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<flokli>
hoof, any recommendations on how to chase dlopen calls? Let's say I want to package something producing multiple binaries, shared libraries etc., and I don't exactly know where the dlopen() calls end up in (and this could even change over time). Is there a way to tell the compiler/linker to "add some notes" to the ELF, so this is easier to find and add later on?
<sphalerite>
flokli: hook in a logging wrapper for dlopen using LD_PRELOAD?
<flokli>
I don't want to instrument it after build
<flokli>
I'm thinking more about marking these functions external, and looking at the symbol table
<sphalerite>
hm, shouldn't the symbol table and the memory map help you work out what comes from which file?
<sphalerite>
or am I still misunderstanding what you want to achieve?
<JJJollyjim>
i don't really follow
<JJJollyjim>
you want to statically analyze the names of functions that will be imported via dlopen?
<flokli>
I want to "taint" functions running dlopen, so I can later inspect the ELF and add to RUNPATH where needed
<flokli>
I thought about externally_visible
<flokli>
let's say, on the compiled thing, I search for "dlopen_libfoobar", and add ${foobar}/lib to its RUNPATH if I can find it
<JJJollyjim>
ahh, cos dlopen_libfoobar is in some subset of the produced binariess
<JJJollyjim>
got it
<flokli>
or libraries
<flokli>
yes
<flokli>
does that make any sense?
<JJJollyjim>
yeah
<flokli>
I mean, static analysis on all of the binary blurb in all ELF-typed files in the output, looking for dlopen calls and the string it's called with would be the alternative
<flokli>
but it's probably much more complicated and error-prone
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<flokli>
mmmhhh… apparently externally_visible is ignored, meh
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<flokli>
oh, it's not ignored
<flokli>
but binaries don't need to expose their symbols in the ELF ;-)
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* lukegb
looks at nixos-unstable
* lukegb
sighs
<gchristensen>
what's the blocker?
<lukegb>
various tests, simpleUefiSystemBoot atm
<gchristensen>
ouch
<lukegb>
one of the tests looked like it might've been stuck due to, err, needing udev to do a thing, but not actually waiting for it
<lukegb>
I can't help but feel like a lot of the nixos tests end up like that (just lucking out on $asynchronous_thing happening in background rather than waiting for it to happen)
<gchristensen>
those would be good bugs to fix... they're tricky ones
<lukegb>
yeah
<lukegb>
ah, actually, simpleUefiSystemdBoot seems broken because the qemu invocation is broken
<lukegb>
(fixed in 57a787c9fa91f149c86a1ce83d57e07cfa589e07)
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<JJJollyjim>
i saw a facebook engineering blog post about statistical methods for figuring out which tests are unreliable
<JJJollyjim>
but I can't find it now
<qyliss>
sure it wasn't github? they published one just like that the other day