[PATCH] sanitize __user_walk_fd() et.al.

* do not pass nameidata; struct path is all the callers want.
* switch to new helpers:
	user_path_at(dfd, pathname, flags, &path)
	user_path(pathname, &path)
	user_lpath(pathname, &path)
	user_path_dir(pathname, &path)  (fail if not a directory)
  The last 3 are trivial macro wrappers for the first one.
* remove nameidata in callers.

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

diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
index 32ca1b9273078d7025466075e677a59e34938b33..6e943135f0e041346e63348a18fb33239113b9c1 100644 (file)
--- a/arch/alpha/kernel/osf_sys.c
+++ b/arch/alpha/kernel/osf_sys.c
@@ -253,15 +253,15 @@ do_osf_statfs(struct dentry * dentry, struct osf_statfs __user *buffer,
 }
 
 asmlinkage int
-osf_statfs(char __user *path, struct osf_statfs __user *buffer, unsigned long bufsiz)
+osf_statfs(char __user *pathname, struct osf_statfs __user *buffer, unsigned long bufsiz)
 {
-       struct nameidata nd;
+       struct path path;
        int retval;
 
-       retval = user_path_walk(path, &nd);
+       retval = user_path(pathname, &path);
        if (!retval) {
-               retval = do_osf_statfs(nd.path.dentry, buffer, bufsiz);
-               path_put(&nd.path);
+               retval = do_osf_statfs(path.dentry, buffer, bufsiz);
+               path_put(&path);
        }
        return retval;
 }

diff --git a/arch/parisc/hpux/sys_hpux.c b/arch/parisc/hpux/sys_hpux.c
index be255ebb609c98ddda7c280c0a1ca938d5d6f571..18072e03a019e1411b88a5e0b3fa1ee48e2b6458 100644 (file)
--- a/arch/parisc/hpux/sys_hpux.c
+++ b/arch/parisc/hpux/sys_hpux.c
@@ -210,19 +210,19 @@ static int vfs_statfs_hpux(struct dentry *dentry, struct hpux_statfs *buf)
 }
 
 /* hpux statfs */
-asmlinkage long hpux_statfs(const char __user *path,
+asmlinkage long hpux_statfs(const char __user *pathname,
                                                struct hpux_statfs __user *buf)
 {
-       struct nameidata nd;
+       struct path path;
        int error;
 
-       error = user_path_walk(path, &nd);
+       error = user_path(pathname, &path);
        if (!error) {
                struct hpux_statfs tmp;
-               error = vfs_statfs_hpux(nd.path.dentry, &tmp);
+               error = vfs_statfs_hpux(path.dentry, &tmp);
                if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
                        error = -EFAULT;
-               path_put(&nd.path);
+               path_put(&path);
        }
        return error;
 }

diff --git a/fs/coda/pioctl.c b/fs/coda/pioctl.c
index c38a98974fb0d0797448481c3da94f9eddb53723..c51365422aa8da4311133c3b0ff773421efbc723 100644 (file)
--- a/fs/coda/pioctl.c
+++ b/fs/coda/pioctl.c
@@ -49,7 +49,7 @@ static int coda_ioctl_permission(struct inode *inode, int mask)
 static int coda_pioctl(struct inode * inode, struct file * filp, 
                        unsigned int cmd, unsigned long user_data)
 {
-       struct nameidata nd;
+       struct path path;
         int error;
        struct PioctlData data;
         struct inode *target_inode = NULL;
@@ -64,21 +64,21 @@ static int coda_pioctl(struct inode * inode, struct file * filp,
          * Look up the pathname. Note that the pathname is in 
          * user memory, and namei takes care of this
          */
-        if ( data.follow ) {
-                error = user_path_walk(data.path, &nd);
+        if (data.follow) {
+                error = user_path(data.path, &path);
        } else {
-               error = user_path_walk_link(data.path, &nd);
+               error = user_lpath(data.path, &path);
        }
                
        if ( error ) {
                return error;
         } else {
-               target_inode = nd.path.dentry->d_inode;
+               target_inode = path.dentry->d_inode;
        }
        
        /* return if it is not a Coda inode */
        if ( target_inode->i_sb != inode->i_sb ) {
-               path_put(&nd.path);
+               path_put(&path);
                return  -EINVAL;
        }
 
@@ -87,7 +87,7 @@ static int coda_pioctl(struct inode * inode, struct file * filp,
 
        error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data);
 
-       path_put(&nd.path);
+       path_put(&path);
         return error;
 }
 

diff --git a/fs/compat.c b/fs/compat.c
index 106eba28ec5a8c7a4f05f906f9fea1f7fd421c5c..c9d1472e65c5a78288cd6c85c8c16f9bcd190a4c 100644 (file)
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -234,18 +234,18 @@ static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *
  * The following statfs calls are copies of code from fs/open.c and
  * should be checked against those from time to time
  */
-asmlinkage long compat_sys_statfs(const char __user *path, struct compat_statfs __user *buf)
+asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
 {
-       struct nameidata nd;
+       struct path path;
        int error;
 
-       error = user_path_walk(path, &nd);
+       error = user_path(pathname, &path);
        if (!error) {
                struct kstatfs tmp;
-               error = vfs_statfs(nd.path.dentry, &tmp);
+               error = vfs_statfs(path.dentry, &tmp);
                if (!error)
                        error = put_compat_statfs(buf, &tmp);
-               path_put(&nd.path);
+               path_put(&path);
        }
        return error;
 }
@@ -299,21 +299,21 @@ static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstat
        return 0;
 }
 
