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  1. 15 1月, 2013 1 次提交
    • P
      tun: fix LSM/SELinux labeling of tun/tap devices · 5dbbaf2d
      由 Paul Moore 提交于 
      This patch corrects some problems with LSM/SELinux that were introduced
with the multiqueue patchset.  The problem stems from the fact that the
multiqueue work changed the relationship between the tun device and its
associated socket; before the socket persisted for the life of the
device, however after the multiqueue changes the socket only persisted
for the life of the userspace connection (fd open).  For non-persistent
devices this is not an issue, but for persistent devices this can cause
the tun device to lose its SELinux label.

We correct this problem by adding an opaque LSM security blob to the
tun device struct which allows us to have the LSM security state, e.g.
SELinux labeling information, persist for the lifetime of the tun
device.  In the process we tweak the LSM hooks to work with this new
approach to TUN device/socket labeling and introduce a new LSM hook,
security_tun_dev_attach_queue(), to approve requests to attach to a
TUN queue via TUNSETQUEUE.

The SELinux code has been adjusted to match the new LSM hooks, the
other LSMs do not make use of the LSM TUN controls.  This patch makes
use of the recently added "tun_socket:attach_queue" permission to
restrict access to the TUNSETQUEUE operation.  On older SELinux
policies which do not define the "tun_socket:attach_queue" permission
the access control decision for TUNSETQUEUE will be handled according
to the SELinux policy's unknown permission setting.
Signed-off-by: NPaul Moore <pmoore@redhat.com>
Acked-by: NEric Paris <eparis@parisplace.org>
Tested-by: NJason Wang <jasowang@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      5dbbaf2d
  3. 14 12月, 2012 1 次提交
  5. 12 10月, 2012 1 次提交
  7. 21 9月, 2012 1 次提交
  9. 01 6月, 2012 1 次提交
  11. 10 4月, 2012 1 次提交
  13. 10 2月, 2012 1 次提交
  15. 07 1月, 2012 1 次提交
  17. 06 1月, 2012 1 次提交
  19. 04 1月, 2012 6 次提交
  21. 20 7月, 2011 1 次提交
  23. 25 4月, 2011 1 次提交
    • A
      SECURITY: Move exec_permission RCU checks into security modules · 1c990429
      由 Andi Kleen 提交于 
      Right now all RCU walks fall back to reference walk when CONFIG_SECURITY
is enabled, even though just the standard capability module is active.
This is because security_inode_exec_permission unconditionally fails
RCU walks.

Move this decision to the low level security module. This requires
passing the RCU flags down the security hook. This way at least
the capability module and a few easy cases in selinux/smack work
with RCU walks with CONFIG_SECURITY=y
Signed-off-by: NAndi Kleen <ak@linux.intel.com>
Signed-off-by: NEric Paris <eparis@redhat.com>
      1c990429
  25. 23 4月, 2011 1 次提交
  27. 04 3月, 2011 1 次提交
    • E
      LSM: Pass -o remount options to the LSM · ff36fe2c
      由 Eric Paris 提交于 
      The VFS mount code passes the mount options to the LSM.  The LSM will remove
options it understands from the data and the VFS will then pass the remaining
options onto the underlying filesystem.  This is how options like the
SELinux context= work.  The problem comes in that -o remount never calls
into LSM code.  So if you include an LSM specific option it will get passed
to the filesystem and will cause the remount to fail.  An example of where
this is a problem is the 'seclabel' option.  The SELinux LSM hook will
print this word in /proc/mounts if the filesystem is being labeled using
xattrs.  If you pass this word on mount it will be silently stripped and
ignored.  But if you pass this word on remount the LSM never gets called
and it will be passed to the FS.  The FS doesn't know what seclabel means
and thus should fail the mount.  For example an ext3 fs mounted over loop

# mount -o loop /tmp/fs /mnt/tmp
# cat /proc/mounts | grep /mnt/tmp
/dev/loop0 /mnt/tmp ext3 rw,seclabel,relatime,errors=continue,barrier=0,data=ordered 0 0
# mount -o remount /mnt/tmp
mount: /mnt/tmp not mounted already, or bad option
# dmesg
EXT3-fs (loop0): error: unrecognized mount option "seclabel" or missing value

This patch passes the remount mount options to an new LSM hook.
Signed-off-by: NEric Paris <eparis@redhat.com>
Reviewed-by: NJames Morris <jmorris@namei.org>
      ff36fe2c
  29. 23 2月, 2011 1 次提交
  31. 02 2月, 2011 2 次提交
    • L
      security: remove unused security_sysctl hook · 4916ca40
      由 Lucian Adrian Grijincu 提交于 
      The only user for this hook was selinux. sysctl routes every call
through /proc/sys/. Selinux and other security modules use the file
system checks for sysctl too, so no need for this hook any more.
Signed-off-by: NLucian Adrian Grijincu <lucian.grijincu@gmail.com>
Signed-off-by: NEric Paris <eparis@redhat.com>
      4916ca40
    • E
      fs/vfs/security: pass last path component to LSM on inode creation · 2a7dba39
      由 Eric Paris 提交于 
      SELinux would like to implement a new labeling behavior of newly created
inodes.  We currently label new inodes based on the parent and the creating
process.  This new behavior would also take into account the name of the
new object when deciding the new label.  This is not the (supposed) full path,
just the last component of the path.

This is very useful because creating /etc/shadow is different than creating
/etc/passwd but the kernel hooks are unable to differentiate these
operations.  We currently require that userspace realize it is doing some
difficult operation like that and than userspace jumps through SELinux hoops
to get things set up correctly.  This patch does not implement new
behavior, that is obviously contained in a seperate SELinux patch, but it
does pass the needed name down to the correct LSM hook.  If no such name
exists it is fine to pass NULL.
Signed-off-by: NEric Paris <eparis@redhat.com>
      2a7dba39
  33. 06 1月, 2011 1 次提交
  35. 16 11月, 2010 1 次提交
  37. 21 10月, 2010 1 次提交
  39. 02 8月, 2010 2 次提交
  41. 16 7月, 2010 1 次提交
  43. 17 5月, 2010 1 次提交
  45. 12 4月, 2010 11 次提交