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From: Jeff King <peff@peff.net>
To: git@vger.kernel.org
Subject: [PATCH 0/6] better handling of gigantic config files
Date: Fri, 10 Apr 2020 15:42:11 -0400	[thread overview]
Message-ID: <20200410194211.GA1363484@coredump.intra.peff.net> (raw)

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

             reply	other threads:[~2020-04-10 19:42 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-10 19:42 Jeff King [this message]
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 ` [PATCH 0/6] better handling of gigantic config files Taylor Blau
2020-04-13 17:20   ` Jeff King
2020-04-13 17:23     ` Taylor Blau

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