From nobody Fri Dec 19 18:41:37 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 42245C38A2D for ; Mon, 24 Oct 2022 14:08:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230520AbiJXOI2 (ORCPT ); Mon, 24 Oct 2022 10:08:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41254 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237110AbiJXOEg (ORCPT ); Mon, 24 Oct 2022 10:04:36 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2869A60F7; Mon, 24 Oct 2022 05:49:27 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 533236128D; Mon, 24 Oct 2022 12:49:27 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 60150C433C1; Mon, 24 Oct 2022 12:49:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666615766; bh=cNzehMzxAo+SjDFKbnQaHGi1kSI6tMK7hRk8V6BETUw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dK46kNUaqgoLnvLYLH4KqMP8BsHDQ7qCfP78hzLuheM+0rhufnxALNXkXAUFj3QEg +107MNwqXShQIoYhq0DnPebP0ljEjmIF7+IYTGtq585Pjqvqgn2ItJUjnLKHoVRA7j GXCX5pGH2CGEiLO55yWZEc6pIVyoPqadkuxJXBlY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, =?UTF-8?q?Michal=20Koutn=C3=BD?= , Tejun Heo , Sasha Levin Subject: [PATCH 5.15 376/530] cgroup: Honor callers cgroup NS when resolving path Date: Mon, 24 Oct 2022 13:32:00 +0200 Message-Id: <20221024113102.058138114@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221024113044.976326639@linuxfoundation.org> References: <20221024113044.976326639@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Michal Koutn=C3=BD [ Upstream commit 74e4b956eb1cac0e4c10c240339b1bbfbc9a4c48 ] cgroup_get_from_path() is not widely used function. Its callers presume the path is resolved under cgroup namespace. (There is one caller currently and resolving in init NS won't make harm (netfilter). However, future users may be subject to different effects when resolving globally.) Since, there's currently no use for the global resolution, modify the existing function to take cgroup NS into account. Fixes: a79a908fd2b0 ("cgroup: introduce cgroup namespaces") Signed-off-by: Michal Koutn=C3=BD Signed-off-by: Tejun Heo Signed-off-by: Sasha Levin --- kernel/cgroup/cgroup.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c index 4b19f7fc4deb..a92990f070d1 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -6598,8 +6598,12 @@ struct cgroup *cgroup_get_from_path(const char *path) { struct kernfs_node *kn; struct cgroup *cgrp =3D ERR_PTR(-ENOENT); + struct cgroup *root_cgrp; =20 - kn =3D kernfs_walk_and_get(cgrp_dfl_root.cgrp.kn, path); + spin_lock_irq(&css_set_lock); + root_cgrp =3D current_cgns_cgroup_from_root(&cgrp_dfl_root); + kn =3D kernfs_walk_and_get(root_cgrp->kn, path); + spin_unlock_irq(&css_set_lock); if (!kn) goto out; =20 --=20 2.35.1