Support per-file labeling of sysfs and pstore files based on
genfscon policy entries. This is safe because the sysfs
and pstore directory tree cannot be manipulated by userspace,
except to unlink pstore entries.
This provides an alternative method of assigning per-file labeling
to sysfs or pstore files without needing to set the labels from
userspace on each boot. The advantages of this approach are that
the labels are assigned as soon as the dentry is first instantiated
and userspace does not need to walk the sysfs or pstore tree and
set the labels on each boot. The limitations of this approach are
that the labels can only be assigned based on pathname prefix matching.
You can initially assign labels using this mechanism and then change
them at runtime via setxattr if allowed to do so by policy.
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Suggested-by: Dominick Grift <dac.override@gmail.com>
(cherry picked from commit 8ad47acc40b2fce1a4d381b7459bf5cb54f9057b)
Change-Id: I721d6e5096cde5f669481a91ce60ee1de5e428fb
Signed-off-by: Dylan Reid <dgreid@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/285987
Reviewed-by: Olof Johansson <olofj@chromium.org>
8d2264b8cb