From ad7bb5f61195bea3622db652bea66b5cc56c4fe3 Mon Sep 17 00:00:00 2001
From: Yiannis Pericleous <yiannos@louie.fsl.cs.sunysb.edu>
Date: Sat, 5 May 2007 16:33:52 -0400
Subject: [PATCH] permission related bugfixes

---
 fs/unionfs/odf.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/fs/unionfs/odf.c b/fs/unionfs/odf.c
index 21b2d91abc..741e32efc1 100644
--- a/fs/unionfs/odf.c
+++ b/fs/unionfs/odf.c
@@ -349,6 +349,8 @@ int odf_rename(struct dentry *old_dentry, struct dentry *new_dentry)
 	struct dentry *old_dir, *new_dir;
 	struct dentry *old_odfdentry, *new_odfdentry;
 	int err = 0;
+	uid_t olduid = current->fsuid;
+	gid_t oldgid = current->fsgid;
 
 	err = odf_lookup(old_dentry->d_parent, old_dentry, 0);
 	if (err)
@@ -387,10 +389,14 @@ int odf_rename(struct dentry *old_dentry, struct dentry *new_dentry)
 	BUG_ON(new_odfdentry->d_inode);
 
 	lock_rename(old_dir, new_dir);
+	current->fsuid = 0;
+	current->fsgid = 0;
 	err = vfs_rename(old_dir->d_inode,
 			old_odfdentry, new_dir->d_inode,
 			new_odfdentry);
 	unlock_rename(old_dir, new_dir);
+	current->fsuid = olduid;
+	current->fsgid = oldgid;
 	dput(new_odfdentry);
 
 out_unlock:
@@ -407,6 +413,8 @@ int odf_link(struct dentry *old_dentry, struct dentry *new_dentry)
 	struct dentry *old_dir, *new_dir;
 	struct dentry *old_odfdentry, *new_odfdentry;
 	int err = 0;
+	uid_t olduid = current->fsuid;
+	gid_t oldgid = current->fsgid;
 
 	err = odf_lookup(old_dentry->d_parent, old_dentry, 0);
 	if (err)
@@ -438,7 +446,11 @@ int odf_link(struct dentry *old_dentry, struct dentry *new_dentry)
 	/* this should never happen */
 	BUG_ON(new_odfdentry->d_inode);
 
+	current->fsuid = 0;
+	current->fsgid = 0;
 	err = vfs_link(old_odfdentry, old_dir->d_inode, new_odfdentry);
+	current->fsuid = olduid;
+	current->fsgid = oldgid;
 
 	dput(new_odfdentry);
 out_unlock:
@@ -1246,6 +1258,8 @@ int odf_purge_dir_cache(struct dentry *dentry)
 {
 	int err = 0;
 	struct odf_dentry_info *odi = NULL;
+	uid_t olduid = current->fsuid;
+	gid_t oldgid = current->fsgid;
 
 	odi = odf_ic_cache_dentry(dentry);
 	if (IS_ERR(odi)){
@@ -1253,7 +1267,12 @@ int odf_purge_dir_cache(struct dentry *dentry)
 		odi = NULL;
 		goto out;
 	}
+
+	current->fsuid = 0;
+	current->fsgid = 0;
 	err = vfs_unlink(odi->dentry->d_parent->d_inode, odi->dentry);
+	current->fsuid = olduid;
+	current->fsgid = oldgid;
 out:
 	odf_put_info(odi);
 	return err;
@@ -1299,6 +1318,11 @@ int odf_remove(struct dentry *dentry, int flags)
 	struct odf_dentry_info *odf_dir;
 	struct odf_dentry_info *odi = NULL;
 	int err = 0, rmv = 0;
+	uid_t olduid = current->fsuid;
+	gid_t oldgid = current->fsgid;
+
+	olduid = current->fsuid;
+	oldgid = current->fsgid;
 
 	/* refresh odi */
 	err = odf_lookup(dentry->d_parent, dentry, 0);
@@ -1327,10 +1351,14 @@ int odf_remove(struct dentry *dentry, int flags)
 	odf_lock(odf_dir);
 
 	/* remove */
+	current->fsuid = 0;
+	current->fsgid = 0;
 	if (S_ISDIR(odi->dentry->d_inode->i_mode))
 		err = odf_reclaim(dentry);
 	else
 		err = vfs_unlink(odi->dentry->d_parent->d_inode, odi->dentry);
+	current->fsuid = olduid;
+	current->fsgid = oldgid;
 	if (err)
 		goto out_unlock;
 
-- 
2.43.0