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Now, that is an 'interesting' bug.  ctypes.util.find_library
does execute shell commands that happen to have '/dev/null'
in them, but it is completely unclear to me how one can
overwrite /dev/null (even if root).  Can you see anything
that's wrong there (That code is not from me, and I'm not at
all an expert in linux programming)?

BTW, I cannot reproduce this on ubuntu with 'sudo ./python
-c "import ctypes.test.test_find"'.