set_hmacs. even we set hmacid with the network order in userspace, it still can't work, because of this condition in sctp_auth_ep_set_hmacs(): if (id > SCTP_AUTH_HMAC_ID_MAX) return -EOPNOTSUPP; so this wasn't working before and thus it won't break compatibility. Fixes: 65b07e5d ("[SCTP]: API updates to suport SCTP-AUTH extensions.") Signed-off-by:
Xin Long <lucien.xin@gmail.com> Signed-off-by:
Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Acked-by:
Vlad Yasevich <vyasevich@gmail.com> Signed-off-by:
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Daniel Borkmann authored
[ Upstream commit 5cfb4c8d ] Since it's introduction in commit 69e3c75f ("net: TX_RING and packet mmap"), TX_RING could be used from SOCK_DGRAM and SOCK_RAW side. When used with SOCK_DGRAM only, the size_max > dev->mtu + reserve check should have reserve as 0, but currently, this is unconditionally set (in it's original form as dev->hard_header_len). I think this is not correct since tpacket_fill_skb() would then take dev->mtu and dev->hard_header_len into account for SOCK_DGRAM, the extra VLAN_HLEN could be possible in both cases. Presumably, the reserve code was copied from packet_snd(), but later on missed the check. Make it similar as we have it in packet_snd(). Fixes: 69e3c75f ("net: TX_RING and packet mmap") Signed-off-by:
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Daniel Borkmann authored
[ Upstream commit c72219b7 ] In case no struct sockaddr_ll has been passed to packet socket's sendmsg() when doing a TX_RING flush run, then skb->protocol is set to po->num instead, which is the protocol passed via socket(2)/bind(2). Applications only xmitting can go the path of allocating the socket as socket(PF_PACKET, <mode>, 0) and do a bind(2) on the TX_RING with sll_protocol of 0. That way, register_prot_hook() is neither called on creation nor on bind time, which saves cycles when there's no interest in capturing anyway. That leaves us however with po->num 0 instead and therefore the TX_RING flush run sets skb->protocol to 0 as well. Eric reported that this leads to problems when using tools like trafgen over bonding device. I.e. the bonding's hash function could invoke the kernel's flow dissector, which depends on skb->protocol being properly set. In the current situation, all the traffic is then directed to a single slave. Fix it up by inferring skb->protocol from the Ethernet header when not set and we have ARPHRD_ETHER device type. This is only done in case of SOCK_RAW and where we have a dev->hard_header_len length. In case of ARPHRD_ETHER devices, this is guaranteed to cover ETH_HLEN, and therefore being accessed on the skb after the skb_store_bits(). Reported-by:
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Daniel Borkmann authored
[ Upstream commit 3c70c132 ] Packet sockets can be used by various net devices and are not really restricted to ARPHRD_ETHER device types. However, when currently checking for the extra 4 bytes that can be transmitted in VLAN case, our assumption is that we generally probe on ARPHRD_ETHER devices. Therefore, before looking into Ethernet header, check the device type first. This also fixes the issue where non-ARPHRD_ETHER devices could have no dev->hard_header_len in TX_RING SOCK_RAW case, and thus the check would test unfilled linear part of the skb (instead of non-linear). Fixes: 57f89bfa ("network: Allow af_packet to transmit +4 bytes for VLAN packets.") Fixes: 52f1454f ("packet: allow to transmit +4 byte in TX_RING slot for VLAN case") Signed-off-by:
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Daniel Borkmann authored
[ Upstream commit 8fd6c80d ] We concluded that the skb_probe_transport_header() should better be called unconditionally. Avoiding the call into the flow dissector has also not really much to do with the direct xmit mode. While it seems that only virtio_net code makes use of GSO from non RX/TX ring packet socket paths, we should probe for a transport header nevertheless before they hit devices. Reference: http://thread.gmane.org/gmane.linux.network/386173/Signed-off-by:
Jason Wang <jasowang@redhat.com> Signed-off-by:
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Daniel Borkmann authored
