[Bug 40330] Build fails with AddressSanitizer.

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=40330

--- Comment #13 from Kyle Auble <kyle.auble at zoho.com> ---
Ah, this bug is a veritable hydra!

I was just thinking some, and I realized that in addition to the sfnt2fon and
memory conflicts, the Wine preloader is linked statically. Is that possibly
causing any problems, or are ASan and Wine's configure smart enough to ignore
the "fsanitize" flag when building the preloader?

(In reply to Austin English from comment #11)
> Short answer is
> https://source.winehq.org/git/wine.git/blob/HEAD:/tools/sfnt2fon/sfnt2fon.
> c#l577

I wasn't sure how accurate the line-numbers for ASan were, but that's nice that
it lands close to the actual problem.

(In reply to Austin English from comment #12)
> Though after getting it to build, running wine fails; looks like the
> preloader interferes with ASAN:
> ==9822==Shadow memory range interleaves with an existing memory mapping.
> 
> ...
> 
> I tried the LD_PRELOAD workaround:
> export ASAN_OPTIONS=halt_on_error=0
> export LD_PRELOAD="/usr/lib64/gcc/x86_64-pc-linux-gnu/7.3.0/libasan.so.4
> /usr/lib64/gcc/x86_64-pc-linux-gnu/7.3.0/32/libasan.so.4"
> 
> as well as -fsanitize-recover=address, but none of those helped. From a
> quick glance at ASAN bugs, sounds like it's a WONTFIX.

I guess this is the real essence of the bug; maybe we should note the runtime
conflict with the preloader in the title? You're probably right that working
around the preloader would probably qualify as WONTFIX for the ASan team.

However, setting aside practicality for a second and looking at it as "do the
right thing," couldn't the Wine preloader and ASan theoretically respect each
other? Doesn't Wine need the preloader to reserve specific memory addresses
whereas ASan only needs to preemptively reserve some range for shadow memory?
Or am I completely misunderstanding?

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