From: "René Scharfe" <l.s.r@web.de>
To: Jonathan Nieder <jrnieder@gmail.com>,
David Turner <dturner@twosigma.com>
Cc: git@vger.kernel.org
Subject: Re: [PATCH v3 1/2] use HOST_NAME_MAX to size buffers for gethostname(2)
Date: Wed, 19 Apr 2017 16:03:19 +0200 [thread overview]
Message-ID: <269cbe1c-d10a-7022-1977-2128d59aebb3@web.de> (raw)
In-Reply-To: <20170419012824.GA28740@aiede.svl.corp.google.com>
Am 19.04.2017 um 03:28 schrieb Jonathan Nieder:
>> From: René Scharfe <l.s.r@web.de>
>>
>> POSIX limits the length of host names to HOST_NAME_MAX. Export the
>> fallback definition from daemon.c and use this constant to make all
>> buffers used with gethostname(2) big enough for any possible result
>> and a terminating NUL.
>
> Since some platforms do not define HOST_NAME_MAX and we provide a
> fallback, this is not actually big enough for any possible result.
> For example, the Hurd allows arbitrarily long hostnames.
Interesting. No limits, eh? They suggest to allocate memory
dynamically [1]. Perhaps we should import their xgethostname() (which
grows a buffer as needed), or implement a strbuf_add_hostname()?
René
https://www.gnu.org/software/hurd/hurd/porting/guidelines.html#MAXHOSTNAMELEN_tt_
next prev parent reply other threads:[~2017-04-19 14:03 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-18 21:57 [PATCH v3 0/2] gethostbyname fixes David Turner
2017-04-18 21:57 ` [PATCH v3 1/2] use HOST_NAME_MAX to size buffers for gethostname(2) David Turner
2017-04-19 1:28 ` Jonathan Nieder
2017-04-19 2:57 ` Junio C Hamano
2017-04-19 14:03 ` René Scharfe [this message]
2017-04-19 17:28 ` René Scharfe
2017-04-19 19:08 ` David Turner
2017-04-19 19:09 ` Torsten Bögershausen
2017-04-19 20:02 ` René Scharfe
2017-04-20 18:37 ` Torsten Bögershausen
2017-04-20 19:28 ` René Scharfe
2017-04-21 4:18 ` Torsten Bögershausen
2017-04-18 21:57 ` [PATCH v3 2/2] xgethostname: handle long hostnames David Turner
2017-04-19 1:35 ` Jonathan Nieder
2017-04-19 2:51 ` Junio C Hamano
2017-04-19 15:50 ` David Turner
2017-04-19 16:43 ` René Scharfe
2017-04-19 2:48 ` Junio C Hamano
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