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fuzzing/oss-fuzz: strip RUNPATH from dependencies

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Strip all RUNPATH headers from all dependency shared objects that
we copy to the fuzzing target, as those libraries aren't placed
in their original place.

Signed-off-by: Uri Simchoni <uri@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
This commit is contained in:
Uri Simchoni 2021-09-06 22:55:55 +03:00 committed by Andrew Bartlett
parent f94b1d3b31
commit 4f300d672a
1 changed files with 14 additions and 0 deletions
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14
lib/fuzzing/oss-fuzz/do_build.sh
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@ -270,6 +270,20 @@ do
done
# Strip RUNPATH: or RPATH: entries from shared libraries copied over to $OUT/lib.
# When those libraries get loaded and have further dependencies, a RUNPATH: header
# will cause the dynamic linker to search in the runpath, and not in $OUT/lib,
# and there's no way it will be found in the fuzzing env.
#
# So how is the indirect depedency found in $OUT/lib? Well, suppose the fuzzer binary
# links library A which links library B. During linking, both A and B as listed in the
# executable file's runtime dependencies (This was pioneered in Fedora 13 in 2010, but
# is common behavior now). So we have the fuzzer binary with RPATH set to $OUT/lib, and
# a dependency on library B, and it will therefor find library B in $OUT/lib. On the
# hand, if we keep the RUNPATH in library A, and load A first, it will try loading
# library B as a dependency of A from the wrong place.
chrpath -d $OUT/lib/*
# Grap the seeds dictionary from github and put the seed zips in place
# beside their executables.