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=-20.4 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,FSL_HELO_FAKE, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=ham 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 45170C4320A for ; Thu, 29 Jul 2021 16:52:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 298A360F43 for ; Thu, 29 Jul 2021 16:52:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230502AbhG2Qw7 (ORCPT ); Thu, 29 Jul 2021 12:52:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40756 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229614AbhG2Qw6 (ORCPT ); Thu, 29 Jul 2021 12:52:58 -0400 Received: from mail-wr1-x436.google.com (mail-wr1-x436.google.com [IPv6:2a00:1450:4864:20::436]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A9A53C061765 for ; Thu, 29 Jul 2021 09:52:53 -0700 (PDT) Received: by mail-wr1-x436.google.com with SMTP id d8so7747387wrm.4 for ; Thu, 29 Jul 2021 09:52:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=+D+WQ6dthjR+r0AdBLApfx1B5e7Pkkf4I29v7UyCASI=; b=juIc7gELG7oN7gWL10hEXKAxzCKfQ3+sXIXbR8NVbv6H6/8iyg7e5nZinla68omfBb pJpFFeqW+7tNmBT3QkjlBbDReKO8n2PbzQz3d77E7PZ0q/OrwNaBD97Aa9ZAvTjI2boz wt1J1hBbyiLjD0zz4d+HP27f045C5hKwbqgPpJCj8+eSu5Orkr4Vl1ZAf+4WDVyBXmcJ OZJEBITH+AOxbJko2FNW5gO3AMZQ/0O5QbdhFoa4zbUZnMlvy63Cf/GBBX+Gh5o/4Fbc r3MUSxUe13D+9pOCExT/UwXJemJzILzsz9i7KJQdbLvRY6qX2Cj9v4tai1maVHI/jTRe B0+Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=+D+WQ6dthjR+r0AdBLApfx1B5e7Pkkf4I29v7UyCASI=; b=No20V8PjsKFCD1npg4+B9xbhWedDYvG5EwSVsUAMm/6idaX1YABM6k2p1oKSWI0LWA LOs96SBR+k7fpZuOsXvYccHI2les5Y+DWvgqvCniMQptyIs3l/1uKYp99ACRn21LcYIU sAJjelE/44sUaJKblGZ8gXm35swMQGXS9h+14ExZXDlY2DXghTv2kfudL4GAul2+tD6w G1v1zsLTJ58Dl0UrzRRLHjGlNZ3isSP9fSDTSt00Bd/ss47uf6hEJM8j4oQkOsdS9unz V47F7v2FwqTzGNiSNGrvl1Q/3vctMTH5H6mlYUvCsVLYMUX6XjNpWAbEaRYj26+TUVlf sZMw== X-Gm-Message-State: AOAM532P5z1CGbwxMeZ/a6m7DuO9vW1H8WPHRq3Vl297PAQhr5ENcndp SK1IKPacg3cT+BEv98KYIbzOGw== X-Google-Smtp-Source: ABdhPJyuOEXmaCM+TGYzMuW7Y5FKOpp4wnpTdqH3IdxX/TQTz9aynuGEL16s1B6g9wYjmkjo8JDYfA== X-Received: by 2002:a5d:54c7:: with SMTP id x7mr5939815wrv.77.1627577572042; Thu, 29 Jul 2021 09:52:52 -0700 (PDT) Received: from google.com ([2a00:79e0:d:210:293a:bc89:7514:5218]) by smtp.gmail.com with ESMTPSA id j1sm9301709wmo.4.2021.07.29.09.52.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Jul 2021 09:52:51 -0700 (PDT) Date: Thu, 29 Jul 2021 17:52:49 +0100 From: Quentin Perret To: David Brazdil Cc: kvmarm@lists.cs.columbia.edu, Marc Zyngier , James Morse , Alexandru Elisei , Suzuki K Poulose , Catalin Marinas , Will Deacon , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/2] KVM: arm64: Fix off-by-one in range_is_memory Message-ID: References: <20210728153232.1018911-1-dbrazdil@google.com> <20210728153232.1018911-2-dbrazdil@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210728153232.1018911-2-dbrazdil@google.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wednesday 28 Jul 2021 at 15:32:31 (+0000), David Brazdil wrote: > Hyp checks whether an address range only covers RAM by checking the > start/endpoints against a list of memblock_region structs. However, > the endpoint here is exclusive but internally is treated as inclusive. > Fix the off-by-one error that caused valid address ranges to be > rejected. > > Cc: Quentin Perret > Fixes: 90134ac9cabb6 ("KVM: arm64: Protect the .hyp sections from the host") > Signed-off-by: David Brazdil > --- > arch/arm64/kvm/hyp/nvhe/mem_protect.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvhe/mem_protect.c > index d938ce95d3bd..a6ce991b1467 100644 > --- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c > +++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c > @@ -193,7 +193,7 @@ static bool range_is_memory(u64 start, u64 end) > { > struct kvm_mem_range r1, r2; > > - if (!find_mem_range(start, &r1) || !find_mem_range(end, &r2)) > + if (!find_mem_range(start, &r1) || !find_mem_range(end - 1, &r2)) > return false; > if (r1.start != r2.start) > return false; Looks good to me: Reviewed-by: Quentin Perret Thanks, Quentin