From patchwork Mon Mar 18 17:17:42 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Konovalov X-Patchwork-Id: 10858215 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 7F7EC6C2 for ; Mon, 18 Mar 2019 17:18:51 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 61A68293A0 for ; Mon, 18 Mar 2019 17:18:51 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5463F293C3; Mon, 18 Mar 2019 17:18:51 +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 F2266293A0 for ; Mon, 18 Mar 2019 17:18:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727137AbfCRRSu (ORCPT ); Mon, 18 Mar 2019 13:18:50 -0400 Received: from mail-qk1-f202.google.com ([209.85.222.202]:53013 "EHLO mail-qk1-f202.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727994AbfCRRSU (ORCPT ); Mon, 18 Mar 2019 13:18:20 -0400 Received: by mail-qk1-f202.google.com with SMTP id k21so15302923qkg.19 for ; Mon, 18 Mar 2019 10:18:20 -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=Z+OUUKNgtK/1jfa4BvhYHhx7IjjNLQEUJY1NJ7A3vWEIk1RX9PbVSKhiX+wNpR0VVK rm+RSajsjJHCrhE1N6/tIuVP+q9XdaMCbwZRMPCgTCjx/L9P2gvJmmbwqvWCKBP9MeF4 Qw6j2LzWa+BeBhtFcRkoFqLNaB2ov3Vsincet7Xt01JgrRy0n0Px8l+DavyyXnsSQINI wfOpZ4cpDL384ukM2hnrV7HWIk5LriqFPiuoGB3tjO+kwnvk5ccqGZfvf45ZsEC8+Jc9 GnSLuoWMdhDxaKuqFTy4AAf17P9nihFjMbB/8eHPp3LiMDt9udnfahJfYpgVE4FXcX3j TbFg== 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=nB0tLXVmTFwE/m+tyjk+DT9tR3FY8rizY1Vyowjo9AvmLPQx+YWRcHxupsP4hn8O36 uBouuZpDzQz9j6DwbSOBxx9ACwxuoiDQ6NJnl8QUqkrJEDMKYVWAvKS5JGBOihIikeiv 1SQpW+pZwGqLjnU1FFDVjVYWT8D3BGqfuTbfO+xpnPEe0NdTGgfuUKNkeFJSsZVZ9KJz EToNYGg0RMK62YCzv2IJJ6VMvAK4sydSGtNaLXTIZY0hfPQ1nJ87FznGFIXoJSQLfbk3 xpv/Zm0knntWMQd+OKgppBC/uWCLrbUQX7JMvddligbyUkIfyWoE0tK7Of5jlGlMjqPl riRg== X-Gm-Message-State: APjAAAWdOjyokfXcFmHBFX8kjydg9PEpyB6T5tNNCaE+VtqKCbpjfp55 xPHT+rh+8FPu439mXVpcD9bq5rkQO7OrkU8C X-Google-Smtp-Source: APXvYqyJhTgZar+ik6UuyzlVr6SmEq6/15j430olxCWRyB477jKqfxZfFi3KkJC1jdRI+TAOqV2mqA21WihG+rqN X-Received: by 2002:ac8:21f2:: with SMTP id 47mr10994391qtz.9.1552929499883; Mon, 18 Mar 2019 10:18:19 -0700 (PDT) Date: Mon, 18 Mar 2019 18:17:42 +0100 In-Reply-To: Message-Id: <9733fd0b723aab6bcf4369fe366104ba795eb5a9.1552929301.git.andreyknvl@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.21.0.225.g810b269d1ac-goog Subject: [PATCH v12 10/13] 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 , 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 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); }