4 files changed, 21 insertions, 33 deletions

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 1485e38daaa3..03c8d747be48 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1151,10 +1151,16 @@ static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
                 goto out_free_page;
 
         }
-        kloginuid = make_kuid(file->f_cred->user_ns, loginuid);
-        if (!uid_valid(kloginuid)) {
-                length = -EINVAL;
-                goto out_free_page;
+
+        /* is userspace tring to explicitly UNSET the loginuid? */
+        if (loginuid == AUDIT_UID_UNSET) {
+                kloginuid = INVALID_UID;
+        } else {
+                kloginuid = make_kuid(file->f_cred->user_ns, loginuid);
+                if (!uid_valid(kloginuid)) {
+                        length = -EINVAL;
+                        goto out_free_page;
+                }
         }
 
         length = audit_set_loginuid(kloginuid);
diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index 737e15615b04..cca93b6fb9a9 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -175,22 +175,6 @@ static const struct inode_operations proc_link_inode_operations = {
 };
 
 /*
- * As some entries in /proc are volatile, we want to 
- * get rid of unused dentries.  This could be made 
- * smarter: we could keep a "volatile" flag in the 
- * inode to indicate which ones to keep.
- */
-static int proc_delete_dentry(const struct dentry * dentry)
-{
-        return 1;
-}
-
-static const struct dentry_operations proc_dentry_operations =
-{
-        .d_delete       = proc_delete_dentry,
-};
-
-/*
  * Don't create negative dentries here, return -ENOENT by hand
  * instead.
  */
@@ -209,7 +193,7 @@ struct dentry *proc_lookup_de(struct proc_dir_entry *de, struct inode *dir,
                         inode = proc_get_inode(dir->i_sb, de);
                         if (!inode)
                                 return ERR_PTR(-ENOMEM);
-                        d_set_d_op(dentry, &proc_dentry_operations);
+                        d_set_d_op(dentry, &simple_dentry_operations);
                         d_add(dentry, inode);
                         return NULL;
                 }
diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 28955d4b7218..124fc43c7090 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -292,16 +292,20 @@ proc_reg_get_unmapped_area(struct file *file, unsigned long orig_addr,
 {
         struct proc_dir_entry *pde = PDE(file_inode(file));
         unsigned long rv = -EIO;
-        unsigned long (*get_area)(struct file *, unsigned long, unsigned long,
-                                  unsigned long, unsigned long) = NULL;
+
         if (use_pde(pde)) {
+                typeof(proc_reg_get_unmapped_area) *get_area;
+
+                get_area = pde->proc_fops->get_unmapped_area;
 #ifdef CONFIG_MMU
-                get_area = current->mm->get_unmapped_area;
+                if (!get_area)
+                        get_area = current->mm->get_unmapped_area;
 #endif
-                if (pde->proc_fops->get_unmapped_area)
-                        get_area = pde->proc_fops->get_unmapped_area;
+
                 if (get_area)
                         rv = get_area(file, orig_addr, len, pgoff, flags);
+                else
+                        rv = orig_addr;
                 unuse_pde(pde);
         }
         return rv;
diff --git a/fs/proc/namespaces.c b/fs/proc/namespaces.c
index 49a7fff2e83a..9ae46b87470d 100644
--- a/fs/proc/namespaces.c
+++ b/fs/proc/namespaces.c
@@ -42,12 +42,6 @@ static const struct inode_operations ns_inode_operations = {
         .setattr        = proc_setattr,
 };
 
-static int ns_delete_dentry(const struct dentry *dentry)
-{
-        /* Don't cache namespace inodes when not in use */
-        return 1;
-}
-
 static char *ns_dname(struct dentry *dentry, char *buffer, int buflen)
 {
         struct inode *inode = dentry->d_inode;
@@ -59,7 +53,7 @@ static char *ns_dname(struct dentry *dentry, char *buffer, int buflen)
 
 const struct dentry_operations ns_dentry_operations =
 {
-        .d_delete       = ns_delete_dentry,
+        .d_delete       = always_delete_dentry,
         .d_dname        = ns_dname,
 };