From: Taylor Blau <me@ttaylorr.com>
To: Emily Shaffer <emilyshaffer@google.com>
Cc: "Taylor Blau" <me@ttaylorr.com>,
"Glen Choo" <chooglen@google.com>,
"Git List" <git@vger.kernel.org>,
justin@justinsteven.com,
"Johannes Schindelin" <Johannes.Schindelin@gmx.de>,
"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>,
"Derrick Stolee" <derrickstolee@github.com>,
"Junio C Hamano" <gitster@pobox.com>,
"brian m. carlson" <sandals@crustytoothpaste.net>,
"Randall S. Becker" <rsbecker@nexbridge.com>,
"Martin von Zweigbergk" <martinvonz@google.com>
Subject: Re: Bare repositories in the working tree are a security risk
Date: Thu, 21 Apr 2022 17:22:04 -0400 [thread overview]
Message-ID: <YmHK/GJ3qa7QuVUD@nand.local> (raw)
In-Reply-To: <CAJoAoZnd=BKycr0c71-BQJyO3zoymC7p++Zke+OSkV4neweAOQ@mail.gmail.com>
On Thu, Apr 21, 2022 at 02:01:44PM -0700, Emily Shaffer wrote:
> I don't think there is much reason to continue searching above the
> first found '.git' because we disallow '.git' from being committed or
> checked out, right? So this extra filesystem hunting and ceiling math
> seems unnecessary to me. I know I am slightly allergic to searching
> the filesystem for a parent repo to begin with, so I'm sure I've got
> some bias here ;)
Right; once we find a non-bare embedding repository we should absolutely
stop our search. I was suggesting we could stop our search earlier for
environments that use non-embedded bare repositories with a fairly deep
directory structure.
E.g., if you store lots of bare repositories in /data/repositories and
you know that none of them are embedded, we could quickly determine
whether or not the cwd is a descendent of /data/repositories and avoid
the search entirely if so.
> > We'd probably want to allow saying "all embedded bare repositories are
> > safe to read config/hooks from", too. I hadn't considered this approach
> > as a way to read some embedded repos and not others; I suspect the
> > overwhelmingly common use-case would be: `git config --local
> > safe.embeddedRepo '*'`.
>
> Ah, I dislike this option for the exact reason I mentioned - avoiding
> a malicious repo being snuck in next to legitimate repos. I'd prefer
> to rely on exact matching only - but as the config needs to be set by
> every contributor every time the set of bare repos changes, that
> sounds impossible to manage for a project which may be constantly
> adding and removing these repos.
I share your distaste for this sort of thing, but I think we have to
recognize that there are likely to be many repos that embed dozens or
more bare repos inside of them, and asking them to opt-in each one
individually seems like a fairly large request for Git to make of them.
> That said.... I'm biased again, but if you want to be certain of the
> state of another repository in order to run tests in it... why not use
> a submodule for that repository? Not a helpful comment for those
> already using embedded bare repos, though ;)
Exactly, re: your last sentence.
> Thanks for the food for thought.
Ditto!
Thanks,
Taylor
next prev parent reply other threads:[~2022-04-21 21:22 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-06 22:43 Bare repositories in the working tree are a security risk Glen Choo
2022-04-06 23:22 ` [PATCH] fsck: detect bare repos in trees and warn Glen Choo
2022-04-07 12:42 ` Johannes Schindelin
2022-04-07 13:21 ` Derrick Stolee
2022-04-07 14:14 ` Ævar Arnfjörð Bjarmason
2022-04-14 20:02 ` Glen Choo
2022-04-15 12:46 ` Ævar Arnfjörð Bjarmason
2022-04-07 15:11 ` Junio C Hamano
2022-04-13 22:24 ` Glen Choo
2022-04-07 13:12 ` Ævar Arnfjörð Bjarmason
2022-04-07 15:20 ` Junio C Hamano
2022-04-07 18:38 ` Bare repositories in the working tree are a security risk John Cai
2022-04-07 21:24 ` brian m. carlson
2022-04-07 21:53 ` Justin Steven
2022-04-07 22:10 ` brian m. carlson
2022-04-07 22:40 ` rsbecker
2022-04-08 5:54 ` Junio C Hamano
2022-04-14 0:03 ` Junio C Hamano
2022-04-14 0:04 ` Glen Choo
2022-04-13 23:44 ` Glen Choo
2022-04-13 20:37 ` Glen Choo
2022-04-13 23:36 ` Junio C Hamano
2022-04-14 16:41 ` Glen Choo
2022-04-14 17:35 ` Junio C Hamano
2022-04-14 18:19 ` Junio C Hamano
2022-04-15 21:33 ` Glen Choo
2022-04-15 22:17 ` Junio C Hamano
2022-04-16 0:52 ` Taylor Blau
2022-04-15 22:43 ` Glen Choo
2022-04-15 20:13 ` Junio C Hamano
2022-04-15 23:45 ` Glen Choo
2022-04-15 23:59 ` Glen Choo
2022-04-16 1:00 ` Taylor Blau
2022-04-16 1:18 ` Junio C Hamano
2022-04-16 1:30 ` Taylor Blau
2022-04-16 0:34 ` Glen Choo
2022-04-16 0:41 ` Glen Choo
2022-04-16 1:28 ` Taylor Blau
2022-04-21 18:25 ` Emily Shaffer
2022-04-21 18:29 ` Emily Shaffer
2022-04-21 18:47 ` Junio C Hamano
2022-04-21 18:54 ` Taylor Blau
2022-04-21 19:09 ` Taylor Blau
2022-04-21 21:01 ` Emily Shaffer
2022-04-21 21:22 ` Taylor Blau [this message]
2022-04-29 23:57 ` Glen Choo
2022-04-30 1:14 ` Taylor Blau
2022-05-02 19:39 ` Glen Choo
2022-05-02 14:05 ` Philip Oakley
2022-05-02 18:50 ` Junio C Hamano
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