From patchwork Tue Feb 18 14:33:53 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Brauner X-Patchwork-Id: 11388699 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 89F94924 for ; Tue, 18 Feb 2020 14:36:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 74F5F20801 for ; Tue, 18 Feb 2020 14:36:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726801AbgBROfg (ORCPT ); Tue, 18 Feb 2020 09:35:36 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:52981 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726750AbgBROff (ORCPT ); Tue, 18 Feb 2020 09:35:35 -0500 Received: from ip5f5bf7ec.dynamic.kabel-deutschland.de ([95.91.247.236] helo=wittgenstein.fritz.box) by youngberry.canonical.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.86_2) (envelope-from ) id 1j43xv-0000fF-6f; Tue, 18 Feb 2020 14:35:11 +0000 From: Christian Brauner To: =?utf-8?q?St=C3=A9phane_Graber?= , "Eric W. Biederman" , Aleksa Sarai , Jann Horn Cc: smbarber@chromium.org, Seth Forshee , Alexander Viro , Alexey Dobriyan , Serge Hallyn , James Morris , Kees Cook , Jonathan Corbet , Phil Estes , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, containers@lists.linux-foundation.org, linux-security-module@vger.kernel.org, linux-api@vger.kernel.org, Christian Brauner Subject: [PATCH v3 07/25] proc: task_state(): use from_kfs{g,u}id_munged Date: Tue, 18 Feb 2020 15:33:53 +0100 Message-Id: <20200218143411.2389182-8-christian.brauner@ubuntu.com> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200218143411.2389182-1-christian.brauner@ubuntu.com> References: <20200218143411.2389182-1-christian.brauner@ubuntu.com> MIME-Version: 1.0 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: If fsid mappings have been written, this will cause proc to look at fsid mappings for the user namespace. If no fsid mappings have been written the behavior is as before. Here is part of the output from /proc//status from the initial user namespace for systemd running in an unprivileged container as user namespace root with id mapping 0 100000 100000 and fsid mapping 0 300000 100000: Name: systemd Umask: 0000 State: S (sleeping) Tgid: 13023 Ngid: 0 Pid: 13023 PPid: 13008 TracerPid: 0 Uid: 100000 100000 100000 300000 Gid: 100000 100000 100000 300000 FDSize: 64 Groups: Signed-off-by: Christian Brauner Acked-by: Serge Hallyn --- /* v2 */ unchanged /* v3 */ unchanged --- fs/proc/array.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/fs/proc/array.c b/fs/proc/array.c index 5efaf3708ec6..d4a04f85a67e 100644 --- a/fs/proc/array.c +++ b/fs/proc/array.c @@ -91,6 +91,7 @@ #include #include #include +#include #include #include @@ -193,11 +194,11 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns, seq_put_decimal_ull(m, "\nUid:\t", from_kuid_munged(user_ns, cred->uid)); seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->euid)); seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->suid)); - seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->fsuid)); + seq_put_decimal_ull(m, "\t", from_kfsuid_munged(user_ns, cred->fsuid)); seq_put_decimal_ull(m, "\nGid:\t", from_kgid_munged(user_ns, cred->gid)); seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->egid)); seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->sgid)); - seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->fsgid)); + seq_put_decimal_ull(m, "\t", from_kfsgid_munged(user_ns, cred->fsgid)); seq_put_decimal_ull(m, "\nFDSize:\t", max_fds); seq_puts(m, "\nGroups:\t");