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: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, Andrey Konovalov <andreyknvl@google.com>, Alexander Viro <viro@zeniv.linux.org.uk> Subject: [PATCH v4 0/2] arm64 relaxed ABI Date: Wed, 12 Jun 2019 15:21:09 +0100 [thread overview] Message-ID: <20190612142111.28161-1-vincenzo.frascino@arm.com> (raw) In-Reply-To: <cover.1560339705.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: Alexander Viro <viro@zeniv.linux.org.uk> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Vincenzo Frascino (2): arm64: Define Documentation/arm64/tagged-address-abi.txt arm64: Relax Documentation/arm64/tagged-pointers.txt Documentation/arm64/tagged-address-abi.txt | 111 +++++++++++++++++++++ Documentation/arm64/tagged-pointers.txt | 23 +++-- 2 files changed, 127 insertions(+), 7 deletions(-) create mode 100644 Documentation/arm64/tagged-address-abi.txt -- 2.21.0
WARNING: multiple messages have this Message-ID (diff)
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: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, Alexander Viro <viro@zeniv.linux.org.uk>, Andrey Konovalov <andreyknvl@google.com> Subject: [PATCH v4 0/2] arm64 relaxed ABI Date: Wed, 12 Jun 2019 15:21:09 +0100 [thread overview] Message-ID: <20190612142111.28161-1-vincenzo.frascino@arm.com> (raw) In-Reply-To: <cover.1560339705.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: Alexander Viro <viro@zeniv.linux.org.uk> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Vincenzo Frascino (2): arm64: Define Documentation/arm64/tagged-address-abi.txt arm64: Relax Documentation/arm64/tagged-pointers.txt Documentation/arm64/tagged-address-abi.txt | 111 +++++++++++++++++++++ Documentation/arm64/tagged-pointers.txt | 23 +++-- 2 files changed, 127 insertions(+), 7 deletions(-) create mode 100644 Documentation/arm64/tagged-address-abi.txt -- 2.21.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-06-12 14:21 UTC|newest] Thread overview: 253+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-06-12 11:43 [PATCH v17 00/15] arm64: untag user pointers passed to the kernel Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` [PATCH v17 01/15] arm64: untag user pointers in access_ok and __uaccess_mask_ptr Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 14:26 ` Vincenzo Frascino 2019-06-12 14:26 ` Vincenzo Frascino 2019-06-12 14:26 ` Vincenzo Frascino 2019-06-12 11:43 ` [PATCH v17 02/15] lib, arm64: untag user pointers in strn*_user Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 14:28 ` Vincenzo Frascino 2019-06-12 14:28 ` Vincenzo Frascino 2019-06-12 14:28 ` Vincenzo Frascino 2019-06-12 11:43 ` [PATCH v17 03/15] arm64: Introduce prctl() options to control the tagged user addresses ABI Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 14:30 ` Vincenzo Frascino 2019-06-12 14:30 ` Vincenzo Frascino 2019-06-12 14:30 ` Vincenzo Frascino 2019-06-12 14:55 ` Catalin Marinas 2019-06-12 14:55 ` Catalin Marinas 2019-06-12 14:55 ` Catalin Marinas 2019-06-13 11:02 ` Dave Martin 2019-06-13 11:02 ` Dave Martin 2019-06-13 11:02 ` Dave Martin 2019-06-13 15:26 ` Catalin Marinas 2019-06-13 15:26 ` Catalin Marinas 2019-06-13 15:26 ` Catalin Marinas 2019-06-14 5:13 ` Kees Cook 2019-06-14 5:13 ` Kees Cook 2019-06-14 5:13 ` Kees Cook 2019-06-18 9:18 ` Dave Martin 2019-06-18 9:18 ` Dave Martin 2019-06-18 9:18 ` Dave Martin 2019-06-13 11:16 ` Dave Martin 2019-06-13 11:16 ` Dave Martin 2019-06-13 11:16 ` Dave Martin 2019-06-13 15:35 ` Catalin Marinas 2019-06-13 15:35 ` Catalin Marinas 2019-06-13 15:35 ` Catalin Marinas 2019-06-13 15:45 ` Vincenzo Frascino 2019-06-13 15:45 ` Vincenzo Frascino 2019-06-13 15:45 ` Vincenzo Frascino 2019-06-13 