** Also affects: linux (Ubuntu Yakkety)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1648903
Title:
Permission denied and inconsistent behavior in complain mode with 'ip
netns list' command
Status in AppArmor:
New
Status in linux package in Ubuntu:
Incomplete
Status in linux source package in Xenial:
Fix Committed
Status in linux source package in Yakkety:
Fix Committed
Bug description:
On 16.04 with Ubuntu 4.4.0-53.74-generic 4.4.30
With this profile:
#include <tunables/global>
profile test (attach_disconnected,complain) {
#include <abstractions/base>
/{,usr/}{,s}bin/ip ixr, # COMMENT OUT THIS RULE TO SEE WEIRDNESS
capability sys_admin,
capability net_admin,
capability sys_ptrace,
network netlink raw,
ptrace (trace),
/ r,
/run/netns/ rw,
/run/netns/* rw,
mount options=(rw, rshared) -> /run/netns/,
mount options=(rw, bind) /run/netns/ -> /run/netns/,
mount options=(rw, bind) / -> /run/netns/*,
mount options=(rw, rslave) /,
mount options=(rw, rslave), # LP: #1648245
umount /sys/,
umount /,
/bin/dash ixr,
}
Everything is fine when I do:
$ sudo apparmor_parser -r /home/jamie/apparmor.profile && sudo aa-exec -p
test -- sh -c 'ip netns list'
$
and there are no ALLOWED entries in syslog.
However, if I comment out the '/{,usr/}{,s}bin/ip ixr,' rule, I get a
permission denied and a bunch of ALLOWED entries:
$ sudo apparmor_parser -r /home/jamie/apparmor.profile && sudo aa-exec -p
test -- sh -c 'ip netns list'
open("/proc/self/ns/net"): Permission denied
Dec 9 17:08:09 sec-xenial-amd64 kernel: [ 3117.862629] audit: type=1400
audit(1481324889.782:469): apparmor="STATUS" operation="profile_replace"
profile="unconfined" name="test" pid=4314 comm="apparmor_parser"
Dec 9 17:08:09 sec-xenial-amd64 kernel: [ 3117.870339] audit: type=1400
audit(1481324889.790:470): apparmor="ALLOWED" operation="exec" profile="test"
name="/bin/ip" pid=4317 comm="sh" requested_mask="x" denied_mask="x" fsuid=0
ouid=0 target="test//null-/bin/ip"
Dec 9 17:08:09 sec-xenial-amd64 kernel: [ 3117.870559] audit: type=1400
audit(1481324889.790:471): apparmor="ALLOWED" operation="open"
profile="test//null-/bin/ip" name="/etc/ld.so.cache" pid=4317 comm="ip"
requested_mask="r" denied_mask="r" fsuid=0 ouid=0
Dec 9 17:08:09 sec-xenial-amd64 kernel: [ 3117.870628] audit: type=1400
audit(1481324889.790:472): apparmor="ALLOWED" operation="open"
profile="test//null-/bin/ip" name="/lib/x86_64-linux-gnu/libdl-2.23.so"
pid=4317 comm="ip" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
Dec 9 17:08:09 sec-xenial-amd64 kernel: [ 3117.870703] audit: type=1400
audit(1481324889.790:473): apparmor="ALLOWED" operation="open"
profile="test//null-/bin/ip" name="/lib/x86_64-linux-gnu/libc-2.23.so" pid=4317
comm="ip" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
Dec 9 17:08:09 sec-xenial-amd64 kernel: [ 3117.870861] audit: type=1400
audit(1481324889.790:474): apparmor="ALLOWED" operation="file_mprotect"
profile="test//null-/bin/ip" name="/bin/ip" pid=4317 comm="ip"
requested_mask="r" denied_mask="r" fsuid=0 ouid=0
Dec 9 17:08:09 sec-xenial-amd64 kernel: [ 3117.870913] audit: type=1400
audit(1481324889.790:475): apparmor="ALLOWED" operation="file_mprotect"
profile="test//null-/bin/ip" name="/lib/x86_64-linux-gnu/ld-2.23.so" pid=4317
comm="ip" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
Dec 9 17:08:09 sec-xenial-amd64 kernel: [ 3117.871019] audit: type=1400
audit(1481324889.790:476): apparmor="ALLOWED" operation="create"
profile="test//null-/bin/ip" pid=4317 comm="ip" family="netlink"
sock_type="raw" protocol=0 requested_mask="create" denied_mask="create"
Dec 9 17:08:09 sec-xenial-amd64 kernel: [ 3117.871066] audit: type=1400
audit(1481324889.790:477): apparmor="ALLOWED" operation="setsockopt"
profile="test//null-/bin/ip" pid=4317 comm="ip" family="netlink"
sock_type="raw" protocol=0 requested_mask="setopt" denied_mask="setopt"
Dec 9 17:08:09 sec-xenial-amd64 kernel: [ 3117.871099] audit: type=1400
audit(1481324889.790:478): apparmor="ALLOWED" operation="setsockopt"
profile="test//null-/bin/ip" pid=4317 comm="ip" family="netlink"
sock_type="raw" protocol=0 requested_mask="setopt" denied_mask="setopt"
Dec 9 17:08:09 sec-xenial-amd64 kernel: [ 3117.871128] audit: type=1400
audit(1481324889.790:479): apparmor="ALLOWED" operation="bind"
profile="test//null-/bin/ip" pid=4317 comm="ip" family="netlink"
sock_type="raw" protocol=0 requested_mask="bind" denied_mask="bind"
Dec 9 17:08:09 sec-xenial-amd64 kernel: [ 3117.871672] audit: type=1400
audit(1481324889.794:480): apparmor="ALLOWED" operation="getsockname"
profile="test//null-/bin/ip" pid=4317 comm="ip" family="netlink"
sock_type="raw" protocol=0 requested_mask="getattr" denied_mask="getattr"
Dec 9 17:08:09 sec-xenial-amd64 kernel: [ 3117.871770] audit: type=1400
audit(1481324889.794:481): apparmor="ALLOWED" operation="open" info="Failed
name lookup - disconnected path" error=-13 profile="test//null-/bin/ip" name=""
pid=4317 comm="ip" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
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