From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A9273148832; Fri, 6 Dec 2024 14:54:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733496873; cv=none; b=kRnkeiHJnecIJL5CgQsuN4/NJzianuanqAIVOlDTzto8A2PKwfx7oIBUS2H47md5tsvhcU5vovh6L4r3vrhEDOUB7bl/X6lA6Wq8Adax5qklif+x8SJtpgG40od1N2jC5K8yhYw3IOChCoJsla4Q1o3etbQMaRaxajelgXsKMk8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733496873; c=relaxed/simple; bh=Y8SFE5zlDq7hcmUI6y3EGNRl6edbSWsmye7kFYxHFw4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=KkpCuzJpJcvSPxTMD6aQ31gztYNIalgUwgY2Igv9jxKpFXulG++GOxGtcA8/KB9xf96A1AQLQQXo6l2xbswlUTTOX46ZKFOQZigOkSQ2+K9lCrFNdohECGzcbSuRQ8VyO/fEWxaqLAb63ZUWlc6+ZHK6zb4F7vOMvLRNeS1prdo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=r7H9RmGM; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="r7H9RmGM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CA292C4CED1; Fri, 6 Dec 2024 14:54:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1733496873; bh=Y8SFE5zlDq7hcmUI6y3EGNRl6edbSWsmye7kFYxHFw4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=r7H9RmGMIOHCSbG8GeYm3WbIz1g9pvqSKdmWlDfWk5+VNJfMIYmGAhk718qvGJ+Q3 SpsWtVuBPS60OLZ6dlBabHes4qdbp8B5gEOkLCTs2mn/XHQXaxGkxQkQlLwgoihSD0 PhBHikEoKMI8NnhXLzJ/B7wOUSj2qGDaDaqX+ORw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Chen Ridong , Tejun Heo , Sasha Levin Subject: [PATCH 6.6 130/676] cgroup/bpf: only cgroup v2 can be attached by bpf programs Date: Fri, 6 Dec 2024 15:29:09 +0100 Message-ID: <20241206143658.433567026@linuxfoundation.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241206143653.344873888@linuxfoundation.org> References: <20241206143653.344873888@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Chen Ridong [ Upstream commit 2190df6c91373fdec6db9fc07e427084f232f57e ] Only cgroup v2 can be attached by bpf programs, so this patch introduces that cgroup_bpf_inherit and cgroup_bpf_offline can only be called in cgroup v2, and this can fix the memleak mentioned by commit 04f8ef5643bc ("cgroup: Fix memory leak caused by missing cgroup_bpf_offline"), which has been reverted. Fixes: 2b0d3d3e4fcf ("percpu_ref: reduce memory footprint of percpu_ref in fast path") Fixes: 4bfc0bb2c60e ("bpf: decouple the lifetime of cgroup_bpf from cgroup itself") Link: https://lore.kernel.org/cgroups/aka2hk5jsel5zomucpwlxsej6iwnfw4qu5jkrmjhyfhesjlfdw@46zxhg5bdnr7/ Signed-off-by: Chen Ridong Signed-off-by: Tejun Heo Signed-off-by: Sasha Levin --- kernel/cgroup/cgroup.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c index d31cc406fb58e..36097e8c904fe 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -2096,8 +2096,10 @@ int cgroup_setup_root(struct cgroup_root *root, u16 ss_mask) if (ret) goto exit_stats; - ret = cgroup_bpf_inherit(root_cgrp); - WARN_ON_ONCE(ret); + if (root == &cgrp_dfl_root) { + ret = cgroup_bpf_inherit(root_cgrp); + WARN_ON_ONCE(ret); + } trace_cgroup_setup_root(root); @@ -5616,9 +5618,11 @@ static struct cgroup *cgroup_create(struct cgroup *parent, const char *name, if (ret) goto out_kernfs_remove; - ret = cgroup_bpf_inherit(cgrp); - if (ret) - goto out_psi_free; + if (cgrp->root == &cgrp_dfl_root) { + ret = cgroup_bpf_inherit(cgrp); + if (ret) + goto out_psi_free; + } /* * New cgroup inherits effective freeze counter, and @@ -5936,7 +5940,8 @@ static int cgroup_destroy_locked(struct cgroup *cgrp) cgroup1_check_for_release(parent); - cgroup_bpf_offline(cgrp); + if (cgrp->root == &cgrp_dfl_root) + cgroup_bpf_offline(cgrp); /* put the base reference */ percpu_ref_kill(&cgrp->self.refcnt); -- 2.43.0