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 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3DF1BC27C79 for ; Mon, 17 Jun 2024 14:36:51 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sJDT3-00028x-9N; Mon, 17 Jun 2024 10:36:21 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sJDT1-00028g-DD for qemu-devel@nongnu.org; Mon, 17 Jun 2024 10:36:19 -0400 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sJDSz-0006By-3W for qemu-devel@nongnu.org; Mon, 17 Jun 2024 10:36:19 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=mXgMFlHtXkdlZIRuUJZoE5pkelDv/IdLOWXpJwVLOP8=; b=fbUVzJyAzFiCo/CKM74cBQnS4L Q1RguLZ1xXdgi41kWKn69H5AwsD/MBMsBVjzpRnKtM1AirvOWExedE5MZMSPy81Sd3lRhqcvCVG/X HJaUiogpNyeiQGbLbVjbtLupIugyg6etYyFf11hj96L1rlkTqxcXmPCECjmkHxNToxIaozJKZehsR qT+L8e5y8o4AXkZc+UDmHbu22hwfoW2/EYO1AFUMs2ata+zQUvFXOJ6Toa5OM6LwS8eSH28lJLNzb fdkK0pPqHGa6crpNDNE2kBNxBK7dQS+4RhnZh/kyInxHXIWFwF2tvaMa4swpsZRhrsxbkQJqlXY9r 4hIF9LgQ==; Received: from [2001:8b0:10b:5:c4f8:5d04:40d9:40b5] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sJDSu-00000002Cyi-3A6x; Mon, 17 Jun 2024 14:36:12 +0000 Message-ID: <85a6700290a73a43b44f927b607a61a8ac32e0d1.camel@infradead.org> Subject: Re: [PATCH] hw/i386/fw_cfg: Add etc/e820 to fw_cfg late From: David Woodhouse To: Peter Maydell Cc: qemu-devel , "Michael S. Tsirkin" , Marcel Apfelbaum , Paolo Bonzini , Richard Henderson , Eduardo Habkost , Sergio Lopez Date: Mon, 17 Jun 2024 15:36:10 +0100 In-Reply-To: References: <3ce6d142356cb061b64d71a4e39525d9d7c52b12.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-L1HgA5kuO7ggj86LCZHQ" User-Agent: Evolution 3.44.4-0ubuntu2 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+5b424705a315da09b086+7603+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --=-L1HgA5kuO7ggj86LCZHQ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2024-06-17 at 15:15 +0100, Peter Maydell wrote: > On Mon, 17 Jun 2024 at 14:46, David Woodhouse wrote= : > >=20 > > From: David Woodhouse > >=20 > > In e820_add_entry() the e820_table is reallocated with g_renew() to mak= e > > space for a new entry. However, fw_cfg_arch_create() just uses the exis= ting > > e820_table pointer. > >=20 > > This leads to a use-after-free if anything adds a new entry after fw_cf= g > > is set up. Shift the addition of the etc/e820 file to the machine done > > notifier, and add a sanity check to ensure that e820_table isn't > > modified after the pointer gets stashed. >=20 > Given that e820_add_entry() will happily g_renew() the memory, > it seems a bit bug-prone to have e820_table be a global variable. > Maybe we should have an e820_add_fw_cfg_file() which does the >=20 > =C2=A0=C2=A0=C2=A0 fw_cfg_add_file(fw_cfg, "etc/e820", e820_table, > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 sizeof(struct e820_entry) * e820= _get_num_entries()); >=20 > -- that would then let us make e820_table be file-local, and so > it's then easy to audit that all the functions that look at > e820_table check that the table has been finalized first (because > they're all in this one file). Yeah, I pondered that, but wasn't sure I wanted to add a dependency on fw_cfg directly in the e820 code. So I pondered making e820_table static and using an accessor function... but then figured that since there's *already* an accessor for the table size, I could just use that. I suppose we could have a single function which returns both the table pointer *and* its size. It's a slight cleanup, but seemed like more churn that it was worth, and being C obviously it can't literally *return* both, so it just gets slightly ugly. Happy to do it if you feel strongly. > > Signed-off-by: David Woodhouse > > --- > > =C2=A0hw/i386/e820_memory_layout.c | 8 ++++++++ > > =C2=A0hw/i386/fw_cfg.c=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 | 7 ++++--- > > =C2=A0hw/i386/microvm.c=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0 | 5 +++-- > > =C2=A03 files changed, 15 insertions(+), 5 deletions(-) > >=20 > > diff --git a/hw/i386/e820_memory_layout.c b/hw/i386/e820_memory_layout.= c > > index 06970ac44a..c96515909e 100644 > > --- a/hw/i386/e820_memory_layout.c > > +++ b/hw/i386/e820_memory_layout.c > > @@ -8,13 +8,20 @@ > >=20 > > =C2=A0#include "qemu/osdep.h" > > =C2=A0#include "qemu/bswap.h" > > +#include "qemu/error-report.h" > > =C2=A0#include "e820_memory_layout.h" > >=20 > > =C2=A0static size_t e820_entries; > > =C2=A0struct e820_entry *e820_table; > > +static gboolean e820_done; > >=20 > > =C2=A0int e820_add_entry(uint64_t address, uint64_t length, uint32_t ty= pe) > > =C2=A0{ > > +=C2=A0=C2=A0=C2=A0 if (e820_done) { > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 warn_report("warning: E820 = modified after being consumed"); > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return -1; > > +=C2=A0=C2=A0=C2=A0 } >=20 > I think this should be a fatal error (i.e. assert) -- it should > never happen, and always would be a bug in QEMU somewhere. OK. > Currently e820_add_entry() returns the number of entries > currently present. Of the various callsites, almost all ignore > the return value. Two treat it as a "negative means error" > situation (with an error handling path that's currently dead code): > target/i386/kvm/kvm.c and target/i386/kvm/xen-emu.c. >=20 > My suggestion is that we make e820_add_entry() return void, > and remove that dead error handling path. 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