linux-hardening - Re: [PATCH] netfs: Use container

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Message-ID: <2953403.1652887264@warthog.procyon.org.uk>
Date:   Wed, 18 May 2022 16:21:04 +0100
From:   David Howells <dhowells@...hat.com>
To:     David Laight <David.Laight@...LAB.COM>
Cc:     dhowells@...hat.com, Kees Cook <keescook@...omium.org>,
        Jeff Layton <jlayton@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hardening@...r.kernel.org" <linux-hardening@...r.kernel.org>
Subject: Re: [PATCH] netfs: Use container_of() for offset casting

David Laight <David.Laight@...LAB.COM> wrote:

> Can't you just name the structure so it is:
> 
> 	struct afs_vnode {
>  		struct netfs_i_c_pair {
>  			/* These must be contiguous */
>  			struct inode	vfs_inode;
>  			struct netfs_i_context netfs_ctx;
>  		};
>  		...
>  	};

No.  C won't let you do that (the same thing has to be done in 9p, ceph as
well, and at some point hopefully cifs and nfs too).

David