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=1794063843; b=qtWLhil3KCU6YsUZgFYNMKuui5hio/sE1kRzFV8NK8ir1rYKBOJ/nUJkjY3oanlp/N0H kWO7yJSZLNsmzz7n5FdNLNfkEuq4dHegAVFD/MB+cWpy0Lt+3KKXn2GkAGbFPr5tnw0RT IQiLzRXXxA/okAQU5mSllUfQXen0OhCwwMmmZvmpgCVIqPqbCTS3BLtEKscxwDPlTVX0r lORjX6YA+WiQsdQpZi2i3zDbs5pjs4P5o/iGokVf51ecJKodiLX4jXTvWDxaEbRoIpor1 32DTc1Z49p3hRIoZN6vg51Om85U1cQXbILVKdZHLJmOO5d8B7+StpI6Ytp52FHQrCdA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794063843; 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=rtJJKoSXqVzyH80zo8kZJLlI9CJWFbwjpNlgnkIlMVc=; b=t8xdAnzyslBFZ0dhusQOrxQsKYyWk/Y9wgibrwFHmcGfrRq+7bDN0KCdXyp7lYP2ekIJ KQuTpcppJNn81zztHHwzMz/ghU2yFE6qDBDm9j4SEDASkloeHkcQZnfl2laoQLYefFYcP 0rK5+HKrVWcXUbWGPoit688HFlF5MIV9anmy+aTqNqn9X/J5k/tm3S3Sh5zlEZrrV2/AB 4WexUeZwqRh0bJwzeTzv9bz7Ds/JZA0hwEqJBHkkjPr8U1Xg6rHQCykBmUoOs/dZqQBQq NvNoZ4Es98U683a39hqnXP6fRGvPssjeWfQPoes0OWF0Naq0hmqeq1zFST8U9UIaYyw== 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=qKG8Jpj9; 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 72A76606A9D4; Sat, 7 Nov 2026 15:04:03 +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=qKG8Jpj9 Received: by smtp.kernel.org (Postfix) with ESMTPSA id D9F701F008A5; Sat, 7 Nov 2026 15:04:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1794063843; bh=rtJJKoSXqVzyH80zo8kZJLlI9CJWFbwjpNlgnkIlMVc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=qKG8Jpj9ooovV6qvpF5xQ2hNgroHYB7r/qnSPBligst4HeRiL202sLYXrmGp+9t88 D/Owj8qV78NWSrMELkK5S2Od/rDAlwwyFxKJXGDrpjBb5Ow0aMfXkSWyK0O2ZGjyRt o6DqEI3990IfsIcQzp05nxXDQqMJHsLnpkbkIN6s= 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 7.3 0055/1257] memory: brcmstb_dpfe: Bounds check DCPU-supplied MSG_ARG_COUNT Date: Sat, 7 Nov 2026 08:39:11 -0500 Message-ID: <20261107134940.923987705@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261107134939.434104957@linuxfoundation.org> References: <20261107134939.434104957@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 7.3-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