From: Baruch Siach <baruch@tkos.co.il>
To: Kees Cook <keescook@chromium.org>
Cc: LKML <linux-kernel@vger.kernel.org>, Jan Kara <jack@suse.cz>,
"kernel-hardening@lists.openwall.com"
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"David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH 1/9] mm: Hardened usercopy
Date: Thu, 7 Jul 2016 21:35:59 +0300 [thread overview]
Message-ID: <20160707183559.GR2118@tarshish> (raw)
In-Reply-To: <CAGXu5jJV4ZQp4VQ44SPQ49RxXpFXzx6d233A3+_Ka7txYHmuMw@mail.gmail.com>
Hi Kees,
On Thu, Jul 07, 2016 at 01:25:21PM -0400, Kees Cook wrote:
> On Thu, Jul 7, 2016 at 1:37 AM, Baruch Siach <baruch@tkos.co.il> wrote:
> > On Wed, Jul 06, 2016 at 03:25:20PM -0700, Kees Cook wrote:
> >> +#ifdef CONFIG_HAVE_HARDENED_USERCOPY_ALLOCATOR
> >
> > Should be CONFIG_HARDENED_USERCOPY to match the slab/slub implementation
> > condition.
> >
> >> +const char *__check_heap_object(const void *ptr, unsigned long n,
> >> + struct page *page);
> >> +#else
> >> +static inline const char *__check_heap_object(const void *ptr,
> >> + unsigned long n,
> >> + struct page *page)
> >> +{
> >> + return NULL;
> >> +}
> >> +#endif
>
> Hmm, I think what I have is correct: if the allocator supports the
> heap object checking, it defines __check_heap_object as existing via
> CONFIG_HAVE_HARDENED_USERCOPY_ALLOCATOR. If usercopy checking is done
> at all is controlled by CONFIG_HARDENED_USERCOPY.
>
> I.e. you can have the other usercopy checks even if your allocator
> doesn't support object size checking.
Right. I missed the fact that usercopy.c build also depends on
CONFIG_HARDENED_USERCOPY. Sorry for the noise.
baruch
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next prev parent reply other threads:[~2016-07-07 18:36 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-06 22:25 [PATCH 0/9] mm: Hardened usercopy Kees Cook
2016-07-06 22:25 ` [PATCH 1/9] " Kees Cook
2016-07-07 5:37 ` Baruch Siach
2016-07-07 17:25 ` Kees Cook
2016-07-07 18:35 ` Baruch Siach [this message]
2016-07-07 7:42 ` Thomas Gleixner
2016-07-07 17:29 ` Kees Cook
2016-07-07 19:34 ` Thomas Gleixner
2016-07-07 8:01 ` Arnd Bergmann
2016-07-07 17:37 ` Kees Cook
2016-07-08 5:34 ` Michael Ellerman
2016-07-08 5:34 ` Michael Ellerman
2016-07-08 5:34 ` Michael Ellerman
2016-07-08 5:34 ` Michael Ellerman
2016-07-08 9:22 ` Arnd Bergmann
2016-07-07 16:19 ` Rik van Riel
2016-07-07 16:35 ` Rik van Riel
2016-07-07 17:41 ` Kees Cook
2016-07-06 22:25 ` [PATCH 2/9] x86/uaccess: Enable hardened usercopy Kees Cook
2016-07-06 22:25 ` [PATCH 3/9] ARM: uaccess: " Kees Cook
2016-07-06 22:25 ` [PATCH 4/9] arm64/uaccess: " Kees Cook
2016-07-07 10:07 ` Mark Rutland
2016-07-07 17:19 ` Kees Cook
2016-07-06 22:25 ` [PATCH 5/9] ia64/uaccess: " Kees Cook
2016-07-06 22:25 ` [PATCH 6/9] powerpc/uaccess: " Kees Cook
2016-07-06 22:25 ` [PATCH 7/9] sparc/uaccess: " Kees Cook
2016-07-06 22:25 ` [PATCH 8/9] mm: SLAB hardened usercopy support Kees Cook
2016-07-06 22:25 ` [PATCH 9/9] mm: SLUB " Kees Cook
2016-07-07 4:35 ` Michael Ellerman
2016-07-07 4:35 ` Michael Ellerman
2016-07-07 4:35 ` Michael Ellerman
2016-07-07 4:35 ` Michael Ellerman
[not found] ` <577ddc18.d351190a.1fa54.ffffbe79SMTPIN_ADDED_BROKEN@mx.google.com>
2016-07-07 18:56 ` [kernel-hardening] " Kees Cook
2016-07-08 10:19 ` Michael Ellerman
2016-07-08 10:19 ` Michael Ellerman
2016-07-08 10:19 ` Michael Ellerman
2016-07-08 10:19 ` [kernel-hardening] " Michael Ellerman
2016-07-07 7:30 ` [PATCH 0/9] mm: Hardened usercopy Christian Borntraeger
2016-07-07 17:27 ` Kees Cook
2016-07-08 8:46 ` Ingo Molnar
2016-07-08 16:19 ` Linus Torvalds
2016-07-08 18:23 ` Ingo Molnar
2016-07-09 2:22 ` Laura Abbott
2016-07-09 2:44 ` Rik van Riel
2016-07-09 7:55 ` Ingo Molnar
2016-07-09 8:25 ` Ard Biesheuvel
2016-07-09 12:58 ` Laura Abbott
2016-07-09 17:03 ` Kees Cook
2016-07-09 17:01 ` Kees Cook
2016-07-09 21:27 ` Andy Lutomirski
2016-07-09 23:16 ` PaX Team
2016-07-10 9:16 ` Ingo Molnar
2016-07-10 12:03 ` PaX Team
2016-07-10 12:38 ` Andy Lutomirski
2016-07-11 18:40 ` Kees Cook
2016-07-11 18:34 ` Kees Cook
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