This bug was fixed in the package linux - 4.2.0-38.45
---------------
linux (4.2.0-38.45) wily; urgency=low
[ Kamal Mostafa ]
* CVE-2016-1583 (LP: #1588871)
- ecryptfs: fix handling of directory opening
- SAUCE: proc: prevent stacking filesystems on top
- SAUCE: ecryptfs: forbid opening files without mmap handler
- SAUCE: sched: panic on corrupted stack end
-- Andy Whitcroft <a...@canonical.com> Wed, 08 Jun 2016 22:10:39 +0100
** Changed in: linux (Ubuntu Xenial)
Status: Fix Committed => Fix Released
--
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https://bugs.launchpad.net/bugs/1572316
Title:
oops when propagating mounts into containers - RIP:
0010:[<ffffffff8123cb3e>] [<ffffffff8123cb3e>]
propagate_one+0xbe/0x1c0
Status in linux package in Ubuntu:
Fix Released
Status in linux-lts-utopic package in Ubuntu:
Invalid
Status in linux source package in Trusty:
Fix Released
Status in linux-lts-utopic source package in Trusty:
Fix Released
Status in linux source package in Vivid:
Fix Released
Status in linux-lts-utopic source package in Vivid:
Invalid
Status in linux source package in Wily:
Fix Released
Status in linux-lts-utopic source package in Wily:
Invalid
Status in linux source package in Xenial:
Fix Released
Status in linux-lts-utopic source package in Xenial:
Invalid
Status in linux source package in Yakkety:
Fix Released
Status in linux-lts-utopic source package in Yakkety:
Invalid
Bug description:
SRU Justification:
Impact: Propagation to some mount tree configurations can cause the
kernel to oops. This is trivially reproducible using lxd.
Fix: Upstream cherry pick.
Regression Potential: Both Eric and I have tested the fix and believe
that the post-fix code will handle all cases the same as before except
for the ones which weren't being handled correctly. I believe the
regression potential is small.
---
If I use LXD on xenial with a configuration that does something like:
(/nfs in my case is an nfs mount, but based on the kernel code in
question anything is probably okay):
devices:
bind:
type: disk
source: /nfs
path: /nfs
recursive: "true"
and then start the container and on the host, do a new mount:
sudo mount $ipaddr:/some/nfs/path /nfs/newpath
You get the following kernel oops:
Apr 11 21:59:36 stock2 kernel: [ 1648.993034] Oops: 0000 [#1] SMP
Apr 11 21:59:36 stock2 kernel: [ 1648.993415] Modules linked in: binfmt_misc
veth rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace fscache xt_CHECKSUM
iptable_mangle xt_tcpudp ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat
nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack bridge stp llc
iptable_filter ip_tables x_tables zfs(PO) zunicode(PO) zcommon(PO) znvpair(PO)
spl(O) zavl(PO) ppdev kvm_intel parport_pc joydev kvm input_leds mac_hid
irqbypass parport i2c_piix4 8250_fintek serio_raw ib_iser rdma_cm iw_cm ib_cm
ib_sa ib_mad ib_core ib_addr sunrpc iscsi_tcp libiscsi_tcp libiscsi
scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov
async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0
multipath linear cirrus ttm drm_kms_helper syscopyarea sysfillrect sysimgblt
psmouse fb_sys_fops floppy drm pata_acpi
Apr 11 21:59:36 stock2 kernel: [ 1649.002015] CPU: 2 PID: 9449 Comm:
