linux-kernel - Re: [PATCH 1/3] mm/vmalloc: fix size check for remap_vmalloc_range

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Message-ID: <873d9ee8-9cee-b6f1-ca2c-f4da2d2ddfc0@virtuozzo.com>
Date:   Fri, 11 Jan 2019 22:19:12 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     Roman Penyaev <rpenyaev@...e.de>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>, Joe Perches <joe@...ches.com>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 1/3] mm/vmalloc: fix size check for
 remap_vmalloc_range_partial()



On 1/3/19 5:59 PM, Roman Penyaev wrote:
> area->size can include adjacent guard page but get_vm_area_size()
> returns actual size of the area.
> 
> This fixes possible kernel crash when userspace tries to map area
> on 1 page bigger: size check passes but the following vmalloc_to_page()
> returns NULL on last guard (non-existing) page.
> 
> Signed-off-by: Roman Penyaev <rpenyaev@...e.de>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
> Cc: Joe Perches <joe@...ches.com>
> Cc: "Luis R. Rodriguez" <mcgrof@...nel.org>
> Cc: linux-mm@...ck.org
> Cc: linux-kernel@...r.kernel.org
> Cc: stable@...r.kernel.org
> ---

Fixes: e69e9d4aee71 ("vmalloc: introduce remap_vmalloc_range_partial")
Acked-by: Andrey Ryabinin <aryabinin@...tuozzo.com>