Re: [LTP] [PATCH v2] security/dirtyc0w_shmem: Add new test for CVE-2022-2590

Cyril Hrubis
2022-11-25T14:33:57Z

Hi!
> I think the point is that there's no guarantee that NULL will actually
> be defined as (void*)0. It can be defined as a plain integer instead.
> And it *IS* defined as plain integer when the header is #included in C++.

NULL is required to be 0 cast to void* in POSIX.

https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/stddef.h.html

So at least on POSIX-like systems in C NULL must be ((void*)0)

--
Cyril Hrubis
chrubis@suse.cz