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Date: Mon, 6 May 2019 18:30:54 +0200 From: Andrey Konovalov <andreyknvl@...gle.com> To: linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org, amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, linux-rdma@...r.kernel.org, linux-media@...r.kernel.org, kvm@...r.kernel.org, linux-kselftest@...r.kernel.org Cc: Catalin Marinas <catalin.marinas@....com>, Vincenzo Frascino <vincenzo.frascino@....com>, Will Deacon <will.deacon@....com>, Mark Rutland <mark.rutland@....com>, Andrew Morton <akpm@...ux-foundation.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Kees Cook <keescook@...omium.org>, Yishai Hadas <yishaih@...lanox.com>, Felix Kuehling <Felix.Kuehling@....com>, Alexander Deucher <Alexander.Deucher@....com>, Christian Koenig <Christian.Koenig@....com>, Mauro Carvalho Chehab <mchehab@...nel.org>, Jens Wiklander <jens.wiklander@...aro.org>, Alex Williamson <alex.williamson@...hat.com>, Leon Romanovsky <leon@...nel.org>, Dmitry Vyukov <dvyukov@...gle.com>, Kostya Serebryany <kcc@...gle.com>, Evgeniy Stepanov <eugenis@...gle.com>, Lee Smith <Lee.Smith@....com>, Ramana Radhakrishnan <Ramana.Radhakrishnan@....com>, Jacob Bramley <Jacob.Bramley@....com>, Ruben Ayrapetyan <Ruben.Ayrapetyan@....com>, Robin Murphy <robin.murphy@....com>, Luc Van Oostenryck <luc.vanoostenryck@...il.com>, Dave Martin <Dave.Martin@....com>, Kevin Brodsky <kevin.brodsky@....com>, Szabolcs Nagy <Szabolcs.Nagy@....com>, Andrey Konovalov <andreyknvl@...gle.com> Subject: [PATCH v15 08/17] mm, arm64: untag user pointers in get_vaddr_frames 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@...gle.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); -- 2.21.0.1020.gf2820cf01a-goog
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