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[174.21.150.71]) by smtp.gmail.com with ESMTPSA id me3sm164189pjb.32.2021.02.09.16.02.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Feb 2021 16:02:32 -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=xzvsbmpHnqExAvvspw2vZltKkMn0UiHvydl6tbDwLu6HvTy2tc0Evv+eTOeX70SEpr cT7FxwdegNyWWGvKX37O+CgqsDJy1Dfhv9lrD/sOw3Mc5DWdQJchcvJq7Rt976ZyoxIy tcVnOzQnA+pYxFz/MYLbPbkuPt09ibuBg7RsG7pZobOCUWWZhb0FTaCZoVLLUE/4GYHs ISAAWGIina0Vkx/Jvq/K5Vap01ZjWznhCuQiTOzxdXn8VO2OGTGfrUlszsAIOt4ikmVx +PRLHCAc8b6yLV52QBpC450Q+XBICW08hpdLhGT+lM7+4JAp8HPAmwuetDQNK/vWuajB ckkg== 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=ow9VbxRKv3yzjRvgyY1uRPlDRhT550LcJ5GOctqwZ84+U7n8R9/JioEIZy1Xc0WZot UGS99nuyMyVfRfHwL6LisJfSmu3dhcIXEtzSf5eRS75BNQ84anyH3G/PSxB904+lkXDV ifRfM/kr4VDDdcAFfIqrpYadkuSZV2DY/WJnz92CoHer+uHlsnYGRwUxYDREJ7BWTRU3 Jcf9uJragj9pXSA34sTjwYyXEUsE56MI9Fmbw7/1awekFBytWKiQfRmIX9a7LXWpTdjS ma2cTrDB0r7SMEJ9adAQ1SEohz77ySdMFStP9LM8CVMsXf5YcgrJv/85GNDlgio40VvN bPOA== X-Gm-Message-State: AOAM531XTAQYXFqOR2tTSDSm6hJ92VeMTOwC4H2jaMbZ5N1Yk881lBU/ NotcmDxF1qeEcpaHl4WwlNegoalRUBczxg== X-Google-Smtp-Source: ABdhPJwKoYXD4Q+CbzELXa1j2V9fzoNopg/wECEBTSlsL1lAeXv9+Q3Gu0e8evz64ZpzHTm0VELPtA== X-Received: by 2002:a17:90b:350b:: with SMTP id ls11mr372200pjb.166.1612915353260; Tue, 09 Feb 2021 16:02:33 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH v6 06/31] linux-user: Check for overflow in access_ok Date: Tue, 9 Feb 2021 16:01:58 -0800 Message-Id: <20210210000223.884088-7-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210210000223.884088-1-richard.henderson@linaro.org> References: <20210210000223.884088-1-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::102e; envelope-from=richard.henderson@linaro.org; helo=mail-pj1-x102e.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 Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @linaro.org) 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