From patchwork Wed Apr 6 00:51:01 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Jason A. Donenfeld" X-Patchwork-Id: 12802640 X-Patchwork-Delegate: herbert@gondor.apana.org.au Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1D497C433FE for ; Wed, 6 Apr 2022 06:21:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232414AbiDFGR3 (ORCPT ); Wed, 6 Apr 2022 02:17:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46922 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1455683AbiDFFHX (ORCPT ); Wed, 6 Apr 2022 01:07:23 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6563E340891; Tue, 5 Apr 2022 17:51:23 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 85B8E6174A; Wed, 6 Apr 2022 00:51:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 39A13C385A6; Wed, 6 Apr 2022 00:51:22 +0000 (UTC) Authentication-Results: smtp.kernel.org; dkim=pass (1024-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b="hIYaCWog" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zx2c4.com; s=20210105; t=1649206280; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=uouxkXGt9ycAh2w6r1rTvJWeUR8k4JberlBMTjKHJDU=; b=hIYaCWog3ufYJF8fi+Nqrc/DStqXujrKuPnBerdcQRO+fmFdXQ2WISfN62Wfz4+Nl+CQI1 2gQAsgz3a+onmtIL1apt2OygDKTHH+mrbuEkt4OZ5VgTluoZgjCYiEOmQMuFc6Obcc66Ua 1KM/qFhTZYs0b59EKnMN4G5wE4q+Rc4= Received: by mail.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id 4753b291 (TLSv1.3:AEAD-AES256-GCM-SHA384:256:NO); Wed, 6 Apr 2022 00:51:20 +0000 (UTC) From: "Jason A. Donenfeld" To: linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org Cc: "Jason A. Donenfeld" , Jann Horn , Theodore Ts'o Subject: [PATCH] random: check for signals every PAGE_SIZE chunk of /dev/[u]random Date: Wed, 6 Apr 2022 02:51:01 +0200 Message-Id: <20220406005101.200148-1-Jason@zx2c4.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org In a651a7ba294c ("random: check for signal_pending() outside of need_resched() check"), Jann pointed out that we previously were only checking the TIF_NOTIFY_SIGNAL and TIF_SIGPENDING flags if the process had TIF_NEED_RESCHED set, which meant in practice, super long reads to /dev/[u]random would delay signal handling by a long time. I tried this, and indeed I wasn't able to interrupt a /dev/urandom read until after several megabytes had been read. The bug he fixed has always been there, and so code that reads from /dev/urandom without checking the return value of read() has mostly worked for a long time, for most sizes, not just for <= 256. Maybe it makes sense to keep that code working. The reason it was so small prior, ignoring the fact that it didn't work anyway, was likely because /dev/random used to block, and that could happen for pretty large lengths of time while entropy was gathered. But now, it's just a chacha20 call, which is extremely fast and is just operating on pure data, without having to wait for some external event. In that sense, /dev/[u]random is a lot more like /dev/zero. Taking a page out of /dev/zero's read_zero() function, it always returns at least one chunk, and then checks for signals after each chunk. Chunk sizes there are of length PAGE_SIZE. Let's just copy the same thing for /dev/[u]random, and check for signals and cond_resched() for every PAGE_SIZE amount of data. This makes the behavior more consistent with expectations, and should mitigate the impact of Jann's fix for the age-old signal check bug. Cc: Jann Horn Cc: Theodore Ts'o Signed-off-by: Jason A. Donenfeld --- drivers/char/random.c | 17 +++++++---------- 1 file changed, 7 insertions(+), 10 deletions(-) diff --git a/drivers/char/random.c b/drivers/char/random.c index 7f0253455d4e..e8a578af619a 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -523,7 +523,6 @@ EXPORT_SYMBOL(get_random_bytes); static ssize_t get_random_bytes_user(void __user *buf, size_t nbytes) { - bool large_request = nbytes > 256; ssize_t ret = 0; size_t len; u32 chacha_state[CHACHA_STATE_WORDS]; @@ -540,15 +539,6 @@ static ssize_t get_random_bytes_user(void __user *buf, size_t nbytes) crng_make_state(chacha_state, (u8 *)&chacha_state[4], CHACHA_KEY_SIZE); do { - if (large_request) { - if (signal_pending(current)) { - if (!ret) - ret = -ERESTARTSYS; - break; - } - cond_resched(); - } - chacha20_block(chacha_state, output); if (unlikely(chacha_state[12] == 0)) ++chacha_state[13]; @@ -562,6 +552,13 @@ static ssize_t get_random_bytes_user(void __user *buf, size_t nbytes) nbytes -= len; buf += len; ret += len; + + BUILD_BUG_ON(PAGE_SIZE % CHACHA_BLOCK_SIZE != 0); + if (!(ret % PAGE_SIZE) && nbytes) { + if (signal_pending(current)) + break; + cond_resched(); + } } while (nbytes); memzero_explicit(chacha_state, sizeof(chacha_state));