From nobody Sat Nov 30 06:33:53 2024 Received: from mta-65-227.siemens.flowmailer.net (mta-65-227.siemens.flowmailer.net [185.136.65.227]) (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 E0C321AED2E for ; Wed, 11 Sep 2024 16:23:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.136.65.227 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726071817; cv=none; b=Udk/01UNw+mx3HN9SMkWu9Ie9QTrKQica5olC/yL507Yb080TURjGZmwbnel9run0f9StoP/EvzHMkF0+7TrANdJIBtNr6zlrbNa+VJ+KXbosInH/IHjIsdvomeBBApMmuIAcWRLIYFpdbIbiKxu5SiTsN5ca1GBRsWnGyP3yng= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726071817; c=relaxed/simple; bh=y+lt7r74UJXmUaDLzhkQeYyRS6DuNdsUXj1h0SDurT4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=RoC3HoMdtnLWn84FAQZ3bJ8Xp5W4krt+UUNWZtnm7e3u3kY6EmI9JlAgAHwl1Vify4U1v3ANQTnwaCjRyNpP3KaVK7eKu8P5vzx1Q23/yF/OcDu/Oxjvt5q6zwdVNHAgAUZ+Id8cjqd1Ft1sjoLTzzr2F/LuMpYllgBvgaapd2Q= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=siemens.com; spf=pass smtp.mailfrom=rts-flowmailer.siemens.com; dkim=pass (2048-bit key) header.d=siemens.com header.i=felix.moessbauer@siemens.com header.b=U283/qOH; arc=none smtp.client-ip=185.136.65.227 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=siemens.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rts-flowmailer.siemens.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=siemens.com header.i=felix.moessbauer@siemens.com header.b="U283/qOH" Received: by mta-65-227.siemens.flowmailer.net with ESMTPSA id 202409111623275d3984dd0b0b168937 for ; Wed, 11 Sep 2024 18:23:27 +0200 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; s=fm1; d=siemens.com; i=felix.moessbauer@siemens.com; h=Date:From:Subject:To:Message-ID:MIME-Version:Content-Type:Content-Transfer-Encoding:Cc:References:In-Reply-To; bh=ukk2ZxcuU4qD+efg80mQqUmpuA7cmcAn4YLMH6OPZfM=; b=U283/qOHpLJJvulEwssviMg53NEd6JVnVDoNfKg0OA/I7rbmoMmEhWEO5HRyJ3f7CzpG3/ +6VGlIY3P0l0rXFlj1/VUV8+Gvb+AhlVjIwvF3jRW1bPMafqtVY6jTPDI3v43DhOf5TrDR3l 2Wz7ydz0YWDYO6bJ2JQE3NHUEnuH8enRUbspW/knI6Qr/hRbvqnobrcFFrNS4fn2tq9WaebS uolU1Khx9WDBqSijPvPN6yBwnBZGTWJAON5Mfz0+TT0/GlG+WYNDVuLVbAc5SO+gwx8G8S9N v1L1yWT92W53LFkom8NdApe8GNEhJOnILhFl6Q00sfytLAVUDNy8XB4A==; From: Felix Moessbauer To: axboe@kernel.dk Cc: stable@vger.kernel.org, asml.silence@gmail.com, linux-kernel@vger.kernel.org, io-uring@vger.kernel.org, cgroups@vger.kernel.org, dqminh@cloudflare.com, longman@redhat.com, adriaan.schmidt@siemens.com, florian.bezdeka@siemens.com, Felix Moessbauer Subject: [PATCH 6.1 1/2] io_uring/io-wq: do not allow pinning outside of cpuset Date: Wed, 11 Sep 2024 18:23:15 +0200 Message-Id: <20240911162316.516725-2-felix.moessbauer@siemens.com> In-Reply-To: <20240911162316.516725-1-felix.moessbauer@siemens.com> References: <20240911162316.516725-1-felix.moessbauer@siemens.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Flowmailer-Platform: Siemens Feedback-ID: 519:519-1321639:519-21489:flowmailer Content-Type: text/plain; charset="utf-8" commit 0997aa5497c714edbb349ca366d28bd550ba3408 upstream. The io worker threads are userland threads that just never exit to the userland. By that, they are also assigned to a cgroup (the group of the creating task). When changing the affinity of the io_wq thread via syscall, we must only allow cpumasks within the limits defined by the cpuset controller of the cgroup (if enabled). Fixes: da64d6db3bd3 ("io_uring: One wqe per wq") Signed-off-by: Felix Moessbauer --- io_uring/io-wq.c | 25 +++++++++++++++++++------ 1 file changed, 19 insertions(+), 6 deletions(-) diff --git a/io_uring/io-wq.c b/io_uring/io-wq.c index 139cd49b2c27..c74bcc8d2f06 100644 --- a/io_uring/io-wq.c +++ b/io_uring/io-wq.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include #include @@ -1362,22 +1363,34 @@ static int io_wq_cpu_offline(unsigned int cpu, stru= ct hlist_node *node) =20 int io_wq_cpu_affinity(struct io_uring_task *tctx, cpumask_var_t mask) { + cpumask_var_t allowed_mask; + int ret =3D 0; int i; =20 if (!tctx || !tctx->io_wq) return -EINVAL; =20 + if (!alloc_cpumask_var(&allowed_mask, GFP_KERNEL)) + return -ENOMEM; + cpuset_cpus_allowed(tctx->io_wq->task, allowed_mask); + rcu_read_lock(); for_each_node(i) { struct io_wqe *wqe =3D tctx->io_wq->wqes[i]; - - if (mask) - cpumask_copy(wqe->cpu_mask, mask); - else - cpumask_copy(wqe->cpu_mask, cpumask_of_node(i)); + if (mask) { + if (cpumask_subset(mask, allowed_mask)) + cpumask_copy(wqe->cpu_mask, mask); + else + ret =3D -EINVAL; + } else { + if (!cpumask_and(wqe->cpu_mask, cpumask_of_node(i), allowed_mask)) + cpumask_copy(wqe->cpu_mask, allowed_mask); + } } rcu_read_unlock(); - return 0; + + free_cpumask_var(allowed_mask); + return ret; } =20 /* --=20 2.39.2