From: Kees Cook <keescook@chromium.org>
To: Matteo Rizzo <matteorizzo@google.com>
Cc: cl@linux.com, penberg@kernel.org, rientjes@google.com,
iamjoonsoo.kim@lge.com, akpm@linux-foundation.org,
vbabka@suse.cz, roman.gushchin@linux.dev, 42.hyeyoo@gmail.com,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
linux-mm@kvack.org, linux-hardening@vger.kernel.org,
tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com,
corbet@lwn.net, luto@kernel.org, peterz@infradead.org,
jannh@google.com, evn@google.com, poprdi@google.com,
jordyzomer@google.com, ardb@google.com
Subject: Re: [RFC PATCH 10/14] x86: Create virtual memory region for SLUB
Date: Fri, 15 Sep 2023 14:13:03 -0700 [thread overview]
Message-ID: <202309151410.E65B8300F@keescook> (raw)
In-Reply-To: <20230915105933.495735-11-matteorizzo@google.com>
On Fri, Sep 15, 2023 at 10:59:29AM +0000, Matteo Rizzo wrote:
> From: Jann Horn <jannh@google.com>
>
> SLAB_VIRTUAL reserves 512 GiB of virtual memory and uses them for both
> struct slab and the actual slab memory. The pointers returned by
> kmem_cache_alloc will point to this range of memory.
I think the 512 GiB limit may be worth mentioning in the Kconfig help
text.
And in the "640K is enough for everything" devil's advocacy, why is 512
GiB enough here? Is there any greater risk of a pathological allocation
pattern breaking a system any more (or less) than is currently possible?
>
> Signed-off-by: Jann Horn <jannh@google.com>
But, yes, I'm still a fan, and I think it interacts well here with the
rest of the KASLR initialization:
Reviewed-by: Kees Cook <keescook@chromium.org>
Have you tried to make this work on arm64? I imagine it should be
roughly as easy?
--
Kees Cook
next prev parent reply other threads:[~2023-09-15 21:13 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-15 10:59 [RFC PATCH 00/14] Prevent cross-cache attacks in the SLUB allocator Matteo Rizzo
2023-09-15 10:59 ` [RFC PATCH 01/14] mm/slub: don't try to dereference invalid freepointers Matteo Rizzo
2023-09-15 20:50 ` Kees Cook
2023-09-30 11:04 ` Hyeonggon Yoo
2023-09-15 10:59 ` [RFC PATCH 02/14] mm/slub: add is_slab_addr/is_slab_page helpers Matteo Rizzo
2023-09-15 20:55 ` Kees Cook
2023-09-15 10:59 ` [RFC PATCH 03/14] mm/slub: move kmem_cache_order_objects to slab.h Matteo Rizzo
2023-09-15 20:56 ` Kees Cook
2023-09-15 10:59 ` [RFC PATCH 04/14] mm: use virt_to_slab instead of folio_slab Matteo Rizzo
2023-09-15 20:59 ` Kees Cook
2023-09-15 10:59 ` [RFC PATCH 05/14] mm/slub: create folio_set/clear_slab helpers Matteo Rizzo
2023-09-15 21:02 ` Kees Cook
2023-09-15 10:59 ` [RFC PATCH 06/14] mm/slub: pass additional args to alloc_slab_page Matteo Rizzo
2023-09-15 21:03 ` Kees Cook
2023-09-15 10:59 ` [RFC PATCH 07/14] mm/slub: pass slab pointer to the freeptr decode helper Matteo Rizzo
2023-09-15 21:06 ` Kees Cook
2023-09-15 10:59 ` [RFC PATCH 08/14] security: introduce CONFIG_SLAB_VIRTUAL Matteo Rizzo
2023-09-15 21:07 ` Kees Cook
2023-09-15 10:59 ` [RFC PATCH 09/14] mm/slub: add the slab freelists to kmem_cache Matteo Rizzo
2023-09-15 21:08 ` Kees Cook
2023-09-15 10:59 ` [RFC PATCH 10/14] x86: Create virtual memory region for SLUB Matteo Rizzo
2023-09-15 21:13 ` Kees Cook [this message]
2023-09-15 21:49 ` Dave Hansen
2023-09-18 8:54 ` Matteo Rizzo
2023-09-15 10:59 ` [RFC PATCH 11/14] mm/slub: allocate slabs from virtual memory Matteo Rizzo
2023-09-15 21:22 ` Kees Cook
2023-09-15 21:57 ` Dave Hansen
2023-10-11 9:17 ` Matteo Rizzo
2023-09-15 10:59 ` [RFC PATCH 12/14] mm/slub: introduce the deallocated_pages sysfs attribute Matteo Rizzo
2023-09-15 21:23 ` Kees Cook
2023-09-15 10:59 ` [RFC PATCH 13/14] mm/slub: sanity-check freepointers Matteo Rizzo
2023-09-15 21:26 ` Kees Cook
2023-09-15 10:59 ` [RFC PATCH 14/14] security: add documentation for SLAB_VIRTUAL Matteo Rizzo
2023-09-15 21:34 ` Kees Cook
2023-09-20 9:04 ` Vlastimil Babka
2023-09-15 15:19 ` [RFC PATCH 00/14] Prevent cross-cache attacks in the SLUB allocator Dave Hansen
2023-09-15 16:30 ` Lameter, Christopher
2023-09-18 12:08 ` Matteo Rizzo
2023-09-18 17:39 ` Ingo Molnar
2023-09-18 18:05 ` Linus Torvalds
2023-09-19 15:48 ` Matteo Rizzo
2023-09-19 16:02 ` Dave Hansen
2023-09-19 17:56 ` Kees Cook
2023-09-19 18:49 ` Linus Torvalds
2023-09-19 13:42 ` Matteo Rizzo
2023-09-19 15:56 ` Dave Hansen
2023-09-20 7:44 ` Ingo Molnar
2023-09-20 8:49 ` Vlastimil Babka
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=202309151410.E65B8300F@keescook \
--to=keescook@chromium.org \
--cc=42.hyeyoo@gmail.com \
--cc=akpm@linux-foundation.org \
--cc=ardb@google.com \
--cc=bp@alien8.de \
--cc=cl@linux.com \
--cc=corbet@lwn.net \
--cc=dave.hansen@linux.intel.com \
--cc=evn@google.com \
--cc=hpa@zytor.com \
--cc=iamjoonsoo.kim@lge.com \
--cc=jannh@google.com \
--cc=jordyzomer@google.com \
--cc=linux-doc@vger.kernel.org \
--cc=linux-hardening@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=luto@kernel.org \
--cc=matteorizzo@google.com \
--cc=mingo@redhat.com \
--cc=penberg@kernel.org \
--cc=peterz@infradead.org \
--cc=poprdi@google.com \
--cc=rientjes@google.com \
--cc=roman.gushchin@linux.dev \
--cc=tglx@linutronix.de \
--cc=vbabka@suse.cz \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox