From patchwork Sat Nov 23 08:05:09 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chen Ridong X-Patchwork-Id: 13883797 Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) (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 5C49E16EB42; Sat, 23 Nov 2024 08:14:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.51 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732349697; cv=none; b=O/cpf4fjflVjOVD9VxJFUEZ+m8LrvkLtWtuzj6DxbbYma0Z0TeP7Z18nBgUoLXi1a5uaMsGSelwR5oKfwiMMDIFQ5P3xv+/zaRdC8/RpZyMmpP/s6lTG2BhLeaydBOXSWDpRKHjexO0iUmyv9qM48GMRPWnOj9VgdC1BfDPXYgs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732349697; c=relaxed/simple; bh=7tlLamZPrg2kK7rmzmbcfOuSyKFaE8jLagXf2MwKjPY=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=g4GI7Vv2Xb4exLynb4hdjk+lbSDORqCSI1mmEedHN52pnobttP4MBv7bg2EYauvQ+hl7pdhAEPEK9PcXAyAooLPsh6hR4K5MsmJgc4gAg+Nvm7E3F6KY6lJMSlN6HscErhOeNSkNAC4xujFDEsPX8AWCGo+73UGG3OnbUMk7lWo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com; spf=pass smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.51 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huaweicloud.com Received: from mail.maildlp.com (unknown [172.19.163.216]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTP id 4XwPrk4kGCz4f3kK2; Sat, 23 Nov 2024 16:14:30 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.128]) by mail.maildlp.com (Postfix) with ESMTP id 3B1EB1A018C; Sat, 23 Nov 2024 16:14:44 +0800 (CST) Received: from hulk-vt.huawei.com (unknown [10.67.174.121]) by APP4 (Coremail) with SMTP id gCh0CgAH44bcjkFnuN1dCg--.14086S4; Sat, 23 Nov 2024 16:14:44 +0800 (CST) From: Chen Ridong To: steffen.klassert@secunet.com, daniel.m.jordan@oracle.com, herbert@gondor.apana.org.au Cc: linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, chenridong@huawei.com, wangweiyang2@huawei.com Subject: [PATCH 2/2] padata: fix UAF in padata_reorder Date: Sat, 23 Nov 2024 08:05:09 +0000 Message-Id: <20241123080509.2573987-3-chenridong@huaweicloud.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241123080509.2573987-1-chenridong@huaweicloud.com> References: <20241123080509.2573987-1-chenridong@huaweicloud.com> Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CM-TRANSID: gCh0CgAH44bcjkFnuN1dCg--.14086S4 X-Coremail-Antispam: 1UD129KBjvJXoW7CFWxXw48KFyfCFy7ur4DJwb_yoW5Jry5pF W5CrW7JrW8Gr18Jw13ZFyxZryrWF1DuF13KFWrCFn3CrW3Jr18Arn7tw1FgryFgryvyw1D Zayqqa4xtwsFqFDanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUPab4IE77IF4wAFF20E14v26ryj6rWUM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28IrcIa0xkI8VA2jI8067AKxVWUXw A2048vs2IY020Ec7CjxVAFwI0_Gr0_Xr1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxS w2x7M28EF7xvwVC0I7IYx2IY67AKxVW7JVWDJwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxV W8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I0E14v2 6rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7xfMc Ij6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_ Jr0_Gr1lF7xvr2IYc2Ij64vIr41lc7CjxVAaw2AFwI0_JF0_Jw1l42xK82IYc2Ij64vIr4 1l4c8EcI0Ec7CjxVAaw2AFwI0_JF0_Jw1l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAq x4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r126r 1DMIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF 7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxV WUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjxU cBT5DUUUU X-CM-SenderInfo: hfkh02xlgr0w46kxt4xhlfz01xgou0bp/ From: Chen Ridong A bug was found when run ltp test: BUG: KASAN: slab-use-after-free in padata_find_next+0x29/0x1a0 Read of size 4 at addr ffff88bbfe003524 by task kworker/u113:2/3039206 CPU: 0 PID: 3039206 Comm: kworker/u113:2 Kdump: loaded Not tainted 6.6.0+ Workqueue: pdecrypt_parallel padata_parallel_worker Call Trace: dump_stack_lvl+0x32/0x50 print_address_description.constprop.0+0x6b/0x3d0 print_report+0xdd/0x2c0 kasan_report+0xa5/0xd0 padata_find_next+0x29/0x1a0 padata_reorder+0x131/0x220 padata_parallel_worker+0x3d/0xc0 process_one_work+0x2ec/0x5a0 If 'mdelay(10)' is added before calling 'padata_find_next' in the 'padata_reorder' function, this issue could be reproduced easily with ltp test (pcrypt_aead01). This can be explained as bellow: pcrypt_aead_encrypt ... padata_do_parallel refcount_inc(&pd->refcnt); // add refcnt ... padata_do_serial padata_reorder // pd while (1) { padata_find_next(pd, true); // using pd queue_work_on ... padata_serial_worker crypto_del_alg padata_put_pd_cnt // sub refcnt padata_free_shell padata_put_pd(ps->pd); // pd is freed // loop again, but pd is freed // call padata_find_next, UAF } In the padata_reorder function, when it loops in 'while', if the alg is deleted, the refcnt may be decreased to 0 before entering 'padata_find_next', which leads to UAF, To fix this issue, add refcnt in the padata_reorder to avoid UAF. Fixes: b128a3040935 ("padata: allocate workqueue internally") Signed-off-by: Chen Ridong Signed-off-by: Qu Zicheng --- kernel/padata.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/padata.c b/kernel/padata.c index 5d8e18cdcb25..627014825266 100644 --- a/kernel/padata.c +++ b/kernel/padata.c @@ -319,6 +319,7 @@ static void padata_reorder(struct parallel_data *pd) if (!spin_trylock_bh(&pd->lock)) return; + padata_get_pd(pd); while (1) { padata = padata_find_next(pd, true); @@ -355,6 +356,7 @@ static void padata_reorder(struct parallel_data *pd) reorder = per_cpu_ptr(pd->reorder_list, pd->cpu); if (!list_empty(&reorder->list) && padata_find_next(pd, false)) queue_work(pinst->serial_wq, &pd->reorder_work); + padata_put_pd(pd); } static void invoke_padata_reorder(struct work_struct *work)