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Message-ID: <20180116210313.GA7791@bombadil.infradead.org>
Date: Tue, 16 Jan 2018 13:03:13 -0800
From: Matthew Wilcox <willy@...radead.org>
To: Christopher Lameter <cl@...ux.com>
Cc: Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org,
David Windsor <dave@...lcore.net>,
Pekka Enberg <penberg@...nel.org>,
David Rientjes <rientjes@...gle.com>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
linux-xfs@...r.kernel.org,
Linus Torvalds <torvalds@...ux-foundation.org>,
Alexander Viro <viro@...iv.linux.org.uk>,
Andy Lutomirski <luto@...nel.org>,
Christoph Hellwig <hch@...radead.org>,
"David S. Miller" <davem@...emloft.net>,
Laura Abbott <labbott@...hat.com>,
Mark Rutland <mark.rutland@....com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Christian Borntraeger <borntraeger@...ibm.com>,
Christoffer Dall <christoffer.dall@...aro.org>,
Dave Kleikamp <dave.kleikamp@...cle.com>, Jan Kara <jack@...e.cz>,
Luis de Bethencourt <luisbg@...nel.org>,
Marc Zyngier <marc.zyngier@....com>, Rik van Riel <riel@...hat.com>,
Matthew Garrett <mjg59@...gle.com>, linux-fsdevel@...r.kernel.org,
linux-arch@...r.kernel.org, netdev@...r.kernel.org,
kernel-hardening@...ts.openwall.com
Subject: Re: kmem_cache_attr (was Re: [PATCH 04/36] usercopy: Prepare for
usercopy whitelisting)
On Tue, Jan 16, 2018 at 12:17:01PM -0600, Christopher Lameter wrote:
> Draft patch of how the data structs could change. kmem_cache_attr is read
> only.
Looks good. Although I would add Kees' user feature:
struct kmem_cache_attr {
char name[16];
unsigned int size;
unsigned int align;
+ unsigned int useroffset;
+ unsigned int usersize;
slab_flags_t flags;
kmem_cache_ctor ctor;
}
And I'd start with
+struct kmem_cache *kmem_cache_create_attr(const kmem_cache_attr *);
leaving the old kmem_cache_create to kmalloc a kmem_cache_attr and
initialise it.
Can we also do something like this?
-#define KMEM_CACHE(__struct, __flags) kmem_cache_create(#__struct,\
- sizeof(struct __struct), __alignof__(struct __struct),\
- (__flags), NULL)
+#define KMEM_CACHE(__struct, __flags) ({ \
+ const struct kmem_cache_attr kca ## __stringify(__struct) = { \
+ .name = #__struct, \
+ .size = sizeof(struct __struct), \
+ .align = __alignof__(struct __struct), \
+ .flags = (__flags), \
+ }; \
+ kmem_cache_create_attr(&kca ## __stringify(__struct)); \
+})
That way we won't need to convert any of those users.
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