linux-kernel - Re: [PATCH] fork, vmalloc: KASAN-poison backing pages of vmapped stacks

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Message-ID: <CAG48ez246oQD-rdnemBokm+345Uo+OejvVQk1mR4=9fXzbX0gQ@mail.gmail.com>
Date:   Wed, 25 Jan 2023 10:49:48 +0100
From:   Jann Horn <jannh@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org
Cc:     Uladzislau Rezki <urezki@...il.com>,
        Christoph Hellwig <hch@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        linux-kernel@...r.kernel.org,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        kasan-dev@...glegroups.com
Subject: Re: [PATCH] fork, vmalloc: KASAN-poison backing pages of vmapped stacks

On Tue, Jan 17, 2023 at 5:35 PM Jann Horn <jannh@...gle.com> wrote:
> KASAN (except in HW_TAGS mode) tracks memory state based on virtual
> addresses. The mappings of kernel stack pages in the linear mapping are
> currently marked as fully accessible.
> Since stack corruption issues can cause some very gnarly errors, let's be
> extra careful and tell KASAN to forbid accesses to stack memory through the
> linear mapping.
>
> Signed-off-by: Jann Horn <jannh@...gle.com>

@akpm please remove this one from your tree for now, it's unlikely to
work at least for now because there's code like cifs_sg_set_buf()