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"Оптимизация кода компилятором может привести к появлению про..." Отправлено Дмитрий, 30-Окт-13 12:23
Если почитать оригинал (http://lwn.net/Articles/342330/) There is one little problem with that reasoning, though: NULL (zero) can actually be a valid pointer address. By default, the very bottom of the virtual address space (the "zero page," along with a few pages above it) is set to disallow all access as a way of catching null-pointer bugs (like the one described above) in both user and kernel space. But it is possible, using the mmap() system call, to put real memory at the bottom of the virtual address space. There are some valid use cases for this functionality, including running legacy binaries.