linux-kernel - Re: fix filler_t callback type mismatches

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Message-ID: <CAGXu5jKMswkBy-kEk7mb01v3oJADvGyhRf6JMh7BsjUKsme9QA@mail.gmail.com>
Date:   Wed, 1 May 2019 11:25:23 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Linux mtd <linux-mtd@...ts.infradead.org>,
        "open list:NFS, SUNRPC, AND..." <linux-nfs@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: fix filler_t callback type mismatches

On Wed, May 1, 2019 at 9:07 AM Christoph Hellwig <hch@....de> wrote:
>
> Casting mapping->a_ops->readpage to filler_t causes an indirect call
> type mismatch with Control-Flow Integrity checking. This change fixes
> the mismatch in read_cache_page_gfp and read_mapping_page by adding
> using a NULL filler argument as an indication to call ->readpage
> directly, and by passing the right parameter callbacks in nfs and jffs2.

Nice. This looks great; thanks for looking at this. For the series
(including patch 5):

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook