From nobody Tue Feb 10 02:55:44 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org ARC-Seal: i=1; a=rsa-sha256; t=1590261381; cv=none; d=zohomail.com; s=zohoarc; b=ApxamXD4TzB8KymzJVY2mOVkE7w8OdaqtSjwrKpU3BaQfRSYn3/S4NrZWlbNdR01HPxqsPkbKv+b2TX6KXmTPhn0R42K/qTPitK3QvzXW+aKv3QqhfNq17lXFlbSo6gJGyrNVNDLs4gMrWmEMDTCpx4f1hSGhGXAy7jWdX2SHAw= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1590261381; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=3/P/RORFvG7UdbIPFf45C1Qd+GHf2aIOo5B6nteH460=; b=UaOq11szlCIMWZgvuCk2VIVfhWg9T/XC8CnukcrpHPa4yH6vqyvo9v3EaqNsF/KvuOlg9nTFshP6gPdlcTA8tfIclnF86pQLHRJvPQmquAVYBtrLc6v3dip6E1aGmnQEpauw6deCGDc5KeIbDky4RU5O36p73SQZasa7vPN4fP4= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1590261381373564.29865104351; Sat, 23 May 2020 12:16:21 -0700 (PDT) Received: from localhost ([::1]:43442 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jcZd6-0008D6-1d for importer@patchew.org; Sat, 23 May 2020 15:16:20 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:55120) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jcZcE-0006pm-7O for qemu-devel@nongnu.org; Sat, 23 May 2020 15:15:26 -0400 Received: from mail-wr1-x441.google.com ([2a00:1450:4864:20::441]:40069) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jcZcD-0000ac-HV for qemu-devel@nongnu.org; Sat, 23 May 2020 15:15:25 -0400 Received: by mail-wr1-x441.google.com with SMTP id j16so1110264wrb.7 for ; Sat, 23 May 2020 12:15:25 -0700 (PDT) Received: from localhost.localdomain (17.red-88-21-202.staticip.rima-tde.net. [88.21.202.17]) by smtp.gmail.com with ESMTPSA id y185sm13370681wmy.11.2020.05.23.12.15.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 23 May 2020 12:15:23 -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=3/P/RORFvG7UdbIPFf45C1Qd+GHf2aIOo5B6nteH460=; b=SoXg+N7DAPMypoBC0pnAmDlZpaQrNZB1Ouxv8y/HYodRu9HyaAc6ersGG04ww27FxQ DeDMDtFy1eTZuNJ79VnoyymBFa0GpvI4TSdAC9HO6RIousuYwq8/ghc0TpcJMzzSYh4n Wb/+ErcX/3eIrEeRtgjgq0mtOyOCkY11ph8L/ZF/80eeRVmiVvof4xv29Ju+/p5iT8RO j+1Tbe0XhXuibH1eeKVM/qwnf32colP4DPSiA94j1+OjXqEg107jtS7bj1Yr+PakqGtg viJCWFcocxD4v0tKjHACTirNJflHwZ3Vr0cPmH9Wnm0dxbkEabjz0j2f91nSbda99UtI ifTw== 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=3/P/RORFvG7UdbIPFf45C1Qd+GHf2aIOo5B6nteH460=; b=BA2uPTjLpswfq8hh49WfSE3HZBLKg3ZRzhEI/cqGQIQ/smXbBxUYzxYfe+Mr6p4bI0 vH8OhBzUYiq7HRn1y3bIPpIUF+LnTQfq/pnmKn6HeYJ4qEcP/YBvfj1OMespBnnwWvi7 /fYCyjmXWZjD8b75vMVP8NMa/3GrAsruIq5ATNkEJtdPZW26qNqtd5iVIKtGJLZaKZyO 0Nxjvqs9uJMX5Ks4lcYiuG4619vmsGFV0iMOhBt+FOA6HAbsd8Gc87x7a4HfiNx1tg+E 8WOr64yrOwqQIQ32/dFcImUx2BsCC5UhBTXzWUhdtlNELbgj5pahHvC8H49wh+pPXObh 1MvQ== X-Gm-Message-State: AOAM530Os9Zl94elBqd0hLly/6vT9QivU6MCcQBN1dPNvaUJidQk1Hak r5ZZIDQhvXMImksOHzmncDU= X-Google-Smtp-Source: ABdhPJx88ks8u8aGQCwmP/F6yHx0VR5LfBXmdnGI4ewYtoxCh8rWoqvDmaxGJS8wpt3T5uUjvyQHXQ== X-Received: by 2002:a5d:62c2:: with SMTP id o2mr8033540wrv.51.1590261324195; Sat, 23 May 2020 12:15:24 -0700 (PDT) From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= To: Helge Deller , qemu-devel@nongnu.org, Richard Henderson , Sven Schnelle Subject: [PATCH 3/3] hw/display/artist: Check offset in block_move to avoid buffer over-read Date: Sat, 23 May 2020 21:15:17 +0200 Message-Id: <20200523191517.23684-4-f4bug@amsat.org> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20200523191517.23684-1-f4bug@amsat.org> References: <20200523191517.23684-1-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::441; envelope-from=philippe.mathieu.daude@gmail.com; helo=mail-wr1-x441.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: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.001, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN 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: Alexander Bulekov , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Invalid I/O writes can craft an offset out of the vram_buffer range. We avoid: Program terminated with signal SIGSEGV, Segmentation fault. 519 artist_rop8(s, buf, dst + column, buf->data[src + col= umn]); (gdb) bt #0 0x000055fa83b05e0a in block_move (s=3D0x55fa8647e510, source_x=3D0, s= ource_y=3D0, dest_x=3D255, dest_y=3D-5, width=3D22, height=3D16705) at hw/d= isplay/artist.c:519 #1 0x000055fa83b071da in artist_reg_write (opaque=3D0x55fa8647e510, addr= =3D1051392, val=3D16777211, size=3D4) at hw/display/artist.c:954 Reported-by: LLVM libFuzzer Signed-off-by: Philippe Mathieu-Daud=C3=A9 --- hw/display/artist.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/hw/display/artist.c b/hw/display/artist.c index 6f61b85a24..320e3c5050 100644 --- a/hw/display/artist.c +++ b/hw/display/artist.c @@ -513,6 +513,11 @@ static void block_move(ARTISTState *s, int source_x, i= nt source_y, int dest_x, dst =3D dest_x + ((line + dest_y) * buf->width); =20 for (column =3D startcolumn; column !=3D endcolumn; column +=3D co= lumnincr) { + if ((int)src + column < 0 || src + column >=3D buf->size) { + qemu_log_mask(LOG_GUEST_ERROR, + "block_move src:%d column:%d\n", src, column= ); + continue; /* FIXME */ + } if (dst + column > buf->size || src + column > buf->size) { continue; } --=20 2.21.3