Date: Fri, 22 May 2020 13:33:00 -0400 From: Rich Felker <dalias@...c.org> To: Harald Welte <laforge@...monks.org> Cc: musl@...ts.openwall.com Subject: Re: MUSL ignores__attribute__((constructor(priority))) ? On Fri, May 22, 2020 at 06:50:06PM +0200, Harald Welte wrote: > Hi Rich, > > On Thu, May 21, 2020 at 05:49:48PM -0400, Rich Felker wrote: > > > According to the OpenWRT build I have been provided by a 3rd party, it's > > > using musl-1-1.23. > > > > Can you confirm this to make sure we're not debugging an issue that's > > long since fixed? Run /lib/ld-musl-armhf.so.1 as a command and it will > > print its version. > > *sigh*. It was 1.1.20. This specific (vendor) OpenWRT tree was broken in that > it used the 1.1.20 source code but called the generated packages and > path names 1.1.23 :/ > > After updating the sources to actual 1.1.23, the constructor order is > correct and I can run the unmodified libraries + application just like > on glibc. > > Sorry for the noise then. Normally if something is named 1.1.23 you > assume it also is 1.1.23 inside... OK, I'll inquire with OpenWRT about what's going on here.. > > FWIW the only standards that musl purports to actually adhere to are > > C, POSIX, and IEEE 754 (as referenced by C Annex F). While ELF is the > > binary format used and we aim to use it in compatible ways so as not > > to be gratuitously breaking, there are a lot of details that do not > > match historical SysV behavior (this is also true on glibc to a lesser > > extent), e.g. historical RPATH vs RUNPATH difference, LD_* vars, etc. > > Does that explain why trying to LD_PRELOAD libtalloc didn't fix the > ordering either? It was one humble attempt at manually overriding the > order (on 1.1.20). Yes, old behavior was execution in reverse load order. This gave something like dependency order for some very simple dependency structures, but for LD_PRELOAD it resulted in the preloaded library's ctors running _last_. Rich
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