15:57 ` Catalin Marinas 2019-06-13 15:57 ` Catalin Marinas 2019-06-13 15:57 ` Catalin Marinas 2019-06-13 16:15 ` Vincenzo Frascino 2019-06-13 16:15 ` Vincenzo Frascino 2019-06-13 16:15 ` Vincenzo Frascino 2019-06-17 13:56 ` Catalin Marinas 2019-06-17 13:56 ` Catalin Marinas 2019-06-17 13:56 ` Catalin Marinas 2019-06-17 16:56 ` Szabolcs Nagy 2019-06-17 16:56 ` Szabolcs Nagy 2019-06-17 16:56 ` Szabolcs Nagy 2019-06-17 16:56 ` Szabolcs Nagy 2019-06-17 16:57 ` Evgenii Stepanov 2019-06-17 16:57 ` Evgenii Stepanov 2019-06-17 16:57 ` Evgenii Stepanov 2019-06-17 16:57 ` Evgenii Stepanov 2019-06-17 17:18 ` Catalin Marinas 2019-06-17 17:18 ` Catalin Marinas 2019-06-17 17:18 ` Catalin Marinas 2019-06-17 17:18 ` Catalin Marinas 2019-06-17 21:59 ` Evgenii Stepanov 2019-06-17 21:59 ` Evgenii Stepanov 2019-06-17 21:59 ` Evgenii Stepanov 2019-06-17 21:59 ` Evgenii Stepanov 2019-06-19 14:45 ` Andrey Konovalov 2019-06-19 14:45 ` Andrey Konovalov 2019-06-19 14:45 ` Andrey Konovalov 2019-06-19 14:45 ` Andrey Konovalov 2019-06-19 15:29 ` Catalin Marinas 2019-06-19 15:29 ` Catalin Marinas 2019-06-19 15:29 ` Catalin Marinas 2019-06-19 15:29 ` Catalin Marinas 2019-06-12 11:43 ` [PATCH v17 04/15] mm, arm64: untag user pointers passed to memory syscalls Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 14:31 ` Vincenzo Frascino 2019-06-12 14:31 ` Vincenzo Frascino 2019-06-12 14:31 ` Vincenzo Frascino 2019-06-19 15:55 ` Khalid Aziz 2019-06-19 15:55 ` Khalid Aziz 2019-06-19 15:55 ` Khalid Aziz 2019-06-19 16:46 ` Khalid Aziz 2019-06-19 16:46 ` Khalid Aziz 2019-06-19 16:46 ` Khalid Aziz 2019-06-24 14:22 ` Andrey Konovalov 2019-06-24 14:22 ` Andrey Konovalov 2019-06-24 14:22 ` Andrey Konovalov 2019-06-24 14:22 ` Andrey Konovalov 2019-06-12 11:43 ` [PATCH v17 05/15] mm, arm64: untag user pointers in mm/gup.c Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 14:33 ` Vincenzo Frascino 2019-06-12 14:33 ` Vincenzo Frascino 2019-06-12 14:33 ` Vincenzo Frascino 2019-06-19 16:41 ` Khalid Aziz 2019-06-19 16:41 ` Khalid Aziz 2019-06-19 16:41 ` Khalid Aziz 2019-06-12 11:43 ` [PATCH v17 06/15] mm, arm64: untag user pointers in get_vaddr_frames Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 14:34 ` Vincenzo Frascino 2019-06-12 14:34 ` Vincenzo Frascino 2019-06-12 14:34 ` Vincenzo Frascino 2019-06-19 16:48 ` Khalid Aziz 2019-06-19 16:48 ` Khalid Aziz 2019-06-19 16:48 ` Khalid Aziz 2019-06-12 11:43 ` [PATCH v17 07/15] fs, arm64: untag user pointers in copy_mount_options Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 14:35 ` Vincenzo Frascino 2019-06-12 14:35 ` Vincenzo Frascino 2019-06-12 14:35 ` Vincenzo Frascino 2019-06-19 20:01 ` Khalid Aziz 2019-06-19 20:01 ` Khalid Aziz 2019-06-19 20:01 ` Khalid Aziz 2019-06-12 11:43 ` [PATCH v17 08/15] userfaultfd, arm64: untag user pointers Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 14:40 ` Vincenzo Frascino 2019-06-12 14:40 ` Vincenzo Frascino 2019-06-12 14:40 ` Vincenzo Frascino 2019-06-12 11:43 ` [PATCH v17 09/15] drm/amdgpu, " Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` [PATCH v17 10/15] drm/radeon, arm64: untag user pointers in radeon_gem_userptr_ioctl Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` [PATCH v17 11/15] IB/mlx4, arm64: untag user pointers in mlx4_get_umem_mr Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` [PATCH v17 12/15] media/v4l2-core, arm64: untag user pointers in videobuf_dma_contig_user_get Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-19 20:05 ` Khalid Aziz 2019-06-19 20:05 ` Khalid Aziz 2019-06-19 20:05 ` Khalid Aziz 2019-06-12 11:43 ` [PATCH v17 13/15] tee/shm, arm64: untag user pointers in tee_shm_register Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` [PATCH