-asmlinkage long compat_sys_statfs64(const char __user *path, compat_size_t sz, struct compat_statfs64 __user *buf)
+asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
 {
-       struct nameidata nd;
+       struct path path;
        int error;
 
        if (sz != sizeof(*buf))
                return -EINVAL;
 
-       error = user_path_walk(path, &nd);
+       error = user_path(pathname, &path);
        if (!error) {
                struct kstatfs tmp;
-               error = vfs_statfs(nd.path.dentry, &tmp);
+               error = vfs_statfs(path.dentry, &tmp);
                if (!error)
                        error = put_compat_statfs64(buf, &tmp);
-               path_put(&nd.path);
+               path_put(&path);
        }
        return error;
 }

diff --git a/fs/inotify_user.c b/fs/inotify_user.c
index 9b99ebf2888432c5b21e5fac2604185ab74dd871..60249429a2530d11e6d5037e148d9a3c4fd00799 100644 (file)
--- a/fs/inotify_user.c
+++ b/fs/inotify_user.c
@@ -354,20 +354,20 @@ static void inotify_dev_event_dequeue(struct inotify_device *dev)
 }
 
 /*
- * find_inode - resolve a user-given path to a specific inode and return a nd
+ * find_inode - resolve a user-given path to a specific inode
  */
-static int find_inode(const char __user *dirname, struct nameidata *nd,
+static int find_inode(const char __user *dirname, struct path *path,
                      unsigned flags)
 {
        int error;
 
-       error = __user_walk(dirname, flags, nd);
+       error = user_path_at(AT_FDCWD, dirname, flags, path);
        if (error)
                return error;
        /* you can only watch an inode if you have read permissions on it */
-       error = inode_permission(nd->path.dentry->d_inode, MAY_READ);
+       error = inode_permission(path->dentry->d_inode, MAY_READ);
        if (error)
-               path_put(&nd->path);
+               path_put(path);
        return error;
 }
 
@@ -650,11 +650,11 @@ asmlinkage long sys_inotify_init(void)
        return sys_inotify_init1(0);
 }
 
-asmlinkage long sys_inotify_add_watch(int fd, const char __user *path, u32 mask)
+asmlinkage long sys_inotify_add_watch(int fd, const char __user *pathname, u32 mask)
 {
        struct inode *inode;
        struct inotify_device *dev;
-       struct nameidata nd;
+       struct path path;
        struct file *filp;
        int ret, fput_needed;
        unsigned flags = 0;
@@ -674,12 +674,12 @@ asmlinkage long sys_inotify_add_watch(int fd, const char __user *path, u32 mask)
        if (mask & IN_ONLYDIR)
                flags |= LOOKUP_DIRECTORY;
 
-       ret = find_inode(path, &nd, flags);
+       ret = find_inode(pathname, &path, flags);
        if (unlikely(ret))
                goto fput_and_out;
 
-       /* inode held in place by reference to nd; dev by fget on fd */
-       inode = nd.path.dentry->d_inode;
+       /* inode held in place by reference to path; dev by fget on fd */
+       inode = path.dentry->d_inode;
        dev = filp->private_data;
 
        mutex_lock(&dev->up_mutex);
@@ -688,7 +688,7 @@ asmlinkage long sys_inotify_add_watch(int fd, const char __user *path, u32 mask)
                ret = create_watch(dev, inode, mask);
        mutex_unlock(&dev->up_mutex);
 
-       path_put(&nd.path);
+       path_put(&path);
 fput_and_out:
        fput_light(filp, fput_needed);
        return ret;

diff --git a/fs/namei.c b/fs/namei.c
index 5029b93ebbd557471f57ff424226311193702fbc..edb5e973f9b3ca5aa1a2e838af16b92016cbaeed 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1334,24 +1334,24 @@ struct dentry *lookup_one_noperm(const char *name, struct dentry *base)
        return __lookup_hash(&this, base, NULL);
 }
 
-int __user_walk_fd(int dfd, const char __user *name, unsigned flags,
-                           struct nameidata *nd)
+int user_path_at(int dfd, const char __user *name, unsigned flags,
+                struct path *path)
 {
+       struct nameidata nd;
        char *tmp = getname(name);
        int err = PTR_ERR(tmp);
-
        if (!IS_ERR(tmp)) {
-               err = do_path_lookup(dfd, tmp, flags, nd);
+
+               BUG_ON(flags & LOOKUP_PARENT);
+
+               err = do_path_lookup(dfd, tmp, flags, &nd);
                putname(tmp);
+               if (!err)
+                       *path = nd.path;
        }
        return err;
 }
 
-int __user_walk(const char __user *name, unsigned flags, struct nameidata *nd)
-{
-       return __user_walk_fd(AT_FDCWD, name, flags, nd);
-}
-
 /*
  * It's inline, so penalty for filesystems that don't use sticky bit is
  * minimal.
@@ -2446,7 +2446,8 @@ asmlinkage long sys_linkat(int olddfd, const char __user *oldname,
                           int flags)
 {
        struct dentry *new_dentry;
-       struct nameidata nd, old_nd;
+       struct nameidata nd;
+       struct path old_path;
        int error;
        char * to;
 
@@ -2457,16 +2458,16 @@ asmlinkage long sys_linkat(int olddfd, const char __user *oldname,
        if (IS_ERR(to))
                return PTR_ERR(to);
 
