linux-kernel - Re: [PATCH] fs/proc/kcore.c: Omit kernel text area for hardened usercopy feature

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Message-ID: <CA+55aFzx1Z6aN9XN4SnFJtMjXvfk5ex9L7QWR=k39G0k9r0Jwg@mail.gmail.com>
Date:   Tue, 6 Sep 2016 11:34:28 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, Andi Kleen <andi@...stfloor.org>,
        Jiri Olsa <jolsa@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH] fs/proc/kcore.c: Omit kernel text area for hardened
 usercopy feature

On Tue, Sep 6, 2016 at 10:56 AM, Kees Cook <keescook@...omium.org> wrote:
>
> In the meantime, how about continuing to use a bounce buffer like
> already done in the vmalloc_or_module_addr() case immediately above?

Yes please. Let's not make up even more of the user access functions
with magical properties, for some special-case code in /proc/kcore.

             Linus