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, 32 insertions, 0 deletions

diff --git a/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/smack/0037-Smack-Fix-setting-label-on-successful-file-open.patch b/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/smack/0037-Smack-Fix-setting-label-on-successful-file-open.patch
new file mode 100644
index 0000000..071b4ef
--- /dev/null
+++ b/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/smack/0037-Smack-Fix-setting-label-on-successful-file-open.patch
@@ -0,0 +1,32 @@
+From c0b37ae4c6cee96e2d6ae755b32c039cba38f4b2 Mon Sep 17 00:00:00 2001
+From: Marcin Niesluchowski <m.niesluchow@samsung.com>
+Date: Tue, 19 Aug 2014 14:26:32 +0200
+Subject: [PATCH 37/54] Smack: Fix setting label on successful file open
+
+While opening with CAP_MAC_OVERRIDE file label is not set.
+Other calls may access it after CAP_MAC_OVERRIDE is dropped from process.
+
+Signed-off-by: Marcin Niesluchowski <m.niesluchow@samsung.com>
+---
+ security/smack/smack_lsm.c | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
+index 1befb0a..97eab635 100644
+--- a/security/smack/smack_lsm.c
++++ b/security/smack/smack_lsm.c
+@@ -1477,8 +1477,10 @@ static int smack_file_open(struct file *file, const struct cred *cred)
+ 	struct smk_audit_info ad;
+ 	int rc;
+ 
+-	if (smack_privileged(CAP_MAC_OVERRIDE))
++	if (smack_privileged(CAP_MAC_OVERRIDE)) {
++		file->f_security = isp->smk_inode;
+ 		return 0;
++	}
+ 
+ 	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
+ 	smk_ad_setfield_u_fs_path(&ad, file->f_path);
+-- 
+2.1.4
+