-       error = __user_walk_fd(olddfd, oldname,
-                              flags & AT_SYMLINK_FOLLOW ? LOOKUP_FOLLOW : 0,
-                              &old_nd);
+       error = user_path_at(olddfd, oldname,
+                            flags & AT_SYMLINK_FOLLOW ? LOOKUP_FOLLOW : 0,
+                            &old_path);
        if (error)
                goto exit;
        error = do_path_lookup(newdfd, to, LOOKUP_PARENT, &nd);
        if (error)
                goto out;
        error = -EXDEV;
-       if (old_nd.path.mnt != nd.path.mnt)
+       if (old_path.mnt != nd.path.mnt)
                goto out_release;
        new_dentry = lookup_create(&nd, 0);
        error = PTR_ERR(new_dentry);
@@ -2475,7 +2476,7 @@ asmlinkage long sys_linkat(int olddfd, const char __user *oldname,
        error = mnt_want_write(nd.path.mnt);
        if (error)
                goto out_dput;
-       error = vfs_link(old_nd.path.dentry, nd.path.dentry->d_inode, new_dentry);
+       error = vfs_link(old_path.dentry, nd.path.dentry->d_inode, new_dentry);
        mnt_drop_write(nd.path.mnt);
 out_dput:
        dput(new_dentry);
@@ -2484,7 +2485,7 @@ out_unlock:
 out_release:
        path_put(&nd.path);
 out:
-       path_put(&old_nd.path);
+       path_put(&old_path);
 exit:
        putname(to);
 
@@ -2877,8 +2878,7 @@ const struct inode_operations page_symlink_inode_operations = {
        .put_link       = page_put_link,
 };
 
-EXPORT_SYMBOL(__user_walk);
-EXPORT_SYMBOL(__user_walk_fd);
+EXPORT_SYMBOL(user_path_at);
 EXPORT_SYMBOL(follow_down);
 EXPORT_SYMBOL(follow_up);
 EXPORT_SYMBOL(get_write_access); /* binfmt_aout */

diff --git a/fs/namespace.c b/fs/namespace.c
index 26380f599534b91e09fa4254c7c3c1c1fedaaad6..411728c0c8bb2b0ee1248d95106c32c1ad4ef36b 100644 (file)
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1130,27 +1130,27 @@ static int do_umount(struct vfsmount *mnt, int flags)
 
 asmlinkage long sys_umount(char __user * name, int flags)
 {
-       struct nameidata nd;
+       struct path path;
        int retval;
 
-       retval = __user_walk(name, LOOKUP_FOLLOW, &nd);
+       retval = user_path(name, &path);
        if (retval)
                goto out;
        retval = -EINVAL;
-       if (nd.path.dentry != nd.path.mnt->mnt_root)
+       if (path.dentry != path.mnt->mnt_root)
                goto dput_and_out;
-       if (!check_mnt(nd.path.mnt))
+       if (!check_mnt(path.mnt))
                goto dput_and_out;
 
        retval = -EPERM;
        if (!capable(CAP_SYS_ADMIN))
                goto dput_and_out;
 
-       retval = do_umount(nd.path.mnt, flags);
+       retval = do_umount(path.mnt, flags);
 dput_and_out:
        /* we mustn't call path_put() as that would clear mnt_expiry_mark */
-       dput(nd.path.dentry);
-       mntput_no_expire(nd.path.mnt);
+       dput(path.dentry);
+       mntput_no_expire(path.mnt);
 out:
        return retval;
 }
@@ -2179,28 +2179,26 @@ asmlinkage long sys_pivot_root(const char __user * new_root,
                               const char __user * put_old)
 {
        struct vfsmount *tmp;
-       struct nameidata new_nd, old_nd;
-       struct path parent_path, root_parent, root;
+       struct path new, old, parent_path, root_parent, root;
        int error;
 
        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;
 
-       error = __user_walk(new_root, LOOKUP_FOLLOW | LOOKUP_DIRECTORY,
-                           &new_nd);
+       error = user_path_dir(new_root, &new);
        if (error)
                goto out0;
        error = -EINVAL;
-       if (!check_mnt(new_nd.path.mnt))
+       if (!check_mnt(new.mnt))
                goto out1;
 
-       error = __user_walk(put_old, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &old_nd);
+       error = user_path_dir(put_old, &old);
        if (error)
                goto out1;
 
-       error = security_sb_pivotroot(&old_nd.path, &new_nd.path);
+       error = security_sb_pivotroot(&old, &new);
        if (error) {
-               path_put(&old_nd.path);
+               path_put(&old);
                goto out1;
        }
 
