From: Peter Korsgaard <peter@korsgaard.com>
To: buildroot@busybox.net
Subject: [Buildroot] [PATCH] pkgconf: make wrapper relocatable
Date: Wed, 09 Mar 2016 16:06:48 +0100 [thread overview]
Message-ID: <87oaanzo53.fsf@dell.be.48ers.dk> (raw)
In-Reply-To: <56E038BC.6060300@mind.be> (Arnout Vandecappelle's message of "Wed, 9 Mar 2016 15:52:44 +0100")
>>>>> "Arnout" == Arnout Vandecappelle <arnout@mind.be> writes:
Hi,
>> well, if executed throyh a shell it will - But if I write code to call
>> execve I get to chose what argv[0] should be.
> Read the section "Interpreter scripts" of execve(2). argv[0] is discarded.
Ahh yes, for a script this would be true because of the shebang handling
in the kernel, but it is not true for normal ELF binaries.
>> That's another reason. If somebody does a symlink to our wrapper, then
>> $0 will contain the full path to the link, not to the wrapper
>> itself.
> So we need to readlink it first.
Yes, or read /proc/self/exec.
>> If somebody does a hardlink, /proc/self/exe won't even fix it for you -
>> But that is probably quite unlikely.
> For the hardlink case there is no solution.
Indeed.
--
Venlig hilsen,
Peter Korsgaard
next prev parent reply other threads:[~2016-03-09 15:06 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-09 13:16 [Buildroot] [PATCH] pkgconf: make wrapper relocatable Gustavo Zacarias
2016-03-09 13:46 ` Peter Korsgaard
2016-03-09 13:51 ` Gustavo Zacarias
2016-03-09 14:00 ` Peter Korsgaard
2016-03-09 14:04 ` Gustavo Zacarias
2016-03-09 14:31 ` Peter Korsgaard
2016-03-09 14:37 ` Arnout Vandecappelle
2016-03-09 14:40 ` Gustavo Zacarias
2016-03-09 14:46 ` Peter Korsgaard
2016-03-09 14:52 ` Arnout Vandecappelle
2016-03-09 15:06 ` Peter Korsgaard [this message]
2016-03-09 14:03 ` Thomas Petazzoni
2016-03-09 14:28 ` Gustavo Zacarias
2016-03-09 14:40 ` Arnout Vandecappelle
2016-03-09 14:41 ` Gustavo Zacarias
2016-03-09 14:42 ` Arnout Vandecappelle
2016-03-09 14:30 ` Peter Korsgaard
2016-03-09 14:50 ` Thomas Petazzoni
2016-03-09 14:55 ` Peter Korsgaard
2016-03-09 15:22 ` Samuel Martin
2016-03-09 15:55 ` Peter Korsgaard
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