mount.nfs Tainted: P O 4.4.0-18-generic #34+tych0201604111025
Apr 11 21:59:36 stock2 kernel: [ 1649.003037] Hardware name: QEMU Standard PC
(i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
Apr 11 21:59:36 stock2 kernel: [ 1649.004042] task: ffff880074c1a580 ti:
ffff880067d30000 task.ti: ffff880067d30000
Apr 11 21:59:36 stock2 kernel: [ 1649.004810] RIP: 0010:[<ffffffff8123cb3e>]
[<ffffffff8123cb3e>] propagate_one+0xbe/0x1c0
Apr 11 21:59:36 stock2 kernel: [ 1649.005654] RSP: 0018:ffff880067d33d68
EFLAGS: 00010297
Apr 11 21:59:36 stock2 kernel: [ 1649.006211] RAX: ffff88003bb4ca80 RBX:
ffff880074ad8300 RCX: ffff880074503500
Apr 11 21:59:36 stock2 kernel: [ 1649.006934] RDX: 0000000000000000 RSI:
000000000000019c RDI: 0000000000000000
Apr 11 21:59:36 stock2 kernel: [ 1649.007656] RBP: ffff880067d33d78 R08:
ffff8800363bad80 R09: ffffffff813eac5c
Apr 11 21:59:36 stock2 kernel: [ 1649.008390] R10: ffffea00002b5800 R11:
0000000000018711 R12: ffff8800363ba600
Apr 11 21:59:36 stock2 kernel: [ 1649.009111] R13: ffff880067d33dc0 R14:
ffff880074ad8300 R15: 0000000000000000
Apr 11 21:59:36 stock2 kernel: [ 1649.009835] FS: 00007f653eac4880(0000)
GS:ffff88007cd00000(0000) knlGS:0000000000000000
Apr 11 21:59:36 stock2 kernel: [ 1649.010642] CS: 0010 DS: 0000 ES: 0000
CR0: 000000008005003b
Apr 11 21:59:36 stock2 kernel: [ 1649.011237] CR2: 0000000000000010 CR3:
0000000077a4e000 CR4: 00000000000006e0
Apr 11 21:59:36 stock2 kernel: [ 1649.011984] Stack:
Apr 11 21:59:36 stock2 kernel: [ 1649.012255] ffff880074ad8300
ffff8800363ba600 ffff880067d33db0 ffffffff8123d060
Apr 11 21:59:36 stock2 kernel: [ 1649.013070] ffff88003bb4ca80
ffff8800363ba600 ffff88000c211980 0000000000000000
Apr 11 21:59:36 stock2 kernel: [ 1649.013892] ffff880067d33e98
ffff880067d33df8 ffffffff8122dd97 ffff88003bb4c900
Apr 11 21:59:36 stock2 kernel: [ 1649.014751] Call Trace:
Apr 11 21:59:36 stock2 kernel: [ 1649.015053] [<ffffffff8123d060>]
propagate_mnt+0x120/0x150
Apr 11 21:59:36 stock2 kernel: [ 1649.015643] [<ffffffff8122dd97>]
attach_recursive_mnt+0x147/0x230
Apr 11 21:59:36 stock2 kernel: [ 1649.016286] [<ffffffff8122ded8>]
graft_tree+0x58/0x90
Apr 11 21:59:36 stock2 kernel: [ 1649.016809] [<ffffffff8122df9e>]
do_add_mount+0x8e/0xd0
Apr 11 21:59:36 stock2 kernel: [ 1649.017342] [<ffffffff8122ed70>]
do_mount+0x2c0/0xe00
Apr 11 21:59:36 stock2 kernel: [ 1649.017863] [<ffffffff8122e924>] ?
copy_mount_options+0xb4/0x220
Apr 11 21:59:36 stock2 kernel: [ 1649.018466] [<ffffffff8122fbdf>]
SyS_mount+0x9f/0x100
Apr 11 21:59:36 stock2 kernel: [ 1649.018996] [<ffffffff818243b2>]
entry_SYSCALL_64_fastpath+0x16/0x71
Apr 11 21:59:36 stock2 kernel: [ 1649.019631] Code: 39 90 d8 00 00 00 75 ec
8b b0 10 01 00 00 48 89 3d 80 e1 f8 00 48 89 05 81 e1 f8 00 39 b1 10 01 00 00
74 19 48 8b bf d8 00 00 00 <48> 8b 47 10 48 89 3d 5f e1 f8 00 48 89 05 60 e1 f8
00 8b 43 30
Apr 11 21:59:36 stock2 kernel: [ 1649.022395] RIP [<ffffffff8123cb3e>]
propagate_one+0xbe/0x1c0
Apr 11 21:59:36 stock2 kernel: [ 1649.022990] RSP <ffff880067d33d68>
Apr 11 21:59:36 stock2 kernel: [ 1649.023362] CR2: 0000000000000010
Apr 11 21:59:36 stock2 kernel: [ 1649.027053] ---[ end trace 46ce79a38cba28a5
]---
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