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Message-ID: <20220411145802.GQ7074@brightrain.aerifal.cx>
Date: Mon, 11 Apr 2022 10:58:02 -0400
From: Rich Felker <dalias@...c.org>
To: Jeffrey Walton <noloader@...il.com>
Cc: musl@...ts.openwall.com, Colin Cross <ccross@...gle.com>
Subject: Re: [PATCH] dl_iterate_phdr: return empty string for the name
of the main program
On Mon, Apr 11, 2022 at 10:03:47AM -0400, Jeffrey Walton wrote:
> On Mon, Apr 11, 2022 at 8:42 AM Rich Felker <dalias@...c.org> wrote:
> >
> > On Mon, Apr 11, 2022 at 08:24:21AM -0400, Jeffrey Walton wrote:
> > > On Mon, Apr 4, 2022 at 11:57 PM Michael Forney <mforney@...rney.org> wrote:
> > > >
> > > > ...
> > > > > Use a constant empty string instead of the DSO name field for the first
> > > > > entry in the DSO list.
> > > >
> > > > I believe glibc is the exception here, not musl. When I looked at
> > > > this, every other operating system I tried used the program name for
> > > > the first object.
> > >
> > > I may be splitting hairs, but the dl_iterate_phdr(3) man page does not
> > > say a program is returned during the enumeration. It says shared
> > > objects are returned.
> >
> > You are. The intent, actual practice -- and absolute necessity for
> > this function to serve its purpose, which includes admiting the
> > implementation of exception handling -- is that it be included. And in
> > this context, the (dynamic linked) program *is* a shared object.
>
> I think you are conflating ET_DYN with a shared object. The presence
> of ET_DYN does not make a program a shared object, it merely means the
> object is relocatable (i.e., position independent code).
No, I'm not. What makes it a shared object is that it's one of the
objects processed by the dynamic linker with a _DYNAMIC object,
dynamic symbol table, dynamic relocation section, etc. whose symbols
are shared with other shared objects at runtime.
Rich
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