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
next 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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