This bug was fixed in the package linux - 3.13.0-66.108
---------------
linux (3.13.0-66.108) trusty; urgency=low
[ Luis Henriques ]
* Release Tracking Bug
- LP: #1503713
[ Andy Whitcroft ]
* Revert "SAUCE: aufs3: mmap: Fix races in madvise_remove() and
sys_msync()"
- LP: #1503655
[ Ben Hutchings ]
* SAUCE: aufs3: mmap: Fix races in madvise_remove() and sys_msync()
- LP: #1503655
- CVE-2015-7312
linux (3.13.0-66.107) trusty; urgency=low
[ Brad Figg ]
* Release Tracking Bug
- LP: #1503021
[ Ben Hutchings ]
* SAUCE: aufs3: mmap: Fix races in madvise_remove() and sys_msync()
- CVE-2015-7312
[ John Johansen ]
* SAUCE: (no-up) apparmor: fix mount not handling disconnected paths
- LP: #1496430
[ Upstream Kernel Changes ]
* mmc: sdhci-pci: set the clear transfer mode register quirk for O2Micro
- LP: #1472843
* mmc: sdhci: Add a quirk for AMD SDHC transfer mode register need to be
cleared for cmd without data
- LP: #1472843
* n_tty: Fix poll() when TIME_CHAR and MIN_CHAR == 0
- LP: #1397976
* net: make skb_gso_segment error handling more robust
- LP: #1497048
* net: gso: use feature flag argument in all protocol gso handlers
- LP: #1497048
* md/raid10: always set reshape_safe when initializing reshape_position.
- LP: #1500810
* md: flush ->event_work before stopping array.
- LP: #1500810
* ipv6: addrconf: validate new MTU before applying it
- LP: #1500810
* virtio-net: drop NETIF_F_FRAGLIST
- LP: #1500810
* RDS: verify the underlying transport exists before creating a
connection
- LP: #1500810
* xen/gntdev: convert priv->lock to a mutex
- LP: #1500810
* xen/gntdevt: Fix race condition in gntdev_release()
- LP: #1500810
* PCI: Restore PCI_MSIX_FLAGS_BIRMASK definition
- LP: #1500810
* nfsd: Drop BUG_ON and ignore SECLABEL on absent filesystem
- LP: #1500810
* crypto: ixp4xx - Remove bogus BUG_ON on scattered dst buffer
- LP: #1500810
* xen-blkfront: don't add indirect pages to list when !feature_persistent
- LP: #1500810
* xen-blkback: replace work_pending with work_busy in
purge_persistent_gnt()
- LP: #1500810
* USB: sierra: add 1199:68AB device ID
- LP: #1500810
* regmap: regcache-rbtree: Clean new present bits on present bitmap
resize
- LP: #1500810
* target/iscsi: Fix double free of a TUR followed by a solicited NOPOUT
- LP: #1500810
* rbd: fix copyup completion race
- LP: #1500810
* md/raid1: extend spinlock to protect raid1_end_read_request against
inconsistencies
- LP: #1500810
* target: REPORT LUNS should return LUN 0 even for dynamic ACLs
- LP: #1500810
* MIPS: Fix sched_getaffinity with MT FPAFF enabled
- LP: #1500810
* xhci: fix off by one error in TRB DMA address boundary check
- LP: #1500810
* perf: Fix fasync handling on inherited events
- LP: #1500810
* mm, vmscan: Do not wait for page writeback for GFP_NOFS allocations
- LP: #1500810
* MIPS: Make set_pte() SMP safe.
- LP: #1500810
* ipc: modify message queue accounting to not take kernel data structures
into account
- LP: #1500810
* ocfs2: fix BUG in ocfs2_downconvert_thread_do_work()
- LP: #1500810
* fsnotify: fix oops in fsnotify_clear_marks_by_group_flags()
- LP: #1500810
* KVM: x86: Use adjustment in guest cycles when handling
MSR_IA32_TSC_ADJUST
- LP: #1500810
* localmodconfig: Use Kbuild files too
- LP: #1500810
* dm thin metadata: delete btrees when releasing metadata snapshot
- LP: #1500810
* dm btree: add ref counting ops for the leaves of top level btrees
- LP: #1500810
* drm/radeon: add new OLAND pci id
- LP: #1500810
* libiscsi: Fix host busy blocking during connection teardown
- LP: #1500810
* libfc: Fix fc_exch_recv_req() error path
- LP: #1500810
* libfc: Fix fc_fcp_cleanup_each_cmd()
- LP: #1500810
* EDAC, ppc4xx: Access mci->csrows array elements properly
- LP: #1500810
* crypto: caam - fix memory corruption in ahash_final_ctx
- LP: #1500810
* mm/hwpoison: fix page refcount of unknown non LRU page
- LP: #1500810
* ipc,sem: fix use after free on IPC_RMID after a task using same
semaphore set exits
- LP: #1500810
* ipc/sem.c: change memory barrier in sem_lock() to smp_rmb()
- LP: #1500810
* ipc/sem.c: update/correct memory barriers
- LP: #1500810
* Add factory recertified Crucial M500s to blacklist
- LP: #1500810
* arm64: KVM: Fix host crash when injecting a fault into a 32bit guest
- LP: #1500810
* batman-adv: protect tt_local_entry from concurrent delete events
- LP: #1500810
* ip6_gre: release cached dst on tunnel removal
- LP: #1500810
* net: Fix RCU splat in af_key
- LP: #1500810
* rds: fix an integer overflow test in rds_info_getsockopt()
- LP: #1500810
* udp: fix dst races with multicast early demux
- LP: #1500810
* sparc64: Fix userspace FPU register corruptions.
