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[83.57.170.138]) by smtp.gmail.com with ESMTPSA id s15sm3523323wmj.41.2020.07.21.05.31.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Jul 2020 05:31:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=1LYxaK4R3HUEmGLUbGgn11bqBUGERs5MJcjFZdKr0NE=; b=O9RO54sVGIGU6ILYXz2UtHQZ2yyrRB+XtanaHNQoaApgdexOCpt2IuCqjSlYJpzZg8 0X4ZjAsOj7F9DDZybZlRSXEFaWlfyI4FCCcNC9Hpb34riN6RRsMtdzhqLhk3dpmCR74a HKlIIt+atL9Z1Ph735k0T8Xy7Jj0Fbrlghk2fpn4Zoc7zjqhbqkg3r1XDGAOKQVR/JLo KAEg7obNDp+hGv0DzS4ZrvyyI0fzyhEJmakLfEhRSfyyuDs8X66cysrrMbW4mYoIIvfN YXGjnbb8JXPv8yMtr1siu7T95ybWCrldNy6T7xW3JbedlboD7YtVcycEOTxCqARTPvoy qWgA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :in-reply-to:references:mime-version:content-transfer-encoding; bh=1LYxaK4R3HUEmGLUbGgn11bqBUGERs5MJcjFZdKr0NE=; b=UXhf4xPC1Mg9QgG9flXbE8ipj6Oz/nziD84Hj+4/2JwZxYCianvPKqUP8Qv7zUzbNL +VriRHy0fzGeuG24480XdC8x8LPYFEvZN2W4SIa1zQhLsSQ6d7UoNK0WXm6FGXfrxh4a JmV07N+FciBw8jQ0nNEPZVIj03EKxCyyGyJ6z0sJoKZNluc4L5QA06NAgJMKxpsrXf7L 8jyQobYkT8SJZSYgYr5kavY3S1TYaIiQ8XYmtjJ6mLMx7usG2zanzrjIUcrMbJPP6BZ3 tkvppUn2vqqzRPAKxdaqxyP1zYPY7Dgi5j6YW1OJxY6Z8EUxw7tO2qWnk7RgyE6onZF9 Su9Q== X-Gm-Message-State: AOAM530pM3CNuIXZVsDSRhGN5m1GAYciiHkthqrg31uZdv8xtPNIdfkr 4tLwpw5mfEF4UycRTUyych/ZSXbYgSc= X-Google-Smtp-Source: ABdhPJxlaFePuxnI96FbVRNPb+OmM5KORsKJ0vlkSUHhQ64ImaH6ii5AirbyW7to55P7LcNPO8qFzA== X-Received: by 2002:adf:f289:: with SMTP id k9mr9547049wro.203.1595334719012; Tue, 21 Jul 2020 05:31:59 -0700 (PDT) From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Subject: [RFC PATCH-for-5.1? v3 2/2] hw/isa/isa-bus: Ensure ISA I/O regions are 8/16/32-bit accessible Date: Tue, 21 Jul 2020 14:31:54 +0200 Message-Id: <20200721123154.5302-3-f4bug@amsat.org> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20200721123154.5302-1-f4bug@amsat.org> References: <20200721123154.5302-1-f4bug@amsat.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::443; envelope-from=philippe.mathieu.daude@gmail.com; helo=mail-wr1-x443.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: 0 X-Spam_score: 0.0 X-Spam_bar: / X-Spam_report: (0.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=1, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , "Daniel P . Berrange" , "Michael S . Tsirkin" , Richard Henderson , Michael Tokarev , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Anthony Perard , Paolo Bonzini Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Since commit 5d971f9e67 we don't accept mismatching sizes in memory_region_access_valid(). This gives troubles when a device is on an ISA bus, because the CPU is free to use 8/16-bit accesses on the bus (or up to 32-bit on EISA bus), regardless what range is valid for the device. Monkey-patch the ISA device MemoryRegionOps to force it to accepts 8/16/32-bit accesses. This should be reverted after the release and fixed in a more elegant manner. Related bug reports: - https://lore.kernel.org/xen-devel/20200630170913.123646-1-anthony.perard@= citrix.com/T/ - https://bugs.debian.org/964793 - https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=3D964247 - https://bugs.launchpad.net/bugs/1886318 Signed-off-by: Philippe Mathieu-Daud=C3=A9 --- hw/isa/isa-bus.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/hw/isa/isa-bus.c b/hw/isa/isa-bus.c index 58fde178f9..c8aed2f55f 100644 --- a/hw/isa/isa-bus.c +++ b/hw/isa/isa-bus.c @@ -132,6 +132,20 @@ static inline void isa_init_ioport(ISADevice *dev, uin= t16_t ioport) =20 void isa_register_ioport(ISADevice *dev, MemoryRegion *io, uint16_t start) { + if (io->ops->valid.min_access_size > 1 || + io->ops->valid.max_access_size < 4) { + warn_report_once("Monkey-patching ISA I/O access sizes " + "(side effect of CVE-2020-13754, only for QEMU v5= .1)"); + /* + * To be backward compatible with IBM-PC bus, ISA bus must accept + * 8-bit accesses. + */ + io->ops->valid.min_access_size =3D 1; + /* + * EISA bus must accept 32-bit accesses. + */ + io->ops->valid.max_access_size =3D 4; + } memory_region_add_subregion(isabus->address_space_io, start, io); isa_init_ioport(dev, start); } --=20 2.21.3