From patchwork Mon Aug 10 13:24:35 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Helge Deller X-Patchwork-Id: 11707419 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C990413A4 for ; Mon, 10 Aug 2020 13:38:36 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A05CF206E9 for ; Mon, 10 Aug 2020 13:38:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=gmx.net header.i=@gmx.net header.b="HUHCKXgR" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A05CF206E9 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=gmx.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:58174 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1k580Z-0000e5-Mu for patchwork-qemu-devel@patchwork.kernel.org; Mon, 10 Aug 2020 09:38:35 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:46344) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1k57nf-00010w-FV for qemu-devel@nongnu.org; Mon, 10 Aug 2020 09:25:15 -0400 Received: from mout.gmx.net ([212.227.15.15]:59221) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1k57nd-0008Gp-BW for qemu-devel@nongnu.org; Mon, 10 Aug 2020 09:25:15 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1597065886; bh=yi/ZvGbDbrIWKgg46+4OlOrFcTrRqKN6hBd0HkJl3lk=; h=X-UI-Sender-Class:From:To:Cc:Subject:Date:In-Reply-To:References; b=HUHCKXgRdSa+imSJ3Lgh2FRZbmqaocN8r0oYQJY/NPT5Oko171yqWRno5qL7Q0dfA Qpgr5aqSTS6HEclHo2iJ3+OvA2lvm3aRJ5dh41sS+Fb070CKpL0V+xUCh9jKw2aE5i sU1pfFdpDBpZS5M84cJF1UU6FSsB/4pE3X2kbz8g= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from ls3530.fritz.box ([92.116.174.37]) by mail.gmx.com (mrgmx004 [212.227.17.190]) with ESMTPSA (Nemesis) id 1MJE6L-1kP7W12eiJ-00Khut; Mon, 10 Aug 2020 15:24:46 +0200 From: Helge Deller To: peter.maydell@linaro.org, qemu-devel@nongnu.org Subject: [PULL v2 06/12] hw/display/artist: Check offset in draw_line to avoid buffer over-run Date: Mon, 10 Aug 2020 15:24:35 +0200 Message-Id: <20200810132441.16551-7-deller@gmx.de> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20200810132441.16551-1-deller@gmx.de> References: <20200810132441.16551-1-deller@gmx.de> MIME-Version: 1.0 X-Provags-ID: V03:K1:3GKF/FZrMDQ70PKgV+veTcMUezCbI4C4/rIyut5g7/QAA7fuA86 IsJU2qyk4v7VhfCpuz5B/PDjQGBdMbb83Pv2wUNEnF6UIa6QJQIDQ64vA2EbrK1P3WNvpMC PTNTsYP9yUw6zsYsz3MaA5wUMT4c3IlylWz4U0NgPT8V7cb4DbzqMJir/c+tLslfek51gAg JgBdT1Uiw/M7bUUjdFxYQ== X-UI-Out-Filterresults: notjunk:1;V03:K0:3XUKvdk5Uwk=:3A9AFBPCiKIcNlgnriqTBF 66OSodLdw1m+lxQvgVE+yMBkSdc0/qfKUMzdG707xoNuWdg74DhnO/BEEyxPWjXtTOUU6/0pP 7UEVUDxfpF/9tp9hKLhO2JhYwjZEuzTVkcsPw/XvifGIIbivEuEr1p56rDlE1uHBiGpqLPUSd X3kMeoTan3301p2S1VxZUnPrGmB2z34ATYJo/JynJpFJOPaEncop9ww+35b4dzEQpsk7pgGU1 rwEqDXhs1C8Dfx/rDu2Ncpto/EGYUDBzoxfVXpZRhzRx4g2YZiwvg0ncKz9647UNBec+IAvoZ RhHTi9ZK1sA1sbpbCxq3snb1Ada7Ba7uGjJ/vS60cWSkndx7q3I+QKqpx7KRaQFAgTnTg05o5 dMQz4JYCo4uEoL3L71tsprzgoNSMg3IaOJBovF7Tl/PZQOhkOjOzQqflBVcNoUmnmWeeI+MFf u2y/mM+FVdNFGGaY4gaUeL44eGvJaM8OBDaFKOdgD6QyCJDrMyZ01b6lyz+yWv4aIujsZJgAW wISulUa81xToIfl9TDhT/VfUEpNeD7CPqx7h3uSpsgMgbNxT6JqH9EM9g71rwM6W73G3X9DJy hRJ3ij2t6OsXCaoyWDB+eAPZzpVWtkjEq+1lnHC28YgkFjd1odgyZv+IGIrDlvrxs7RnDdp2R