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[173.197.107.21]) by smtp.gmail.com with ESMTPSA id s13sm9521700pfd.99.2021.01.15.14.46.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Jan 2021 14:46:58 -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=rr4uhte3iLsKjX8Cbli6gBSl01cB/KM2FqNYctfYPe4=; b=ZwiPCxB+pgxqBSVhiKyzXLXxQL2ZxeJzOVekdmh0Png2yTdh5LHtbGJfe4xgh5KT5j MONKrUNjyAZIo/Q1APKbecM5C3a2XWQ9n1SkdQYEIAjD3by8a1EfLqIC78kqEvzPy2Iw X/eFDlBpD3YCYzZa19NwkpOOx/Y3yf+HWoCgmgKo2BTMP+Trc3cJb3vfouNGqfVOHF2Y J5j3S2NZgFFGIVUnvR5Mzy56uZgnFXNcA5fWhPpPP37Eb9xSnyHYOAKi9+o1+1smjgD0 z6HBA6xwvzedCCq9CzuCJnhO++Kf0zAKKG6opn1QJNchgzU6sBesjQK/wu7znGiPrZRK 7YOw== 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=rr4uhte3iLsKjX8Cbli6gBSl01cB/KM2FqNYctfYPe4=; b=fvocsuirMti1xAdwBkMBLcM61BeENGLSNeVZOIOjcOsSiWEtEqyYxO8jYhUEbwu78l E2qFSku8qxDAAXgugjDS2CCOYmdJW+tztxMSHQOng6Zw87ihn6qxMVw6JBK395Ha5g0V jBtvDNVRizfendt1Mja/Y/mo6HTrCSXtYUYa7mSRWhu3T9EKUaHAdm1UYDCRYePHrTy1 XJvnbveKvMT7iK5aez8mzB/dLEAw+Bzfc5EENWyo3qmv2Dw+hAQ1YMESt9pdDR5m+K2Z sr9qaiQLFHfk/VZHIdsKl7V/5i7japDm43ka539/3EgfZCXMhCCHsaDU5DXIe1YNLHv8 D3PA== X-Gm-Message-State: AOAM5336ioucxHpnVxox26ZmbXxl2jI609vOkfLjBaF3loccH5vSy4dp +4JsawQIcSguPqef4av2lBYl0+PJ2wleX7OD X-Google-Smtp-Source: ABdhPJxcsT7aNJHrEI9kefNnsvCzOZVgUW1giA0hGvYOCmrvP2zkMcewy7L+kS2jcSFk2KJJ6Kc8Cg== X-Received: by 2002:aa7:9706:0:b029:19d:a2c6:aeb with SMTP id a6-20020aa797060000b029019da2c60aebmr14865467pfg.36.1610750818505; Fri, 15 Jan 2021 14:46:58 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH v3 06/21] linux-user: Check for overflow in access_ok Date: Fri, 15 Jan 2021 12:46:30 -1000 Message-Id: <20210115224645.1196742-7-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210115224645.1196742-1-richard.henderson@linaro.org> References: <20210115224645.1196742-1-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::534; envelope-from=richard.henderson@linaro.org; helo=mail-pg1-x534.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 534753ca12..a0f670832e 100644 --- a/linux-user/qemu.h +++ b/linux-user/qemu.h @@ -489,12 +489,19 @@ 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