[gnutls-devel] GnuTLS | New CI runner with clang combined ubsan+asan (!1151)

[Development of GNU's TLS library]

Nikos Mavrogiannopoulos commented on a discussion on .gitlab-ci.yml: https://gitlab.com/gnutls/gnutls/merge_requests/1151#note_276453141

> +  - ./bootstrap
> +  - export UBSAN_OPTIONS=print_stacktrace=1:report_error_type=1:suppressions=$(pwd)/devel/ubsan.supp
> +  - export LSAN_OPTIONS=suppressions=$(pwd)/devel/lsan.supp
> +  - export ASAN_SYMBOLIZER_PATH=/usr/bin/llvm-symbolizer
> +  - export CC=clang
> +  - export CXX=clang++
> +
> +# This makes several tests fail, needs discussion if helpful
> +#  - export CFLAGS="-std=c99 -O1 -g -Werror -fno-omit-frame-pointer -fsanitize=undefined,integer,nullability,bool,alignment,null,enum,address,leak,nonnull-attribute  -fno-sanitize-recover=all -fsanitize-recover=unsigned-integer-overflow -fsanitize-address-use-after-scope"
> +
> +# This is from OSS-Fuzz (20.12.2019)
> +  - export CFLAGS="-std=c99 -O1 -g -Werror -fno-omit-frame-pointer -fsanitize=array-bounds,bool,builtin,enum,float-divide-by-zero,function,integer-divide-by-zero,null,object-size,return,returns-nonnull-attribute,shift,signed-integer-overflow,unsigned-integer-overflow,unreachable,vla-bound,vptr,address,leak,alignment -fno-sanitize-recover=all -fsanitize-recover=unsigned-integer-overflow -fsanitize-address-use-after-scope"
> +
> +  - export CXXFLAGS="$CFLAGS"
> +
> +# --disable-tls13-interop because tests/suite/testcompat-tls13-openssl.sh fails with clang sanitizers 

It is strange. If compiled with clang and these options gnutls-cli` behaves differently when sending early data. The "new" behavior makes openssl s_server to quit and thus resumption which is what is tested by this test fails. When I compile with just clang-9 and not these flags it works. Could it be a bug of one of these sanitizers that we are seeing here?

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