[PATCH 2/5] fs: Rename file_remove_suid() to file_remove_privs()

From: Jan Kara <jack@suse.cz>
To: Al Viro <viro@ZenIV.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org, xfs@oss.sgi.com, Jan Kara <jack@suse.cz>
Subject: [PATCH 2/5] fs: Rename file_remove_suid() to file_remove_privs()
Date: Tue,  3 Mar 2015 11:38:36 +0100	[thread overview]
Message-ID: <1425379119-3773-3-git-send-email-jack@suse.cz> (raw)
In-Reply-To: <1425379119-3773-1-git-send-email-jack@suse.cz>

file_remove_suid() is a misnomer since it removes also security related
xattrs and sets S_NOSEC flag. Also should_remove_suid() tells something
else than whether file_remove_suid() call is necessary which leads to
bugs.

Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/btrfs/file.c    |  2 +-
 fs/ceph/file.c     |  2 +-
 fs/fuse/file.c     |  2 +-
 fs/inode.c         | 13 ++++++++-----
 fs/ntfs/file.c     |  2 +-
 fs/xfs/xfs_file.c  |  2 +-
 include/linux/fs.h |  2 +-
 mm/filemap.c       |  2 +-
 8 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index b78bbbac900d..c693dc2136e1 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1760,7 +1760,7 @@ static ssize_t btrfs_file_write_iter(struct kiocb *iocb,
 
 	iov_iter_truncate(from, count);
 
-	err = file_remove_suid(file);
+	err = file_remove_privs(file);
 	if (err) {
 		mutex_unlock(&inode->i_mutex);
 		goto out;
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index d533075a823d..493f293d433e 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -962,7 +962,7 @@ static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
 		goto out;
 	iov_iter_truncate(from, count);
 
-	err = file_remove_suid(file);
+	err = file_remove_privs(file);
 	if (err)
 		goto out;
 
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index c01ec3bdcfd8..3e2ede73a3e3 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1169,7 +1169,7 @@ static ssize_t fuse_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 		goto out;
 
 	iov_iter_truncate(from, count);
-	err = file_remove_suid(file);
+	err = file_remove_privs(file);
 	if (err)
 		goto out;
 
diff --git a/fs/inode.c b/fs/inode.c
index be326ae7f880..bc5fe06b8784 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1672,7 +1672,11 @@ static int __remove_suid(struct dentry *dentry, int kill)
 	return notify_change(dentry, &newattrs, NULL);
 }
 
-int file_remove_suid(struct file *file)
+/*
+ * Remove special file priviledges (suid, security tags) when file is written
+ * to or truncated.
+ */
+int file_remove_privs(struct file *file)
 {
 	struct dentry *dentry = file->f_path.dentry;
 	struct inode *inode = dentry->d_inode;
@@ -1699,7 +1703,7 @@ int file_remove_suid(struct file *file)
 
 	return error;
 }
-EXPORT_SYMBOL(file_remove_suid);
+EXPORT_SYMBOL(file_remove_privs);
 
 /**
  *	file_update_time	-	update mtime and ctime time
@@ -1968,9 +1972,8 @@ EXPORT_SYMBOL(inode_dio_done);
  * inode is being instantiated).  The reason for the cmpxchg() loop
  * --- which wouldn't be necessary if all code paths which modify
  * i_flags actually followed this rule, is that there is at least one
- * code path which doesn't today --- for example,
- * __generic_file_aio_write() calls file_remove_suid() without holding
- * i_mutex --- so we use cmpxchg() out of an abundance of caution.
+ * code path which doesn't today so we use cmpxchg() out of an abundance
+ * of caution.
  *
  * In the long run, i_mutex is overkill, and we should probably look
  * at using the i_lock spinlock to protect i_flags, and then make sure
diff --git a/fs/ntfs/file.c b/fs/ntfs/file.c
index 1da9b2d184dc..008a476558d3 100644
--- a/fs/ntfs/file.c
+++ b/fs/ntfs/file.c
@@ -2099,7 +2099,7 @@ static ssize_t ntfs_file_aio_write_nolock(struct kiocb *iocb,
 		goto out;
 	if (!count)
 		goto out;
-	err = file_remove_suid(file);
+	err = file_remove_privs(file);
 	if (err)
 		goto out;
 	err = file_update_time(file);
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index a2e1cb8a568b..fa81a43702ee 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -601,7 +601,7 @@ restart:
 	 * setgid bits if the process is not being run by root.  This keeps
 	 * people from modifying setuid and setgid binaries.
 	 */
-	return file_remove_suid(file);
+	return file_remove_privs(file);
 }
 
 /*
diff --git a/include/linux/fs.h b/include/linux/fs.h
index b4d71b5e1ff2..676e431247bd 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2517,7 +2517,7 @@ extern struct inode *new_inode_pseudo(struct super_block *sb);
 extern struct inode *new_inode(struct super_block *sb);
 extern void free_inode_nonrcu(struct inode *inode);
 extern int should_remove_suid(struct dentry *);
-extern int file_remove_suid(struct file *);
+extern int file_remove_privs(struct file *);
 
 extern void __insert_inode_hash(struct inode *, unsigned long hashval);
 static inline void insert_inode_hash(struct inode *inode)
diff --git a/mm/filemap.c b/mm/filemap.c
index ad7242043bdb..ac021d604b1e 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2575,7 +2575,7 @@ ssize_t __generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 
 	iov_iter_truncate(from, count);
 
-	err = file_remove_suid(file);
+	err = file_remove_privs(file);
 	if (err)
 		goto out;
 
-- 
2.1.4

