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Message-ID: <CA+qPFcL4JzAbNXiL_0oFhTBfAH3+gBYfpeyc0Ved+ZmYMG1D=A@mail.gmail.com>
Date: Wed, 17 May 2017 11:00:35 +0000
From: mzpqnxow <musl@...qnxow.com>
To: musl@...ts.openwall.com
Subject: Re: Question about setting argv[0] when manually using dynamic linker
Is there any reason you want to avoid simply statically linking the
program(s) so that it needs no libc or other shared objects at all?
Or did I misunderstand what you're trying to do?
On Wed, May 17, 2017 at 05:05 <u-uy74@...ey.se> wrote:
> 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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