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+a
+    According to https://en.wikipedia.org/wiki/Control_register#CR4, the SMAP and SMEP bits are used to protect ring 0.
+    If writing to CR4 would be allowed, we could disable this protection, and access kernel space data (e.g.)
+
+b
+    0x40050e <main+8>           mov     %cr4,%rax
+
+    This attempts to move the RAX register to the CR4 register, i.e. to write to CR4.
+
+c
+    Done. I suppose it isn't necessary to give you the code or results, as all was needed was copying from the given website.
+
+d
+    See hello-cr4.c and Makefile.
+    
+    # make
+    [..]
+    # insmod hello-cr4.ko
+    [15892.352286] Hello world! CR4 =         7f0
+