From: Andrey Konovalov <andreyknvl@google.com>
To: linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org,
dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org,
linux-media@vger.kernel.org, kvm@vger.kernel.org,
linux-kselftest@vger.kernel.org
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Will Deacon <will.deacon@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Kees Cook <keescook@chromium.org>,
Yishai Hadas <yishaih@mellanox.com>,
Kuehling@google.com, Felix <Felix.Kuehling@amd.com>,
Deucher@google.com, Alexander <Alexander.Deucher@amd.com>,
Koenig@google.com, Christian <Christian.Koenig@amd.com>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Jens Wiklander <jens.wiklander@linaro.org>,
Alex Williamson <alex.williamson@redhat.com>,
Leon Romanovsky <leon@kernel.org>,
Dmitry Vyukov <dvyukov@google.com>,
Kostya Serebryany <kcc@google.com>,
Evgeniy Stepanov <eugenis@google.com>,
Lee Smith <Lee.Smith@arm.com>,
Ramana Radhakrishnan <Ramana.Radhakrishnan@arm.com>,
Jacob Bramley <Jacob.Bramley@arm.com>,
Ruben Ayrapetyan <Ruben.Ayrapetyan@arm.com>,
Robin Murphy <robin.murphy@arm.com>,
Chintan Pandya <cpandya@codeaurora.org>,
Luc Van Oostenryck <luc.vanoostenryck@gmail.com>,
Dave Martin <Dave.Martin@arm.com>,
Kevin Brodsky <kevin.brodsky@arm.com>,
Szabolcs Nagy <Szabolcs.Nagy@arm.com>,
Andrey Konovalov <andreyknvl@google.com>
Subject: [PATCH v14 10/17] fs, arm64: untag user pointers in fs/userfaultfd.c
Date: Tue, 30 Apr 2019 15:25:06 +0200 [thread overview]
Message-ID: <7d3b28689d47c0fa1b80628f248dbf78548da25f.1556630205.git.andreyknvl@google.com> (raw)
In-Reply-To: <cover.1556630205.git.andreyknvl@google.com>
This patch is a part of a series that extends arm64 kernel ABI to allow to
pass tagged user pointers (with the top byte set to something else other
than 0x00) as syscall arguments.
userfaultfd_register() and userfaultfd_unregister() use provided user
pointers for vma lookups, which can only by done with untagged pointers.
Untag user pointers in these functions.
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
fs/userfaultfd.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index f5de1e726356..fdee0db0e847 100644
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -1325,6 +1325,9 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx,
goto out;
}
+ uffdio_register.range.start =
+ untagged_addr(uffdio_register.range.start);
+
ret = validate_range(mm, uffdio_register.range.start,
uffdio_register.range.len);
if (ret)
@@ -1514,6 +1517,8 @@ static int userfaultfd_unregister(struct userfaultfd_ctx *ctx,
if (copy_from_user(&uffdio_unregister, buf, sizeof(uffdio_unregister)))
goto out;
+ uffdio_unregister.start = untagged_addr(uffdio_unregister.start);
+
ret = validate_range(mm, uffdio_unregister.start,
uffdio_unregister.len);
if (ret)
--
2.21.0.593.g511ec345e18-goog
next prev parent reply other threads:[~2019-04-30 13:25 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-30 13:24 [PATCH v14 00/17] arm64: untag user pointers passed to the kernel Andrey Konovalov
2019-04-30 13:24 ` [PATCH v14 01/17] uaccess: add untagged_addr definition for other arches Andrey Konovalov
2019-04-30 13:24 ` [PATCH v14 02/17] arm64: untag user pointers in access_ok and __uaccess_mask_ptr Andrey Konovalov
2019-04-30 13:24 ` [PATCH v14 03/17] lib, arm64: untag user pointers in strn*_user Andrey Konovalov
2019-04-30 13:25 ` [PATCH v14 04/17] mm: add ksys_ wrappers to memory syscalls Andrey Konovalov
2019-04-30 13:25 ` [PATCH v14 05/17] arms64: untag user pointers passed " Andrey Konovalov
2019-04-30 13:25 ` [PATCH v14 06/17] mm: untag user pointers in do_pages_move Andrey Konovalov
2019-04-30 13:25 ` [PATCH v14 07/17] mm, arm64: untag user pointers in mm/gup.c Andrey Konovalov
2019-04-30 13:25 ` [PATCH v14 08/17] mm, arm64: untag user pointers in get_vaddr_frames Andrey Konovalov
2019-05-03 16:51 ` Catalin Marinas
2019-05-06 13:53 ` Andrey Konovalov
2019-04-30 13:25 ` [PATCH v14 09/17] fs, arm64: untag user pointers in copy_mount_options Andrey Konovalov
2019-04-30 13:25 ` Andrey Konovalov [this message]
2019-05-03 16:56 ` [PATCH v14 10/17] fs, arm64: untag user pointers in fs/userfaultfd.c Catalin Marinas
2019-05-06 14:15 ` Andrey Konovalov
2019-04-30 13:25 ` [PATCH v14 11/17] drm/amdgpu, arm64: untag user pointers Andrey Konovalov
2019-04-30 18:03 ` Kuehling, Felix
2019-05-06 13:50 ` Andrey Konovalov
2019-04-30 13:25 ` [PATCH v14 12/17] drm/radeon, " Andrey Konovalov
2019-04-30 17:57 ` Kuehling, Felix
2019-05-06 13:44 ` Andrey Konovalov
2019-04-30 13:25 ` [PATCH v14 13/17] IB/mlx4, arm64: untag user pointers in mlx4_get_umem_mr Andrey Konovalov
2019-05-03 17:03 ` Catalin Marinas
2019-05-06 16:21 ` Andrey Konovalov
2019-04-30 13:25 ` [PATCH v14 14/17] media/v4l2-core, arm64: untag user pointers in videobuf_dma_contig_user_get Andrey Konovalov
2019-04-30 13:25 ` [PATCH v14 15/17] tee, arm64: untag user pointers in tee_shm_register Andrey Konovalov
2019-04-30 13:25 ` [PATCH v14 16/17] vfio/type1, arm64: untag user pointers in vaddr_get_pfn Andrey Konovalov
2019-04-30 13:25 ` [PATCH v14 17/17] selftests, arm64: add a selftest for passing tagged pointers to kernel Andrey Konovalov
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