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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1638996
Title:
apparmor's raw_data file in securityfs is sometimes truncated
Status in linux package in Ubuntu:
Incomplete
Bug description:
Hi,
It looks like sometimes apparmor's securityfs output is sometimes
truncated,
root@zesty:/sys/kernel/security/apparmor/policy/namespaces/lxd-zest_<var-lib-lxd>/profiles/usr.lib.snapd.snap-confine.1#
ls -al
total 0
drwxr-xr-x 3 root root 0 Nov 3 16:45 .
drwxr-xr-x 13 root root 0 Nov 3 16:44 ..
-r--r--r-- 1 root root 0 Nov 3 16:45 attach
-r--r--r-- 1 root root 0 Nov 3 16:45 mode
-r--r--r-- 1 root root 0 Nov 3 16:45 name
drwxr-xr-x 3 root root 0 Nov 3 16:45 profiles
-r--r--r-- 1 root root 0 Nov 3 16:45 raw_abi
-r--r--r-- 1 root root 46234 Nov 3 16:45 raw_data
-r--r--r-- 1 root root 0 Nov 3 16:45 raw_hash
-r--r--r-- 1 root root 0 Nov 3 16:45 sha1
root@zesty:/sys/kernel/security/apparmor/policy/namespaces/lxd-zest_<var-lib-lxd>/profiles/usr.lib.snapd.snap-confine.1#
cat raw_data > /tmp/out
root@zesty:/sys/kernel/security/apparmor/policy/namespaces/lxd-zest_<var-lib-lxd>/profiles/usr.lib.snapd.snap-confine.1#
ls -al /tmp/out
-rw-r--r-- 1 root root 4009 Nov 3 16:55 /tmp/out
and
2016-11-03 10:58:01 tych0 jjohansen: hi, http://paste.ubuntu.com/23421551/
2016-11-03 10:58:18 tych0 it looks like fstat is lying to me about the size
of the policy
2016-11-03 10:59:20 @jjohansen tych0: hrmm interesting, can you zip up the
/tmp/out file so I can see it looks like a complete policy file?
2016-11-03 11:00:03 @jjohansen something is definitely not right there. hrmmm
2016-11-03 11:00:26 @jjohansen the size is set by the input buffer size
2016-11-03 11:00:28 tych0 jjohansen: http://files.tycho.ws/tmp/out
2016-11-03 11:00:36 tych0 yeah, i assume
2016-11-03 11:01:15 @jjohansen my guess is something is messing up in the
seq_file walk of the policy
2016-11-03 11:02:38 @jjohansen tych0: yep the file is truncated, can you
open a bug and I will start looking for it
2016-11-03 11:03:14 tych0 jjohansen: sure, just on linux?
2016-11-03 11:03:35 @jjohansen tych0: yeah for now, just linux
2016-11-03 11:03:43 @jjohansen we can add others if needed later
2016-11-03 11:03:44 tych0 jjohansen: FWIW, somehow it seems racy, becasue
sometimes it works and sometimes it doesn't
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