Merge tag 'selinux-pr-20190312' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux

Pull selinux fixes from Paul Moore:
 "Two small fixes for SELinux in v5.1: one adds a buffer length check to
  the SELinux SCTP code, the other ensures that the SELinux labeling for
  a NFS mount is not disabled if the filesystem is mounted twice"

* tag 'selinux-pr-20190312' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux:
  security/selinux: fix SECURITY_LSM_NATIVE_LABELS on reused superblock
  selinux: add the missing walk_size + len check in selinux_sctp_bind_connect

1 files changed, 7 insertions, 1 deletions

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index c5363f0c67ef..1d0b37af2444 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -939,8 +939,11 @@ static int selinux_sb_clone_mnt_opts(const struct super_block *oldsb,
         BUG_ON(!(oldsbsec->flags & SE_SBINITIALIZED));
 
         /* if fs is reusing a sb, make sure that the contexts match */
-        if (newsbsec->flags & SE_SBINITIALIZED)
+        if (newsbsec->flags & SE_SBINITIALIZED) {
+                if ((kern_flags & SECURITY_LSM_NATIVE_LABELS) && !set_context)
+                        *set_kern_flags |= SECURITY_LSM_NATIVE_LABELS;
                 return selinux_cmp_sb_context(oldsb, newsb);
+        }
 
         mutex_lock(&newsbsec->lock);
 
@@ -5134,6 +5137,9 @@ static int selinux_sctp_bind_connect(struct sock *sk, int optname,
                         return -EINVAL;
                 }
 
+                if (walk_size + len > addrlen)
+                        return -EINVAL;
+
                 err = -EINVAL;
                 switch (optname) {
                 /* Bind checks */