Re: Git and SHA-1 security (again)

From: Johannes Schindelin <johannes.schindelin@gmx.de>
Date: Jul 19, 2016, 07:31 UTC
Message-ID: <alpine.DEB.2.20.1607190926420.3472@virtualbox>
In-Reply-To: <CACsJy8AH9Q6rOgvcWGsLGPaP96koGA=k0PYgXP6F3RZ=XAwaSw@mail.gmail.com>

Hi Duy,

On Mon, 18 Jul 2016, Duy Nguyen wrote:

Show 11 quoted lines

> On Sun, Jul 17, 2016 at 4:21 PM, brian m. carlson
> <sandals@crustytoothpaste.net> wrote:
> > I'm going to end up having to do something similar because of the issue
> > of submodules.  Submodules may still be SHA-1, while the main repo may
> > be a newer hash.
> 
> Or even the other way around, main repo is one with sha1 while
> submodule is on sha256. I wonder if we should address this separately
> (and even in parallel with sha256 support), making submodules work
> with an any external VCS system (that supports some basic operations
> we define).

It is safe to assume that any project using a submodule with a more secure hash would require Git tooling capable of said hash. It would hence make no sense to use SHA-1 for the super project.

So I do not believe that we have to support the use case of a SHA-1-based project using SHA-256-based submodules.

Ciao, Dscho