[cfe-users] MSAN blacklist

[Evgenii Stepanov via cfe-users]

This is a report from an interceptor, it is not affected by blacklist,
unfortunately.
You could try MSAN_OPTIONS=intercept_strlen=0, but it is likely that
something else will pop up instead.
Try figuring out what is the actual reason for the report, i.e. what
code is supposed to initialize this memory. Is it some other library
that can be built with MSan?

A better place for such questions is https://github.com/google/sanitizers/issues

On Mon, Jan 29, 2018 at 5:59 AM, Bernd Schubert via cfe-users
<cfe-users at lists.llvm.org> wrote:
> Hello,
>
> I would like to blacklist some warnings, but everything I tried
> so far is ignored.
>
> # cat msan-blacklist.txt
> fun:*interceptor_strlen*
> fun:*foreach_dirinpath*
> fun:foreach_dirinpath
> fun:*interceptor_strrchr*
> fun:*try_dlopen*
> src:*/ltdl.c
> src:ltdl.c
>
> So I tried to blacklist all kind of combinations of the failing
> functions and also of the related file - without success. It always
> fails with the same issue.
>
>
>
> Uninitialized bytes in __interceptor_strlen at offset 0 inside
> [0x703000035370, 45)
> ==3968020==WARNING: MemorySanitizer: use-of-uninitialized-value
>     #0 0x7f0f587fa099 in foreach_dirinpath
> /home/bschubert/src/cci/gerrit/src/libltdl/ltdl.c:699:18
> [...]
>
>   Uninitialized value was created by a heap allocation
>     #0 0x453ebd in __interceptor_malloc (/tmp/ime-server-bernd.0+0x453ebd)
>     #1 0x7f0f568c0f7e in __argz_create_sep (/usr/lib64/libc.so.6+0x90f7e)
>     #2 0x7f0f585f7775 in _dl_fixup (/lib64/ld-linux-x86-64.so.2+0xe775)
>
> SUMMARY: MemorySanitizer: use-of-uninitialized-value
> /home/bschubert/src/cci/gerrit/src/libltdl/ltdl.c:699:18 in
> foreach_dirinpath
> Exiting
>
>
> libcci and the main project I'm working on is compiled liked this
>
> libtool: compile:  /opt/llvm-5.0.1/bin/clang -DHAVE_CONFIG_H -I.
> -DLTDLOPEN=libltdlc "-DLT_CONFIG_H=<config.h>" -DLTDL -I. -I. -Ilibltdl
> -I./libltdl -I./libltdl -ggdb3 -O2 -fsanitize=memory
> -fsanitize-memory-track-origins -fsanitize-memory-use-after-dtor
> -fsanitize-blacklist=msan-blacklist.txt -MT libltdlc_la-lt_dlloader.lo
> -MD -MP -MF .deps/libltdlc_la-lt_dlloader.Tpo -c lt_dlloader.c  -fPIC
> -DPIC -o .libs/libltdlc_la-lt_dlloader.o
>
>
> Any ideas?
>
>
> Thanks,
> Bernd
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