v17 14/15] vfio/type1, arm64: untag user pointers in vaddr_get_pfn Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 14:41 ` Vincenzo Frascino 2019-06-12 14:41 ` Vincenzo Frascino 2019-06-12 14:41 ` Vincenzo Frascino 2019-06-12 15:58 ` Auger Eric 2019-06-12 15:58 ` Auger Eric 2019-06-12 15:58 ` Auger Eric 2019-06-12 11:43 ` [PATCH v17 15/15] selftests, arm64: add a selftest for passing tagged pointers to kernel Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 11:43 ` Andrey Konovalov 2019-06-12 12:30 ` Szabolcs Nagy 2019-06-12 12:30 ` Szabolcs Nagy 2019-06-12 12:30 ` Szabolcs Nagy 2019-06-12 12:30 ` Szabolcs Nagy 2019-06-12 15:00 ` Catalin Marinas 2019-06-12 15:00 ` Catalin Marinas 2019-06-12 15:00 ` Catalin Marinas 2019-06-19 14:42 ` Andrey Konovalov 2019-06-19 14:42 ` Andrey Konovalov 2019-06-19 14:42 ` Andrey Konovalov 2019-06-12 14:21 ` Vincenzo Frascino [this message] 2019-06-12 14:21 ` [PATCH v4 0/2] arm64 relaxed ABI Vincenzo Frascino 2019-06-12 14:21 ` [PATCH v4 1/2] arm64: Define Documentation/arm64/tagged-address-abi.txt Vincenzo Frascino 2019-06-12 14:21 ` Vincenzo Frascino 2019-06-12 15:35 ` Catalin Marinas 2019-06-12 15:35 ` Catalin Marinas 2019-06-13 10:15 ` Vincenzo Frascino 2019-06-13 10:15 ` Vincenzo Frascino 2019-06-13 10:15 ` Vincenzo Frascino 2019-06-13 11:37 ` Dave Martin 2019-06-13 11:37 ` Dave Martin 2019-06-13 11:37 ` Dave Martin 2019-06-13 12:28 ` Catalin Marinas 2019-06-13 12:28 ` Catalin Marinas 2019-06-13 12:28 ` Catalin Marinas 2019-06-13 13:23 ` Dave Martin 2019-06-13 13:23 ` Dave Martin 2019-06-13 15:39 ` Catalin Marinas 2019-06-13 15:39 ` Catalin Marinas 2019-06-12 16:30 ` Szabolcs Nagy 2019-06-12 16:30 ` Szabolcs Nagy 2019-06-12 16:30 ` Szabolcs Nagy 2019-06-13 9:20 ` Catalin Marinas 2019-06-13 9:20 ` Catalin Marinas 2019-06-13 9:20 ` Catalin Marinas 2019-06-13 9:20 ` Catalin Marinas 2019-06-13 10:14 ` Szabolcs Nagy 2019-06-13 10:14 ` Szabolcs Nagy 2019-06-13 10:14 ` Szabolcs Nagy 2019-06-13 10:14 ` Szabolcs Nagy 2019-06-13 11:16 ` Vincenzo Frascino 2019-06-13 11:16 ` Vincenzo Frascino 2019-06-13 11:16 ` Vincenzo Frascino 2019-06-13 11:16 ` Vincenzo Frascino 2019-06-13 12:28 ` Szabolcs Nagy 2019-06-13 12:28 ` Szabolcs Nagy 2019-06-13 12:28 ` Szabolcs Nagy 2019-06-13 12:28 ` Szabolcs Nagy 2019-06-13 14:03 ` Vincenzo Frascino 2019-06-13 14:03 ` Vincenzo Frascino 2019-06-13 14:03 ` Vincenzo Frascino 2019-06-13 14:03 ` Vincenzo Frascino 2019-06-13 15:32 ` Szabolcs Nagy 2019-06-13 15:32 ` Szabolcs Nagy 2019-06-13 15:32 ` Szabolcs Nagy 2019-06-13 15:35 ` Vincenzo Frascino 2019-06-13 15:35 ` Vincenzo Frascino 2019-06-13 15:35 ` Vincenzo Frascino 2019-06-12 14:21 ` [PATCH v4 2/2] arm64: Relax Documentation/arm64/tagged-pointers.txt Vincenzo Frascino 2019-06-12 14:21 ` Vincenzo Frascino 2019-06-12 15:56 ` Catalin Marinas 2019-06-12 15:56 ` Catalin Marinas 2019-06-12 16:37 ` Szabolcs Nagy 2019-06-12 16:37 ` Szabolcs Nagy 2019-06-12 16:37 ` Szabolcs Nagy 2019-06-13 15:51 ` [PATCH v5 0/2] arm64 relaxed ABI Vincenzo Frascino 2019-06-13 15:51 ` Vincenzo Frascino 2019-06-13 15:51 ` Vincenzo Frascino 2019-06-13 15:51 ` [PATCH v5 1/2] arm64: Define Documentation/arm64/tagged-address-abi.txt Vincenzo Frascino 2019-06-13 15:51 ` Vincenzo Frascino 2019-06-18 11:02 ` Szabolcs Nagy 2019-06-18 11:02 ` Szabolcs Nagy 2019-06-18 11:02 ` Szabolcs Nagy 2019-06-18 13:13 ` Kevin Brodsky 2019-06-18 13:13 ` Kevin Brodsky 2019-06-21 15:16 ` Catalin Marinas 2019-06-21 15:16 ` Catalin Marinas 2019-06-21 15:16 ` Catalin Marinas 2019-06-13 15:51 ` [PATCH v5 2/2] arm64: Relax Documentation/arm64/tagged-pointers.txt Vincenzo Frascino 2019-06-13 15:51 ` Vincenzo Frascino
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