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[97.126.115.157]) by smtp.gmail.com with ESMTPSA id c7sm39148321pfh.18.2019.01.25.14.57.18 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 25 Jan 2019 14:57:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=8IXyEG4W5+YDCC6g8DrMGZK0JKjR2WU+35EBVQQqr7w=; b=d8rvM1wa6S6wutcPD09PqP1uYFitV0rOLsOfZetPh6ZBiWCsiicvrcPKVW6JAnGGn+ nc6oJtKZnKQoLgTITZ1VGcQXkiAXB8PGo7SKdepAcYXGV3E8zv+nhrfz9LZbcedRrXoi 42m4rhKJeXI1NiCPYyjzcbIDYU8hXpWppEj6I= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=8IXyEG4W5+YDCC6g8DrMGZK0JKjR2WU+35EBVQQqr7w=; b=fEZCz1n6Ef7eUWrLPitQHlUz2RYF6Z7EKhgykYASLjDvKWurqvXHUQgK+5CO2X+YJY Wk4LMEX0j3+uMtnHMQDO+wHjy8k9EEHLQHI3Tu5iYbDzkT+R9lBEGGhxsAidDLbSMTUb t3mF02x3Tku/9io1Q/OGQfaPpDqfeLnLL1JVbGQ8mz7OZqgCFIwlyci3dJ6V5lMZSdCh UCMgxSVPXGYLxAwU8YL4VE0ipL6UPf3tmPHQSjIptFHGjkvsMmHcd25ZSINlPhOxRKZF lpxuRG4Mxrt0iJevkQPHRqHY2mX0bVwxMaoMNIAckpH7n/Sn+Kuvoe40VLKfYjKI2mKB sE+g== X-Gm-Message-State: AJcUukdNRMqGKtn6K2njxgaYs4BCX1WhFhoaQVguFk+fkp6g5SGIPaZo Zx4TesU74I7DdaF0BBFBz+8pZRFlaRI= X-Google-Smtp-Source: ALg8bN7Emofugwo7k6F8fF+xILPrApPsp/o+UPt5KjhQs9GCeLJtl4fPWIX+XxnCMJhN2FoxMekngQ== X-Received: by 2002:a62:104a:: with SMTP id y71mr12622147pfi.34.1548457039443; Fri, 25 Jan 2019 14:57:19 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Date: Fri, 25 Jan 2019 14:57:09 -0800 Message-Id: <20190125225714.10234-3-richard.henderson@linaro.org> X-Mailer: git-send-email 2.17.2 In-Reply-To: <20190125225714.10234-1-richard.henderson@linaro.org> References: <20190125225714.10234-1-richard.henderson@linaro.org> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::443 Subject: [Qemu-devel] [PATCH] target/arm: Fix validation of 32-bit address spaces for aa32 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" When tsz =3D=3D 0, aarch32 selects the address space via exclusion, and there are no "top_bits" remaining that require validation. Fixes: ba97be9f4a4 Reported-by: Peter Maydell Signed-off-by: Richard Henderson --- target/arm/helper.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) diff --git a/target/arm/helper.c b/target/arm/helper.c index 92666e5208..e24689f767 100644 --- a/target/arm/helper.c +++ b/target/arm/helper.c @@ -10447,7 +10447,7 @@ static bool get_phys_addr_lpae(CPUARMState *env, ta= rget_ulong address, uint64_t ttbr; hwaddr descaddr, indexmask, indexmask_grainsize; uint32_t tableattrs; - target_ulong page_size, top_bits; + target_ulong page_size; uint32_t attrs; int32_t stride; int addrsize, inputsize; @@ -10487,12 +10487,19 @@ static bool get_phys_addr_lpae(CPUARMState *env, = target_ulong address, * We determined the region when collecting the parameters, but we * have not yet validated that the address is valid for the region. * Extract the top bits and verify that they all match select. + * + * For aa32, if inputsize =3D=3D addrsize, then we have selected the + * region by exclusion in aa32_va_parameters and there is no more + * validation to do here. */ - top_bits =3D sextract64(address, inputsize, addrsize - inputsize); - if (-top_bits !=3D param.select || (param.select && !ttbr1_valid)) { - /* In the gap between the two regions, this is a Translation fault= */ - fault_type =3D ARMFault_Translation; - goto do_fault; + if (inputsize < addrsize) { + target_ulong top_bits =3D sextract64(address, inputsize, + addrsize - inputsize); + if (-top_bits !=3D param.select || (param.select && !ttbr1_valid))= { + /* The gap between the two regions is a Translation fault */ + fault_type =3D ARMFault_Translation; + goto do_fault; + } } =20 if (param.using64k) { --=20 2.17.1