[PATCH] selinux: enable genfscon labeling for securityfs

[liem <liem16213@gmail.com>]

From: Christian Göttsche <cgzones@googlemail.com>

Add support for genfscon per-file labeling of securityfs files.
This allows for separate labels and thereby access control for
different files. For example a genfscon statement

    genfscon securityfs /integrity/ima/policy \
	system_u:object_r:ima_policy_t:s0

will set a private label to the IMA policy file and thus allow to
control the ability to set the IMA policy. Setting labels directly
with setxattr(2), e.g. by chcon(1) or setfiles(8), is still not
supported.

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
[PM: line width fixes in the commit description]
Signed-off-by: Paul Moore <paul@paul-moore.com>
(cherry picked from commit 8a764ef1bd43fb2bb4ff3290746e5c820a3a9716)
---
 security/selinux/hooks.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 69143a216a3c..1c0f8209f130 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -741,7 +741,8 @@ static int selinux_set_mnt_opts(struct super_block *sb,
 	    !strcmp(sb->s_type->name, "tracefs") ||
 	    !strcmp(sb->s_type->name, "binder") ||
 	    !strcmp(sb->s_type->name, "bpf") ||
-	    !strcmp(sb->s_type->name, "pstore"))
+	    !strcmp(sb->s_type->name, "pstore") ||
+	    !strcmp(sb->s_type->name, "securityfs"))
 		sbsec->flags |= SE_SBGENFS;
 
 	if (!strcmp(sb->s_type->name, "sysfs") ||
-- 
2.34.1