kernel: smack security backport from kernel 4

Here is the backport of all patches relating to smack support
on kernel side. For more details, see file:

  meta-rcar-gen2/recipes-kernel/linux/linux-renesas/smack/README

Please note that patches are applied only if "smack" is in the
ditro features. Here are the 2 lines to add in the local.conf

OVERRIDES .= ":smack"
DISTRO_FEATURES_append = " smack"

Change-Id: I147a3532aec531f977d6ec34c576261835711f1e
Signed-off-by: Yannick GICQUEL <yannick.gicquel@iot.bzh>
Signed-off-by: José Bollo <jose.bollo@iot.bzh>

1 files changed, 33 insertions, 0 deletions

diff --git a/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/smack/0018-Smack-change-rule-cap-check.patch b/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/smack/0018-Smack-change-rule-cap-check.patch
new file mode 100644
index 0000000..1af9b40
--- /dev/null
+++ b/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/smack/0018-Smack-change-rule-cap-check.patch
@@ -0,0 +1,33 @@
+From 791a375032d5224c6ebb5937d5816cef2917874b Mon Sep 17 00:00:00 2001
+From: Casey Schaufler <casey@schaufler-ca.com>
+Date: Thu, 19 Dec 2013 13:23:26 -0800
+Subject: [PATCH 18/54] Smack: change rule cap check
+
+smk_write_change_rule() is calling capable rather than
+the more correct smack_privileged(). This allows for setting
+rules in violation of the onlycap facility. This is the
+simple repair.
+
+Targeted for git://git.gitorious.org/smack-next/kernel.git
+
+Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
+---
+ security/smack/smackfs.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
+index f5a6bb8..3198cfe 100644
+--- a/security/smack/smackfs.c
++++ b/security/smack/smackfs.c
+@@ -2152,7 +2152,7 @@ static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
+ 	/*
+ 	 * Must have privilege.
+ 	 */
+-	if (!capable(CAP_MAC_ADMIN))
++	if (!smack_privileged(CAP_MAC_ADMIN))
+ 		return -EPERM;
+ 
+ 	return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
+-- 
+2.1.4
+