- LP: #1500810
* ipv6: lock socket in ip6_datagram_connect()
- LP: #1500810
* rtnetlink: verify IFLA_VF_INFO attributes before passing them to driver
- LP: #1500810
* net/tipc: initialize security state for new connection socket
- LP: #1500810
* net: pktgen: fix race between pktgen_thread_worker() and kthread_stop()
- LP: #1500810
* net: call rcu_read_lock early in process_backlog
- LP: #1500810
* net: Fix skb csum races when peeking
- LP: #1500810
* netlink: don't hold mutex in rcu callback when releasing mmapd ring
- LP: #1500810
* Linux 3.13.11-ckt27
- LP: #1500810
-- Luis Henriques <luis.henriq...@canonical.com> Wed, 07 Oct 2015
14:29:57 +0100
** Changed in: linux (Ubuntu Trusty)
Status: Fix Committed => Fix Released
** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2015-7312
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https://bugs.launchpad.net/bugs/1497048
Title:
Trusty - Null pointer dereference at queue_userspace_packet+0x1f/0x2d0
[openvswitch]
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Trusty:
Fix Released
Bug description:
[Impact]
* With certain complicated network configurations as occur in
Openstack clouds the kernel crashes with the below stack trace.
* We have observed kernel panics when an openvswitch bridge is
populated with virtual devices (veth, for example) that have expansive
feature sets that include NETIF_F_GSO_GRE.
The failure occurs when foreign GRE encapsulated traffic
(explicitly not including the initial packets of a connection) arrives at
the system (likely via a switch flood event). The packets are GRO
accumulated, and passed to the OVS receive processing. As the connection
is not in the OVS kernel datapath table, the call path is:
ovs_dp_upcall ->
queue_gso_packets ->
__skb_gso_segment(skb, NETIF_F_SG, false)
Without 1e16aa3ddf863c6b9f37eddf52503230a62dedb3, __skb_gso_segment
returns NULL,as the features from the device (including _GSO_GRE) are
used in place of the _SG feature supplied to the call. The kernel
panics on a subsequent dereference of the NULL pointer in
queue_userspace_packet().
[Test Case]
* We have no easy reproduce procedure.
[Regression Potential]
* Both patches are pulled from upstream, but not accepted nor rejected as
stable patches.
Stable threads
http://marc.info/?l=linux-netdev&m=143631594021618&w=2
http://marc.info/?l=linux-netdev&m=143951671004053&w=2
* This patch has been in place in a large cloud where the issue used
to occur frequently now for 50 days without related incident.
[Other Info]
* 330966e501ffe282d7184fde4518d5e0c24bc7f8 is included as well, as it
obviously avoids possible NULL dereferences in similar areas of code. As such
we'd like to see both patches included.
________________________________________________________________________[415165.417433]
BUG: unable to handle kernel NULL pointer dereference at 00000000000000a3
[415165.417759] IP: [<ffffffffa015e24f>] queue_userspace_packet+0x1f/0x2d0
[openvswitch]
[415165.418073] PGD 0
[415165.418161] Oops: 0000 [#1] SMP
[415165.418299] Modules linked in: l2tp_eth l2tp_netlink l2tp_core vhost_net
vhost macvtap macvlan xt_conntrack ipt_REJECT dccp_diag dccp tcp_diag udp_diag
inet_diag unix_diag veth xt_CHECKSUM iptable_mangle ipt_MASQUERADE iptable_nat
nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp
ip6table_filter ip6_tables iptable_filter ip_tables x_tables nbd ib_iser
rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp
libiscsi scsi_transport_iscsi openvswitch gre vxlan ip_tunnel dm_crypt gpio_ich
dm_multipath bridge scsi_dh stp llc intel_rapl x86_pkg_temp_thermal
intel_powerclamp coretemp kvm_intel joydev kvm shpchp sb_edac ipmi_si edac_core
acpi_power_meter lpc_ich mac_hid xfs btrfs xor raid6_pq libcrc32c ses enclosure
hid_generic crct10dif_pclmul crc32_pclmul ghash_clmulni_intel
[415165.421570] aesni_intel ixgbe igb aes_x86_64 lrw dca gf128mul
glue_helper ptp ablk_helper usbhid cryptd megaraid_sas pps_core hid mdio
