LSM: separate LSM_AUDIT_DATA_DENTRY from LSM_AUDIT_DATA_PATH

This patch separates and audit message that only contains a dentry from
one that contains a full path.  This allows us to make it harder to
misuse the interfaces or for the interfaces to be implemented wrong.

Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>

2 files changed, 21 insertions, 20 deletions

diff --git a/security/smack/smack.h b/security/smack/smack.h
index a16925c0e91a..2b6c6a516123 100644
--- a/security/smack/smack.h
+++ b/security/smack/smack.h
@@ -316,12 +316,7 @@ static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
 static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
                                                     struct dentry *d)
 {
-        a->a.u.path.dentry = d;
-}
-static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a,
-                                                 struct vfsmount *m)
-{
-        a->a.u.path.mnt = m;
+        a->a.u.dentry = d;
 }
 static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
                                               struct inode *i)
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index eeb393fbf925..a3bdd1383928 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -383,7 +383,7 @@ static int smack_sb_statfs(struct dentry *dentry)
         int rc;
         struct smk_audit_info ad;
 
-        smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
+        smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
 
         rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
@@ -425,10 +425,13 @@ static int smack_sb_umount(struct vfsmount *mnt, int flags)
 {
         struct superblock_smack *sbp;
         struct smk_audit_info ad;
+        struct path path;
+
+        path.dentry = mnt->mnt_root;
+        path.mnt = mnt;
 
         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
-        smk_ad_setfield_u_fs_path_dentry(&ad, mnt->mnt_root);
-        smk_ad_setfield_u_fs_path_mnt(&ad, mnt);
+        smk_ad_setfield_u_fs_path(&ad, path);
 
         sbp = mnt->mnt_sb->s_security;
         return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
@@ -563,7 +566,7 @@ static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
         struct smk_audit_info ad;
         int rc;
 
-        smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
+        smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
         smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
 
         isp = smk_of_inode(old_dentry->d_inode);
@@ -592,7 +595,7 @@ static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
         struct smk_audit_info ad;
         int rc;
 
-        smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
+        smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
 
         /*
@@ -623,7 +626,7 @@ static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
         struct smk_audit_info ad;
         int rc;
 
-        smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
+        smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
 
         /*
@@ -663,7 +666,7 @@ static int smack_inode_rename(struct inode *old_inode,
         char *isp;
         struct smk_audit_info ad;
 
-        smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
+        smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
         smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
 
         isp = smk_of_inode(old_dentry->d_inode);
@@ -720,7 +723,7 @@ static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
          */
         if (iattr->ia_valid & ATTR_FORCE)
                 return 0;
-        smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
+        smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
 
         return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
@@ -736,10 +739,13 @@ static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
 static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
 {
         struct smk_audit_info ad;
+        struct path path;
+
+        path.dentry = dentry;
+        path.mnt = mnt;
 
         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
-        smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
-        smk_ad_setfield_u_fs_path_mnt(&ad, mnt);
+        smk_ad_setfield_u_fs_path(&ad, path);
         return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
 }
 
@@ -784,7 +790,7 @@ static int smack_inode_setxattr(struct dentry *dentry, const char *name,
         } else
                 rc = cap_inode_setxattr(dentry, name, value, size, flags);
 
-        smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
+        smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
 
         if (rc == 0)
@@ -845,7 +851,7 @@ static int smack_inode_getxattr(struct dentry *dentry, const char *name)
 {
         struct smk_audit_info ad;
 
-        smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
+        smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
 
         return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
@@ -877,7 +883,7 @@ static int smack_inode_removexattr(struct dentry *dentry, const char *name)
         } else
                 rc = cap_inode_removexattr(dentry, name);
 
-        smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
+        smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
         if (rc == 0)
                 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
@@ -1070,7 +1076,7 @@ static int smack_file_lock(struct file *file, unsigned int cmd)
 {
         struct smk_audit_info ad;
 
-        smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
+        smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
         smk_ad_setfield_u_fs_path_dentry(&ad, file->f_path.dentry);
         return smk_curacc(file->f_security, MAY_WRITE, &ad);
 }