@@ -2209,69 +2207,69 @@ asmlinkage long sys_pivot_root(const char __user * new_root,
        path_get(&current->fs->root);
        read_unlock(&current->fs->lock);
        down_write(&namespace_sem);
-       mutex_lock(&old_nd.path.dentry->d_inode->i_mutex);
+       mutex_lock(&old.dentry->d_inode->i_mutex);
        error = -EINVAL;
-       if (IS_MNT_SHARED(old_nd.path.mnt) ||
-               IS_MNT_SHARED(new_nd.path.mnt->mnt_parent) ||
+       if (IS_MNT_SHARED(old.mnt) ||
+               IS_MNT_SHARED(new.mnt->mnt_parent) ||
                IS_MNT_SHARED(root.mnt->mnt_parent))
                goto out2;
        if (!check_mnt(root.mnt))
                goto out2;
        error = -ENOENT;
-       if (IS_DEADDIR(new_nd.path.dentry->d_inode))
+       if (IS_DEADDIR(new.dentry->d_inode))
                goto out2;
-       if (d_unhashed(new_nd.path.dentry) && !IS_ROOT(new_nd.path.dentry))
+       if (d_unhashed(new.dentry) && !IS_ROOT(new.dentry))
                goto out2;
-       if (d_unhashed(old_nd.path.dentry) && !IS_ROOT(old_nd.path.dentry))
+       if (d_unhashed(old.dentry) && !IS_ROOT(old.dentry))
                goto out2;
        error = -EBUSY;
-       if (new_nd.path.mnt == root.mnt ||
-           old_nd.path.mnt == root.mnt)
+       if (new.mnt == root.mnt ||
+           old.mnt == root.mnt)
                goto out2; /* loop, on the same file system  */
        error = -EINVAL;
        if (root.mnt->mnt_root != root.dentry)
                goto out2; /* not a mountpoint */
        if (root.mnt->mnt_parent == root.mnt)
                goto out2; /* not attached */
-       if (new_nd.path.mnt->mnt_root != new_nd.path.dentry)
+       if (new.mnt->mnt_root != new.dentry)
                goto out2; /* not a mountpoint */
-       if (new_nd.path.mnt->mnt_parent == new_nd.path.mnt)
+       if (new.mnt->mnt_parent == new.mnt)
                goto out2; /* not attached */
        /* make sure we can reach put_old from new_root */
-       tmp = old_nd.path.mnt;
+       tmp = old.mnt;
        spin_lock(&vfsmount_lock);
-       if (tmp != new_nd.path.mnt) {
+       if (tmp != new.mnt) {
                for (;;) {
                        if (tmp->mnt_parent == tmp)
                                goto out3; /* already mounted on put_old */
-                       if (tmp->mnt_parent == new_nd.path.mnt)
+                       if (tmp->mnt_parent == new.mnt)
                                break;
                        tmp = tmp->mnt_parent;
                }
-               if (!is_subdir(tmp->mnt_mountpoint, new_nd.path.dentry))
+               if (!is_subdir(tmp->mnt_mountpoint, new.dentry))
                        goto out3;
-       } else if (!is_subdir(old_nd.path.dentry, new_nd.path.dentry))
+       } else if (!is_subdir(old.dentry, new.dentry))
                goto out3;
-       detach_mnt(new_nd.path.mnt, &parent_path);
+       detach_mnt(new.mnt, &parent_path);
        detach_mnt(root.mnt, &root_parent);
        /* mount old root on put_old */
-       attach_mnt(root.mnt, &old_nd.path);
+       attach_mnt(root.mnt, &old);
        /* mount new_root on / */
-       attach_mnt(new_nd.path.mnt, &root_parent);
+       attach_mnt(new.mnt, &root_parent);
        touch_mnt_namespace(current->nsproxy->mnt_ns);
        spin_unlock(&vfsmount_lock);
-       chroot_fs_refs(&root, &new_nd.path);
-       security_sb_post_pivotroot(&root, &new_nd.path);
+       chroot_fs_refs(&root, &new);
+       security_sb_post_pivotroot(&root, &new);
        error = 0;
        path_put(&root_parent);
        path_put(&parent_path);
 out2:
-       mutex_unlock(&old_nd.path.dentry->d_inode->i_mutex);
+       mutex_unlock(&old.dentry->d_inode->i_mutex);
        up_write(&namespace_sem);
        path_put(&root);
-       path_put(&old_nd.path);
+       path_put(&old);
 out1:
-       path_put(&new_nd.path);
+       path_put(&new);
 out0:
        return error;
 out3:

diff --git a/fs/open.c b/fs/open.c
index e94266700eda26efea0fe57afd41b18f3b01e23d..3fe1a6857c751fa8dde9c08ef534d7a8f4dde2c9 100644 (file)
--- a/fs/open.c
+++ b/fs/open.c
@@ -122,37 +122,37 @@ static int vfs_statfs64(struct dentry *dentry, struct statfs64 *buf)
        return 0;
 }
 
-asmlinkage long sys_statfs(const char __user * path, struct statfs __user * buf)
+asmlinkage long sys_statfs(const char __user *pathname, struct statfs __user * buf)
 {
-       struct nameidata nd;
+       struct path path;
        int error;
 
-       error = user_path_walk(path, &nd);
+       error = user_path(pathname, &path);
        if (!error) {
                struct statfs tmp;
-               error = vfs_statfs_native(nd.path.dentry, &tmp);
+               error = vfs_statfs_native(path.dentry, &tmp);
                if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
                        error = -EFAULT;
-               path_put(&nd.path);
+               path_put(&path);
        }
        return error;
 }
 
 
-asmlinkage long sys_statfs64(const char __user *path, size_t sz, struct statfs64 __user *buf)
+asmlinkage long sys_statfs64(const char __user *pathname, size_t sz, struct statfs64 __user *buf)
 {
-       struct nameidata nd;
+       struct path path;
        long error;
 
        if (sz != sizeof(*buf))
                return -EINVAL;
-       error = user_path_walk(path, &nd);
+       error = user_path(pathname, &path);
        if (!error) {
                struct statfs64 tmp;
-               error = vfs_statfs64(nd.path.dentry, &tmp);
+               error = vfs_statfs64(path.dentry, &tmp);
                if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
                        error = -EFAULT;
-               path_put(&nd.path);
+               path_put(&path);
        }
        return error;
 }
@@ -223,20 +223,20 @@ int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
        return err;
 }
 
-static long do_sys_truncate(const char __user * path, loff_t length)
+static long do_sys_truncate(const char __user *pathname, loff_t length)
 {
-       struct nameidata nd;
-       struct inode * inode;
+       struct path path;
+       struct inode *inode;
        int error;
 
        error = -EINVAL;
        if (length < 0) /* sorry, but loff_t says... */
                goto out;
 
