dra7xx-evm: Fix issue with bluetooth pairing

This patch is ported from meta-agl-extra
Commit details below:

 commit c50805d25ba95473e8b4d1eb28d1203a328cd77a
 Author: José Bollo <jose.bollo@iot.bzh>

Change-Id: I54a40935d6d2bbd9c267985c9e23a14bdffb7a3c
Signed-off-by: Karthik Ramanan <a0393906@ti.com>

1 files changed, 65 insertions, 0 deletions

diff --git a/meta-agl-bsp/meta-ti/recipes-kernel/linux/files/0001-Smack-File-receive-for-sockets.patch b/meta-agl-bsp/meta-ti/recipes-kernel/linux/files/0001-Smack-File-receive-for-sockets.patch
new file mode 100644
index 000000000..4021e5d38
--- /dev/null
+++ b/meta-agl-bsp/meta-ti/recipes-kernel/linux/files/0001-Smack-File-receive-for-sockets.patch
@@ -0,0 +1,65 @@
+From 2b206c36b16e72cfe41cd22448d8527359ffd962 Mon Sep 17 00:00:00 2001
+From: Casey Schaufler <casey@schaufler-ca.com>
+Date: Mon, 7 Dec 2015 14:34:32 -0800
+Subject: [PATCH 1/4] Smack: File receive for sockets
+
+The existing file receive hook checks for access on
+the file inode even for UDS. This is not right, as
+the inode is not used by Smack to make access checks
+for sockets. This change checks for an appropriate
+access relationship between the receiving (current)
+process and the socket. If the process can't write
+to the socket's send label or the socket's receive
+label can't write to the process fail.
+
+This will allow the legitimate cases, where the
+socket sender and socket receiver can freely communicate.
+Only strangly set socket labels should cause a problem.
+
+Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
+---
+ security/smack/smack_lsm.c | 22 ++++++++++++++++++++++
+ 1 file changed, 22 insertions(+)
+
+diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
+index ff81026..b20ef06 100644
+--- a/security/smack/smack_lsm.c
++++ b/security/smack/smack_lsm.c
+@@ -1860,12 +1860,34 @@ static int smack_file_receive(struct file *file)
+ 	int may = 0;
+ 	struct smk_audit_info ad;
+ 	struct inode *inode = file_inode(file);
++	struct socket *sock;
++	struct task_smack *tsp;
++	struct socket_smack *ssp;
+ 
+ 	if (unlikely(IS_PRIVATE(inode)))
+ 		return 0;
+ 
+ 	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
+ 	smk_ad_setfield_u_fs_path(&ad, file->f_path);
++
++	if (S_ISSOCK(inode->i_mode)) {
++		sock = SOCKET_I(inode);
++		ssp = sock->sk->sk_security;
++		tsp = current_security();
++		/*
++		 * If the receiving process can't write to the
++		 * passed socket or if the passed socket can't
++		 * write to the receiving process don't accept
++		 * the passed socket.
++		 */
++		rc = smk_access(tsp->smk_task, ssp->smk_out, MAY_WRITE, &ad);
++		rc = smk_bu_file(file, may, rc);
++		if (rc < 0)
++			return rc;
++		rc = smk_access(ssp->smk_in, tsp->smk_task, MAY_WRITE, &ad);
++		rc = smk_bu_file(file, may, rc);
++		return rc;
++	}
+ 	/*
+ 	 * This code relies on bitmasks.
+ 	 */
+-- 
+2.7.4
+