linux-kernel - Re: [GIT PULL] usercopy protection for v4.8

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Date:	Tue, 26 Jul 2016 20:53:29 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Laura Abbott <labbott@...hat.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Valdis Kletnieks <valdis.kletnieks@...edu>
Subject: Re: [GIT PULL] usercopy protection for v4.8

On Tue, Jul 26, 2016 at 2:55 PM, Kees Cook <keescook@...omium.org> wrote:
> Hi,
>
> This is my next pull request for v4.8, which introduces a kernel self
> protection of copy_to_user/copy_from_user that has been under review and
> test on the kernel-hardening list for a while. It has lived for a bit
> in -next, and appears to be ready IMO. There will be more improvements
> in the future, but this is a solid start.
>
> Again, if I can improve these pull request emails in any way, please
> let me know. :)

Hrm, part of the complexity of the KSPP work: this series depends on
_etext fixes in the arm and arm64 trees, so this should likely wait
until those trees are pulled.

-Kees

>
> Thanks!
>
> -Kees
>
> The following changes since commit 523d939ef98fd712632d93a5a2b588e477a7565e:
>
>   Linux 4.7 (2016-07-24 12:23:50 -0700)
>
> are available in the git repository at:
>
>   git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git tags/usercopy-v4.8
>
> for you to fetch changes up to ed18adc1cdd00a5c55a20fbdaed4804660772281:
>
>   mm: SLUB hardened usercopy support (2016-07-26 14:43:54 -0700)
>
> ----------------------------------------------------------------
> Implements HARDENED_USERCOPY verification of copy_to_user/copy_from_user
> bounds checking for most architectures on SLAB and SLUB.
>
> ----------------------------------------------------------------
> Kees Cook (11):
>       mm: Implement stack frame object validation
>       mm: Hardened usercopy
>       x86/uaccess: Enable hardened usercopy
>       ARM: uaccess: Enable hardened usercopy
>       arm64/uaccess: Enable hardened usercopy
>       ia64/uaccess: Enable hardened usercopy
>       powerpc/uaccess: Enable hardened usercopy
>       sparc/uaccess: Enable hardened usercopy
>       s390/uaccess: Enable hardened usercopy
>       mm: SLAB hardened usercopy support
>       mm: SLUB hardened usercopy support
>
> Laura Abbott (1):
>       mm: Add is_migrate_cma_page
>
>  arch/Kconfig                        |   9 ++
>  arch/arm/Kconfig                    |   1 +
>  arch/arm/include/asm/uaccess.h      |  11 +-
>  arch/arm64/Kconfig                  |   1 +
>  arch/arm64/include/asm/uaccess.h    |  29 +++-
>  arch/arm64/kernel/arm64ksyms.c      |   4 +-
>  arch/arm64/lib/copy_from_user.S     |   4 +-
>  arch/arm64/lib/copy_to_user.S       |   4 +-
>  arch/ia64/Kconfig                   |   1 +
>  arch/ia64/include/asm/uaccess.h     |  18 ++-
>  arch/powerpc/Kconfig                |   1 +
>  arch/powerpc/include/asm/uaccess.h  |  21 ++-
>  arch/s390/Kconfig                   |   1 +
>  arch/s390/lib/uaccess.c             |   2 +
>  arch/sparc/Kconfig                  |   1 +
>  arch/sparc/include/asm/uaccess_32.h |  14 +-
>  arch/sparc/include/asm/uaccess_64.h |  11 +-
>  arch/x86/Kconfig                    |   2 +
>  arch/x86/include/asm/thread_info.h  |  44 ++++++
>  arch/x86/include/asm/uaccess.h      |  10 +-
>  arch/x86/include/asm/uaccess_32.h   |   2 +
>  arch/x86/include/asm/uaccess_64.h   |   2 +
>  include/linux/mmzone.h              |   2 +
>  include/linux/slab.h                |  12 ++
>  include/linux/thread_info.h         |  24 ++++
>  init/Kconfig                        |   2 +
>  mm/Makefile                         |   4 +
>  mm/slab.c                           |  30 ++++
>  mm/slub.c                           |  40 ++++++
>  mm/usercopy.c                       | 268 ++++++++++++++++++++++++++++++++++++
>  security/Kconfig                    |  28 ++++
>  31 files changed, 573 insertions(+), 30 deletions(-)
>  create mode 100644 mm/usercopy.c
>
> --
> Kees Cook
> Brillo & Chrome OS Security



-- 
Kees Cook
Chrome OS & Brillo Security