-       error = user_path_walk(path, &nd);
+       error = user_path(pathname, &path);
        if (error)
                goto out;
-       inode = nd.path.dentry->d_inode;
+       inode = path.dentry->d_inode;
 
        /* For directories it's -EISDIR, for other non-regulars - -EINVAL */
        error = -EISDIR;
@@ -247,7 +247,7 @@ static long do_sys_truncate(const char __user * path, loff_t length)
        if (!S_ISREG(inode->i_mode))
                goto dput_and_out;
 
-       error = mnt_want_write(nd.path.mnt);
+       error = mnt_want_write(path.mnt);
        if (error)
                goto dput_and_out;
 
@@ -274,15 +274,15 @@ static long do_sys_truncate(const char __user * path, loff_t length)
        error = locks_verify_truncate(inode, NULL, length);
        if (!error) {
                DQUOT_INIT(inode);
-               error = do_truncate(nd.path.dentry, length, 0, NULL);
+               error = do_truncate(path.dentry, length, 0, NULL);
        }
 
 put_write_and_out:
        put_write_access(inode);
 mnt_drop_write_and_out:
-       mnt_drop_write(nd.path.mnt);
+       mnt_drop_write(path.mnt);
 dput_and_out:
-       path_put(&nd.path);
+       path_put(&path);
 out:
        return error;
 }
@@ -425,7 +425,7 @@ out:
  */
 asmlinkage long sys_faccessat(int dfd, const char __user *filename, int mode)
 {
-       struct nameidata nd;
+       struct path path;
        struct inode *inode;
        int old_fsuid, old_fsgid;
        kernel_cap_t uninitialized_var(old_cap);  /* !SECURE_NO_SETUID_FIXUP */
@@ -449,7 +449,7 @@ asmlinkage long sys_faccessat(int dfd, const char __user *filename, int mode)
                 * FIXME: There is a race here against sys_capset.  The
                 * capabilities can change yet we will restore the old
                 * value below.  We should hold task_capabilities_lock,
-                * but we cannot because user_path_walk can sleep.
+                * but we cannot because user_path_at can sleep.
                 */
 #endif /* ndef CONFIG_SECURITY_FILE_CAPABILITIES */
                if (current->uid)
@@ -458,11 +458,11 @@ asmlinkage long sys_faccessat(int dfd, const char __user *filename, int mode)
                        old_cap = cap_set_effective(current->cap_permitted);
        }
 
-       res = __user_walk_fd(dfd, filename, LOOKUP_FOLLOW, &nd);
+       res = user_path_at(dfd, filename, LOOKUP_FOLLOW, &path);
        if (res)
                goto out;
 
-       inode = nd.path.dentry->d_inode;
+       inode = path.dentry->d_inode;
 
        if ((mode & MAY_EXEC) && S_ISREG(inode->i_mode)) {
                /*
@@ -470,7 +470,7 @@ asmlinkage long sys_faccessat(int dfd, const char __user *filename, int mode)
                 * with the "noexec" flag.
                 */
                res = -EACCES;
-               if (nd.path.mnt->mnt_flags & MNT_NOEXEC)
+               if (path.mnt->mnt_flags & MNT_NOEXEC)
                        goto out_path_release;
        }
 
@@ -488,11 +488,11 @@ asmlinkage long sys_faccessat(int dfd, const char __user *filename, int mode)
         * inherently racy and know that the fs may change
         * state before we even see this result.
         */
-       if (__mnt_is_readonly(nd.path.mnt))
+       if (__mnt_is_readonly(path.mnt))
                res = -EROFS;
 
 out_path_release:
-       path_put(&nd.path);
+       path_put(&path);
 out:
        current->fsuid = old_fsuid;
        current->fsgid = old_fsgid;
@@ -510,21 +510,21 @@ asmlinkage long sys_access(const char __user *filename, int mode)
 
 asmlinkage long sys_chdir(const char __user * filename)
 {
-       struct nameidata nd;
+       struct path path;
        int error;
 
-       error = __user_walk(filename, LOOKUP_FOLLOW|LOOKUP_DIRECTORY, &nd);
+       error = user_path_dir(filename, &path);
        if (error)
                goto out;
 
-       error = inode_permission(nd.path.dentry->d_inode, MAY_EXEC | MAY_ACCESS);
+       error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_ACCESS);
        if (error)
                goto dput_and_out;
 
-       set_fs_pwd(current->fs, &nd.path);
+       set_fs_pwd(current->fs, &path);
 
 dput_and_out:
-       path_put(&nd.path);
+       path_put(&path);
 out:
        return error;
 }
@@ -557,14 +557,14 @@ out:
 
 asmlinkage long sys_chroot(const char __user * filename)
 {
-       struct nameidata nd;
+       struct path path;
        int error;
 
-       error = __user_walk(filename, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &nd);
+       error = user_path_dir(filename, &path);
        if (error)
                goto out;
 
-       error = inode_permission(nd.path.dentry->d_inode, MAY_EXEC | MAY_ACCESS);
+       error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_ACCESS);
        if (error)
                goto dput_and_out;
 
@@ -572,10 +572,10 @@ asmlinkage long sys_chroot(const char __user * filename)
        if (!capable(CAP_SYS_CHROOT))
                goto dput_and_out;
 
