Re: [reiserfs-list] major security bug in reiserfs (may affect SuSE Linux)

Chris Mason
2001-01-10T15:49:30Z

On Wednesday, January 10, 2001 12:47:17 AM -0500 Alexander Viro
<viro@math.psu.edu> wrote:

> However, actual code really looks like the end of filldir(). If that's the
> case we are deep in it - argument of filldir() gets screwed. buf, that is.
> Since it happens after we've already done dereferencing of buf in
> filldir() and we don't trigger them... Fsck knows. copy_to_user() and
> put_user() should not be able to screw the kernel stack.
>
In filldir, I don't like the line where we ((char *)dirent += reclen ; If
reclen is much larger than the buffer sent from userspace, I don't see how
we stay in bounds.

-chris