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From: Andrey Konovalov <andreyknvl@google.com>
To: "Catalin Marinas" <catalin.marinas@arm.com>,
	"Will Deacon" <will.deacon@arm.com>,
	"Mark Rutland" <mark.rutland@arm.com>,
	"Robin Murphy" <robin.murphy@arm.com>,
	"Kees Cook" <keescook@chromium.org>,
	"Kate Stewart" <kstewart@linuxfoundation.org>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Ingo Molnar" <mingo@kernel.org>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
	"Shuah Khan" <shuah@kernel.org>,
	"Vincenzo Frascino" <vincenzo.frascino@arm.com>,
	"Eric Dumazet" <edumazet@google.com>,
	"David S. Miller" <davem@davemloft.net>,
	"Alexei Starovoitov" <ast@kernel.org>,
	"Daniel Borkmann" <daniel@iogearbox.net>,
	"Steven Rostedt" <rostedt@goodmis.org>,
	"Ingo Molnar" <mingo@redhat.com>,
	"Peter Zijlstra" <peterz@infradead.org>,
	"Arnaldo Carvalho de Melo" <acme@kernel.org>,
	"Alex Deucher" <alexander.deucher@amd.com>,
	"Christian König" <christian.koenig@amd.com>,
	"David (ChunMing) Zhou" <David1.Zhou@amd.com>,
	"Yishai Hadas" <yishaih@mellanox.com>,
	"Mauro Carvalho Chehab" <mchehab@kernel.org>,
	"Jens Wiklander" <jens.wiklander@linaro.org>,
	"Alex Williamson" <alex.williamson@redhat.com>,
	linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org,
	linux-arch@vger.kernel.org, netdev@vger.kernel.org,
	bpf@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, linux-kernel@vger.kernel.org
Cc: 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>,
	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 v13 06/20] mm, arm64: untag user pointers in get_vaddr_frames
Date: Wed, 20 Mar 2019 15:51:20 +0100	[thread overview]
Message-ID: <e1430838d7393896ade87ffbcf109c7127881137.1553093421.git.andreyknvl@google.com> (raw)
In-Reply-To: <cover.1553093420.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.

get_vaddr_frames uses provided user pointers for vma lookups, which can
only by done with untagged pointers. Instead of locating and changing
all callers of this function, perform untagging in it.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
 mm/frame_vector.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/frame_vector.c b/mm/frame_vector.c
index c64dca6e27c2..c431ca81dad5 100644
--- a/mm/frame_vector.c
+++ b/mm/frame_vector.c
@@ -46,6 +46,8 @@ int get_vaddr_frames(unsigned long start, unsigned int nr_frames,
 	if (WARN_ON_ONCE(nr_frames > vec->nr_allocated))
 		nr_frames = vec->nr_allocated;
 
+	start = untagged_addr(start);
+
 	down_read(&mm->mmap_sem);
 	locked = 1;
 	vma = find_vma_intersection(mm, start, start + 1);
-- 
2.21.0.225.g810b269d1ac-goog


  parent reply	other threads:[~2019-03-20 14:55 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-20 14:51 [PATCH v13 00/20] arm64: untag user pointers passed to the kernel Andrey Konovalov
2019-03-20 14:51 ` [PATCH v13 01/20] uaccess: add untagged_addr definition for other arches Andrey Konovalov
2019-03-20 14:51 ` [PATCH v13 02/20] arm64: untag user pointers in access_ok and __uaccess_mask_ptr Andrey Konovalov
2019-03-20 14:51 ` [PATCH v13 03/20] lib, arm64: untag user pointers in strn*_user Andrey Konovalov
2019-03-20 14:51 ` [PATCH v13 04/20] mm, arm64: untag user pointers passed to memory syscalls Andrey Konovalov
     [not found]   ` <20190322114357.GC13384@arrakis.emea.arm.com>
     [not found]     ` <CAAeHK+xE-ywfpVHRhBJVGiqOe0+BYW9awUa10ZP4P6Ggc8nxMg@mail.gmail.com>
     [not found]       ` <20190328141934.38960af0@gandalf.local.home>
2019-03-29 10:30         ` Catalin Marinas
2019-04-02 12:47           ` Andrey Konovalov
2019-04-11 16:40             ` Andrey Konovalov
2019-04-26 14:17             ` Catalin Marinas
2019-04-29 14:22               ` Andrey Konovalov
2019-03-20 14:51 ` [PATCH v13 05/20] mm, arm64: untag user pointers in mm/gup.c Andrey Konovalov
2019-03-20 14:51 ` Andrey Konovalov [this message]
2019-03-20 14:51 ` [PATCH v13 07/20] fs, arm64: untag user pointers in copy_mount_options Andrey Konovalov
2019-03-20 14:51 ` [PATCH v13 08/20] fs, arm64: untag user pointers in fs/userfaultfd.c Andrey Konovalov
2019-03-20 14:51 ` [PATCH v13 09/20] net, arm64: untag user pointers in tcp_zerocopy_receive Andrey Konovalov
2019-03-20 14:51 ` [PATCH v13 10/20] kernel, arm64: untag user pointers in prctl_set_mm* Andrey Konovalov
2019-03-21 17:52   ` Kevin Brodsky
2019-03-20 14:51 ` [PATCH v13 11/20] tracing, arm64: untag user pointers in seq_print_user_ip Andrey Konovalov
2019-03-20 14:51 ` [PATCH v13 12/20] uprobes, arm64: untag user pointers in find_active_uprobe Andrey Konovalov
2019-03-20 14:51 ` [PATCH v13 13/20] bpf, arm64: untag user pointers in stack_map_get_build_id_offset Andrey Konovalov
2019-03-20 14:51 ` [PATCH v13 14/20] drm/amdgpu, arm64: untag user pointers in amdgpu_ttm_tt_get_user_pages Andrey Konovalov
2019-03-20 14:51 ` [PATCH v13 15/20] drm/radeon, arm64: untag user pointers in radeon_ttm_tt_pin_userptr Andrey Konovalov
2019-03-20 14:51 ` [PATCH v13 16/20] IB/mlx4, arm64: untag user pointers in mlx4_get_umem_mr Andrey Konovalov
     [not found]   ` <20190429180915.GZ6705@mtr-leonro.mtl.com>
2019-04-30 11:16     ` Catalin Marinas
2019-04-30 12:03       ` Leon Romanovsky
2019-05-02 18:44       ` Jason Gunthorpe
2019-05-03 16:28         ` Catalin Marinas
2019-05-03 23:52           ` Jason Gunthorpe
2019-03-20 14:51 ` [PATCH v13 17/20] media/v4l2-core, arm64: untag user pointers in videobuf_dma_contig_user_get Andrey Konovalov
2019-03-20 14:51 ` [PATCH v13 18/20] tee/optee, arm64: untag user pointers in check_mem_type Andrey Konovalov
2019-03-20 14:51 ` [PATCH v13 19/20] vfio/type1, arm64: untag user pointers in vaddr_get_pfn Andrey Konovalov
2019-03-20 14:51 ` [PATCH v13 20/20] selftests, arm64: add a selftest for passing tagged pointers to kernel Andrey Konovalov

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