[ Upstream commit efdfa2f7 ] In tpacket_fill_skb() commit c1aad275 ("packet: set transport header before doing xmit") and later on 40893fd0 ("net: switch to use skb_probe_transport_header()") was probing for a transport header on the skb from a ring buffer slot, but at a time, where the skb has _not even_ been filled with data yet. So that call into the flow dissector is pretty useless. Lets do it after we've set up the skb frags. Fixes: c1aad275 ("packet: set transport header before doing xmit") Reported-by:
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Kamal Mostafa authored
[ Upstream commit d7475de5 ] Use the local uapi headers to keep in sync with "recently" added #define's (e.g. SKF_AD_VLAN_TPID). Refactored CFLAGS, and bpf_asm doesn't need -I. Fixes: 3f356385 ("filter: bpf_asm: add minimal bpf asm tool") Signed-off-by:
Kamal Mostafa <kamal@canonical.com> Acked-by:
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Martin KaFai Lau authored
[ Upstrem commit 02bcf4e0 ] All DST_NOCACHE rt6_info used to have rt->dst.from set to its parent. After commit 8e3d5be7 ("ipv6: Avoid double dst_free"), DST_NOCACHE is also set to rt6_info which does not have a parent (i.e. rt->dst.from is NULL). This patch catches the rt->dst.from == NULL case. Fixes: 8e3d5be7 ("ipv6: Avoid double dst_free") Signed-off-by:
Martin KaFai Lau <kafai@fb.com> Cc: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by:
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Martin KaFai Lau authored
[ Upstream commit 5973fb1e ] Since the expires of the DST_NOCACHE rt can be set during the ip6_rt_update_pmtu(), we also need to consider the expires value when doing ip6_dst_check(). This patches creates __rt6_check_expired() to only check the expire value (if one exists) of the current rt. In rt6_dst_from_check(), it adds __rt6_check_expired() as one of the condition check. Signed-off-by:
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Martin KaFai Lau authored
[ Upstream commit 0d3f6d29 ] The original bug report: https://bugzilla.redhat.com/show_bug.cgi?id=1272571 The setup has a IPv4 GRE tunnel running in a IPSec. The bug happens when ndisc starts sending router solicitation at the gre interface. The simplified oops stack is like: __lock_acquire+0x1b2/0x1c30 lock_acquire+0xb9/0x140 _raw_write_lock_bh+0x3f/0x50 __ip6_ins_rt+0x2e/0x60 ip6_ins_rt+0x49/0x50 ~~~~~~~~ __ip6_rt_update_pmtu.part.54+0x145/0x250 ip6_rt_update_pmtu+0x2e/0x40 ~~~~~~~~ ip_tunnel_xmit+0x1f1/0xf40 __gre_xmit+0x7a/0x90 ipgre_xmit+0x15a/0x220 dev_hard_start_xmit+0x2bd/0x480 __dev_queue_xmit+0x696/0x730 dev_queue_xmit+0x10/0x20 neigh_direct_output+0x11/0x20 ip6_finish_output2+0x21f/0x770 ip6_finish_output+0xa7/0x1d0 ip6_output+0x56/0x190 ~~~~~~~~ ndisc_send_skb+0x1d9/0x400 ndisc_send_rs+0x88/0xc0 ~~~~~~~~ The rt passed to ip6_rt_update_pmtu() is created by icmp6_dst_alloc() and it is not managed by the fib6 tree, so its rt6i_table == NULL. When __ip6_rt_update_pmtu() creates a RTF_CACHE clone, the newly created clone also has rt6i_table == NULL and it causes the ip6_ins_rt() oops. During pmtu update, we only want to create a RTF_CACHE clone from a rt which is currently managed (or owned) by the fib6 tree. It means either rt->rt6i_node != NULL or rt is a RTF_PCPU clone. It is worth to note that rt6i_table may not be NULL even it is not (yet) managed by the fib6 tree (e.g. addrconf_dst_alloc()). Hence, rt6i_node is a better check instead of rt6i_table. Fixes: 45e4fd26 ("ipv6: Only create RTF_CACHE routes after encountering pmtu") Signed-off-by:
Chris Siebenmann <cks-rhbugzilla@cs.toronto.edu> Cc: Chris Siebenmann <cks-rhbugzilla@cs.toronto.edu> Cc: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by:
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Hannes Frederic Sowa authored
[ Upstream commit 9490f886 ] sendpage did not care about credentials at all. This could lead to situations in which because of fd passing between processes we could append data to skbs with different scm data. It is illegal to splice those skbs together. Instead we have to allocate a new skb and if requested fill out the scm details. Fixes: 869e7c62 ("net: af_unix: implement stream sendpage support") Reported-by:
Al Viro <viro@zeniv.linux.org.uk> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Eric Dumazet <edumazet@google.com> Signed-off-by:
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Rainer Weikusat authored
