Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Thu, 5 Mar 2020 13:49:08 -0700
From:   Tycho Andersen <tycho@tycho.ws>
To:     Arvind Sankar <nivedita@alum.mit.edu>
Cc:     Kees Cook <keescook@chromium.org>,
        "Tobin C . Harding" <me@tobin.cc>,
        kernel-hardening@lists.openwall.com,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Andy Lutomirski <luto@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>, x86@kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3] x86/mm/init_32: Stop printing the virtual memory
 layout
Message-ID: <20200305204908.GA6506@cisco>
References: <202003021039.257258E1B@keescook>
 <20200305150152.831697-1-nivedita@alum.mit.edu>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20200305150152.831697-1-nivedita@alum.mit.edu>
User-Agent: Mutt/1.10.1 (2018-07-13)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Thu, Mar 05, 2020 at 10:01:52AM -0500, Arvind Sankar wrote:
> For security, don't display the kernel's virtual memory layout.
> 
> Kees Cook points out:
> "These have been entirely removed on other architectures, so let's
> just do the same for ia32 and remove it unconditionally."
> 
> 071929dbdd86 ("arm64: Stop printing the virtual memory layout")
> 1c31d4e96b8c ("ARM: 8820/1: mm: Stop printing the virtual memory layout")
> 31833332f798 ("m68k/mm: Stop printing the virtual memory layout")
> fd8d0ca25631 ("parisc: Hide virtual kernel memory layout")
> adb1fe9ae2ee ("mm/page_alloc: Remove kernel address exposure in free_reserved_area()")
> 
> Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>

Acked-by: Tycho Andersen <tycho@tycho.ws>