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SubjectRe: mount --bind accounting

On Sun, 3 Jun 2001 wrote:

> Something entirely different.
> Last year I added the comment
> /* No capabilities? What if users do thousands of these? */
> in super.c for "mount --bind".
> Now that I do some polishing there I noticed the comment again.
> Each bind does an alloc_vfsmnt() and hence takes some kernel memory.
> Any user can therefore take all kernel memory, until
> kmalloc(sizeof(struct vfsmount), GFP_KERNEL)
> fails. Bad security.
> I suppose something needs to be done about that.

Like looking at mount_is_safe(), maybe?

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