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ext4: Make sure the MOVE_EXT ioctl can't overwrite append-only files
authorTheodore Ts'o <tytso@mit.edu>
Thu, 3 Jun 2010 02:04:39 +0000 (22:04 -0400)
committerGreg Kroah-Hartman <gregkh@suse.de>
Fri, 13 Aug 2010 20:20:18 +0000 (13:20 -0700)
commitc60ca6232164fc6abea21bcf3f58172607f491e5
tree4fcbb257c3ad052c40b10a19567ae8cf6c3a4017tree | snapshot
parenta234580f5c847eaa59e775469205734c5d94e846commit | diff
ext4: Make sure the MOVE_EXT ioctl can't overwrite append-only files

commit 1f5a81e41f8b1a782c68d3843e9ec1bfaadf7d72 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
fs/ext4/move_extent.c diff | blob | history
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