Add code and tests

code/.gitignore

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+gcc-9.2.0.tar.xz
+gcc-9.2.0.tar.xz.sig
+llvm-project.181ab91efc9.tar.xz
+clang.181ab91efc9
+gcc-9.2

code/build_clang.sh

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+#!/usr/bin/env sh
+
+mkdir build \
+  && cd build \
+  && cmake -DLLVM_ENABLE_PROJECTS=clang \
+    -DCMAKE_BUILD_TYPE=Release \
+    -G "Unix Makefiles" ../llvm \
+  && make -j8

code/build_gcc.sh

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+#!/usr/bin/env sh
+
+mkdir objdir \
+  && cd objdir \
+  && ../configure \
+    --build=x86_64-linux-gnu \
+    --host=x86_64-linux-gnu \
+    --target=x86_64-linux-gnu \
+    --disable-multilib \
+  && make -j8

code/checksec_result_clang.json

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+{ "vuln.clang": { "relro":"partial","canary":"no","nx":"yes","pie":"no","rpath":"no","runpath":"no","symbols":"yes","fortify_source":"no","fortified":"0","fortify-able":"0" } }

code/checksec_result_gcc.json

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+{ "vuln.gcc": { "relro":"partial","canary":"no","nx":"yes","pie":"no","rpath":"no","runpath":"no","symbols":"yes","fortify_source":"no","fortified":"0","fortify-able":"0" } }

code/vuln.c

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+#include<string.h>
+void vuln(char *input) {
+  char buf[50];
+  size_t len = strlen(input);
+  for (size_t i = 0; i < len; i++) {
+    buf[i] = input[i];
+  }
+}
+int main(int argc, char **argv) {
+  vuln(argv[1]);
+  return 0;
+}
+