-       set_fs_root(current->fs, &nd.path);
+       set_fs_root(current->fs, &path);
        error = 0;
 dput_and_out:
-       path_put(&nd.path);
+       path_put(&path);
 out:
        return error;
 }
@@ -617,17 +617,17 @@ out:
 asmlinkage long sys_fchmodat(int dfd, const char __user *filename,
                             mode_t mode)
 {
-       struct nameidata nd;
-       struct inode * inode;
+       struct path path;
+       struct inode *inode;
        int error;
        struct iattr newattrs;
 
-       error = __user_walk_fd(dfd, filename, LOOKUP_FOLLOW, &nd);
+       error = user_path_at(dfd, filename, LOOKUP_FOLLOW, &path);
        if (error)
                goto out;
-       inode = nd.path.dentry->d_inode;
+       inode = path.dentry->d_inode;
 
-       error = mnt_want_write(nd.path.mnt);
+       error = mnt_want_write(path.mnt);
        if (error)
                goto dput_and_out;
        mutex_lock(&inode->i_mutex);
@@ -635,11 +635,11 @@ asmlinkage long sys_fchmodat(int dfd, const char __user *filename,
                mode = inode->i_mode;
        newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
        newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
-       error = notify_change(nd.path.dentry, &newattrs);
+       error = notify_change(path.dentry, &newattrs);
        mutex_unlock(&inode->i_mutex);
-       mnt_drop_write(nd.path.mnt);
+       mnt_drop_write(path.mnt);
 dput_and_out:
-       path_put(&nd.path);
+       path_put(&path);
 out:
        return error;
 }
@@ -676,19 +676,19 @@ static int chown_common(struct dentry * dentry, uid_t user, gid_t group)
 
 asmlinkage long sys_chown(const char __user * filename, uid_t user, gid_t group)
 {
-       struct nameidata nd;
+       struct path path;
        int error;
 
-       error = user_path_walk(filename, &nd);
+       error = user_path(filename, &path);
        if (error)
                goto out;
-       error = mnt_want_write(nd.path.mnt);
+       error = mnt_want_write(path.mnt);
        if (error)
                goto out_release;
-       error = chown_common(nd.path.dentry, user, group);
-       mnt_drop_write(nd.path.mnt);
+       error = chown_common(path.dentry, user, group);
+       mnt_drop_write(path.mnt);
 out_release:
-       path_put(&nd.path);
+       path_put(&path);
 out:
        return error;
 }
@@ -696,7 +696,7 @@ out:
 asmlinkage long sys_fchownat(int dfd, const char __user *filename, uid_t user,
                             gid_t group, int flag)
 {
-       struct nameidata nd;
+       struct path path;
        int error = -EINVAL;
        int follow;
 
@@ -704,35 +704,35 @@ asmlinkage long sys_fchownat(int dfd, const char __user *filename, uid_t user,
                goto out;
 
        follow = (flag & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW;
-       error = __user_walk_fd(dfd, filename, follow, &nd);
+       error = user_path_at(dfd, filename, follow, &path);
        if (error)
                goto out;
-       error = mnt_want_write(nd.path.mnt);
+       error = mnt_want_write(path.mnt);
        if (error)
                goto out_release;
-       error = chown_common(nd.path.dentry, user, group);
-       mnt_drop_write(nd.path.mnt);
+       error = chown_common(path.dentry, user, group);
+       mnt_drop_write(path.mnt);
 out_release:
-       path_put(&nd.path);
+       path_put(&path);
 out:
        return error;
 }
 
 asmlinkage long sys_lchown(const char __user * filename, uid_t user, gid_t group)
 {
-       struct nameidata nd;
+       struct path path;
        int error;
 
-       error = user_path_walk_link(filename, &nd);
+       error = user_lpath(filename, &path);
        if (error)
                goto out;
-       error = mnt_want_write(nd.path.mnt);
+       error = mnt_want_write(path.mnt);
        if (error)
                goto out_release;
-       error = chown_common(nd.path.dentry, user, group);
-       mnt_drop_write(nd.path.mnt);
+       error = chown_common(path.dentry, user, group);
+       mnt_drop_write(path.mnt);
 out_release:
-       path_put(&nd.path);
+       path_put(&path);
 out:
        return error;
 }

diff --git a/fs/stat.c b/fs/stat.c
index 9cf41f719d50d18adf2fca7a6582b0ecfdc506aa..7c46fbeb8b762e0f125a594a6fd27747ff160c55 100644 (file)
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -57,13 +57,13 @@ EXPORT_SYMBOL(vfs_getattr);
 
 int vfs_stat_fd(int dfd, char __user *name, struct kstat *stat)
 {
-       struct nameidata nd;
+       struct path path;
        int error;
 
-       error = __user_walk_fd(dfd, name, LOOKUP_FOLLOW, &nd);
+       error = user_path_at(dfd, name, LOOKUP_FOLLOW, &path);
        if (!error) {
-               error = vfs_getattr(nd.path.mnt, nd.path.dentry, stat);
-               path_put(&nd.path);
+               error = vfs_getattr(path.mnt, path.dentry, stat);
+               path_put(&path);
        }
        return error;
 }
@@ -77,13 +77,13 @@ EXPORT_SYMBOL(vfs_stat);
 
 int vfs_lstat_fd(int dfd, char __user *name, struct kstat *stat)
 {
-       struct nameidata nd;
+       struct path path;
        int error;
 
-       error = __user_walk_fd(dfd, name, 0, &nd);
+       error = user_path_at(dfd, name, 0, &path);
        if (!error) {
-               error = vfs_getattr(nd.path.mnt, nd.path.dentry, stat);
-               path_put(&nd.path);
+               error = vfs_getattr(path.mnt, path.dentry, stat);
+               path_put(&path);
        }
        return error;
 }
@@ -291,29 +291,29 @@ asmlinkage long sys_newfstat(unsigned int fd, struct stat __user *statbuf)
        return error;
 }
 
