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[66.27.222.29]) by smtp.gmail.com with ESMTPSA id l2sm2906666pju.25.2021.02.03.11.00.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 03 Feb 2021 11:00:25 -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 :mime-version:content-transfer-encoding; bh=yAOD8rB2c9GoNvNcKMZwjdplIAr1RvdqOJ4SbnIjxU0=; b=XqG6wHWXj2zbXFyi07GXn8kljDPIB7SODWlzuojWV2tkEsNqUnOCNcwbv05skV0ORh kHLKA1xYnBBeDfFoNNkVW1iivJpGgHbUx6aD16A+17fw21y7/2QzMHN+iClSd2L/Ol+J c472h8YWr7GX7ishxIanPD8baEQ7JDUdIMenmBE94dZmAz1qRj4jAE2U+x46dzgK91Hx mAPUICY5Ydh4g/VLxBi6KV8zqdrJDK8rPX2QS830RBql4gvZS4Z8IVGioheYxDCk+ICl bQcizvgypCXD8WI9LI6rz87vT1z8ekCj2dgxTAYRuU2okPi1t+OabsqpiCDgbBackg9J Qoyg== 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:mime-version:content-transfer-encoding; bh=yAOD8rB2c9GoNvNcKMZwjdplIAr1RvdqOJ4SbnIjxU0=; b=tzEI3RKSGit48bxFcVoqDunWhodfV3L+9IIUjSk50rUgV5bpdWgt5aB4SAmcziebil zxZqZk/vWj1DWOvCVnc5C0oNDV8+mLL2n67m74etg6O5u3S3rMczR/J0l82/jjShLagf t7uRPd9AXjgRpIu44MOr9DasTuV9iyME1DcqatAoXbl7c/kMz4D4PbOoHXXLuGtznLrA FxJ/G47q4b7mUQMfn9vLUOT42rwtrpI2t5ODIbC4CPIodfJ/VhwposSbPwoayaIk4nS4 ToFTYHOIV00ka7iJewNQmmTCXFte1+YM1hKviriWcdbJ8HIlE3qa8fGnm5VjUKnoJV5o G0nw== X-Gm-Message-State: AOAM532wzkspbD7dQjMg6qJp5FdRY2mb3BdR7fAMKw41Tqi2YIpA87bo znLz6CL6BAHnqGEor3hviN6U/050SjS5euwP X-Google-Smtp-Source: ABdhPJwuJvYpenr2XkA045H7AFH9hrm85WdcAI4rL3GSCWMGmVRFztwYiqIReKnBbOong53V0Sag0Q== X-Received: by 2002:a17:90a:fe11:: with SMTP id ck17mr4401886pjb.152.1612378826771; Wed, 03 Feb 2021 11:00:26 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH v5 06/31] linux-user: Check for overflow in access_ok Date: Wed, 3 Feb 2021 08:59:45 -1000 Message-Id: <20210203190010.759771-7-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210203190010.759771-1-richard.henderson@linaro.org> References: <20210203190010.759771-1-richard.henderson@linaro.org> MIME-Version: 1.0 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=2607:f8b0:4864:20::102d; envelope-from=richard.henderson@linaro.org; helo=mail-pj1-x102d.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham 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@linaro.org, qemu-arm@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" Verify that addr + size - 1 does not wrap around. Reviewed-by: Peter Maydell Signed-off-by: Richard Henderson --- linux-user/qemu.h | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/linux-user/qemu.h b/linux-user/qemu.h index 17aa992165..441ba6a78b 100644 --- a/linux-user/qemu.h +++ b/linux-user/qemu.h @@ -491,12 +491,19 @@ extern unsigned long guest_stack_size; #define VERIFY_READ 0 #define VERIFY_WRITE 1 /* implies read access */ =20 -static inline int access_ok(int type, abi_ulong addr, abi_ulong size) +static inline bool access_ok(int type, abi_ulong addr, abi_ulong size) { - return guest_addr_valid(addr) && - (size =3D=3D 0 || guest_addr_valid(addr + size - 1)) && - page_check_range((target_ulong)addr, size, - (type =3D=3D VERIFY_READ) ? PAGE_READ : (PAGE_= READ | PAGE_WRITE)) =3D=3D 0; + if (!guest_addr_valid(addr)) { + return false; + } + if (size !=3D 0 && + (addr + size - 1 < addr || + !guest_addr_valid(addr + size - 1))) { + return false; + } + return page_check_range((target_ulong)addr, size, + (type =3D=3D VERIFY_READ) ? PAGE_READ : + (PAGE_READ | PAGE_WRITE)) =3D=3D 0; } =20 /* NOTE __get_user and __put_user use host pointers and don't check access. --=20 2.25.1