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[209.132.180.67]) by mx.google.com with ESMTP id c12-v6si820820plm.478.2018.03.16.02.09.58; Fri, 16 Mar 2018 02:10:12 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753543AbeCPJHc (ORCPT + 99 others); Fri, 16 Mar 2018 05:07:32 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:52436 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753519AbeCPJH3 (ORCPT ); Fri, 16 Mar 2018 05:07:29 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id F00B0406E8D2; Fri, 16 Mar 2018 09:07:28 +0000 (UTC) Received: from madcap2.tricolour.ca (ovpn-112-12.rdu2.redhat.com [10.10.112.12]) by smtp.corp.redhat.com (Postfix) with ESMTP id A13AE10B00A2; Fri, 16 Mar 2018 09:07:25 +0000 (UTC) From: Richard Guy Briggs To: cgroups@vger.kernel.org, containers@lists.linux-foundation.org, linux-api@vger.kernel.org, Linux-Audit Mailing List , linux-fsdevel@vger.kernel.org, LKML , netdev@vger.kernel.org Cc: luto@kernel.org, jlayton@redhat.com, carlos@redhat.com, viro@zeniv.linux.org.uk, dhowells@redhat.com, simo@redhat.com, eparis@parisplace.org, serge@hallyn.com, ebiederm@xmission.com, madzcar@gmail.com, Richard Guy Briggs Subject: [RFC PATCH ghak32 V2 13/13] debug audit: read container ID of a process Date: Fri, 16 Mar 2018 05:00:40 -0400 Message-Id: <1081821010c124fe4e35984ec3dac1654453bb7c.1521179281.git.rgb@redhat.com> In-Reply-To: References: In-Reply-To: References: X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.7]); Fri, 16 Mar 2018 09:07:29 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.7]); Fri, 16 Mar 2018 09:07:29 +0000 (UTC) for IP:'10.11.54.3' DOMAIN:'int-mx03.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'rgb@redhat.com' RCPT:'' Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add support for reading the container ID from the proc filesystem. This is a read from the proc entry of the form /proc/PID/containerid where PID is the process ID of the task whose container ID is sought. The read expects up to a u64 value (unset: 18446744073709551615). Signed-off-by: Richard Guy Briggs --- fs/proc/base.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/fs/proc/base.c b/fs/proc/base.c index 6ce4fbe..f66d1e2 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -1300,6 +1300,21 @@ static ssize_t proc_sessionid_read(struct file * file, char __user * buf, .llseek = generic_file_llseek, }; +static ssize_t proc_containerid_read(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + struct inode *inode = file_inode(file); + struct task_struct *task = get_proc_task(inode); + ssize_t length; + char tmpbuf[TMPBUFLEN*2]; + + if (!task) + return -ESRCH; + length = scnprintf(tmpbuf, TMPBUFLEN*2, "%llu", audit_get_containerid(task)); + put_task_struct(task); + return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); +} + static ssize_t proc_containerid_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { @@ -1330,6 +1345,7 @@ static ssize_t proc_containerid_write(struct file *file, const char __user *buf, } static const struct file_operations proc_containerid_operations = { + .read = proc_containerid_read, .write = proc_containerid_write, .llseek = generic_file_llseek, }; @@ -2996,7 +3012,7 @@ static int proc_pid_patch_state(struct seq_file *m, struct pid_namespace *ns, #ifdef CONFIG_AUDITSYSCALL REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), REG("sessionid", S_IRUGO, proc_sessionid_operations), - REG("containerid", S_IWUSR, proc_containerid_operations), + REG("containerid", S_IWUSR|S_IRUSR, proc_containerid_operations), #endif #ifdef CONFIG_FAULT_INJECTION REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), @@ -3391,7 +3407,7 @@ static int proc_tid_comm_permission(struct inode *inode, int mask) #ifdef CONFIG_AUDITSYSCALL REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), REG("sessionid", S_IRUGO, proc_sessionid_operations), - REG("containerid", S_IWUSR, proc_containerid_operations), + REG("containerid", S_IWUSR|S_IRUSR, proc_containerid_operations), #endif #ifdef CONFIG_FAULT_INJECTION REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), -- 1.8.3.1