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Date:   Mon, 13 Jun 2022 09:23:15 -0700
From:   Kees Cook <>
To:     "Matthew Wilcox (Oracle)" <>
Cc:, Uladzislau Rezki <>,
        Zorro Lang <>,,
Subject: Re: [PATCH 1/3] usercopy: Handle vm_map_ram() areas

On Sun, Jun 12, 2022 at 10:32:25PM +0100, Matthew Wilcox (Oracle) wrote:
> vmalloc does not allocate a vm_struct for vm_map_ram() areas.  That causes
> us to deny usercopies from those areas.  This affects XFS which uses
> vm_map_ram() for its directories.
> Fix this by calling find_vmap_area() instead of find_vm_area().

Thanks for the fixes!

> [...]
> +		/* XXX: We should also abort for free vmap_areas */

What's needed to detect this?

Kees Cook

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