From patchwork Tue Oct 13 17:04:19 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Seth Forshee X-Patchwork-Id: 7386981 Return-Path: X-Original-To: patchwork-linux-fsdevel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 99CD39F1B9 for ; Tue, 13 Oct 2015 17:06:35 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id ADC8720780 for ; Tue, 13 Oct 2015 17:06:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B97402077D for ; Tue, 13 Oct 2015 17:06:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753288AbbJMRGL (ORCPT ); Tue, 13 Oct 2015 13:06:11 -0400 Received: from mail-ig0-f174.google.com ([209.85.213.174]:34909 "EHLO mail-ig0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753282AbbJMRFe (ORCPT ); Tue, 13 Oct 2015 13:05:34 -0400 Received: by igbkq10 with SMTP id kq10so97071967igb.0 for ; Tue, 13 Oct 2015 10:05:33 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=SkUEOy/+bMHH6lGCaY0ndjUGVZ7HktFyeBtvm5KsdD0=; b=QuZ6qIUeSUPj+rkBXNiJGCzl6QVFMyXbSHhpYa2HMMjoYqhk2Tqdn095+w0iZh2ejD ynaify0me4xHTfCIFj8dC/ps0wyqR2/h3wS3bm0QyDxWJbI7cN/fuajxU0/MaOi3YCG4 A5prE7maaGxxb/EQV5edIsqctpLZUDSfxImPO+QcksO6Si3OQsT6uV/r5iR7zDL2gB+P 56hXqOKg9iIuI+sYMUk/xBIxpDWRv047txzgezQHpDuDvF1tp2IYBcaJePAlGps7q4e6 8KWmbWx7IW0qEgbyaYKjpq/lq1IiXUoY/17b8mqWxj6EtVGyr6oPNQm6Pi+9812pl2Sr QFTQ== X-Gm-Message-State: ALoCoQn3f3RNJcLuYFHPziaLkLAutffWtp5h2hNvyuFbeCBeb7FTFtFaaRipPpaUvFri26pGktvs X-Received: by 10.50.32.69 with SMTP id g5mr15761088igi.35.1444755933651; Tue, 13 Oct 2015 10:05:33 -0700 (PDT) Received: from localhost (199-87-125-144.dyn.kc.surewest.net. [199.87.125.144]) by smtp.gmail.com with ESMTPSA id z27sm1887619ioi.36.2015.10.13.10.05.32 (version=TLSv1.2 cipher=RC4-SHA bits=128/128); Tue, 13 Oct 2015 10:05:33 -0700 (PDT) From: Seth Forshee To: "Eric W. Biederman" , Alexander Viro , Serge Hallyn , James Morris , "Serge E. Hallyn" Cc: Andy Lutomirski , linux-fsdevel@vger.kernel.org, linux-security-module@vger.kernel.org, selinux@tycho.nsa.gov, linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org, linux-bcache@vger.kernel.org, dm-devel@redhat.com, linux-raid@vger.kernel.org, Seth Forshee Subject: [PATCH v2 6/7] userns: Replace in_userns with current_in_userns Date: Tue, 13 Oct 2015 12:04:19 -0500 Message-Id: <1444755861-54997-7-git-send-email-seth.forshee@canonical.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1444755861-54997-1-git-send-email-seth.forshee@canonical.com> References: <1444755861-54997-1-git-send-email-seth.forshee@canonical.com> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP All current callers of in_userns pass current_user_ns as the first argument. Simplify by replacing in_userns with current_in_userns which checks whether current_user_ns is in the namespace supplied as an argument. Signed-off-by: Seth Forshee --- fs/namespace.c | 2 +- include/linux/user_namespace.h | 6 ++---- kernel/user_namespace.c | 6 +++--- security/commoncap.c | 2 +- 4 files changed, 7 insertions(+), 9 deletions(-) diff --git a/fs/namespace.c b/fs/namespace.c index 2101ce7b96ab..18fc58760aec 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -3286,7 +3286,7 @@ bool mnt_may_suid(struct vfsmount *mnt) * in other namespaces. */ return !(mnt->mnt_flags & MNT_NOSUID) && check_mnt(real_mount(mnt)) && - in_userns(current_user_ns(), mnt->mnt_sb->s_user_ns); + current_in_userns(mnt->mnt_sb->s_user_ns); } static struct ns_common *mntns_get(struct task_struct *task) diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h index a43faa727124..9217169c64cb 100644 --- a/include/linux/user_namespace.h +++ b/include/linux/user_namespace.h @@ -72,8 +72,7 @@ extern ssize_t proc_projid_map_write(struct file *, const char __user *, size_t, extern ssize_t proc_setgroups_write(struct file *, const char __user *, size_t, loff_t *); extern int proc_setgroups_show(struct seq_file *m, void *v); extern bool userns_may_setgroups(const struct user_namespace *ns); -extern bool in_userns(const struct user_namespace *ns, - const struct user_namespace *target_ns); +extern bool current_in_userns(const struct user_namespace *target_ns); #else static inline struct user_namespace *get_user_ns(struct user_namespace *ns) @@ -103,8 +102,7 @@ static inline bool userns_may_setgroups(const struct user_namespace *ns) return true; } -static inline bool in_userns(const struct user_namespace *ns, - const struct user_namespace *target_ns) +static inline bool current_in_userns(const struct user_namespace *target_ns) { return true; } diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c index 69fbc377357b..5960edc7e644 100644 --- a/kernel/user_namespace.c +++ b/kernel/user_namespace.c @@ -949,10 +949,10 @@ bool userns_may_setgroups(const struct user_namespace *ns) * Returns true if @ns is the same namespace as or a descendant of * @target_ns. */ -bool in_userns(const struct user_namespace *ns, - const struct user_namespace *target_ns) +bool current_in_userns(const struct user_namespace *target_ns) { - for (; ns; ns = ns->parent) { + struct user_namespace *ns; + for (ns = current_user_ns(); ns; ns = ns->parent) { if (ns == target_ns) return true; } diff --git a/security/commoncap.c b/security/commoncap.c index 6243aef5860e..2119421613f6 100644 --- a/security/commoncap.c +++ b/security/commoncap.c @@ -450,7 +450,7 @@ static int get_file_caps(struct linux_binprm *bprm, bool *effective, bool *has_c if (!mnt_may_suid(bprm->file->f_path.mnt)) return 0; - if (!in_userns(current_user_ns(), bprm->file->f_path.mnt->mnt_sb->s_user_ns)) + if (!current_in_userns(bprm->file->f_path.mnt->mnt_sb->s_user_ns)) return 0; rc = get_vfs_caps_from_disk(bprm->file->f_path.dentry, &vcaps);