aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorJeff Mahoney <jeffm@suse.com>2013-05-31 15:54:17 -0400
committerJan Kara <jack@suse.cz>2013-05-31 23:14:11 +0200
commit4a8570112b76a63ad21cfcbe2783f98f7fd5ba1b (patch)
treee2009e9a11575062ed38fa464ea03801aa2c5594
parent0bdc7acba56a7ca4232f15f37b16f7ec079385ab (diff)
downloadlinux-4a8570112b76a63ad21cfcbe2783f98f7fd5ba1b.tar.gz
reiserfs: fix problems with chowning setuid file w/ xattrs
reiserfs_chown_xattrs() takes the iattr struct passed into ->setattr and uses it to iterate over all the attrs associated with a file to change ownership of xattrs (and transfer quota associated with the xattr files). When the setuid bit is cleared during chown, ATTR_MODE and iattr->ia_mode are passed to all the xattrs as well. This means that the xattr directory will have S_IFREG added to its mode bits. This has been prevented in practice by a missing IS_PRIVATE check in reiserfs_acl_chmod, which caused a double-lock to occur while holding the write lock. Since the file system was completely locked up, the writeout of the corrupted mode never happened. This patch temporarily clears everything but ATTR_UID|ATTR_GID for the calls to reiserfs_setattr and adds the missing IS_PRIVATE check. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Jan Kara <jack@suse.cz>
-rw-r--r--fs/reiserfs/xattr.c14
-rw-r--r--fs/reiserfs/xattr_acl.c3
2 files changed, 16 insertions, 1 deletions
diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c
index 4cce1d9552f..821bcf70e46 100644
--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -318,7 +318,19 @@ static int delete_one_xattr(struct dentry *dentry, void *data)
static int chown_one_xattr(struct dentry *dentry, void *data)
{
struct iattr *attrs = data;
- return reiserfs_setattr(dentry, attrs);
+ int ia_valid = attrs->ia_valid;
+ int err;
+
+ /*
+ * We only want the ownership bits. Otherwise, we'll do
+ * things like change a directory to a regular file if
+ * ATTR_MODE is set.
+ */
+ attrs->ia_valid &= (ATTR_UID|ATTR_GID);
+ err = reiserfs_setattr(dentry, attrs);
+ attrs->ia_valid = ia_valid;
+
+ return err;
}
/* No i_mutex, but the inode is unconnected. */
diff --git a/fs/reiserfs/xattr_acl.c b/fs/reiserfs/xattr_acl.c
index d7c01ef64ed..6c8767fdfc6 100644
--- a/fs/reiserfs/xattr_acl.c
+++ b/fs/reiserfs/xattr_acl.c
@@ -443,6 +443,9 @@ int reiserfs_acl_chmod(struct inode *inode)
int depth;
int error;
+ if (IS_PRIVATE(inode))
+ return 0;
+
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;