purge llvm better, remove old patch, ignore container overflow

Author: addisoncrump

fuzzers/libfuzzer/builder.Dockerfile

@@ -17,7 +17,7 @@ FROM $parent_image
 
 # Install dependencies.
 RUN apt-get update && \
-    apt-get remove -y llvm-10 && \
+    apt-get remove -y llvm-* clang-* && \
     apt-get install -y \
         build-essential \
         lsb-release wget software-properties-common gnupg && \

fuzzers/libfuzzer/fuzzer.py

@@ -53,6 +53,11 @@ def run_fuzzer(input_corpus, output_corpus, target_binary, extra_flags=None):
     os.makedirs(crashes_dir)
     os.makedirs(output_corpus)
 
+    if 'ASAN_OPTIONS' in os.environ:
+        os.environ['ASAN_OPTIONS'] += ':detect_container_overflow=0'
+    else:
+        os.environ['ASAN_OPTIONS'] = 'detect_container_overflow=0'
+
     # Enable symbolization if needed.
     # Note: if the flags are like `symbolize=0:..:symbolize=1` then
     # only symbolize=1 is respected.