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-rw-r--r--meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/linux-raspberrypi/0001-Smack-File-receive-for-sockets.patch65
1 files changed, 65 insertions, 0 deletions
diff --git a/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/linux-raspberrypi/0001-Smack-File-receive-for-sockets.patch b/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/linux-raspberrypi/0001-Smack-File-receive-for-sockets.patch
new file mode 100644
index 000000000..4021e5d38
--- /dev/null
+++ b/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/linux-raspberrypi/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
+