Public bug reported:
Attempting on a mako device to setfattr on a file with the security
namespace fails with EOPNOTSUPP:
$ sudo setfattr -h -n security.sdtest -v hello testfile
setfattr: testfile: Operation not supported
but the 'trusted' and 'user' namespaces work properly:
$ sudo setfattr -h -n user.sdtest -v hello testfile
$ sudo getfattr -h -n user.sdtest testfile
# file: testfile
user.sdtest="hello"
strace'ing the setfaddr command shows the following:
lsetxattr("testfile", "security.sdtest", "hello", 5, 0) = -1
EOPNOTSUPP (Operation not supported)
This is not the case for other kernels based off an android kernel. e.g.
it works fine on a grouper device.
$ uname -a
Linux ubuntu-phablet 3.4.0-5-mako #26-Ubuntu SMP PREEMPT Tue Feb 25 19:23:05
UTC 2014 armv7l armv7l armv7l GNU/Linux
Steps to reproduce:
$ dd if=/dev/zero of=test.img bs=4096 count=4096
4096+0 records in
4096+0 records out
16777216 bytes (17 MB) copied, 0.181383 s, 92.5 MB/s
$ mkfs.ext3 -q -F test.img
$ mkdir mountpoint
$ sudo mount -o loop,user_xattr test.img mountpoint
[sudo] password for phablet:
$ mount | grep mountpoint
/home/phablet/test.img on /home/phablet/mountpoint type ext3
(rw,relatime,errors=continue,user_xattr,barrier=1,data=writeback)
$ cd mountpoint/
$ sudo touch testfile
$ sudo setfattr -h -n security.sdtest -v hello testfile # this command
fails on mako, not on grouper
setfattr: testfile: Operation not supported
$ sudo setfattr -h -n trusted.sdtest -v hello testfile
$ sudo getfattr -h -n trusted.sdtest testfile
# file: testfile
trusted.sdtest="hello"
It fails regardless of whether the filesystem is ext3 or ext4.
(There are apparmor tests that exercise this functionality, which is how
it was noticed.)
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
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https://bugs.launchpad.net/bugs/1295948
Title:
mako kernel doesn't support xattrs in the security namespace
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