From nobody Sun Nov 24 06:54:31 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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 1725605800834698.9929674425852; Thu, 5 Sep 2024 23:56:40 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1smSsy-00014y-LW; Fri, 06 Sep 2024 02:56:00 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1smSsv-0000aY-Dk; Fri, 06 Sep 2024 02:55:57 -0400 Received: from isrv.corpit.ru ([86.62.121.231]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1smSst-0003Lt-AZ; Fri, 06 Sep 2024 02:55:56 -0400 Received: from tsrv.corpit.ru (tsrv.tls.msk.ru [192.168.177.2]) by isrv.corpit.ru (Postfix) with ESMTP id E81168C248; Fri, 6 Sep 2024 09:53:12 +0300 (MSK) Received: from tls.msk.ru (mjt.wg.tls.msk.ru [192.168.177.130]) by tsrv.corpit.ru (Postfix) with SMTP id A6424133400; Fri, 6 Sep 2024 09:54:30 +0300 (MSK) Received: (nullmailer pid 43447 invoked by uid 1000); Fri, 06 Sep 2024 06:54:29 -0000 From: Michael Tokarev To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org, Peter Maydell , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Michael Tokarev Subject: [Stable-8.2.7 19/53] hw/misc/bcm2835_property: Fix handling of FRAMEBUFFER_SET_PALETTE Date: Fri, 6 Sep 2024 09:53:49 +0300 Message-Id: <20240906065429.42415-19-mjt@tls.msk.ru> X-Mailer: git-send-email 2.39.2 In-Reply-To: References: MIME-Version: 1.0 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=86.62.121.231; envelope-from=mjt@tls.msk.ru; helo=isrv.corpit.ru X-Spam_score_int: -68 X-Spam_score: -6.9 X-Spam_bar: ------ X-Spam_report: (-6.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_HI=-5, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZM-MESSAGEID: 1725605801528116600 From: Peter Maydell The documentation of the "Set palette" mailbox property at https://github.com/raspberrypi/firmware/wiki/Mailbox-property-interface#set= -palette says it has the form: Length: 24..1032 Value: u32: offset: first palette index to set (0-255) u32: length: number of palette entries to set (1-256) u32...: RGBA palette values (offset to offset+length-1) We get this wrong in a couple of ways: * we aren't checking the offset and length are in range, so the guest can make us spin for a long time by providing a large length * the bounds check on our loop is wrong: we should iterate through 'length' palette entries, not 'length - offset' entries Fix the loop to implement the bounds checks and get the loop condition right. In the process, make the variables local to this switch case, rather than function-global, so it's clearer what type they are when reading the code. Cc: qemu-stable@nongnu.org Signed-off-by: Peter Maydell Reviewed-by: Philippe Mathieu-Daud=C3=A9 Message-id: 20240723131029.1159908-2-peter.maydell@linaro.org (cherry picked from commit 0892fffc2abaadfb5d8b79bb0250ae1794862560) Signed-off-by: Michael Tokarev (Mjt: context fix due to lack of v9.0.0-1812-g5d5f1b60916a "hw/misc: Implement mailbox properties for custo= mer OTP and device specific private keys" also remove now-unused local `n' variable which gets removed in the next c= hange in this file, v9.0.0-2720-g32f1c201eedf "hw/misc/bcm2835_property: Avoid overflow in OTP= access properties") diff --git a/hw/misc/bcm2835_property.c b/hw/misc/bcm2835_property.c index ff55a4e2cd..87876f9a58 100644 --- a/hw/misc/bcm2835_property.c +++ b/hw/misc/bcm2835_property.c @@ -28,8 +28,6 @@ static void bcm2835_property_mbox_push(BCM2835PropertySta= te *s, uint32_t value) uint32_t tot_len; size_t resplen; uint32_t tmp; - int n; - uint32_t offset, length, color; =20 /* * Copy the current state of the framebuffer config; we will update @@ -264,18 +262,25 @@ static void bcm2835_property_mbox_push(BCM2835Propert= yState *s, uint32_t value) resplen =3D 16; break; case RPI_FWREQ_FRAMEBUFFER_SET_PALETTE: - offset =3D ldl_le_phys(&s->dma_as, value + 12); - length =3D ldl_le_phys(&s->dma_as, value + 16); - n =3D 0; - while (n < length - offset) { - color =3D ldl_le_phys(&s->dma_as, value + 20 + (n << 2)); - stl_le_phys(&s->dma_as, - s->fbdev->vcram_base + ((offset + n) << 2), co= lor); - n++; + { + uint32_t offset =3D ldl_le_phys(&s->dma_as, value + 12); + uint32_t length =3D ldl_le_phys(&s->dma_as, value + 16); + int resp; + + if (offset > 255 || length < 1 || length > 256) { + resp =3D 1; /* invalid request */ + } else { + for (uint32_t e =3D 0; e < length; e++) { + uint32_t color =3D ldl_le_phys(&s->dma_as, value + 20 = + (e << 2)); + stl_le_phys(&s->dma_as, + s->fbdev->vcram_base + ((offset + e) << 2)= , color); + } + resp =3D 0; } - stl_le_phys(&s->dma_as, value + 12, 0); + stl_le_phys(&s->dma_as, value + 12, resp); resplen =3D 4; break; + } case RPI_FWREQ_FRAMEBUFFER_GET_NUM_DISPLAYS: stl_le_phys(&s->dma_as, value + 12, 1); resplen =3D 4; --=20 2.39.2