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Date: Wed, 17 May 2017 11:01:03 +0200
From: u-uy74@...ey.se
To: musl@...ts.openwall.com
Subject: Re: Question about setting argv[0] when manually using
dynamic linker
On Tue, May 16, 2017 at 08:38:56PM -0400, John Regan wrote:
> Hi there - I was wondering if it's possible to somehow set argv[0] when
> calling the dynamic linker to load a program.
...
> I'd like to retain whatever was actually typed on the command line (in this
> case, set argv[0] to "app"), since many apps look at argv[0] to change
> behavior, ie - gzip vs gunzip.
>
> I tried seeing if there was some switch I could pass to the linker, etc -
> as far as I can tell, there's no easy way to do this.
Set argv[0] to whatever you need when you exec*() the dynamic loader,
which is straightforward with a binary wrapper (not with a shell).
A binary wrapper also adds less overhead then going through a shell.
There is imho hardly any incentive to put such functionalty into the
loader. I say this even though we are dependent here on such tricks,
to work around programs which insist on guessing things when not asked to.
Regards,
Rune
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