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Message-ID: <CAGw6cBstQ772esFVYaOrH2w-M2u8CU+qFh3WviV7cEHN5XfSdw@mail.gmail.com>
Date: Mon, 4 Apr 2022 20:57:34 -0700
From: Michael Forney <mforney@...rney.org>
To: musl@...ts.openwall.com
Cc: Colin Cross <ccross@...gle.com>
Subject: Re: [PATCH] dl_iterate_phdr: return empty string for the name
of the main program
On 2022-04-04, Colin Cross <ccross@...gle.com> wrote:
> The glibc man page for dl_iterate_phdr states:
> The first object visited by callback is the main program. For the main
> program, the
> dlpi_name field will be an empty string.
>
> This is relied upon by the LLVM ASAN runtime:
> https://github.com/llvm/llvm-project/blob/72ec2f76396fe5de5397bfb898993fdb22e2b0da/compiler-rt/lib/asan/asan_linux.cpp#L135
>
> Without this patch, running a binary that has been instrumented with
> ASAN fails with:
> ==4156919==ASan runtime does not come first in initial library list; you
> should either link runtime to your application or manually preload it with
> LD_PRELOAD.
>
> 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 attempted to fix this generically here:
https://reviews.llvm.org/D119515
Unfortunately, it seems to have caused some breakage and got reverted,
but I wasn't able to reproduce it and nobody offered any pointers
about how I might go about reproducing it. Any help moving forward
with that would be appreciated.
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