From patchwork Mon Aug 5 14:06:46 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bastien Nocera X-Patchwork-Id: 13753669 Received: from relay7-d.mail.gandi.net (relay7-d.mail.gandi.net [217.70.183.200]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9A5361384B3 for ; Mon, 5 Aug 2024 14:08:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.200 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722866927; cv=none; b=UlgF5mgmpHYGOoCBJwog3QUUGbglOCIsOEe36XGdPLt15rScgjyDZ+Tz4uh6wNLDo4ZHMhxSd/mRMSGOce0H1EjJFo/shAia2yFuK2XC0/4USD4HXSPd0Rp/nKuxsVTGW7fj41MkWTr6pGe3bjespaWakaBR+sYYIjtFZg2lIkQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722866927; c=relaxed/simple; bh=FGFSVpnOlly3osBhem6Z4w168jLm3SJlQEX2KRzVZwM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=KeORl5j/COK0yxZLbWfLpFKq0D8NoIIWdFCdMMT0dxtmPn4CN3z8ir6u7yAO3fdfNXBov2ZDtQ6YXZ2I8rAUjfNsvRtkZUpBiJIbEf+ViGFLdL+IIHjlFKP0eSXyLfZFKrURmh3PA7MNPuOhvoGxq6U3rtfrnRAUw07A4g6esRs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=hadess.net; spf=pass smtp.mailfrom=hadess.net; arc=none smtp.client-ip=217.70.183.200 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=hadess.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=hadess.net Received: by mail.gandi.net (Postfix) with ESMTPSA id CCB5D20010; Mon, 5 Aug 2024 14:08:43 +0000 (UTC) From: Bastien Nocera To: linux-bluetooth@vger.kernel.org Cc: Bastien Nocera Subject: [BlueZ 8/8] monitor: Check for possible integer underflow Date: Mon, 5 Aug 2024 16:06:46 +0200 Message-ID: <20240805140840.1606239-9-hadess@hadess.net> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240805140840.1606239-1-hadess@hadess.net> References: <20240805140840.1606239-1-hadess@hadess.net> Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-GND-Sasl: hadess@hadess.net Error: INTEGER_OVERFLOW (CWE-190): [#def4] [important] bluez-5.77/monitor/control.c:1094:2: tainted_data_return: Called function "recv(data->fd, data->buf + data->offset, 1490UL - data->offset, MSG_DONTWAIT)", and a possible return value may be less than zero. bluez-5.77/monitor/control.c:1094:2: assign: Assigning: "len" = "recv(data->fd, data->buf + data->offset, 1490UL - data->offset, MSG_DONTWAIT)". bluez-5.77/monitor/control.c:1099:2: overflow: The expression "data->offset" is considered to have possibly overflowed. bluez-5.77/monitor/control.c:1115:3: overflow: The expression "data->offset -= pktlen + 6" is deemed overflowed because at least one of its arguments has overflowed. bluez-5.77/monitor/control.c:1118:4: overflow_sink: "data->offset", which might have underflowed, is passed to "memmove(data->buf, data->buf + 6 + pktlen, data->offset)". [Note: The source code implementation of the function has been overridden by a builtin model.] 1116| 1117| if (data->offset > 0) 1118|-> memmove(data->buf, data->buf + MGMT_HDR_SIZE + pktlen, 1119| data->offset); 1120| } --- monitor/control.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/monitor/control.c b/monitor/control.c index 009cf15209f0..62857b4b84de 100644 --- a/monitor/control.c +++ b/monitor/control.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include #include @@ -1091,9 +1092,14 @@ static void client_callback(int fd, uint32_t events, void *user_data) return; } + if (sizeof(data->buf) <= data->offset) + return; + len = recv(data->fd, data->buf + data->offset, sizeof(data->buf) - data->offset, MSG_DONTWAIT); - if (len < 0) + if (len < 0 || + len > UINT16_MAX || + UINT16_MAX - data->offset > len) return; data->offset += len;