I did. I still maintain that the reason why the exploit doesn't work is this: include/asm-generic/atomic-long.h: #if BITS_PER_LONG == 64 typedef atomic64_

I did. I still maintain that the reason why the exploit doesn't work is this: include/asm-generic/atomic-long.h: #if BITS_PER_LONG == 64 typedef atomic64_t atomic_long_t; ... #else typedef atomic_t atomic_long_t; Just checking it with a 32-bit VM with the latest upstream kernel. EDIT: No, I was wrong. atomic_t is 32 bits also with 64 bit architecture. Must be something else then, let's see.