** Also affects: linux (Ubuntu Utopic)
Importance: Undecided
Assignee: John Johansen (jjohansen)
Status: Confirmed
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https://bugs.launchpad.net/bugs/1308761
Title:
apparmor spams log with warning message
Status in “linux” package in Ubuntu:
Confirmed
Status in “linux” source package in Trusty:
Confirmed
Status in “linux” source package in Utopic:
Confirmed
Bug description:
The apparmor kernel module will spam the dmesg log with a stack trace
and warning when the label on a unix socket does not match the label
on the task sending the message.
This happens when a socket is delegated to another task
Example Message in the log
Apr 5 05:16:45 cormac kernel: [66784.479777] ------------[ cut here
]------------
Apr 5 05:16:45 cormac kernel: [66784.479791] WARNING: CPU: 0 PID: 21866 at
/build/buildd/linux-3.13.0/security/apparmor/lsm.c:839
apparmor_unix_may_send+0x16c/0x180()
Apr 5 05:16:45 cormac kernel: [66784.479793] AppArmor WARN
apparmor_unix_may_send: ((!aa_label_is_subset(cxt->label, label))):
Apr 5 05:16:45 cormac kernel: [66784.479794] Modules linked in: xt_hl
ipt_REJECT xt_comment xt_limit xt_tcpudp xt_addrtype ppdev nf_conntrack_ipv4
nf_defrag_ipv4 xt_conntrack nf_conntrack_netbios_ns nf_conntrack_broadcast
nf_nat_ftp nf_nat nf_conntrack_ftp iptable_filter ip_tables kvm_intel kvm
cirrus psmouse serio_raw ip6t_REJECT xt_LOG ttm ip6t_rt nf_conntrack_ipv6
nf_defrag_ipv6 nf_conntrack parport_pc ip6table_filter ip6_tables x_tables
drm_kms_helper drm lp parport mac_hid syscopyarea sysfillrect sysimgblt
i2c_piix4 floppy
Apr 5 05:16:45 cormac kernel: [66784.479828] CPU: 0 PID: 21866 Comm: sshd
Tainted: G W 3.13.0-22-generic #44-Ubuntu
Apr 5 05:16:45 cormac kernel: [66784.479829] Hardware name: Bochs Bochs,
BIOS Bochs 01/01/2011
Apr 5 05:16:45 cormac kernel: [66784.479832] 0000000000000009
ffff8800d5d25bd0 ffffffff81714914 ffff8800d5d25c18
Apr 5 05:16:45 cormac kernel: [66784.479834] ffff8800d5d25c08
ffffffff810676bd ffff8800d67a3c30 ffff880138147b80
Apr 5 05:16:45 cormac kernel: [66784.479836] ffff88003681cb40
ffff880138147680 ffff8801384217f0 ffff8800d5d25c68
Apr 5 05:16:45 cormac kernel: [66784.479839] Call Trace:
Apr 5 05:16:45 cormac kernel: [66784.479846] [<ffffffff81714914>]
dump_stack+0x45/0x56
Apr 5 05:16:45 cormac kernel: [66784.479851] [<ffffffff810676bd>]
warn_slowpath_common+0x7d/0xa0
Apr 5 05:16:45 cormac kernel: [66784.479853] [<ffffffff8106772c>]
warn_slowpath_fmt+0x4c/0x50
Apr 5 05:16:45 cormac kernel: [66784.479855] [<ffffffff8130e92c>]
apparmor_unix_may_send+0x16c/0x180
Apr 5 05:16:45 cormac kernel: [66784.479859] [<ffffffff812cf446>]
security_unix_may_send+0x16/0x20
Apr 5 05:16:45 cormac kernel: [66784.479863] [<ffffffff816b1435>]
unix_dgram_sendmsg+0x2a5/0x620
Apr 5 05:16:45 cormac kernel: [66784.479868] [<ffffffff81601f3b>]
sock_sendmsg+0x8b/0xc0
Apr 5 05:16:45 cormac kernel: [66784.479872] [<ffffffff8104f28f>] ?
kvm_clock_read+0x1f/0x30
Apr 5 05:16:45 cormac kernel: [66784.479875] [<ffffffff816020e1>]
SYSC_sendto+0x121/0x1c0
Apr 5 05:16:45 cormac kernel: [66784.479901] [<ffffffff8109dd74>] ?
vtime_account_user+0x54/0x60
Apr 5 05:16:45 cormac kernel: [66784.479907] [<ffffffff81020d35>] ?
syscall_trace_enter+0x145/0x250
Apr 5 05:16:45 cormac kernel: [66784.479909] [<ffffffff81602bee>]
SyS_sendto+0xe/0x10
Apr 5 05:16:45 cormac kernel: [66784.479913] [<ffffffff817254ff>]
tracesys+0xe1/0xe6
Apr 5 05:16:45 cormac kernel: [66784.479915] ---[ end trace c4dfb167bafcc341
]---
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