From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id ADA87C43612 for ; Fri, 11 Jan 2019 15:06:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 75F562084C for ; Fri, 11 Jan 2019 15:06:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1547219217; bh=9ES5nj9/RJdo1PbDyJC1bdkX/CHN7CEIzipdXkPOxWQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=tBpxwpwPQHIe2FIF9xBT366VuVGUcmy6UPY1pKB+++msfxCVPA9ujQfMupWN4nLC1 R5ogRdMsXfQopzX3Tg0WI+ueOm4mRSyhLXqifyTcHRfSbI4Qc3MUQfH44itOZinf10 Uq8r4VtilvEi1E+lMsMY5c1TY40b4joOZ/ykS2uY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387781AbfAKO2t (ORCPT ); Fri, 11 Jan 2019 09:28:49 -0500 Received: from mail.kernel.org ([198.145.29.99]:47640 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388214AbfAKO2s (ORCPT ); Fri, 11 Jan 2019 09:28:48 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.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 4D6952133F; Fri, 11 Jan 2019 14:28:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1547216927; bh=9ES5nj9/RJdo1PbDyJC1bdkX/CHN7CEIzipdXkPOxWQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=P1aqaCrUgrpmAYtDcJrfSq3GSGio8eHzuu1f0/CtlHiJbDSIoNVFlJVx7aG9NyiI1 /ROmzJSmEXx+UAhrJZR4wFlhTLceGRK40Qh4HH/WLOYSz/ss0GcetfCiEV9yQ95ycc FjQjhsJm8b4rirmkRH2yF6SJr04oQj3a2mmng7OA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, linux-crypto@vger.kernel.org, Martin Willi , Eric Biggers , Ard Biesheuvel Subject: [PATCH 4.9 42/63] crypto: x86/chacha20 - avoid sleeping with preemption disabled Date: Fri, 11 Jan 2019 15:14:45 +0100 Message-Id: <20190111131052.654348898@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190111131046.387528003@linuxfoundation.org> References: <20190111131046.387528003@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Biggers In chacha20-simd, clear the MAY_SLEEP flag in the blkcipher_desc to prevent sleeping with preemption disabled, under kernel_fpu_begin(). This was fixed upstream incidentally by a large refactoring, commit 9ae433bc79f9 ("crypto: chacha20 - convert generic and x86 versions to skcipher"). But syzkaller easily trips over this when running on older kernels, as it's easily reachable via AF_ALG. Therefore, this patch makes the minimal fix for older kernels. Fixes: c9320b6dcb89 ("crypto: chacha20 - Add a SSSE3 SIMD variant for x86_64") Cc: linux-crypto@vger.kernel.org Cc: Martin Willi Signed-off-by: Eric Biggers Acked-by: Ard Biesheuvel Signed-off-by: Greg Kroah-Hartman --- arch/x86/crypto/chacha20_glue.c | 1 + 1 file changed, 1 insertion(+) --- a/arch/x86/crypto/chacha20_glue.c +++ b/arch/x86/crypto/chacha20_glue.c @@ -77,6 +77,7 @@ static int chacha20_simd(struct blkciphe blkcipher_walk_init(&walk, dst, src, nbytes); err = blkcipher_walk_virt_block(desc, &walk, CHACHA20_BLOCK_SIZE); + desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; crypto_chacha20_init(state, crypto_blkcipher_ctx(desc->tfm), walk.iv);