git@vger.kernel.org list mirror (unofficial, one of many)
 help / color / mirror / code / Atom feed
From: Taylor Blau <me@ttaylorr.com>
To: Jeff King <peff@peff.net>
Cc: git@vger.kernel.org
Subject: Re: [PATCH 0/6] better handling of gigantic config files
Date: Sun, 12 Apr 2020 18:49:27 -0600	[thread overview]
Message-ID: <20200413004927.GC55122@syl.local> (raw)
In-Reply-To: <20200410194211.GA1363484@coredump.intra.peff.net>

Hi Peff,

On Fri, Apr 10, 2020 at 03:42:11PM -0400, Jeff King wrote:
> The fact that parse_config_key() requires its callers to use an "int"
> for a string length has bugged me for a while, and it re-bugged me when
> looking at it today. So I finally decided to do something about it,
> which led to an odyssey of other small fixes and cleanups.
>
> In particular, I was curious what kinds of bad behavior you could
> provoke by having a key name larger than 2GB (especially because we use
> the same parser for .gitmodules files, which might not be trusted). It
> turns out: basically none, because the config parser chokes immediately
> dues to its own int/size_t confusion.
>
> After patch 5, the config system _can_ actually handle stupidly-sized
> config keys, but in the end I decided to explicitly disallow them.
> There's downstream code that would be impossible to fix, and nobody
> actually cares about this case working anyway. See patch 6 for more
> discussion. I do still think the other patches are worth having as a
> cleanup; the more code that is safe from unexpected integer truncation
> the better.
>
>   [1/6]: remote: drop auto-strlen behavior of make_branch() and make_rewrite()
>   [2/6]: parse_config_key(): return subsection len as size_t
>   [3/6]: config: drop useless length variable in write_pair()
>   [4/6]: git_config_parse_key(): return baselen as size_t
>   [5/6]: config: use size_t to store parsed variable baselen
>   [6/6]: config: reject parsing of files over INT_MAX
>
>  archive-tar.c      |  4 ++--
>  builtin/help.c     |  2 +-
>  builtin/reflog.c   |  2 +-
>  config.c           | 42 +++++++++++++++++++++++++++++-------------
>  config.h           |  4 ++--
>  convert.c          |  2 +-
>  fsck.c             |  2 +-
>  ll-merge.c         |  2 +-
>  promisor-remote.c  |  2 +-
>  remote.c           | 37 +++++++++++++------------------------
>  submodule-config.c |  3 ++-
>  userdiff.c         |  4 ++--
>  12 files changed, 56 insertions(+), 50 deletions(-)
>
> -Peff

Thanks for doing this. I knew that it rang a bell for some reason, but
it was because of the upload-pack changes to limit the set of allowed
object filter choices that I'd sent as an RFC somewhere.

I was using 'parse_config_key()', and I think that you noted somewhere
that it was odd that it filled an int and not a size_t. So, thanks very
much for fixing that case.

This series looks very good and straightforward to me. So,

  Reviewed-by: Taylor Blau <me@ttaylorr.com>

Thanks,
Taylor

  parent reply	other threads:[~2020-04-13  0:49 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-10 19:42 Jeff King
2020-04-10 19:43 ` [PATCH 1/6] remote: drop auto-strlen behavior of make_branch() and make_rewrite() Jeff King
2020-04-10 21:44   ` Junio C Hamano
2020-04-10 19:44 ` [PATCH 2/6] parse_config_key(): return subsection len as size_t Jeff King
2020-04-10 19:44 ` [PATCH 3/6] config: drop useless length variable in write_pair() Jeff King
2020-04-10 21:51   ` Junio C Hamano
2020-04-10 19:46 ` [PATCH 4/6] git_config_parse_key(): return baselen as size_t Jeff King
2020-04-10 19:47 ` [PATCH 5/6] config: use size_t to store parsed variable baselen Jeff King
2020-04-10 19:50 ` [PATCH 6/6] config: reject parsing of files over INT_MAX Jeff King
2020-04-10 22:04   ` Junio C Hamano
2020-04-10 22:15     ` Jeff King
2020-04-13  0:47       ` Taylor Blau
2020-04-13 22:14         ` Junio C Hamano
2020-04-13  0:49 ` Taylor Blau [this message]
2020-04-13 17:20   ` [PATCH 0/6] better handling of gigantic config files Jeff King
2020-04-13 17:23     ` Taylor Blau

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

  List information: http://vger.kernel.org/majordomo-info.html

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200413004927.GC55122@syl.local \
    --to=me@ttaylorr.com \
    --cc=git@vger.kernel.org \
    --cc=peff@peff.net \
    --subject='Re: [PATCH 0/6] better handling of gigantic config files' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Code repositories for project(s) associated with this inbox:

	https://80x24.org/mirrors/git.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).