The patch titled
Forbid user to change file flags on quota files
has been added to the -mm tree. Its filename is
forbid-user-to-change-file-flags-on-quota-files.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: Forbid user to change file flags on quota files
From: Jan Kara <jack@xxxxxxx>
Forbid user from changing file flags on quota files. User has no bussiness
in playing with these flags when quota is on. Furthermore there is a
remote possibility of deadlock due to a lock inversion between quota file's
i_mutex and transaction's start (i_mutex for quota file is locked only when
trasaction is started in quota operations) in ext3 and ext4.
Signed-off-by: Jan Kara <jack@xxxxxxx>
Cc: LIOU Payphone <lioupayphone@xxxxxxxxx>
Cc: <linux-ext4@xxxxxxxxxxxxxxx>
Cc: Dave Kleikamp <shaggy@xxxxxxxxxxxxxx>
Cc: <reiserfs-dev@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/ext2/ioctl.c | 5 +++++
fs/ext3/ioctl.c | 5 +++++
fs/ext4/ioctl.c | 5 +++++
fs/jfs/ioctl.c | 3 +++
fs/reiserfs/ioctl.c | 3 +++
5 files changed, 21 insertions(+)
diff -puN fs/ext2/ioctl.c~forbid-user-to-change-file-flags-on-quota-files fs/ext2/ioctl.c
--- a/fs/ext2/ioctl.c~forbid-user-to-change-file-flags-on-quota-files
+++ a/fs/ext2/ioctl.c
@@ -47,6 +47,11 @@ int ext2_ioctl (struct inode * inode, st
flags &= ~EXT2_DIRSYNC_FL;
mutex_lock(&inode->i_mutex);
+ /* Is it quota file? Don't allow user mess with it */
+ if (IS_NOQUOTA(inode)) {
+ mutex_unlock(&inode->i_mutex);
+ return -EPERM;
+ }
oldflags = ei->i_flags;
/*
diff -puN fs/ext3/ioctl.c~forbid-user-to-change-file-flags-on-quota-files fs/ext3/ioctl.c
--- a/fs/ext3/ioctl.c~forbid-user-to-change-file-flags-on-quota-files
+++ a/fs/ext3/ioctl.c
@@ -51,6 +51,11 @@ int ext3_ioctl (struct inode * inode, st
flags &= ~EXT3_DIRSYNC_FL;
mutex_lock(&inode->i_mutex);
+ /* Is it quota file? Don't allow user mess with it */
+ if (IS_NOQUOTA(inode)) {
+ mutex_unlock(&inode->i_mutex);
+ return -EPERM;
+ }
oldflags = ei->i_flags;
/* The JOURNAL_DATA flag is modifiable only by root */
diff -puN fs/ext4/ioctl.c~forbid-user-to-change-file-flags-on-quota-files fs/ext4/ioctl.c
--- a/fs/ext4/ioctl.c~forbid-user-to-change-file-flags-on-quota-files
+++ a/fs/ext4/ioctl.c
@@ -51,6 +51,11 @@ int ext4_ioctl (struct inode * inode, st
flags &= ~EXT4_DIRSYNC_FL;
mutex_lock(&inode->i_mutex);
+ /* Is it quota file? Don't allow user mess with it */
+ if (IS_NOQUOTA(inode)) {
+ mutex_unlock(&inode->i_mutex);
+ return -EPERM;
+ }
oldflags = ei->i_flags;
/* The JOURNAL_DATA flag is modifiable only by root */
diff -puN fs/jfs/ioctl.c~forbid-user-to-change-file-flags-on-quota-files fs/jfs/ioctl.c
--- a/fs/jfs/ioctl.c~forbid-user-to-change-file-flags-on-quota-files
+++ a/fs/jfs/ioctl.c
@@ -79,6 +79,9 @@ int jfs_ioctl(struct inode * inode, stru
if (!S_ISDIR(inode->i_mode))
flags &= ~JFS_DIRSYNC_FL;
+ /* Is it quota file? Don't allow user mess with it */
+ if (IS_NOQUOTA(inode))
+ return -EPERM;
jfs_get_inode_flags(jfs_inode);
oldflags = jfs_inode->mode2;
diff -puN fs/reiserfs/ioctl.c~forbid-user-to-change-file-flags-on-quota-files fs/reiserfs/ioctl.c
--- a/fs/reiserfs/ioctl.c~forbid-user-to-change-file-flags-on-quota-files
+++ a/fs/reiserfs/ioctl.c
@@ -57,6 +57,9 @@ int reiserfs_ioctl(struct inode *inode,
if (get_user(flags, (int __user *)arg))
return -EFAULT;
+ /* Is it quota file? Don't allow user mess with it. */
+ if (IS_NOQUOTA(inode))
+ return -EPERM;
if (((flags ^ REISERFS_I(inode)->
i_attrs) & (REISERFS_IMMUTABLE_FL |
REISERFS_APPEND_FL))
_
Patches currently in -mm which might be from jack@xxxxxxx are
forbid-user-to-change-file-flags-on-quota-files.patch
git-ocfs2.patch
fix-64kb-blocksize-in-ext3-directories.patch
fix-64kb-blocksize-in-ext3-directories-checkpatch-fixes.patch
iget-stop-ext3-from-using-iget-and-read_inode-try.patch
iget-stop-ext3-from-using-iget-and-read_inode-try-checkpatch-fixes.patch
iget-stop-ext4-from-using-iget-and-read_inode-try.patch
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