-asmlinkage long sys_readlinkat(int dfd, const char __user *path,
+asmlinkage long sys_readlinkat(int dfd, const char __user *pathname,
                                char __user *buf, int bufsiz)
 {
-       struct nameidata nd;
+       struct path path;
        int error;
 
        if (bufsiz <= 0)
                return -EINVAL;
 
-       error = __user_walk_fd(dfd, path, 0, &nd);
+       error = user_path_at(dfd, pathname, 0, &path);
        if (!error) {
-               struct inode *inode = nd.path.dentry->d_inode;
+               struct inode *inode = path.dentry->d_inode;
 
                error = -EINVAL;
                if (inode->i_op && inode->i_op->readlink) {
-                       error = security_inode_readlink(nd.path.dentry);
+                       error = security_inode_readlink(path.dentry);
                        if (!error) {
-                               touch_atime(nd.path.mnt, nd.path.dentry);
-                               error = inode->i_op->readlink(nd.path.dentry,
+                               touch_atime(path.mnt, path.dentry);
+                               error = inode->i_op->readlink(path.dentry,
                                                              buf, bufsiz);
                        }
                }
-               path_put(&nd.path);
+               path_put(&path);
        }
        return error;
 }

diff --git a/fs/utimes.c b/fs/utimes.c
index dc28b7826259f92557f358341b1a7b275e90c666..6929e3e91d0579d28c6cd4453554a4c559236736 100644 (file)
--- a/fs/utimes.c
+++ b/fs/utimes.c
@@ -152,18 +152,18 @@ long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags
                error = utimes_common(&file->f_path, times);
                fput(file);
        } else {
-               struct nameidata nd;
+               struct path path;
                int lookup_flags = 0;
 
                if (!(flags & AT_SYMLINK_NOFOLLOW))
                        lookup_flags |= LOOKUP_FOLLOW;
 
-               error = __user_walk_fd(dfd, filename, lookup_flags, &nd);
+               error = user_path_at(dfd, filename, lookup_flags, &path);
                if (error)
                        goto out;
 
-               error = utimes_common(&nd.path, times);
-               path_put(&nd.path);
+               error = utimes_common(&path, times);
+               path_put(&path);
        }
 
 out:

diff --git a/fs/xattr.c b/fs/xattr.c
index b96222e05ba0a918a0bb4f1a790a1c08c200400f..468377e665314434fd4f5aa6fe407f50a68096fc 100644 (file)
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -252,40 +252,40 @@ setxattr(struct dentry *d, const char __user *name, const void __user *value,
 }
 
 asmlinkage long
-sys_setxattr(const char __user *path, const char __user *name,
+sys_setxattr(const char __user *pathname, const char __user *name,
             const void __user *value, size_t size, int flags)
 {
-       struct nameidata nd;
+       struct path path;
        int error;
 
-       error = user_path_walk(path, &nd);
+       error = user_path(pathname, &path);
        if (error)
                return error;
-       error = mnt_want_write(nd.path.mnt);
+       error = mnt_want_write(path.mnt);
        if (!error) {
-               error = setxattr(nd.path.dentry, name, value, size, flags);
-               mnt_drop_write(nd.path.mnt);
+               error = setxattr(path.dentry, name, value, size, flags);
+               mnt_drop_write(path.mnt);
        }
-       path_put(&nd.path);
+       path_put(&path);
        return error;
 }
 
 asmlinkage long
-sys_lsetxattr(const char __user *path, const char __user *name,
+sys_lsetxattr(const char __user *pathname, const char __user *name,
              const void __user *value, size_t size, int flags)
 {
-       struct nameidata nd;
+       struct path path;
        int error;
 
-       error = user_path_walk_link(path, &nd);
+       error = user_lpath(pathname, &path);
        if (error)
                return error;
-       error = mnt_want_write(nd.path.mnt);
+       error = mnt_want_write(path.mnt);
        if (!error) {
-               error = setxattr(nd.path.dentry, name, value, size, flags);
-               mnt_drop_write(nd.path.mnt);
+               error = setxattr(path.dentry, name, value, size, flags);
+               mnt_drop_write(path.mnt);
        }
-       path_put(&nd.path);
+       path_put(&path);
        return error;
 }
 
@@ -350,32 +350,32 @@ getxattr(struct dentry *d, const char __user *name, void __user *value,
 }
 
 asmlinkage ssize_t
-sys_getxattr(const char __user *path, const char __user *name,
+sys_getxattr(const char __user *pathname, const char __user *name,
             void __user *value, size_t size)
 {
-       struct nameidata nd;
+       struct path path;
        ssize_t error;
 
-       error = user_path_walk(path, &nd);
+       error = user_path(pathname, &path);
        if (error)
                return error;
-       error = getxattr(nd.path.dentry, name, value, size);
-       path_put(&nd.path);
+       error = getxattr(path.dentry, name, value, size);
+       path_put(&path);
        return error;
 }
 
 asmlinkage ssize_t
-sys_lgetxattr(const char __user *path, const char __user *name, void __user *value,
+sys_lgetxattr(const char __user *pathname, const char __user *name, void __user *value,
              size_t size)
 {
-       struct nameidata nd;
+       struct path path;
        ssize_t error;
 
