selinux: enable genfscon labeling for sysfs and pstore files

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.

Change-Id: If5999785fdc1d24d869b23ae35cd302311e94562
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Suggested-by: Dominick Grift <dac.override@gmail.com>

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 69e6e80b9782ee25c2c75d6b02425a3a6de17b3f..899b29e3d60aab4c5706d26c4a7d72794ef7f95d 100644 (file)
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -700,7 +700,9 @@ static int selinux_set_mnt_opts(struct super_block *sb,
        if (strcmp(sb->s_type->name, "proc") == 0)
                sbsec->flags |= SE_SBPROC | SE_SBGENFS;
 
-       if (strcmp(sb->s_type->name, "debugfs") == 0)
+       if (!strcmp(sb->s_type->name, "debugfs") ||
+           !strcmp(sb->s_type->name, "sysfs") ||
+           !strcmp(sb->s_type->name, "pstore"))
                sbsec->flags |= SE_SBGENFS;
 
        /* Determine the labeling behavior to use for this filesystem type. */