[ Upstream commit 7d267278 ] Rainer Weikusat <rweikusat@mobileactivedefense.com> writes: An AF_UNIX datagram socket being the client in an n:1 association with some server socket is only allowed to send messages to the server if the receive queue of this socket contains at most sk_max_ack_backlog datagrams. This implies that prospective writers might be forced to go to sleep despite none of the message presently enqueued on the server receive queue were sent by them. In order to ensure that these will be woken up once space becomes again available, the present unix_dgram_poll routine does a second sock_poll_wait call with the peer_wait wait queue of the server socket as queue argument (unix_dgram_recvmsg does a wake up on this queue after a datagram was received). This is inherently problematic because the server socket is only guaranteed to remain alive for as long as the client still holds a reference to it. In case the connection is dissolved via connect or by the dead peer detection logic in unix_dgram_sendmsg, the server socket may be freed despite "the polling mechanism" (in particular, epoll) still has a pointer to the corresponding peer_wait queue. There's no way to forcibly deregister a wait queue with epoll. Based on an idea by Jason Baron, the patch below changes the code such that a wait_queue_t belonging to the client socket is enqueued on the peer_wait queue of the server whenever the peer receive queue full condition is detected by either a sendmsg or a poll. A wake up on the peer queue is then relayed to the ordinary wait queue of the client socket via wake function. The connection to the peer wait queue is again dissolved if either a wake up is about to be relayed or the client socket reconnects or a dead peer is detected or the client socket is itself closed. This enables removing the second sock_poll_wait from unix_dgram_poll, thus avoiding the use-after-free, while still ensuring that no blocked writer sleeps forever. Signed-off-by:
Rainer Weikusat <rweikusat@mobileactivedefense.com> Fixes: ec0d215f ("af_unix: fix 'poll for write'/connected DGRAM sockets") Reviewed-by:
Jason Baron <jbaron@akamai.com> Signed-off-by:
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Hannes Frederic Sowa authored
[ Upstream commit a3a116e0 ] While possibly in future we don't necessarily need to use sk_buff_head.lock this is a rather larger change, as it affects the af_unix fd garbage collector, diag and socket cleanups. This is too much for a stable patch. For the time being grab sk_buff_head.lock without disabling bh and irqs, so don't use locked skb_queue_tail. Fixes: 869e7c62 ("net: af_unix: implement stream sendpage support") Cc: Eric Dumazet <edumazet@google.com> Signed-off-by:
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Hannes Frederic Sowa authored
[ Upstream commit 8844f972 ] In case multiple writes to a unix stream socket race we could end up in a situation where we pre-allocate a new skb for use in unix_stream_sendpage but have to free it again in the locked section because another skb has been appended meanwhile, which we must use. Accidentally we didn't clear the pointer after consuming it and so we touched freed memory while appending it to the sk_receive_queue. So, clear the pointer after consuming the skb. This bug has been found with syzkaller (http://github.com/google/syzkaller) by Dmitry Vyukov. Fixes: 869e7c62 ("net: af_unix: implement stream sendpage support") Reported-by:
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Hannes Frederic Sowa authored
[ Upstream commit 73ed5d25 ] During splicing an af-unix socket to a pipe we have to drop all af-unix socket locks. While doing so we allow another reader to enter unix_stream_read_generic which can read, copy and finally free another skb. If exactly this skb is just in process of being spliced we get a use-after-free report by kasan. First, we must make sure to not have a free while the skb is used during the splice operation. We simply increment its use counter before unlocking the reader lock. Stream sockets have the nice characteristic that we don't care about zero length writes and they never reach the peer socket's queue. That said, we can take the UNIXCB.consumed field as the indicator if the skb was already freed from the socket's receive queue. If the skb was fully consumed after we locked the reader side again we know it has been dropped by a second reader. We indicate a short read to user space and abort the current splice operation. This bug has been found with syzkaller (http://github.com/google/syzkaller) by Dmitry Vyukov. Fixes: 2b514574 ("net: af_unix: implement splice for stream af_unix sockets") Reported-by:
