From: Laura Abbott <labbott@redhat.com>
To: Tycho Andersen <tycho@docker.com>, linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org, kernel-hardening@lists.openwall.com,
Marco Benatto <marco.antonio.780@gmail.com>,
Juerg Haefliger <juerg.haefliger@canonical.com>
Subject: Re: [kernel-hardening] [PATCH v5 00/10] Add support for eXclusive Page Frame Ownership
Date: Fri, 11 Aug 2017 16:35:52 -0700 [thread overview]
Message-ID: <9b3d80f0-7625-a0dc-cb00-cf0e940015b1@redhat.com> (raw)
In-Reply-To: <20170809200755.11234-1-tycho@docker.com>
On 08/09/2017 01:07 PM, Tycho Andersen wrote:
> Hi all,
>
> Here's a v5 of the XPFO set. Changes from v4 are:
>
> * huge pages support actually works now on x86
> * arm64 support, which boots on several different arm64 boards
> * tests for hugepages support as well via LKDTM (thanks Kees for suggesting how
> to make this work)
>
> Patch 2 contains some potentially controversial stuff, exposing the cpa_lock
> and lifting some other static functions out; there is probably a better way to
> do this, thoughts welcome.
>
> Still to do are:
>
> * get it to work with non-64k pages on ARM
> * get rid of the BUG()s, in favor or WARN or similar
> * other things people come up with in this review
>
> Please have a look. Thoughts welcome!
>
I gave this a quick test on my arm64 machine and I see faults once
we hit userspace:
[ 4.439714] Unhandled fault: TLB conflict abort (0x96000030) at 0xffff800391440090
[ 4.447357] Internal error: : 96000030 [#1] SMP
[ 4.451875] Modules linked in:
[ 4.454924] CPU: 2 PID: 184 Comm: systemd Tainted: G W 4.13.0-rc4-xpfo+ #63
[ 4.462989] Hardware name: AppliedMicro X-Gene Mustang Board/X-Gene Mustang Board, BIOS 3.06.12 Aug 12 2016
[ 4.472698] task: ffff8003e8d9fb00 task.stack: ffff8003f9fbc000
[ 4.478602] PC is at copy_page+0x48/0x110
[ 4.482601] LR is at __cpu_copy_user_page+0x28/0x48
I'll have to give this a closer look to see what's going on with the TLB flushing.
Thanks,
Laura
> Previously: http://www.openwall.com/lists/kernel-hardening/2017/06/07/24
>
> Tycho
>
> Juerg Haefliger (8):
> mm, x86: Add support for eXclusive Page Frame Ownership (XPFO)
> swiotlb: Map the buffer if it was unmapped by XPFO
> arm64: Add __flush_tlb_one()
> arm64/mm: Add support for XPFO
> arm64/mm: Disable section mappings if XPFO is enabled
> arm64/mm: Don't flush the data cache if the page is unmapped by XPFO
> arm64/mm: Add support for XPFO to swiotlb
> lkdtm: Add test for XPFO
>
> Tycho Andersen (2):
> mm: add MAP_HUGETLB support to vm_mmap
> mm: add a user_virt_to_phys symbol
>
> Documentation/admin-guide/kernel-parameters.txt | 2 +
> arch/arm64/Kconfig | 1 +
> arch/arm64/include/asm/cacheflush.h | 11 ++
> arch/arm64/include/asm/tlbflush.h | 8 +
> arch/arm64/mm/Makefile | 2 +
> arch/arm64/mm/dma-mapping.c | 32 ++--
> arch/arm64/mm/flush.c | 5 +-
> arch/arm64/mm/mmu.c | 14 +-
> arch/arm64/mm/xpfo.c | 160 +++++++++++++++++
> arch/x86/Kconfig | 1 +
> arch/x86/include/asm/pgtable.h | 23 +++
> arch/x86/mm/Makefile | 1 +
> arch/x86/mm/pageattr.c | 24 +--
> arch/x86/mm/xpfo.c | 153 +++++++++++++++++
> drivers/misc/Makefile | 1 +
> drivers/misc/lkdtm.h | 4 +
> drivers/misc/lkdtm_core.c | 4 +
> drivers/misc/lkdtm_xpfo.c | 62 +++++++
> include/linux/highmem.h | 15 +-
> include/linux/mm.h | 2 +
