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.
Powered by blists - more mailing lists
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.