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- 09 Dec, 2015 8 commits
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Greg Kroah-Hartman authored
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Sudip Mukherjee authored
commit 3a48d13d upstream. When building with allmodconfig the build was failing with the error: arch/tile/kernel/usb.c:70:1: warning: data definition has no type or storage class [enabled by default] arch/tile/kernel/usb.c:70:1: error: type defaults to 'int' in declaration of 'arch_initcall' [-Werror=implicit-int] arch/tile/kernel/usb.c:70:1: warning: parameter names (without types) in function declaration [enabled by default] arch/tile/kernel/usb.c:63:19: warning: 'tilegx_usb_init' defined but not used [-Wunused-function] Include linux/module.h to resolve the build failure. Signed-off-by:
Sudip Mukherjee <sudip@vectorindia.org> Signed-off-by:
Chris Metcalf <cmetcalf@ezchip.com> Signed-off-by:
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David Hildenbrand authored
commit 5967c17b upstream. We should never allow to enable/disable any facilities for the guest when other VCPUs were already created. kvm_arch_vcpu_(load|put) relies on SIMD not changing during runtime. If somebody would create and run VCPUs and then decides to enable SIMD, undefined behaviour could be possible (e.g. vector save area not being set up). Acked-by:
Christian Borntraeger <borntraeger@de.ibm.com> Acked-by:
Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by:
David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by:
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Boris Ostrovsky authored
commit b4ff8389 upstream. After commit 8c058b0b ("x86/irq: Probe for PIC presence before allocating descs for legacy IRQs") early_irq_init() will no longer preallocate descriptors for legacy interrupts if PIC does not exist, which is the case for Xen PV guests. Therefore we may need to allocate those descriptors ourselves. Signed-off-by:
Boris Ostrovsky <boris.ostrovsky@oracle.com> Suggested-by:
Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
David Vrabel <david.vrabel@citrix.com> Cc: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by:
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Arnd Bergmann authored
commit 9f088dba upstream. The recently introduced lnet_peer_set_alive() function uses get_seconds() to read the current time into a shared variable, but all other uses of that variable compare it to jiffies values. This changes the current use to jiffies as well for consistency. Signed-off-by:
Arnd Bergmann <arnd@arndb.de> Fixes: af3fa7c7 ("staging/lustre/lnet: peer aliveness status and NI status") Cc: Liang Zhen <liang.zhen@intel.com> Cc: James Simmons <uja.ornl@gmail.com> Cc: Isaac Huang <he.huang@intel.com> Signed-off-by:
Oleg Drokin <oleg.drokin@intel.com> Signed-off-by:
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Rajmohan Mani authored
commit a5964396 upstream. Existing Intel xHCI controllers require a delay of 1 mS, after setting the CMD_RESET bit in command register, before accessing any HC registers. This allows the HC to complete the reset operation and be ready for HC register access. Without this delay, the subsequent HC register access, may result in a system hang, very rarely. Verified CherryView / Braswell platforms go through over 5000 warm reboot cycles (which was not possible without this patch), without any xHCI reset hang. Signed-off-by:
Rajmohan Mani <rajmohan.mani@intel.com> Tested-by:
Joe Lawrence <joe.lawrence@stratus.com> Signed-off-by:
Mathias Nyman <mathias.nyman@linux.intel.com> Signed-off-by:
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Peter Hurley authored
commit ee0c1a65 upstream. The correct lock order is atomic_write_lock => termios_rwsem, as established by tty_write() => n_tty_write(). Fixes: c274f6ef ("tty: Hold termios_rwsem for tcflow(TCIxxx)") Reported-and-Tested-by:
Peter Hurley <peter@hurleysoftware.com> Signed-off-by:
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Peter Hurley authored
commit 6b2a3d62 upstream. The data to audit/record is in the 'from' buffer (ie., the input read buffer). Fixes: 72586c60 ("n_tty: Fix auditing support for cannonical mode") Cc: Miloslav Trmač <mitr@redhat.com> Signed-off-by:
Laura Abbott <labbott@fedoraproject.org> Signed-off-by:
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