> include/linux/xpfo.h | 47 +++++
> lib/swiotlb.c | 3 +-
> mm/Makefile | 1 +
> mm/mmap.c | 19 +--
> mm/page_alloc.c | 2 +
> mm/page_ext.c | 4 +
> mm/util.c | 32 ++++
> mm/xpfo.c | 217 ++++++++++++++++++++++++
> security/Kconfig | 19 +++
> 29 files changed, 810 insertions(+), 59 deletions(-)
> create mode 100644 arch/arm64/mm/xpfo.c
> create mode 100644 arch/x86/mm/xpfo.c
> create mode 100644 drivers/misc/lkdtm_xpfo.c
> create mode 100644 include/linux/xpfo.h
> create mode 100644 mm/xpfo.c
>
prev parent reply other threads:[~2017-08-11 23:35 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-09 20:07 [PATCH v5 00/10] Add support for eXclusive Page Frame Ownership Tycho Andersen
2017-08-09 20:07 ` [PATCH v5 01/10] mm: add MAP_HUGETLB support to vm_mmap Tycho Andersen
2017-08-09 20:07 ` [PATCH v5 02/10] mm, x86: Add support for eXclusive Page Frame Ownership (XPFO) Tycho Andersen
2017-08-14 18:51 ` Laura Abbott
2017-08-14 22:30 ` Laura Abbott
2017-08-15 3:47 ` Tycho Andersen
2017-08-15 3:51 ` Tycho Andersen
2017-08-09 20:07 ` [PATCH v5 03/10] swiotlb: Map the buffer if it was unmapped by XPFO Tycho Andersen
2017-08-10 13:01 ` Konrad Rzeszutek Wilk
2017-08-10 16:22 ` Tycho Andersen
2017-09-20 16:19 ` Dave Hansen
2017-09-20 22:47 ` Tycho Andersen
2017-09-20 23:25 ` Dave Hansen
2017-08-09 20:07 ` [PATCH v5 04/10] arm64: Add __flush_tlb_one() Tycho Andersen
2017-08-12 11:26 ` [kernel-hardening] " Mark Rutland
2017-08-14 16:35 ` Tycho Andersen
2017-08-14 16:50 ` Mark Rutland
2017-08-14 17:01 ` Tycho Andersen
2017-08-23 16:58 ` Tycho Andersen
2017-08-23 17:04 ` Mark Rutland
2017-08-23 17:13 ` Tycho Andersen
2017-08-24 15:45 ` Mark Rutland
2017-08-29 17:24 ` Tycho Andersen
2017-08-30 5:31 ` Juerg Haefliger
2017-08-30 16:47 ` Tycho Andersen
2017-08-31 9:43 ` Juerg Haefliger
2017-08-31 9:47 ` Mark Rutland
2017-08-31 21:21 ` Tycho Andersen
2017-08-09 20:07 ` [PATCH v5 05/10] arm64/mm: Add support for XPFO Tycho Andersen
2017-08-11 18:01 ` [kernel-hardening] " Laura Abbott
2017-08-11 20:19 ` Tycho Andersen
2017-08-09 20:07 ` [PATCH v5 06/10] arm64/mm: Disable section mappings if XPFO is enabled Tycho Andersen
2017-08-11 17:25 ` [kernel-hardening] " Laura Abbott
2017-08-11 21:13 ` Tycho Andersen
2017-08-11 21:52 ` Tycho Andersen
2017-08-12 11:17 ` Mark Rutland
2017-08-14 16:22 ` Tycho Andersen
2017-08-14 18:42 ` Laura Abbott
2017-08-14 20:28 ` Tycho Andersen
2017-08-09 20:07 ` [PATCH v5 07/10] arm64/mm: Don't flush the data cache if the page is unmapped by XPFO Tycho Andersen
2017-08-12 11:57 ` [kernel-hardening] " Mark Rutland
2017-08-14 16:54 ` Mark Rutland
2017-08-14 20:27 ` Tycho Andersen
2017-08-15 9:39 ` Mark Rutland
2017-08-09 20:07 ` [PATCH v5 08/10] arm64/mm: Add support for XPFO to swiotlb Tycho Andersen
2017-08-10 13:11 ` Konrad Rzeszutek Wilk
2017-08-10 16:35 ` Tycho Andersen
2017-08-09 20:07 ` [PATCH v5 09/10] mm: add a user_virt_to_phys symbol Tycho Andersen
2017-08-09 20:07 ` [PATCH v5 10/10] lkdtm: Add test for XPFO Tycho Andersen
2017-08-12 20:24 ` kbuild test robot
2017-08-14 16:21 ` Tycho Andersen
2017-08-12 21:05 ` kbuild test robot
2017-08-14 19:10 ` Kees Cook
2017-08-14 20:29 ` Tycho Andersen
2017-08-11 23:35 ` Laura Abbott [this message]
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