Public bug reported:
When an fd is disallowed from being inherited during exec, instead of
closed it is duped to a special apparmor/.null file. This prevents the
fd from being reused by another file in case the application expects
the original file on a give fd (eg stdin/stdout etc). This results in
a denial message like
[32375.561535] audit: type=1400 audit(1478825963.441:358): apparmor="DENIED" op\
eration="file_inherit" namespace="root//lxd-t_<var-lib-lxd>" profile="/sbin/dhc\
lient" name="/dev/pts/1" pid=16795 comm="dhclient" requested_mask="wr" denied_m\
ask="wr" fsuid=165536 ouid=165536
Further access to the fd is resultin in the rather useless denial message
of
[32375.566820] audit: type=1400 audit(1478825963.445:359): apparmor="DENIED" op\
eration="file_perm" namespace="root//lxd-t_<var-lib-lxd>" profile="/sbin/dhclie\
nt" name="/apparmor/.null" pid=16795 comm="dhclient" requested_mask="w" denied_\
mask="w" fsuid=165536 ouid=0
since we have the original denial, the noisy and useless .null based
denials can be skipped.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: Incomplete
** Affects: linux (Ubuntu Yakkety)
Importance: Undecided
Status: Incomplete
** Affects: linux (Ubuntu Zesty)
Importance: Undecided
Status: Incomplete
** Also affects: linux (Ubuntu Zesty)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Yakkety)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1660836
Title:
apparmor auditing denied access of special apparmor .null fi\ le
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