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From: Vincenzo Frascino <vincenzo.frascino@arm.com>
To: linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org,
	linux-mm@kvack.org, linux-arch@vger.kernel.org,
	linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Szabolcs Nagy <szabolcs.nagy@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	vincenzo.frascino@arm.com, Will Deacon <will.deacon@arm.com>,
	Andrey Konovalov <andreyknvl@google.com>
Subject: [PATCH v6 0/2] arm64 relaxed ABI
Date: Thu, 25 Jul 2019 14:50:42 +0100	[thread overview]
Message-ID: <20190725135044.24381-1-vincenzo.frascino@arm.com> (raw)
In-Reply-To: <cover.1563904656.git.andreyknvl@google.com>

On arm64 the TCR_EL1.TBI0 bit has been always enabled on the arm64 kernel,
hence the userspace (EL0) is allowed to set a non-zero value in the top
byte but the resulting pointers are not allowed at the user-kernel syscall
ABI boundary.

This patchset proposes a relaxation of the ABI with which it is possible
to pass tagged tagged pointers to the syscalls, when these pointers are in
memory ranges obtained as described in tagged-address-abi.txt contained in
this patch series.

Since it is not desirable to relax the ABI to allow tagged user addresses
into the kernel indiscriminately, this patchset documents a new sysctl
interface (/proc/sys/abi/tagged_addr) that is used to prevent the applications
from enabling the relaxed ABI and a new prctl() interface that can be used to
enable or disable the relaxed ABI.

This patchset should be merged together with [1].

[1] https://patchwork.kernel.org/cover/10674351/

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
CC: Andrey Konovalov <andreyknvl@google.com>
Cc: Szabolcs Nagy <szabolcs.nagy@arm.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>

Vincenzo Frascino (2):
  arm64: Define Documentation/arm64/tagged-address-abi.rst
  arm64: Relax Documentation/arm64/tagged-pointers.rst

 Documentation/arm64/tagged-address-abi.rst | 148 +++++++++++++++++++++
 Documentation/arm64/tagged-pointers.rst    |  23 +++-
 2 files changed, 164 insertions(+), 7 deletions(-)
 create mode 100644 Documentation/arm64/tagged-address-abi.rst

-- 
2.22.0


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  parent reply	other threads:[~2019-07-25 13:51 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-23 17:58 [PATCH v19 00/15] arm64: untag user pointers passed to the kernel Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 01/15] arm64: untag user pointers in access_ok and __uaccess_mask_ptr Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 02/15] arm64: Introduce prctl() options to control the tagged user addresses ABI Andrey Konovalov
2019-07-31 17:05   ` Dave Hansen
2019-08-01 12:38     ` Kevin Brodsky
2019-08-01 16:45       ` Dave Hansen
2019-08-02 10:50         ` Catalin Marinas
2019-08-09 16:08   ` Catalin Marinas
2019-07-23 17:58 ` [PATCH v19 03/15] lib: untag user pointers in strn*_user Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 04/15] mm: untag user pointers passed to memory syscalls Andrey Konovalov
2019-08-09 16:03   ` Catalin Marinas
2019-07-23 17:58 ` [PATCH v19 05/15] mm: untag user pointers in mm/gup.c Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 06/15] mm: untag user pointers in get_vaddr_frames Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 07/15] fs/namespace: untag user pointers in copy_mount_options Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 08/15] userfaultfd: untag user pointers Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 09/15] drm/amdgpu: " Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 10/15] drm/radeon: untag user pointers in radeon_gem_userptr_ioctl Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 11/15] IB/mlx4: untag user pointers in mlx4_get_umem_mr Andrey Konovalov
2019-07-24 19:25   ` Jason Gunthorpe
2019-07-25 11:17     ` Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 12/15] media/v4l2-core: untag user pointers in videobuf_dma_contig_user_get Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 13/15] tee/shm: untag user pointers in tee_shm_register Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 14/15] vfio/type1: untag user pointers in vaddr_get_pfn Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 15/15] selftests, arm64: add a selftest for passing tagged pointers to kernel Andrey Konovalov
2019-07-23 18:03 ` [PATCH v19 00/15] arm64: untag user pointers passed to the kernel Andrey Konovalov
2019-07-24 14:02   ` Will Deacon
2019-07-24 14:16     ` Andrey Konovalov
2019-07-24 14:20       ` Will Deacon
2019-07-24 17:12         ` Vincenzo Frascino
2019-08-06 17:13         ` Will Deacon
2019-08-07 17:17           ` Andrey Konovalov
2019-08-08 21:12             ` Kees Cook
2019-08-08 22:33               ` Andrew Morton
2019-08-08 23:09                 ` Kees Cook
2019-08-09  9:00                   ` Catalin Marinas
2019-08-09  9:28                     ` Dave Martin
2019-07-25 13:50 ` Vincenzo Frascino [this message]
2019-07-25 13:50   ` [PATCH v6 1/2] arm64: Define Documentation/arm64/tagged-address-abi.rst Vincenzo Frascino
2019-07-30 10:32     ` Kevin Brodsky
2019-07-30 13:25       ` Vincenzo Frascino
2019-07-30 13:57         ` Kevin Brodsky
2019-07-30 14:24           ` Vincenzo Frascino
2019-07-30 14:48             ` Kevin Brodsky
2019-07-31 16:43     ` Dave Hansen
2019-08-02 10:08       ` Catalin Marinas
2019-07-25 13:50   ` [PATCH v6 2/2] arm64: Relax Documentation/arm64/tagged-pointers.rst Vincenzo Frascino
2019-07-31 16:50 ` [PATCH v19 00/15] arm64: untag user pointers passed to the kernel Dave Hansen
2019-08-01 12:11   ` Kevin Brodsky
2019-08-01 12:48     ` Andrey Konovalov
2019-08-01 15:36       ` Dave Hansen
2019-08-02 10:20         ` Catalin Marinas

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