[PATCH] pass MAY_OPEN to vfs_permission() explicitly

... and get rid of the last "let's deduce mask from nameidata->flags"
bit.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

7 files changed, 15 insertions, 24 deletions

diff --git a/fs/exec.c b/fs/exec.c
index b8792a131533..0ba5d355c5a1 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -118,7 +118,7 @@ asmlinkage long sys_uselib(const char __user * library)
         if (!S_ISREG(nd.path.dentry->d_inode->i_mode))
                 goto exit;
 
-        error = vfs_permission(&nd, MAY_READ | MAY_EXEC);
+        error = vfs_permission(&nd, MAY_READ | MAY_EXEC | MAY_OPEN);
         if (error)
                 goto exit;
 
@@ -666,7 +666,7 @@ struct file *open_exec(const char *name)
                 struct inode *inode = nd.path.dentry->d_inode;
                 file = ERR_PTR(-EACCES);
                 if (S_ISREG(inode->i_mode)) {
-                        int err = vfs_permission(&nd, MAY_EXEC);
+                        int err = vfs_permission(&nd, MAY_EXEC | MAY_OPEN);
                         file = ERR_PTR(err);
                         if (!err) {
                                 file = nameidata_to_filp(&nd,
diff --git a/fs/namei.c b/fs/namei.c
index 33dcaf025c49..6b0e8e5e079e 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -263,12 +263,7 @@ int permission(struct inode *inode, int mask, struct nameidata *nd)
 
         /* Ordinary permission routines do not understand MAY_APPEND. */
         if (inode->i_op && inode->i_op->permission) {
-                int extra = 0;
-                if (nd) {
-                        if (nd->flags & LOOKUP_OPEN)
-                                extra |= MAY_OPEN;
-                }
-                retval = inode->i_op->permission(inode, mask | extra);
+                retval = inode->i_op->permission(inode, mask);
                 if (!retval) {
                         /*
                          * Exec permission on a regular file is denied if none
@@ -292,7 +287,7 @@ int permission(struct inode *inode, int mask, struct nameidata *nd)
                 return retval;
 
         return security_inode_permission(inode,
-                        mask & (MAY_READ|MAY_WRITE|MAY_EXEC), nd);
+                        mask & (MAY_READ|MAY_WRITE|MAY_EXEC));
 }
 
 /**
@@ -492,7 +487,7 @@ static int exec_permission_lite(struct inode *inode,
 
         return -EACCES;
 ok:
-        return security_inode_permission(inode, MAY_EXEC, nd);
+        return security_inode_permission(inode, MAY_EXEC);
 }
 
 /*
@@ -1692,7 +1687,7 @@ struct file *do_filp_open(int dfd, const char *pathname,
         int will_write;
         int flag = open_to_namei_flags(open_flag);
 
-        acc_mode = ACC_MODE(flag);
+        acc_mode = MAY_OPEN | ACC_MODE(flag);
 
         /* O_TRUNC implies we need access checks for write permissions */
         if (flag & O_TRUNC)
diff --git a/include/linux/security.h b/include/linux/security.h
index f0e9adb22ac2..fd96e7f8a6f9 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -1362,7 +1362,7 @@ struct security_operations {
                              struct inode *new_dir, struct dentry *new_dentry);
         int (*inode_readlink) (struct dentry *dentry);
         int (*inode_follow_link) (struct dentry *dentry, struct nameidata *nd);
-        int (*inode_permission) (struct inode *inode, int mask, struct nameidata *nd);
+        int (*inode_permission) (struct inode *inode, int mask);
         int (*inode_setattr)    (struct dentry *dentry, struct iattr *attr);
         int (*inode_getattr) (struct vfsmount *mnt, struct dentry *dentry);
         void (*inode_delete) (struct inode *inode);
@@ -1628,7 +1628,7 @@ int security_inode_rename(struct inode *old_dir, struct dentry *old_dentry,
                           struct inode *new_dir, struct dentry *new_dentry);
 int security_inode_readlink(struct dentry *dentry);
 int security_inode_follow_link(struct dentry *dentry, struct nameidata *nd);
-int security_inode_permission(struct inode *inode, int mask, struct nameidata *nd);
+int security_inode_permission(struct inode *inode, int mask);
 int security_inode_setattr(struct dentry *dentry, struct iattr *attr);
 int security_inode_getattr(struct vfsmount *mnt, struct dentry *dentry);
 void security_inode_delete(struct inode *inode);
@@ -2021,8 +2021,7 @@ static inline int security_inode_follow_link(struct dentry *dentry,
         return 0;
 }
 
-static inline int security_inode_permission(struct inode *inode, int mask,
-                                             struct nameidata *nd)
+static inline int security_inode_permission(struct inode *inode, int mask)
 {
         return 0;
 }
diff --git a/security/capability.c b/security/capability.c
index 5b01c0b02422..63d10da515a5 100644
--- a/security/capability.c
+++ b/security/capability.c
@@ -211,8 +211,7 @@ static int cap_inode_follow_link(struct dentry *dentry,
         return 0;
 }
 
-static int cap_inode_permission(struct inode *inode, int mask,
-                                struct nameidata *nd)
+static int cap_inode_permission(struct inode *inode, int mask)
 {
         return 0;
 }
diff --git a/security/security.c b/security/security.c
index 59f23b5918b3..78ed3ffde242 100644
--- a/security/security.c
+++ b/security/security.c
@@ -429,11 +429,11 @@ int security_inode_follow_link(struct dentry *dentry, struct nameidata *nd)
         return security_ops->inode_follow_link(dentry, nd);
 }
 
-int security_inode_permission(struct inode *inode, int mask, struct nameidata *nd)
+int security_inode_permission(struct inode *inode, int mask)
 {
         if (unlikely(IS_PRIVATE(inode)))
                 return 0;
-        return security_ops->inode_permission(inode, mask, nd);
+        return security_ops->inode_permission(inode, mask);
 }
 
 int security_inode_setattr(struct dentry *dentry, struct iattr *attr)
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 3481cde5bf15..5ba13908b5b4 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2624,12 +2624,11 @@ static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *na
         return dentry_has_perm(current, NULL, dentry, FILE__READ);
 }
 
-static int selinux_inode_permission(struct inode *inode, int mask,
-                                    struct nameidata *nd)
+static int selinux_inode_permission(struct inode *inode, int mask)
 {
         int rc;
 
-        rc = secondary_ops->inode_permission(inode, mask, nd);
+        rc = secondary_ops->inode_permission(inode, mask);
         if (rc)
                 return rc;
 
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index ee5a51cbc5eb..1b40e558f983 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -522,8 +522,7 @@ static int smack_inode_rename(struct inode *old_inode,
  *
  * Returns 0 if access is permitted, -EACCES otherwise
  */
-static int smack_inode_permission(struct inode *inode, int mask,
-                                  struct nameidata *nd)
+static int smack_inode_permission(struct inode *inode, int mask)
 {
         /*
          * No permission to check. Existence test. Yup, it's there.