Re: [libmicrohttpd] GNU libmicrohttpd 0.9.74 released

[Evgeny Grin]

Hi Markus,

Thanks for the report.
Unfortunatelly ASAN documentation is not very precise about manual 
poisoning/unpoisoning, however I think memory must be *unpoisoned* 
before freeing, just because memory is not poisoned when allocated.

Should be fixed by 
https://git.gnunet.org/libmicrohttpd.git/commit/?id=1a46bfd6e0929e2004ffda318282cbf21d9f5299

Please check whether it fixed the issue for you.

--
Evgeny


On 07.03.2022 20:11, Markus Doppelbauer wrote:
>  > + Added '--enable-sanitizers[=address,undefined,leak,user-poison]'
>  >    configure parameter (instead of '--enable-sanitizer'),
>  >    implemented custom memory poisoning for memory pools.
>
> We get strange asan aborts (maybe once per 30min):
>     ERROR: AddressSanitizer: use-after-poison on address 0xdeadbeef
>
> My question (sorry I can't find any docs on this issue):
> MHD calls '_MHD_POISON_MEMORY()' before 'free()'.
>
> Other code calls 'ASAN_UNPOISON_MEMORY_REGION()' before free, e.g.:
> https://github.com/AlxHnr/CRegion/blob/1347314d953e8b5e26eed3b0fe3151e482958c39/src/mempool.c#L69 
> <https://github.com/AlxHnr/CRegion/blob/1347314d953e8b5e26eed3b0fe3151e482958c39/src/mempool.c#L69>

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