Switch open_exec() and sys_uselib() to do_open_filp()

... and make path_lookup_open() static

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

3 files changed, 33 insertions, 54 deletions

diff --git a/fs/exec.c b/fs/exec.c
index 41ae8e0de72d..895823d0149d 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -105,36 +105,28 @@ static inline void put_binfmt(struct linux_binfmt * fmt)
 SYSCALL_DEFINE1(uselib, const char __user *, library)
 {
         struct file *file;
-        struct nameidata nd;
         char *tmp = getname(library);
         int error = PTR_ERR(tmp);
 
-        if (!IS_ERR(tmp)) {
-                error = path_lookup_open(AT_FDCWD, tmp,
-                                         LOOKUP_FOLLOW, &nd,
-                                         FMODE_READ|FMODE_EXEC);
-                putname(tmp);
-        }
-        if (error)
+        if (IS_ERR(tmp))
+                goto out;
+
+        file = do_filp_open(AT_FDCWD, tmp,
+                                O_LARGEFILE | O_RDONLY | FMODE_EXEC, 0,
+                                MAY_READ | MAY_EXEC | MAY_OPEN);
+        putname(tmp);
+        error = PTR_ERR(file);
+        if (IS_ERR(file))
                 goto out;
 
         error = -EINVAL;
-        if (!S_ISREG(nd.path.dentry->d_inode->i_mode))
+        if (!S_ISREG(file->f_path.dentry->d_inode->i_mode))
                 goto exit;
 
         error = -EACCES;
-        if (nd.path.mnt->mnt_flags & MNT_NOEXEC)
-                goto exit;
-
-        error = may_open(&nd.path, MAY_READ | MAY_EXEC | MAY_OPEN, 0);
-        if (error)
+        if (file->f_path.mnt->mnt_flags & MNT_NOEXEC)
                 goto exit;
 
-        file = nameidata_to_filp(&nd, O_RDONLY|O_LARGEFILE);
-        error = PTR_ERR(file);
-        if (IS_ERR(file))
-                goto out;
-
         fsnotify_open(file->f_path.dentry);
 
         error = -ENOEXEC;
@@ -156,13 +148,10 @@ SYSCALL_DEFINE1(uselib, const char __user *, library)
                 }
                 read_unlock(&binfmt_lock);
         }
+exit:
         fput(file);
 out:
         return error;
-exit:
-        release_open_intent(&nd);
-        path_put(&nd.path);
-        goto out;
 }
 
 #ifdef CONFIG_MMU
@@ -657,44 +646,33 @@ EXPORT_SYMBOL(setup_arg_pages);
 
 struct file *open_exec(const char *name)
 {
-        struct nameidata nd;
         struct file *file;
         int err;
 
-        err = path_lookup_open(AT_FDCWD, name, LOOKUP_FOLLOW, &nd,
-                                FMODE_READ|FMODE_EXEC);
-        if (err)
+        file = do_filp_open(AT_FDCWD, name,
+                                O_LARGEFILE | O_RDONLY | FMODE_EXEC, 0,
+                                MAY_EXEC | MAY_OPEN);
+        if (IS_ERR(file))
                 goto out;
 
         err = -EACCES;
-        if (!S_ISREG(nd.path.dentry->d_inode->i_mode))
-                goto out_path_put;
-
-        if (nd.path.mnt->mnt_flags & MNT_NOEXEC)
-                goto out_path_put;
-
-        err = may_open(&nd.path, MAY_EXEC | MAY_OPEN, 0);
-        if (err)
-                goto out_path_put;
+        if (!S_ISREG(file->f_path.dentry->d_inode->i_mode))
+                goto exit;
 
-        file = nameidata_to_filp(&nd, O_RDONLY|O_LARGEFILE);
-        if (IS_ERR(file))
-                return file;
+        if (file->f_path.mnt->mnt_flags & MNT_NOEXEC)
+                goto exit;
 
         fsnotify_open(file->f_path.dentry);
 
         err = deny_write_access(file);
-        if (err) {
-                fput(file);
-                goto out;
-        }
+        if (err)
+                goto exit;
 
+out:
         return file;
 
- out_path_put:
-        release_open_intent(&nd);
-        path_put(&nd.path);
- out:
+exit:
+        fput(file);
         return ERR_PTR(err);
 }
 EXPORT_SYMBOL(open_exec);
diff --git a/fs/namei.c b/fs/namei.c
index 78f253cd2d4f..967c3db92724 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1130,8 +1130,8 @@ int vfs_path_lookup(struct dentry *dentry, struct vfsmount *mnt,
  * @nd: pointer to nameidata
  * @open_flags: open intent flags
  */
-int path_lookup_open(int dfd, const char *name, unsigned int lookup_flags,
-                struct nameidata *nd, int open_flags)
+static int path_lookup_open(int dfd, const char *name,
+                unsigned int lookup_flags, struct nameidata *nd, int open_flags)
 {
         struct file *filp = get_empty_filp();
         int err;
@@ -1637,18 +1637,19 @@ static int open_will_write_to_fs(int flag, struct inode *inode)
  * open_to_namei_flags() for more details.
  */
 struct file *do_filp_open(int dfd, const char *pathname,
-                int open_flag, int mode)
+                int open_flag, int mode, int acc_mode)
 {
         struct file *filp;
         struct nameidata nd;
-        int acc_mode, error;
+        int error;
         struct path path;
         struct dentry *dir;
         int count = 0;
         int will_write;
         int flag = open_to_namei_flags(open_flag);
 
-        acc_mode = MAY_OPEN | ACC_MODE(flag);
+        if (!acc_mode)
+                acc_mode = MAY_OPEN | ACC_MODE(flag);
 
         /* O_TRUNC implies we need access checks for write permissions */
         if (flag & O_TRUNC)
@@ -1869,7 +1870,7 @@ do_link:
  */
 struct file *filp_open(const char *filename, int flags, int mode)
 {
-        return do_filp_open(AT_FDCWD, filename, flags, mode);
+        return do_filp_open(AT_FDCWD, filename, flags, mode, 0);
 }
 EXPORT_SYMBOL(filp_open);
 
diff --git a/fs/open.c b/fs/open.c
index 377eb25b6abf..bdfbf03615a4 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -1033,7 +1033,7 @@ long do_sys_open(int dfd, const char __user *filename, int flags, int mode)
         if (!IS_ERR(tmp)) {
                 fd = get_unused_fd_flags(flags);
                 if (fd >= 0) {
-                        struct file *f = do_filp_open(dfd, tmp, flags, mode);
+                        struct file *f = do_filp_open(dfd, tmp, flags, mode, 0);
                         if (IS_ERR(f)) {
                                 put_unused_fd(fd);
                                 fd = PTR_ERR(f);