i2c_algo_bit wmi
[415165.427942] CPU: 7 PID: 0 Comm: swapper/7 Not tainted 3.13.0-53-generic
#89-Ubuntu
[415165.440183] Hardware name: Cisco Systems Inc UCSC-C240-M3S/UCSC-C240-M3S,
BIOS C240M3.2.0.1a.0.042820140036 04/28/2014
[415165.452693] task: ffff882012d01800 ti: ffff882012cfc000 task.ti:
ffff882012cfc000
[415165.465847] RIP: 0010:[<ffffffffa015e24f>] [<ffffffffa015e24f>]
queue_userspace_packet+0x1f/0x2d0 [openvswitch]
[415165.480003] RSP: 0018:ffff88203fce3b88 EFLAGS: 00010296
[415165.487411] RAX: 0000000000000000 RBX: ffff88203fce3ce8 RCX:
ffff88203fce3ce8
[415165.502430] RDX: 0000000000000000 RSI: 000000000000000e RDI:
ffffffff81cdab00
[415165.517448] RBP: ffff88203fce3bc8 R08: 0000000000000001 R09:
0000000000000000
[415165.532701] R10: 0000000000410000 R11: 000000000f9365e3 R12:
ffff88203fce3ce8
[415165.548698] R13: 0000000000000000 R14: 0000000000000000 R15:
000000000000000e
[415165.564653] FS: 0000000000000000(0000) GS:ffff88203fce0000(0000)
knlGS:0000000000000000
[415165.580681] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[415165.588725] CR2: 00000000000000a3 CR3: 0000000001c0e000 CR4:
00000000000427e0
[415165.604495] Stack:
[415165.612127] ffffffff81d1ca68 ffff881fbd6c6c00 0000000000000009
0000000000000000
[415165.627360] ffff88203fce3ce8 0000000000000000 000000000000000e
0000000000000000
[415165.642642] ffff88203fce3cb8 ffffffffa015e5a1 0000000000000010
ffffffff81cdab00
[415165.657955] Call Trace:
[415165.665405] <IRQ>
[415165.665500]
[415165.672684] [<ffffffffa015e5a1>] queue_gso_packets+0xa1/0x1f0
[openvswitch]
[415165.680015] [<ffffffffa015de7b>] ? ovs_execute_actions+0x2b/0x30
[openvswitch]
[415165.694425] [<ffffffffa01607f5>] ovs_dp_upcall+0xe5/0xf0 [openvswitch]
[415165.701807] [<ffffffffa016090f>]
ovs_dp_process_received_packet+0x10f/0x120 [openvswitch]
[415165.716228] [<ffffffffa0166aca>] ovs_vport_receive+0x2a/0x30
[openvswitch]
[415165.723591] [<ffffffffa0167391>] netdev_frame_hook+0xc1/0x120
[openvswitch]
[415165.730799] [<ffffffff81626892>] __netif_receive_skb_core+0x262/0x840
[415165.737909] [<ffffffff81626e88>] __netif_receive_skb+0x18/0x60
[415165.744824] [<ffffffff81627a1e>] process_backlog+0xae/0x1a0
[415165.751644] [<ffffffff81627272>] net_rx_action+0x152/0x250
[415165.758248] [<ffffffff8106cc6c>] __do_softirq+0xec/0x2c0
[415165.764694] [<ffffffff8106d1b5>] irq_exit+0x105/0x110
[415165.770968] [<ffffffff81735c26>] do_IRQ+0x56/0xc0
[415165.777058] [<ffffffff8172b32d>] common_interrupt+0x6d/0x6d
[415165.783041] <EOI>
[415165.783127]
[415165.788840] [<ffffffff815d523f>] ? cpuidle_enter_state+0x4f/0xc0
[415165.794659] [<ffffffff815d5369>] cpuidle_idle_call+0xb9/0x1f0
[415165.800468] [<ffffffff8101d34e>] arch_cpu_idle+0xe/0x30
[415165.806126] [<ffffffff810bf0a5>] cpu_startup_entry+0xc5/0x290
[415165.811862] [<ffffffff810414dd>] start_secondary+0x21d/0x2d0
[415165.817479] Code: 32 74 04 48 89 71 08 5b 5d c3 66 90 66 66 66 66 90 55
48 89 e5 41 57 41 89 f7 41 56 49 89 d6 41 55 41 54 53 48 89 cb 48 83 ec 18 <f6>
82 a3 00 00 00 10 48 89 7d c8 48 c7 45 d0 00 00 00 00 0f 85
[415165.834611] RIP [<ffffffffa015e24f>] queue_userspace_packet+0x1f/0x2d0
[openvswitch]
[415165.845643] RSP <ffff88203fce3b88>
[415165.851171] CR2: 00000000000000a3
_________________________________________________________________________________________
After analysis we provided a 3.13 kernel patched with commit
1e16aa3ddf863c6b9f37eddf52503230a62dedb3 and
330966e501ffe282d7184fde4518d5e0c24bc7f8. As a result the fairly consistent
crash is no longer occuring.
We attempted to push the patch through the stable process here
http://marc.info/?l=linux-netdev&m=143631594021618&w=2
and again
http://marc.info/?l=linux-netdev&m=143951671004053&w=2
Unfortunately upstream stable has yet to accept these upstream.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1497048/+subscriptions
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