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| From | Nobody <nobody@nowhere.com> |
|---|---|
| Subject | Re: hexump.c |
| Date | 2011-09-14 13:50 +0100 |
| Message-Id | <pan.2011.09.14.12.50.00.183000@nowhere.com> |
| Newsgroups | comp.lang.c |
| References | (4 earlier) <slrnj6tqu4.2bf0.usenet-nospam@guild.seebs.net> <j4n4gb$o81$1@speranza.aioe.org> <ln39fzby0w.fsf@nuthaus.mib.org> <j4q0e1$9q3$1@dont-email.me> <j4q4kt$lgr$1@speranza.aioe.org> |
| Organization | Zen Internet |
On Wed, 14 Sep 2011 13:54:06 +0200, jacob navia wrote: > This obsession with portability reaches here new heights... > > Programs must be written (by beginners) such that they run still > unmodified in 20 years, so the children of the students can peek into > their father's homework and copy it unmodified. It isn't always necessary to write portable code. However, whether your code is portable or not should be a deliberate choice, not an accidental consequence of not knowing what is or isn't portable. Anyone with a brain can discover typical behaviour through trial and error, but that won't tell you whether such behaviour is actually guaranteed. People will only learn that information if they specifically go looking for it (which won't happen if they /think/ they already know), or if someone actually tells them. Why does it matter if code "only" works 99.999% of the time? Because if security is an issue, it's often quite straightforward for someone to force the "0.001%" case to happen. If you ever need to write a program which has security implications, it's not enough to know what should happen or what will probably happen. You have to know what /could/ happen; all of it: every, single possibility. Admittedly, argv[0]==NULL doesn't have much scope for exploitation, although it has some; e.g. a potential DoS if you can force a program to segfault while reporting an error which should otherwise be recoverable (or if the program should at least be able to "clean up" before terminating).
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hexump.c jacob navia <jacob@spamsink.net> - 2011-09-09 22:53 +0200
Re: hexump.c tea strainer <nospam@nospam.com> - 2011-09-09 21:06 +0000
Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-09 23:57 +0200
Re: hexump.c NicStevens <nic.stevens@gmail.com> - 2011-09-12 13:22 -0700
Re: hexump.c Ian Collins <ian-news@hotmail.com> - 2011-09-10 09:18 +1200
Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-09 23:59 +0200
Re: hexump.c Ike Naar <ike@iceland.freeshell.org> - 2011-09-09 22:29 +0000
Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-10 00:39 +0200
Re: hexump.c Ike Naar <ike@iceland.freeshell.org> - 2011-09-09 22:53 +0000
Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-10 00:58 +0200
Re: hexump.c Seebs <usenet-nospam@seebs.net> - 2011-09-13 06:44 +0000
Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-13 10:33 +0200
Re: hexump.c Fritz Wuehler <fritz@spamexpire-201109.rodent.frell.theremailer.net> - 2011-09-13 18:02 +0200
Teaching C (was Re: hexump.c) Kenneth Brody <kenbrody@spamcop.net> - 2011-09-13 16:36 -0400
Re: Teaching C (was Re: hexump.c) jacob navia <jacob@spamsink.net> - 2011-09-13 22:44 +0200
Re: Teaching C (was Re: hexump.c) Nobody <nobody@nowhere.com> - 2011-09-14 13:31 +0100
Re: Teaching C (was Re: hexump.c) jacob navia <jacob@spamsink.net> - 2011-09-14 15:27 +0200
Re: Teaching C (was Re: hexump.c) Richard Damon <news.x.richarddamon@xoxy.net> - 2011-09-14 11:49 -0400
Re: Teaching C (was Re: hexump.c) Keith Thompson <kst-u@mib.org> - 2011-09-14 13:27 -0700
Re: Teaching C (was Re: hexump.c) pacman@kosh.dhis.org (Alan Curry) - 2011-09-14 20:59 +0000
Re: Teaching C (was Re: hexump.c) Nobody <nobody@nowhere.com> - 2011-09-14 22:20 +0100
Re: Teaching C (was Re: hexump.c) James Kuyper <jameskuyper@verizon.net> - 2011-09-14 17:20 -0400
Re: Teaching C (was Re: hexump.c) pacman@kosh.dhis.org (Alan Curry) - 2011-09-15 01:51 +0000
Re: Teaching C (was Re: hexump.c) Keith Thompson <kst-u@mib.org> - 2011-09-14 19:29 -0700
Re: Teaching C (was Re: hexump.c) Keith Thompson <kst-u@mib.org> - 2011-09-14 19:21 -0700
Re: Teaching C Ben Pfaff <blp@cs.stanford.edu> - 2011-09-14 19:58 -0700
Re: Teaching C Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2011-09-14 21:55 -0600
Re: Teaching C James Kuyper <jameskuyper@verizon.net> - 2011-09-15 06:54 -0400
Re: Teaching C Keith Thompson <kst-u@mib.org> - 2011-09-15 11:58 -0700
Re: Teaching C Tim Rentsch <txr@alumni.caltech.edu> - 2012-01-24 12:57 -0800
Re: Teaching C Nobody <nobody@nowhere.com> - 2011-09-15 14:25 +0100
