From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794062737; b=3OPdzKxU+n6AskMMITRzSswo1KN4mIqY3JDzRxO1k/6jpadJ/FanxnEZ5TcqXi20dMF3 jBaU2RxvoX+tCKoiZtbzYYmaxuQK32eWdj/7/GgNj1FKNmtvoClM2ATBKHcGZUeY//7eL WWoTO5On9VNr2S/D0WKmR9OsN/9MQWOqDzvX8sPASXuAEddziOOrC2SgxGU6zjybxXmEn bktKQr1P4s16cgnSX2I/ZTH8fyR3X1qw8qAhditNH4projq9XLZxpn2a3Lt4q9zeoOnru biWQGpEoLmqV27NQB5qLcCYkdNZ/ACzlSfUvmcijy+0kdYYidm+qXRStta7q9UajGyA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794062737; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=zCoebUK0C2dIrMo8jcGoruUKoJ9KawvuS2u5uvp48yU=; b=HiTRFLGxxOsIjdnViE59pOcfS0A4tN9jaf2gMeILfRKw2sWjlwwRmu1Y4hWh2daohVbg uM4BaPsTbDOLEgRaGvcKYBZz0KEw6XRSLwznE/9CAKaXDRYYlAHAYgIfRV4gnzY+/A5f0 fUrdm2YAin8l1vkm1ttT3cCrZ4SlFZc2ZwOYjNcsMo3S9TcYJR6Y9dQsI8Xj9Zmc9Pd6n SZtLF3KKRAY0iJzUJw6X7oPap1IyGg4767B1tx16PH6QJotFKMdgPZjVbrKX7hwqN452U nWZ8Ft8okZ4yGUs9pB9zEa35mPLfJHdRd3fPuJKYSijEId5oG0vXP1y/xGn/cx/bR5w== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=SokouDpp; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CF9E7606A32E; Sat, 7 Nov 2026 14:45:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=SokouDpp Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7BA3D1F0089F; Sat, 7 Nov 2026 14:45:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1794062736; bh=zCoebUK0C2dIrMo8jcGoruUKoJ9KawvuS2u5uvp48yU=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=SokouDppBK5mD8bnDXB1011LP3YMcg2OWRtesIg/zz4gNMGVo4gRXPtUNLCeOeiCa +HHZ9ujAn+zq8ozwhyUJhZ4ytUyAs+r5vWaX5wNQ/fRZReU3vYwtOeASrKSdSAdiWU 4+7OeT7wm9J5wqUtjYLwDImfV+wttT8C98j9CYbM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Justin Chen , Danesh Petigara , Florian Fainelli , Krzysztof Kozlowski , Sasha Levin Subject: [PATCH 6.18 054/869] memory: brcmstb_dpfe: Bounds check DCPU-supplied MSG_ARG_COUNT Date: Sat, 7 Nov 2026 08:45:36 -0500 Message-ID: <20261107134853.912075422@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261107134852.069646174@linuxfoundation.org> References: <20261107134852.069646174@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Justin Chen [ Upstream commit 6b07f8c06caca015a0db69e3f323b5186469bc66 ] A compromised or buggy DCPU coprocessor can make any user who reads world-readable /sys/devices/.../dpfe_info|dpfe_dram trigger a kernel stack out-of-bounds read of arbitrary extent. This bounds checks chksum_idx against MSG_FIELD_MAX after reading the response from DCPU message RAM. Fixes: 5d06f53d9509 ("memory: brcmstb: dpfe: Compute checksum at __send_command() time") Cc: stable@vger.kernel.org Signed-off-by: Justin Chen Assisted-by: Gemini:gemini-3.1-pro-preview cursor Signed-off-by: Danesh Petigara Reviewed-by: Florian Fainelli Link: https://patch.msgid.link/20260826201500.3000125-3-danesh.petigara@broadcom.com Signed-off-by: Krzysztof Kozlowski Signed-off-by: Sasha Levin --- drivers/memory/brcmstb_dpfe.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/memory/brcmstb_dpfe.c b/drivers/memory/brcmstb_dpfe.c index 66343205f585b..7b02c36c7fca7 100644 --- a/drivers/memory/brcmstb_dpfe.c +++ b/drivers/memory/brcmstb_dpfe.c @@ -503,6 +503,8 @@ static int __send_command(struct brcmstb_dpfe_priv *priv, unsigned int cmd, for (i = 0; i < MSG_FIELD_MAX; i++) result[i] = readl_relaxed(regs + DCPU_MSG_RAM(i)); chksum_idx = result[MSG_ARG_COUNT] + MSG_ARG_COUNT + 1; + if (chksum_idx >= MSG_FIELD_MAX) + ret = -EINVAL; } /* Tell DCPU we are done */ -- 2.53.0