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[209.85.220.73]) by mx.google.com with SMTPS id g6sor716849ywa.26.2019.03.20.07.51.59 for (Google Transport Security); Wed, 20 Mar 2019 07:51:59 -0700 (PDT) Received-SPF: pass (google.com: domain of 3j1osxaokcgoivlzmgsvdtowwotm.kwutqvcf-uusdiks.wzo@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=aEInHw6B; spf=pass (google.com: domain of 3j1osxaokcgoivlzmgsvdtowwotm.kwutqvcf-uusdiks.wzo@flex--andreyknvl.bounces.google.com designates 209.85.220.73 as permitted sender) smtp.mailfrom=3j1OSXAoKCGoIVLZMgSVdTOWWOTM.KWUTQVcf-UUSdIKS.WZO@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=LfpjTjIWpAUqgBuBr+ROlRDq3TWjVWHbA3wqyLv7Gqg=; b=aEInHw6BmCYYrnLC9PZfamaP8mF0QEG6bCjPXX9eR1nz2FAxuz8AakcoBGofdWpDDO ecVj+WVvAcyIM/4jHbYKbWN9FEhIYhxx/aKOkZgY6J++xI42I0q0BxFc8HG1MgmsuX4p FgBukYgteSls5KRVIf9LdhyXrtbiuThjGHXpsr95ebbSY1J3++E89dF2htIPvvI1/DzR SYS+4UXKzfCBY88MgyuqrkPh/UK28DK8ANz0pzTScNriptvjxadnhKInYAl8KyI7hS2W ag76Sj+PtN/agIm/Cl1LRWjUtui4zCqqh5CFVGbEGTMZA2YuLM4VLbRUKwjvD9UBYhzt x9aQ== X-Google-Smtp-Source: APXvYqxWvfeu7/LSMKKYKhkYxK38R+2YVgnBYPzEJZ3bjv+W/V6SCf9AmAnMy/L0N0KnMLwcoOG80tlOQ6HUd2Ol X-Received: by 2002:a81:994d:: with SMTP id q74mr2209556ywg.18.1553093519515; Wed, 20 Mar 2019 07:51:59 -0700 (PDT) Date: Wed, 20 Mar 2019 15:51:19 +0100 In-Reply-To: Message-Id: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.21.0.225.g810b269d1ac-goog Subject: [PATCH v13 05/20] mm, arm64: untag user pointers in mm/gup.c From: Andrey Konovalov To: Catalin Marinas , Will Deacon , Mark Rutland , Robin Murphy , Kees Cook , Kate Stewart , Greg Kroah-Hartman , Andrew Morton , Ingo Molnar , "Kirill A . Shutemov" , Shuah Khan , Vincenzo Frascino , Eric Dumazet , "David S. Miller" , Alexei Starovoitov , Daniel Borkmann , Steven Rostedt , Ingo Molnar , Peter Zijlstra , Arnaldo Carvalho de Melo , Alex Deucher , "=?UTF-8?q?Christian=20K=C3=B6nig?=" , "David (ChunMing) Zhou" , Yishai Hadas , Mauro Carvalho Chehab , Jens Wiklander , Alex Williamson , 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 , Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Chintan Pandya , Luc Van Oostenryck , Dave Martin , Kevin Brodsky , Szabolcs Nagy , Andrey Konovalov 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: 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. mm/gup.c provides a kernel interface that accepts user addresses and manipulates user pages directly (for example get_user_pages, that is used by the futex syscall). Since a user can provided tagged addresses, we need to handle this case. Add untagging to gup.c functions that use user addresses for vma lookups. Signed-off-by: Andrey Konovalov --- mm/gup.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/mm/gup.c b/mm/gup.c index f84e22685aaa..3192741e0b3a 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -686,6 +686,8 @@ static long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, if (!nr_pages) return 0; + start = untagged_addr(start); + VM_BUG_ON(!!pages != !!(gup_flags & FOLL_GET)); /* @@ -848,6 +850,8 @@ int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm, struct vm_area_struct *vma; vm_fault_t ret, major = 0; + address = untagged_addr(address); + if (unlocked) fault_flags |= FAULT_FLAG_ALLOW_RETRY; -- 2.21.0.225.g810b269d1ac-goog