linux-kernel - Re: [PATCH v2] vmap(): don't allow invalid pages

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Message-ID: <CAAH8bW9s9ENa7QOExV3rOqn-LAEu1RrQd+ijor9o=jhGxm=6ew@mail.gmail.com>
Date:   Tue, 25 Jan 2022 18:29:04 -0800
From:   Yury Norov <yury.norov@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Ding Tianhong <dingtianhong@...wei.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Matthew Wilcox <willy@...radead.org>,
        Alexey Klimov <aklimov@...hat.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH v2] vmap(): don't allow invalid pages

On Tue, Jan 25, 2022 at 6:25 PM Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> On Tue, 18 Jan 2022 17:21:09 -0800 Yury Norov <yury.norov@...il.com> wrote:
>
> > vmap() takes struct page *pages as one of arguments, and user may provide
> > an invalid pointer which would lead to data abort at address translation
> > later.
>
> Does "user" mean userspace code?
>
> If so, please tell us much more about the means by which userspace can
> trigger this problem.

User means user of vmap() API. The discussion is here:

https://lore.kernel.org/linux-mm/20220118235244.540103-1-yury.norov@gmail.com/

I'll send v3 soon with more details in the patch description.