mirror of https://github.com/google/oss-fuzz.git
dcd35e272f
`isc__initialize()` is a libisc function that is marked with `__attribute__((constructor))`; it works as expected when the library is linked dynamically, but it gets stripped away in static builds prepared by OSS-Fuzz as it is not called directly by any of the fuzzers. However, one of the fuzzers (`fuzz/dns_message_checksig.c`) calls `dns_view_create()`, which calls `isc_file_sanitize()`, which in turn calls `isc_md(ISC_MD_SHA256, ...)`. The latter does not work unless `isc__md_initialize()` is called beforehand and that function is in turn expected to be called by `isc__initialize()`. Since the latter is absent from OSS-Fuzz builds, the `dns_message_checksig` fuzzer crashes on every input. Since this is only an issue for static builds, which BIND 9 currently does not support except for OSS-Fuzz specifically, use the `-u` linker flag to force-link `isc__initialize()` into the fuzzer binaries. Also force-link `isc__shutdown()` (a libisc destructor) for consistency. |
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