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Message-ID: <20151109210700.GE20491@io.lakedaemon.net>
Date: Mon, 9 Nov 2015 21:07:00 +0000
From: Jason Cooper <kernel-hardening@...edaemon.net>
To: Josh Triplett <josh@...htriplett.org>
Cc: Theodore Tso <tytso@...gle.com>, kernel-hardening@...ts.openwall.com,
Emese Revfy <re.emese@...il.com>, Kees Cook <keescook@...omium.org>,
PaX Team <pageexec@...email.hu>,
Brad Spengler <spender@...ecurity.net>,
Greg KH <gregkh@...uxfoundation.org>
Subject: Re: Re: Proposal for kernel self protection
features
On Mon, Nov 09, 2015 at 12:06:23PM -0800, Josh Triplett wrote:
> On Mon, Nov 09, 2015 at 02:11:35PM -0500, Theodore Tso wrote:
> > On Mon, Nov 9, 2015 at 2:02 PM, Jason Cooper <
> > kernel-hardening@...edaemon.net> wrote:
> >
> > > /var/lib/misc/random-seed has served that role for years, I'm only
> > > advocating loading it earlier in the boot process. It's *much* harder
> > > to guess the state of random-seed than the dtb or mac address(es)...
> > >
> >
> > If the bootloader is willing to reach into the file system, which means (a)
> > having a minimal file system layer, like Grub does, and (b) can find the
> > block device where the file is found, that's a perfectly *fine*
> > implementation. I'm not sure mobile handset vendors will be all that
> > psyched into either using or replicating all of Grub's functionality so it
> > could do that, though....
>
> How crazy would it be to append it to the end of the initramfs, as we've
> started making possible for critical firmware/microcode/tables?
Well, my main goal was to strengthen KASLR on ARM. Which means the code
needs to reside in the decompressor...
thx,
Jason.
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