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From: Jonathan Nieder <jrnieder@gmail.com>
To: Jeff King <peff@peff.net>
Cc: git@vger.kernel.org, Brandon Williams <bwilliams.eng@gmail.com>,
	Stefan Beller <sbeller@google.com>,
	Aaron Schrab <aaron@schrab.com>
Subject: Re: [RFC] submodule: munge paths to submodule git directories
Date: Mon, 14 Jan 2019 17:25:07 -0800
Message-ID: <20190115012507.GK162110@google.com> (raw)
In-Reply-To: <20180807230637.247200-1-bmwill@google.com>

Hi,

In August, 2018, Brandon Williams wrote:

> Commit 0383bbb901 (submodule-config: verify submodule names as paths,
> 2018-04-30) introduced some checks to ensure that submodule names don't
> include directory traversal components (e.g. "../").
>
> This addresses the vulnerability identified in 0383bbb901 but the root
> cause is that we use submodule names to construct paths to the
> submodule's git directory.  What we really should do is munge the
> submodule name before using it to construct a path.

Thanks again for this.  I liked the proposal enough to run Git with
patches implementing it for a while.  That said, there were some
unaddressed comments in the review.

I've put a summary in https://crbug.com/git/28 to make this easier to
pick up where we left off.  Summary from there of the upstream review:

1. Using urlencoding to escape the slashes is fine, but what if we
   want to escape some other character (for example to handle
   case-insensitive filesystems)?

   Proposal: Store the escaping mapping in config[1] so it can be
   modified it in the future:

	[submodule "plugin/hooks"]
		gitdirname = plugins%2fhooks

2. The urlencoded name could conflict with a submodule that has % in
   its name in an existing clone created by an older version of Git.

   Proposal: Put submodules in a new .git/submodules/ directory
   instead of .git/modules/.

3. These gitdirname settings can clutter up .git/config.

   Proposal: For the "easy" cases (e.g. submodule name consisting of
   [a-z]*), allow omitting the gitdirname setting.

Is that a fair summary?  Are there concerns from the review that I
forgot, or would a new version of the series that addresses those
three problems put us in good shape?

Thanks,
Jonathan

[1] https://public-inbox.org/git/20180816181940.46114-1-bmwill@google.com/

  parent reply index

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-07 23:06 Brandon Williams
2018-08-07 23:25 ` Jonathan Nieder
2018-08-08  0:14 ` Junio C Hamano
2018-08-08 22:33 ` [PATCH 0/2] munge submodule names Brandon Williams
2018-08-08 22:33   ` [PATCH 1/2] submodule: create helper to build paths to submodule gitdirs Brandon Williams
2018-08-08 23:21     ` Stefan Beller
2018-08-09  0:45       ` Brandon Williams
2018-08-10 21:27     ` Junio C Hamano
2018-08-10 21:45       ` Brandon Williams
2018-08-08 22:33   ` [PATCH 2/2] submodule: munge paths to submodule git directories Brandon Williams
2018-08-09 21:26     ` Jeff King
2018-08-14 18:04       ` Brandon Williams
2018-08-14 18:57         ` Jonathan Nieder
2018-08-14 21:08           ` Stefan Beller
2018-08-14 21:12             ` Jonathan Nieder
2018-08-14 22:34               ` Stefan Beller
2018-08-16  2:34                 ` Jonathan Nieder
2018-08-16  2:39                   ` Stefan Beller
2018-08-16  2:47                     ` Jonathan Nieder
2018-08-16 17:34                       ` Brandon Williams
2018-08-16 18:19                       ` [PATCH] submodule: add config for where gitdirs are located Brandon Williams
2018-08-20 22:03                         ` Junio C Hamano
2018-08-16 15:07                   ` [PATCH 2/2] submodule: munge paths to submodule git directories Junio C Hamano
2018-08-14 18:58         ` Jeff King
2018-08-28 21:35         ` Stefan Beller
2018-08-29  5:25           ` Jeff King
2018-08-29 18:10             ` Stefan Beller
2018-08-29 21:03               ` Jeff King
2018-08-29 21:10                 ` Stefan Beller
2018-08-29 21:18                   ` Jonathan Nieder
2018-08-29 21:27                     ` Stefan Beller
2018-08-29 21:30                   ` Jeff King
2018-08-29 21:09             ` Jonathan Nieder
2018-08-29 21:14               ` Stefan Beller
2018-08-29 21:25                 ` Brandon Williams
2018-08-29 21:32               ` Jeff King
2018-08-16  0:19     ` Aaron Schrab
2019-01-15  1:25 ` Jonathan Nieder [this message]
2019-01-17 17:32   ` [RFC] " Jeff King
2019-01-17 17:57     ` Stefan Beller

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