From patchwork Wed Mar 20 14:51:25 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Konovalov X-Patchwork-Id: 10862013 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 99E5F14DE for ; Wed, 20 Mar 2019 14:54:20 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 869CF2981F for ; Wed, 20 Mar 2019 14:54:20 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 79ADD299FD; Wed, 20 Mar 2019 14:54:20 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.5 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI, USER_IN_DEF_DKIM_WL autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1D41228D89 for ; Wed, 20 Mar 2019 14:54:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728504AbfCTOyT (ORCPT ); Wed, 20 Mar 2019 10:54:19 -0400 Received: from mail-qk1-f202.google.com ([209.85.222.202]:56929 "EHLO mail-qk1-f202.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728521AbfCTOwV (ORCPT ); Wed, 20 Mar 2019 10:52:21 -0400 Received: by mail-qk1-f202.google.com with SMTP id s87so16990432qks.23 for ; Wed, 20 Mar 2019 07:52:20 -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=K4asd4oI0/VXu7bks/7ZozR0oEqYxUgnLBJb7yiErTQ=; b=Sefw+LBQD0bYtQOF7Z3/FF5rWl5fnzlahJItvb5ZICgi8f6u4tK/9F6nfzFXPich3o EcUn7JVF7lEJYJneqAC0m7D0m73A5VmH620Qfp8NMW21rRutLGEd2Gtg1ILCNwDmdZNZ FjIyPxXe0aqGhTuqozDv4invVSFneb5ZIlySFOfmNfdoGDZG5iv4aiillZPkIZFAoy/1 Op94lqwLg26NfLmDs8/kDtPAlvGhye76V+rDgwQLh/XO9bfB2FGQp9lBXpf3J2QGTDlH XxqI4JERIWdF2z3HZogNyJS65SJ4WuJX9kuolmSrlZO9gRMOVvxcsIln5olphRwer6Xd nAYQ== 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=K4asd4oI0/VXu7bks/7ZozR0oEqYxUgnLBJb7yiErTQ=; b=kIjPL8K6vbshqchbpo/ymcjBVRelUHskNoWy3DvCGmZdZsHzOkYvTF1GwMxNi8Wj8R rQ8soOFdEYhrc1Uh88h5I/yPva9kP50cNSNwgL89F07bPaNgDk+iyR8TdVs+xdIMnmeK c5oz9fCIxohFLO07i4mzjqBx81YQhR1zgCsLwR3skwEgJtWmcw3sClpKJAjJ81fE0+nv 3yVYwkGlWq5xqB+mgPj7oHXtoZevLwYGLb+XI30tYXUtgkruzfAbXYfxaljyWHWuG2zq KV0Uxgn9Y0ANLeW8kejWELA4KesgP+MOkzdgVf0hBSiVdafY6+yOqH2RO/pMb9Tdbatk xCyw== X-Gm-Message-State: APjAAAWnjHc851FFy4OtQExtH5fFPjfLvXJQhQOCu6Zg0p7TF8MIwHGF XXvSRSTHvZj+kcpxmERJ/xRiF5+JDC9MnnGv X-Google-Smtp-Source: APXvYqyQ4NMWwmcD+QNQXwycznUSrQ4ccjdMHmvJTyO2jY+wRoLxkzWub5WBnbxSwYjZ06st+3eMc86w9nXfL0n7 X-Received: by 2002:aed:3b09:: with SMTP id p9mr8634647qte.55.1553093540002; Wed, 20 Mar 2019 07:52:20 -0700 (PDT) Date: Wed, 20 Mar 2019 15:51:25 +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 11/20] tracing, arm64: untag user pointers in seq_print_user_ip 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_K=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 Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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. seq_print_user_ip() uses provided user pointers for vma lookups, which can only by done with untagged pointers. Untag user pointers in this function. Signed-off-by: Andrey Konovalov --- kernel/trace/trace_output.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c index 54373d93e251..6376bee93c84 100644 --- a/kernel/trace/trace_output.c +++ b/kernel/trace/trace_output.c @@ -370,6 +370,7 @@ static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm, { struct file *file = NULL; unsigned long vmstart = 0; + unsigned long untagged_ip = untagged_addr(ip); int ret = 1; if (s->full) @@ -379,7 +380,7 @@ static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm, const struct vm_area_struct *vma; down_read(&mm->mmap_sem); - vma = find_vma(mm, ip); + vma = find_vma(mm, untagged_ip); if (vma) { file = vma->vm_file; vmstart = vma->vm_start; @@ -388,7 +389,7 @@ static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm, ret = trace_seq_path(s, &file->f_path); if (ret) trace_seq_printf(s, "[+0x%lx]", - ip - vmstart); + untagged_ip - vmstart); } up_read(&mm->mmap_sem); }