Message ID | 474b3c113edae1f2fa679dc7237ec070ff4efb70.1557160186.git.andreyknvl@google.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show
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[209.85.220.73]) by mx.google.com with SMTPS id s12sor461211vkf.53.2019.05.06.09.31.25 for <linux-mm@kvack.org> (Google Transport Security); Mon, 06 May 2019 09:31:25 -0700 (PDT) Received-SPF: pass (google.com: domain of 3xwhqxaokce4q3t7ue03b1w44w1u.s421y3ad-220bqs0.47w@flex--andreyknvl.bounces.google.com designates 209.85.220.73 as permitted sender) client-ip=209.85.220.73; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=MxkQGAhZ; spf=pass (google.com: domain of 3xwhqxaokce4q3t7ue03b1w44w1u.s421y3ad-220bqs0.47w@flex--andreyknvl.bounces.google.com designates 209.85.220.73 as permitted sender) smtp.mailfrom=3XWHQXAoKCE4q3t7uE03B1w44w1u.s421y3AD-220Bqs0.47w@flex--andreyknvl.bounces.google.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=ngD1QIqwofb3Y9K5MW1PYIryx3q7PiTEQfc6RhUnaA4=; b=MxkQGAhZKcdMVO3IoBudATPab8TcsjZXX55HRiAN6IeYJiwC1j+iSqld+LLo8qyTyU J83cHqvwCOHlnCBK8LZqFG9H1aqF9NgW/OCa1+Ffyx8ZPU7n9taYd+4siYtOtJGSGqfL 2bs1HGMZCs+84KfkjQ03uml4i8KyBdYF3wjbHGyt6HNd/mpMm+1Qp1No+KcUfeHVzCH2 4161opexQWrAtxUlTCrivmQSMNxZ99d5aHCBZ5OmsHW7nAo6evlOzv9F19PFlipvMxI4 C4R/T1FLs15dBoQSeJwhzGqmh+Swz0oYJVhSbKReuunpnwRMPL8ZC0ZS5QHAp3xWLkRd Hr1w== X-Google-Smtp-Source: APXvYqwpCSWnm5qxXyuaWGAqRu95+6gB9zDmbHbxq+0Vb45FEs/ziN6+T3PbyTnxcvdIphfk21MnSe6Qp4R1y+WG X-Received: by 2002:a1f:b45:: with SMTP id 66mr13881567vkl.38.1557160285529; Mon, 06 May 2019 09:31:25 -0700 (PDT) Date: Mon, 6 May 2019 18:30:52 +0200 In-Reply-To: <cover.1557160186.git.andreyknvl@google.com> Message-Id: <474b3c113edae1f2fa679dc7237ec070ff4efb70.1557160186.git.andreyknvl@google.com> Mime-Version: 1.0 References: <cover.1557160186.git.andreyknvl@google.com> X-Mailer: git-send-email 2.21.0.1020.gf2820cf01a-goog Subject: [PATCH v15 06/17] mm: untag user pointers in do_pages_move 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>, Felix Kuehling <Felix.Kuehling@amd.com>, Alexander Deucher <Alexander.Deucher@amd.com>, Christian Koenig <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>, 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> Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: <linux-mm.kvack.org> X-Virus-Scanned: ClamAV using ClamSMTP |
Series |
arm64: untag user pointers passed to the kernel
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On Mon, May 06, 2019 at 06:30:52PM +0200, Andrey Konovalov wrote: > 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. > > do_pages_move() is used in the implementation of the move_pages syscall. > > Untag user pointers in this function. > > Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
diff --git a/mm/migrate.c b/mm/migrate.c index 663a5449367a..c014a07135f0 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1617,6 +1617,7 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes, if (get_user(node, nodes + i)) goto out_flush; addr = (unsigned long)p; + addr = untagged_addr(addr); err = -ENODEV; if (node < 0 || node >= MAX_NUMNODES)
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. do_pages_move() is used in the implementation of the move_pages syscall. Untag user pointers in this function. Signed-off-by: Andrey Konovalov <andreyknvl@google.com> --- mm/migrate.c | 1 + 1 file changed, 1 insertion(+)