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authorRafal Krypa <r.krypa@samsung.com>2016-12-09 14:03:04 +0100
committerCasey Schaufler <casey@schaufler-ca.com>2017-01-10 09:47:20 -0800
commit805b65a80bed029572c6462cc4be0a260e1482e9 (patch)
treef21d839811af68fe82c609cf3bdb7b32d33f1c5e /security/smack
parentc9d238a18baa92600ba015d6d6c2cde53f55c572 (diff)
Smack: fix d_instantiate logic for sockfs and pipefs
Since 4b936885a (v2.6.32) all inodes on sockfs and pipefs are disconnected. It caused filesystem specific code in smack_d_instantiate to be skipped, because all inodes on those pseudo filesystems were treated as root inodes. As a result all sockfs inodes had the Smack label set to floor. In most cases access checks for sockets use socket_smack data so the inode label is not important. But there are special cases that were broken. One example would be calling fcntl with F_SETOWN command on a socket fd. Now smack_d_instantiate expects all pipefs and sockfs inodes to be disconnected and has the logic in appropriate place. Signed-off-by: Rafal Krypa <r.krypa@samsung.com> Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Diffstat (limited to 'security/smack')
-rw-r--r--security/smack/smack_lsm.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 681583d66c0e..225c4ad56444 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -3486,6 +3486,13 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
case PIPEFS_MAGIC:
isp->smk_inode = smk_of_current();
break;
+ case SOCKFS_MAGIC:
+ /*
+ * Socket access is controlled by the socket
+ * structures associated with the task involved.
+ */
+ isp->smk_inode = &smack_known_star;
+ break;
default:
isp->smk_inode = sbsp->smk_root;
break;
@@ -3502,19 +3509,12 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
*/
switch (sbp->s_magic) {
case SMACK_MAGIC:
- case PIPEFS_MAGIC:
- case SOCKFS_MAGIC:
case CGROUP_SUPER_MAGIC:
/*
* Casey says that it's a little embarrassing
* that the smack file system doesn't do
* extended attributes.
*
- * Casey says pipes are easy (?)
- *
- * Socket access is controlled by the socket
- * structures associated with the task involved.
- *
* Cgroupfs is special
*/
final = &smack_known_star;