From patchwork Tue May 26 18:53:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 11571125 X-Patchwork-Delegate: herbert@gondor.apana.org.au 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 498D114B7 for ; Tue, 26 May 2020 19:27:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3208620C56 for ; Tue, 26 May 2020 19:27:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590521266; bh=UepWdnsWpDppgVk5vfkJFKBUbmMK8J+U8pMrQTMIVVo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=tMyVTS2XxO5agYVLIJH38dgJzn2hP9qLS+kltgpeCPMTFci5D8920fivxBVGMe9CC fbzo0EacSEdzHZaA/ucL5yYR60JAtUFtvAvY8Fpcqrt2LfxXSiYB2d+m3j34yQMiR0 Dyj9WsVzqP8q86HE3f0Q6fw6gl5Yw8AfrjH6hIDg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391294AbgEZTD7 (ORCPT ); Tue, 26 May 2020 15:03:59 -0400 Received: from mail.kernel.org ([198.145.29.99]:59426 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390518AbgEZTD6 (ORCPT ); Tue, 26 May 2020 15:03:58 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 2C4CF20873; Tue, 26 May 2020 19:03:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590519837; bh=UepWdnsWpDppgVk5vfkJFKBUbmMK8J+U8pMrQTMIVVo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=h9mT6jN3zILXnD4vvt8XhHswIcGy9McAP7Jez2ru8JX/7ZIcJ2/BxHk7IqCqP3Hac ULG2Uwwpnb6DeZPKH8P4HIPTAqNkHfxLKRUF1allKANbTO6ZskqQy07fQDWW43l5mF nDnl4uZo78149NLWFUhMs4SLKqzF52oO+eJohnkA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Daniel Jordan , Herbert Xu , Steffen Klassert , linux-crypto@vger.kernel.org, Sasha Levin Subject: [PATCH 4.19 36/81] padata: initialize pd->cpu with effective cpumask Date: Tue, 26 May 2020 20:53:11 +0200 Message-Id: <20200526183931.357121297@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200526183923.108515292@linuxfoundation.org> References: <20200526183923.108515292@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org From: Daniel Jordan [ Upstream commit ec9c7d19336ee98ecba8de80128aa405c45feebb ] Exercising CPU hotplug on a 5.2 kernel with recent padata fixes from cryptodev-2.6.git in an 8-CPU kvm guest... # modprobe tcrypt alg="pcrypt(rfc4106(gcm(aes)))" type=3 # echo 0 > /sys/devices/system/cpu/cpu1/online # echo c > /sys/kernel/pcrypt/pencrypt/parallel_cpumask # modprobe tcrypt mode=215 ...caused the following crash: BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] SMP PTI CPU: 2 PID: 134 Comm: kworker/2:2 Not tainted 5.2.0-padata-base+ #7 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0- Workqueue: pencrypt padata_parallel_worker RIP: 0010:padata_reorder+0xcb/0x180 ... Call Trace: padata_do_serial+0x57/0x60 pcrypt_aead_enc+0x3a/0x50 [pcrypt] padata_parallel_worker+0x9b/0xe0 process_one_work+0x1b5/0x3f0 worker_thread+0x4a/0x3c0 ... In padata_alloc_pd, pd->cpu is set using the user-supplied cpumask instead of the effective cpumask, and in this case cpumask_first picked an offline CPU. The offline CPU's reorder->list.next is NULL in padata_reorder because the list wasn't initialized in padata_init_pqueues, which only operates on CPUs in the effective mask. Fix by using the effective mask in padata_alloc_pd. Fixes: 6fc4dbcf0276 ("padata: Replace delayed timer with immediate workqueue in padata_reorder") Signed-off-by: Daniel Jordan Cc: Herbert Xu Cc: Steffen Klassert Cc: linux-crypto@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Herbert Xu Signed-off-by: Daniel Jordan Signed-off-by: Sasha Levin --- kernel/padata.