-       error = user_path_walk_link(path, &nd);
+       error = user_lpath(pathname, &path);
        if (error)
                return error;
-       error = getxattr(nd.path.dentry, name, value, size);
-       path_put(&nd.path);
+       error = getxattr(path.dentry, name, value, size);
+       path_put(&path);
        return error;
 }
 
@@ -425,30 +425,30 @@ listxattr(struct dentry *d, char __user *list, size_t size)
 }
 
 asmlinkage ssize_t
-sys_listxattr(const char __user *path, char __user *list, size_t size)
+sys_listxattr(const char __user *pathname, char __user *list, size_t size)
 {
-       struct nameidata nd;
+       struct path path;
        ssize_t error;
 
-       error = user_path_walk(path, &nd);
+       error = user_path(pathname, &path);
        if (error)
                return error;
-       error = listxattr(nd.path.dentry, list, size);
-       path_put(&nd.path);
+       error = listxattr(path.dentry, list, size);
+       path_put(&path);
        return error;
 }
 
 asmlinkage ssize_t
-sys_llistxattr(const char __user *path, char __user *list, size_t size)
+sys_llistxattr(const char __user *pathname, char __user *list, size_t size)
 {
-       struct nameidata nd;
+       struct path path;
        ssize_t error;
 
-       error = user_path_walk_link(path, &nd);
+       error = user_lpath(pathname, &path);
        if (error)
                return error;
-       error = listxattr(nd.path.dentry, list, size);
-       path_put(&nd.path);
+       error = listxattr(path.dentry, list, size);
+       path_put(&path);
        return error;
 }
 
@@ -486,38 +486,38 @@ removexattr(struct dentry *d, const char __user *name)
 }
 
 asmlinkage long
-sys_removexattr(const char __user *path, const char __user *name)
+sys_removexattr(const char __user *pathname, const char __user *name)
 {
-       struct nameidata nd;
+       struct path path;
        int error;
 
-       error = user_path_walk(path, &nd);
+       error = user_path(pathname, &path);
        if (error)
                return error;
-       error = mnt_want_write(nd.path.mnt);
+       error = mnt_want_write(path.mnt);
        if (!error) {
-               error = removexattr(nd.path.dentry, name);
-               mnt_drop_write(nd.path.mnt);
+               error = removexattr(path.dentry, name);
+               mnt_drop_write(path.mnt);
        }
-       path_put(&nd.path);
+       path_put(&path);
        return error;
 }
 
 asmlinkage long
-sys_lremovexattr(const char __user *path, const char __user *name)
+sys_lremovexattr(const char __user *pathname, const char __user *name)
 {
-       struct nameidata nd;
+       struct path path;
        int error;
 
-       error = user_path_walk_link(path, &nd);
+       error = user_lpath(pathname, &path);
        if (error)
                return error;
-       error = mnt_want_write(nd.path.mnt);
+       error = mnt_want_write(path.mnt);
        if (!error) {
-               error = removexattr(nd.path.dentry, name);
-               mnt_drop_write(nd.path.mnt);
+               error = removexattr(path.dentry, name);
+               mnt_drop_write(path.mnt);
        }
-       path_put(&nd.path);
+       path_put(&path);
        return error;
 }
 

diff --git a/fs/xfs/linux-2.6/xfs_ioctl.c b/fs/xfs/linux-2.6/xfs_ioctl.c
index a42ba9d71156f84101e1068a33d4bd05e055bcd9..01939ba2d8dea65c43b04b0754b9df4513e8864e 100644 (file)
--- a/fs/xfs/linux-2.6/xfs_ioctl.c
+++ b/fs/xfs/linux-2.6/xfs_ioctl.c
@@ -84,17 +84,15 @@ xfs_find_handle(
        switch (cmd) {
        case XFS_IOC_PATH_TO_FSHANDLE:
        case XFS_IOC_PATH_TO_HANDLE: {
-               struct nameidata        nd;
-               int                     error;
-
-               error = user_path_walk_link((const char __user *)hreq.path, &nd);
+               struct path path;
+               int error = user_lpath((const char __user *)hreq.path, &path);
                if (error)
                        return error;
 
-               ASSERT(nd.path.dentry);
-               ASSERT(nd.path.dentry->d_inode);
-               inode = igrab(nd.path.dentry->d_inode);
-               path_put(&nd.path);
+               ASSERT(path.dentry);
+               ASSERT(path.dentry->d_inode);
+               inode = igrab(path.dentry->d_inode);
+               path_put(&path);
                break;
        }
 

diff --git a/include/linux/namei.h b/include/linux/namei.h
index 60e35a02f6cb4cd6a48cfb6c7902d3e58b154fa5..00888ff69504aa98d7a6b31e779625113d38e3fa 100644 (file)
--- a/include/linux/namei.h
+++ b/include/linux/namei.h
@@ -54,12 +54,13 @@ enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
 #define LOOKUP_OPEN            (0x0100)
 #define LOOKUP_CREATE          (0x0200)
 
-extern int __user_walk(const char __user *, unsigned, struct nameidata *);
-extern int __user_walk_fd(int dfd, const char __user *, unsigned, struct nameidata *);
-#define user_path_walk(name,nd) \
-       __user_walk_fd(AT_FDCWD, name, LOOKUP_FOLLOW, nd)
-#define user_path_walk_link(name,nd) \
-       __user_walk_fd(AT_FDCWD, name, 0, nd)
+extern int user_path_at(int, const char __user *, unsigned, struct path *);
+
+#define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path)
+#define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path)
+#define user_path_dir(name, path) \
+       user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path)
+
 extern int path_lookup(const char *, unsigned, struct nameidata *);
 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
                           const char *, unsigned int, struct nameidata *);