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ext4: Make sure the MOVE_EXT ioctl can't overwrite append-only files 

Dan Roseberg has reported a problem with the MOVE_EXT ioctl.  If the
donor file is an append-only file, we should not allow the operation
to proceed, lest we end up overwriting the contents of an append-only
file.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: Dan Rosenberg <dan.j.rosenberg@gmail.com>
This commit is contained in:
Theodore Ts'o 2010-06-02 22:04:39 -04:00
parent 67a3e12b05
commit 1f5a81e41f
1 changed files with 3 additions and 0 deletions
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3
fs/ext4/move_extent.c
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@ -960,6 +960,9 @@ mext_check_arguments(struct inode *orig_inode,
return -EINVAL; return -EINVAL;
} }
if (IS_IMMUTABLE(donor_inode) || IS_APPEND(donor_inode))
return -EPERM;
/* Ext4 move extent does not support swapfile */ /* Ext4 move extent does not support swapfile */
if (IS_SWAPFILE(orig_inode) || IS_SWAPFILE(donor_inode)) { if (IS_SWAPFILE(orig_inode) || IS_SWAPFILE(donor_inode)) {
ext4_debug("ext4 move extent: The argument files should " ext4_debug("ext4 move extent: The argument files should "