From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on archive.lwn.net X-Spam-Level: X-Spam-Status: No, score=-13.6 required=5.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.2 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by archive.lwn.net (Postfix) with ESMTP id 320FC7D91A for ; Fri, 15 Mar 2019 19:52:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727528AbfCOTwV (ORCPT ); Fri, 15 Mar 2019 15:52:21 -0400 Received: from mail-qt1-f201.google.com ([209.85.160.201]:55359 "EHLO mail-qt1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727506AbfCOTwT (ORCPT ); Fri, 15 Mar 2019 15:52:19 -0400 Received: by mail-qt1-f201.google.com with SMTP id h51so1938839qte.22 for ; Fri, 15 Mar 2019 12:52:19 -0700 (PDT) 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=REP9LhKq3azFcE3epBwHjl0z4e4u8qSodB2K6JOUUqY=; b=FNIVGISAdAEFbreSsDDijAXV7iz7bJ+nqAbnQIHGv5JyzeZ7lcBCJx59d3veVulKlh 7jE3udTRD8ZB4FsTnM9RGbtkCH/mbxzWvFL0H4sXjQx4qi2m5t5ro7oy5rhM45nSVVBP 5ClTpMIvyiu2q1I0rCYKPmV2nRUW01xZpnfJIxUQMHQ44ykxwcrzRx307eckpZorbuN3 6VEq4E+w7Q2yQVpjsHzE5SdEEFgZlQL/gXacFSIer7uFwLUhfH2E6+fmsaTjr28zvsU3 LxduxWE/YJsel6dur8r7Ne5zecAEIXKRCQ6ztsVh51aCO/ECwJBztr37RmWaHcFGyfRo FPEA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=REP9LhKq3azFcE3epBwHjl0z4e4u8qSodB2K6JOUUqY=; b=XiKeUnnVzpFRi2Hta7jy2VBtrt5RV9aW2qe7JkJO7RW1Q1qPs2FUiUiWay+u1p8QJZ pxzXrTTgd1DzyFfMBCwEnatE/nbPNPeXuCQ18KnEC79cWgJ6Ec0cWuiLqjLZKO1PMOOA iMyJyZG38zZXbo2Ya2XGM1O7upjwZSlhLcEAs6VrOnPjOzrDnQXkSLiC8mRGBZEEVQfq 78WRGyAuYRJclUVS3guEJ+HidZnyhfZb4brL4psWzid0pWDOqUDsm87p0YbjnHnygaOT XMvqd/sqGoy9x6bGUZ+Z21Qt8HJEEnJpM5nIpS68AwxUbBeLn8MHWY+UFhf34Vlgex+c je5w== X-Gm-Message-State: APjAAAVxUl4rPnS40I4U7J/aE80SmsRT1Ndf5ATdI33hobGuVWaylu6K 6Po37R1Kz02ImoFoeNywmIW5mpsPBd8ZwVLp X-Google-Smtp-Source: APXvYqwJcWbE90DsufpIchU1RWZDjZYiH/OdYEaqepbyMZK8dYdaYAIDqIiN21SA2dhnlvcWp5RKO708a/U1e0LV X-Received: by 2002:ac8:2d7c:: with SMTP id o57mr3149114qta.39.1552679538830; Fri, 15 Mar 2019 12:52:18 -0700 (PDT) Date: Fri, 15 Mar 2019 20:51:35 +0100 In-Reply-To: Message-Id: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.21.0.360.g471c308f928-goog Subject: [PATCH v11 11/14] uprobes, arm64: untag user pointers in find_active_uprobe 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 , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, netdev@vger.kernel.org, bpf@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" Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org 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. find_active_uprobe() uses provided user pointer (obtained via instruction_pointer(regs)) for vma lookups, which can only by done with untagged pointers. Untag the user pointer in this function. Signed-off-by: Andrey Konovalov --- kernel/events/uprobes.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index c5cde87329c7..d3a2716a813a 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -1992,6 +1992,8 @@ static struct uprobe *find_active_uprobe(unsigned long bp_vaddr, int *is_swbp) struct uprobe *uprobe = NULL; struct vm_area_struct *vma; + bp_vaddr = untagged_addr(bp_vaddr); + down_read(&mm->mmap_sem); vma = find_vma(mm, bp_vaddr); if (vma && vma->vm_start <= bp_vaddr) { -- 2.21.0.360.g471c308f928-goog