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/padata.c b/kernel/padata.c index 47dc31ce15ac..e9b8d517fd4b 100644 --- a/kernel/padata.c +++ b/kernel/padata.c @@ -451,7 +451,7 @@ static struct parallel_data *padata_alloc_pd(struct padata_instance *pinst, atomic_set(&pd->refcnt, 1); pd->pinst = pinst; spin_lock_init(&pd->lock); - pd->cpu = cpumask_first(pcpumask); + pd->cpu = cpumask_first(pd->cpumask.pcpu); INIT_WORK(&pd->reorder_work, invoke_padata_reorder); return pd; From patchwork Tue May 26 18:53:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 11571123 X-Patchwork-Delegate: herbert@gondor.apana.org.au 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 8329114B7 for ; Tue, 26 May 2020 19:27:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 69515208B8 for ; Tue, 26 May 2020 19:27:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590521262; bh=WV7IbrHAYVCDqblJW/OTmsebUR5xTis9sWm+fiP9KrM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=0plguu+fEAdkEvjDzFfsaB05R5rzABSJrpK/1PWhNIsQRG5TsdtVI/+GTY3YhvzM3 4rpBsNVAYEvvJ+U/NZZtiOJvgPoJP54oQRzoNBJzlwawTojv4tNmywJVpjkRB6Nods V5reSCfc4M4LWqJad0x3pBlz5mcCTXQJj+jnqwk8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391305AbgEZTEC (ORCPT ); Tue, 26 May 2020 15:04:02 -0400 Received: from mail.kernel.org ([198.145.29.99]:59484 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391300AbgEZTEA (ORCPT ); Tue, 26 May 2020 15:04:00 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id CEDC72086A; Tue, 26 May 2020 19:03:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590519840; bh=WV7IbrHAYVCDqblJW/OTmsebUR5xTis9sWm+fiP9KrM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AG4vIms247Mrx/rNO+AnSBZCpQ3z3mt0XbyoYPJrDICSF8CGU4+6AUO2E6g3sb9Nm CXj5giG6jLwVEYGF6seCSxVbsJsnvk+C6RgvSElz7XG1oaiqzY/V+7BwQ6A/hjoWqj xra0K8XfPWsJffNuuTbEuXqrDmJAJauu61tbsyu0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Daniel Jordan , Herbert Xu , Steffen Klassert , linux-crypto@vger.kernel.org, Sasha Levin Subject: [PATCH 4.19 37/81] padata: purge get_cpu and reorder_via_wq from padata_do_serial Date: Tue, 26 May 2020 20:53:12 +0200 Message-Id: <20200526183931.418181114@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200526183923.108515292@linuxfoundation.org> References: <20200526183923.108515292@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org From: Daniel Jordan [ Upstream commit 065cf577135a4977931c7a1e1edf442bfd9773dd ] With the removal of the padata timer, padata_do_serial no longer needs special CPU handling, so remove it. Signed-off-by: Daniel Jordan Cc: Herbert Xu Cc: Steffen Klassert Cc: linux-crypto@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Herbert Xu Signed-off-by: Daniel Jordan Signed-off-by: Sasha Levin --- kernel/padata.c | 23 +++-------------------- 1 file changed, 3 insertions(+), 20 deletions(-) diff --git a/kernel/padata.c b/kernel/padata.c index e9b8d517fd4b..93e4fb2d9f2e 100644 --- a/kernel/padata.c +++ b/kernel/padata.c @@ -324,24 +324,9 @@ static void padata_serial_worker(struct work_struct *serial_work) */ void padata_do_serial(struct padata_priv *padata) { - int cpu; - struct padata_parallel_queue *pqueue; - struct parallel_data *pd; - int reorder_via_wq = 0; - - pd = padata->pd; - - cpu = get_cpu(); - - /* We need to enqueue the padata object into the correct - * per-cpu queue. - */ - if (cpu != padata->cpu) { - reorder_via_wq = 1; - cpu = padata->cpu; - } - - pqueue = per_cpu_ptr(pd->pqueue, cpu); + struct parallel_data *pd = padata->pd; + struct padata_parallel_queue *pqueue = per_cpu_ptr(pd->pqueue, + padata->cpu); spin_lock(&pqueue->reorder.lock); list_add_tail(&padata->list, &pqueue->reorder.list); @@ -355,8 +340,6 @@ void padata_do_serial(struct padata_priv *padata) */ smp_mb__after_atomic(); - put_cpu(); - padata_reorder(pd); } EXPORT_SYMBOL(padata_do_serial);