vT9jeexohITma1cvCTFs75PJpT19RKGfHStrJ8LLCiBFo4Vm3Hpz7FWEs7ynyBlkNbm4wZj4v sF3TJKHSe1OV9wWiLoRc5mxznYkFv3LprhaUtL3P/51U7tft5sq7vE6z8f+cXkp90Bmw8K8z0 f3fSrbHm9ut6Gzlqk+xeTGXtinXnON3wLhsAjM87naE5ZLvtTv3xAJtfrIyw0pCxLBlFmZKl/ ZAq2peWwWuv4MhZZLhMg4nUh2Q5pX1n7/9lE8Q7mQh/q7/7d096oR5JuA7i1eLL0nn1tDi6HU EEnYa4C9/g81ePwLd//uApa+m4E7YyphRbMzpXyZ8yG04JjBiMd1pVBS2UesX/aRgli2vSsT2 jbNgPnWANqCfzwTCE8YkofR2bJ2f5YTFXLJFquSXeiMKBQcEjRwZKqO5KSFKVC1DqMTTFKLTw nZSoJJc3heYnZGcc6EHfaNxJRRcQSwdYTXwvPk0ZeJTdpRGzOF+qstsx2xzG24FMUzihg4uC7 angGz5dqft2lY5CoBSvIiwbogJjjjTpnkWrkBNL3uiaSEAW63JH5eCXBStU4+qwhlYFs2kvIj hp53nBg54M3EJbaKB Received-SPF: pass client-ip=212.227.15.15; envelope-from=deller@gmx.de; helo=mout.gmx.net X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/10 09:24:50 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] X-Spam_score_int: -35 X-Spam_score: -3.6 X-Spam_bar: --- X-Spam_report: (-3.6 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-1, 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: Helge Deller , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Richard Henderson Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" From: Philippe Mathieu-Daudé Invalid I/O writes can craft an offset out of the vram_buffer range. We avoid: Program terminated with signal SIGSEGV, Segmentation fault. 284 *dst &= ~plane_mask; (gdb) bt #0 0x000055d5dccdc5c0 in artist_rop8 (s=0x55d5defee510, dst=0x7f8e84ed8216 , val=0 '\000') at hw/display/artist.c:284 #1 0x000055d5dccdcf83 in fill_window (s=0x55d5defee510, startx=22, starty=5674, width=65, height=5697) at hw/display/artist.c:551 #2 0x000055d5dccddfb9 in artist_reg_write (opaque=0x55d5defee510, addr=1051140, val=4265537, size=4) at hw/display/artist.c:902 #3 0x000055d5dcb42a7c in memory_region_write_accessor (mr=0x55d5defeea10, addr=1051140, value=0x7ffe57db08c8, size=4, shift=0, mask=4294967295, attrs=...) at memory.c:483 Reported-by: LLVM libFuzzer Signed-off-by: Philippe Mathieu-Daudé Signed-off-by: Helge Deller --- hw/display/artist.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) -- 2.21.3 diff --git a/hw/display/artist.c b/hw/display/artist.c index de56200dbf..a206afe641 100644 --- a/hw/display/artist.c +++ b/hw/display/artist.c @@ -555,7 +555,7 @@ static void fill_window(ARTISTState *s, int startx, int starty, static void draw_line(ARTISTState *s, int x1, int y1, int x2, int y2, bool update_start, int skip_pix, int max_pix) { - struct vram_buffer *buf; + struct vram_buffer *buf = &s->vram_buffer[ARTIST_BUFFER_AP]; uint8_t color; int dx, dy, t, e, x, y, incy, diago, horiz; bool c1; @@ -563,6 +563,12 @@ static void draw_line(ARTISTState *s, int x1, int y1, int x2, int y2, trace_artist_draw_line(x1, y1, x2, y2); + if (x1 * y1 >= buf->size || x2 * y2 >= buf->size) { + qemu_log_mask(LOG_GUEST_ERROR, + "draw_line (%d,%d) (%d,%d)\n", x1, y1, x2, y2); + return; + } + if (update_start) { s->vram_start = (x2 << 16) | y2; } @@ -620,7 +626,6 @@ static void draw_line(ARTISTState *s, int x1, int y1, int x2, int y2, x = x1; y = y1; color = artist_get_color(s); - buf = &s->vram_buffer[ARTIST_BUFFER_AP]; do { if (c1) {