Re: Teaching C Seebs <usenet-nospam@seebs.net> - 2011-09-16 22:00 +0000
Re: Teaching C (was Re: hexump.c) Kenneth Brody <kenbrody@spamcop.net> - 2011-09-14 12:54 -0400
Re: Teaching C (was Re: hexump.c) James Kuyper <jameskuyper@verizon.net> - 2011-09-14 13:26 -0400
Re: Teaching C (was Re: hexump.c) jacob navia <jacob@spamsink.net> - 2011-09-14 19:33 +0200
Re: Teaching C (was Re: hexump.c) jameskuyper <jameskuyper@verizon.net> - 2011-09-14 11:33 -0700
Re: Teaching C (was Re: hexump.c) jacob navia <jacob@spamsink.net> - 2011-09-14 21:17 +0200
Re: Teaching C (was Re: hexump.c) Kenneth Brody <kenbrody@spamcop.net> - 2011-09-16 11:47 -0400
Re: Teaching C (was Re: hexump.c) Seebs <usenet-nospam@seebs.net> - 2011-09-14 20:43 +0000
Re: Teaching C (was Re: hexump.c) Nobody <nobody@nowhere.com> - 2011-09-14 22:35 +0100
Re: Teaching C (was Re: hexump.c) gordonb.8a7i1@burditt.org (Gordon Burditt) - 2011-09-14 17:31 -0500
Re: Teaching C (was Re: hexump.c) jacob navia <jacob@spamsink.net> - 2011-09-14 19:32 +0200
Re: Teaching C (was Re: hexump.c) Kenneth Brody <kenbrody@spamcop.net> - 2011-09-16 11:27 -0400
Re: Teaching C (was Re: hexump.c) Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-09-16 08:49 -0700
Re: Teaching C (was Re: hexump.c) James Kuyper <jameskuyper@verizon.net> - 2011-09-17 15:04 -0400
Re: hexump.c Keith Thompson <kst-u@mib.org> - 2011-09-13 20:31 -0700
Re: hexump.c Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-09-14 03:22 -0700
Re: hexump.c "BartC" <bc@freeuk.com> - 2011-09-14 11:40 +0100
Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-14 13:54 +0200
Re: hexump.c Nobody <nobody@nowhere.com> - 2011-09-14 13:50 +0100
Re: hexump.c Keith Thompson <kst-u@mib.org> - 2011-09-14 11:35 -0700
Re: hexump.c Seebs <usenet-nospam@seebs.net> - 2011-09-14 19:12 +0000
Re: hexump.c John Bode <jfbode1029@gmail.com> - 2011-09-14 15:31 -0700
Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-15 00:59 +0200
Re: hexump.c Kleuskes & Moos <kleuske@somewhere.else.net> - 2011-09-14 23:14 +0000
Re: hexump.c John Bode <jfbode1029@gmail.com> - 2011-09-15 08:52 -0700
Re: hexump.c Jens Gustedt <jens.gustedt@loria.fr> - 2011-09-14 21:22 +0200
Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-14 21:26 +0200
Re: hexump.c Ian Collins <ian-news@hotmail.com> - 2011-09-15 07:32 +1200
Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-14 21:44 +0200
Re: hexump.c Keith Thompson <kst-u@mib.org> - 2011-09-14 13:49 -0700
Re: hexump.c Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-09-16 00:50 +0300
Re: hexump.c Keith Thompson <kst-u@mib.org> - 2011-09-15 18:34 -0700
Re: hexump.c Keith Thompson <kst-u@mib.org> - 2011-09-14 12:16 -0700
Hypocrites jacob navia <jacob@spamsink.net> - 2011-09-14 21:40 +0200
Re: Hypocrites Keith Thompson <kst-u@mib.org> - 2011-09-14 19:11 -0700
Re: hexump.c Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-09-14 15:05 +0100
Re: hexump.c Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-09-14 07:56 -0700
Re: hexump.c "BartC" <bc@freeuk.com> - 2011-09-14 17:23 +0100
Re: hexump.c Seebs <usenet-nospam@seebs.net> - 2011-09-14 19:12 +0000
Re: hexump.c John Bode <jfbode1029@gmail.com> - 2011-09-14 15:24 -0700
Re: hexump.c gordonb.ik17p@burditt.org (Gordon Burditt) - 2011-09-09 18:16 -0500
Re: hexump.c Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-09-12 22:24 +0000
Re: hexump.c "Morris Keesan" <mkeesan@post.harvard.edu> - 2011-09-09 20:33 -0400
Re: hexump.c Ian Collins <ian-news@hotmail.com> - 2011-09-10 12:42 +1200
Re: hexump.c "Morris Keesan" <mkeesan@post.harvard.edu> - 2011-09-10 17:16 -0400
Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-10 10:03 +0200
Re: hexump.c Nobody <nobody@nowhere.com> - 2011-09-10 10:04 +0100
Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-10 11:41 +0200
Re: hexump.c pete <pfiland@mindspring.com> - 2011-09-10 05:51 -0400
Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-10 12:38 +0200
Re: hexump.c Nobody <nobody@nowhere.com> - 2011-09-10 17:53 +0100
Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-10 12:46 +0200
Re: hexump.c Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-09-10 13:03 +0100
Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-10 15:34 +0200
Re: hexump.c "Morris Keesan" <mkeesan@post.harvard.edu> - 2011-09-10 17:37 -0400
Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-11 00:10 +0200
Re: hexump.c Patrick Scheible <kkt@zipcon.net> - 2011-09-10 21:03 -0700
Re: hexump.c Barry Schwarz <schwarz45@yahoo.com> - 2011-09-11 00:37 -0700
Re: hexump.c jacob navia <jacob@spamsink.net> - 2011-09-11 13:56 +0200
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