From patchwork Thu Apr 18 07:18:21 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tyler Hicks X-Patchwork-Id: 1087427 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=lists.ubuntu.com (client-ip=91.189.94.19; helo=huckleberry.canonical.com; envelope-from=kernel-team-bounces@lists.ubuntu.com; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=canonical.com Received: from huckleberry.canonical.com (huckleberry.canonical.com [91.189.94.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 44l9Sk26VBz9s4Y; Thu, 18 Apr 2019 17:18:46 +1000 (AEST) Received: from localhost ([127.0.0.1] helo=huckleberry.canonical.com) by huckleberry.canonical.com with esmtp (Exim 4.86_2) (envelope-from ) id 1hH1Jh-0003ZV-0s; Thu, 18 Apr 2019 07:18:41 +0000 Received: from youngberry.canonical.com ([91.189.89.112]) by huckleberry.canonical.com with esmtps (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:128) (Exim 4.86_2) (envelope-from ) id 1hH1Jf-0003Z1-7g for kernel-team@lists.ubuntu.com; Thu, 18 Apr 2019 07:18:39 +0000 Received: from 2.general.tyhicks.us.vpn ([10.172.64.53] helo=sec.ubuntu-ci) by youngberry.canonical.com with esmtpsa (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.76) (envelope-from ) id 1hH1Je-0001Ei-Mm; Thu, 18 Apr 2019 07:18:38 +0000 From: Tyler Hicks To: kernel-team@lists.ubuntu.com Subject: [PATCH 1/2] brcmfmac: add subtype check for event handling in data path Date: Thu, 18 Apr 2019 07:18:21 +0000 Message-Id: <1555571902-7650-2-git-send-email-tyhicks@canonical.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1555571902-7650-1-git-send-email-tyhicks@canonical.com> References: <1555571902-7650-1-git-send-email-tyhicks@canonical.com> X-BeenThere: kernel-team@lists.ubuntu.com X-Mailman-Version: 2.1.20 Precedence: list List-Id: Kernel team discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: kernel-team-bounces@lists.ubuntu.com Sender: "kernel-team" From: Arend van Spriel For USB there is no separate channel being used to pass events from firmware to the host driver and as such are passed over the data path. In order to detect mock event messages an additional check is needed on event subtype. This check is added conditionally using unlikely() keyword. Reviewed-by: Hante Meuleman Reviewed-by: Pieter-Paul Giesberts Reviewed-by: Franky Lin Signed-off-by: Arend van Spriel Signed-off-by: Kalle Valo CVE-2019-9503 (cherry picked from commit a4176ec356c73a46c07c181c6d04039fafa34a9f) Signed-off-by: Tyler Hicks --- drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c | 5 +++-- drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.h | 16 ++++++++++++---- .../net/wireless/broadcom/brcm80211/brcmfmac/msgbuf.c | 2 +- 3 files changed, 16 insertions(+), 7 deletions(-) diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c index 860a4372cb56..09c5f67f4089 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c @@ -464,7 +464,8 @@ void brcmf_rx_frame(struct device *dev, struct sk_buff *skb, bool handle_event) } else { /* Process special event packets */ if (handle_event) - brcmf_fweh_process_skb(ifp->drvr, skb); + brcmf_fweh_process_skb(ifp->drvr, skb, + BCMILCP_SUBTYPE_VENDOR_LONG); brcmf_netif_rx(ifp, skb); } @@ -481,7 +482,7 @@ void brcmf_rx_event(struct device *dev, struct sk_buff *skb) if (brcmf_rx_hdrpull(drvr, skb, &ifp)) return; - brcmf_fweh_process_skb(ifp->drvr, skb); + brcmf_fweh_process_skb(ifp->drvr, skb, 0); brcmu_pkt_buf_free_skb(skb); } diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.h index 816f80ea925b..ebd66fe0d949 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.h +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.h @@ -211,7 +211,7 @@ enum brcmf_fweh_event_code { */ #define BRCM_OUI "\x00\x10\x18" #define BCMILCP_BCM_SUBTYPE_EVENT 1 - +#define BCMILCP_SUBTYPE_VENDOR_LONG 32769 /** * struct brcm_ethhdr - broadcom specific ether header. @@ -334,10 +334,10 @@ void brcmf_fweh_process_event(struct brcmf_pub *drvr, void brcmf_fweh_p2pdev_setup(struct brcmf_if *ifp, bool ongoing); static inline void brcmf_fweh_process_skb(struct brcmf_pub *drvr, - struct sk_buff *skb) + struct sk_buff *skb, u16 stype) { struct brcmf_event *event_packet; - u16 usr_stype; + u16 subtype, usr_stype; /* only process events when protocol matches */ if (skb->protocol != cpu_to_be16(ETH_P_LINK_CTL)) @@ -346,8 +346,16 @@ static inline void brcmf_fweh_process_skb(struct brcmf_pub *drvr, if ((skb->len + ETH_HLEN) < sizeof(*event_packet)) return; - /* check for BRCM oui match */ event_packet = (struct brcmf_event *)skb_mac_header(skb); + + /* check subtype if needed */ + if (unlikely(stype)) { + subtype = get_unaligned_be16(&event_packet->hdr.subtype); + if (subtype != stype) + return; + } + + /* check for BRCM oui match */ if (memcmp(BRCM_OUI, &event_packet->hdr.oui[0], sizeof(event_packet->hdr.oui))) return; diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/msgbuf.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/msgbuf.c index 4e8397a0cbc8..ee922b052561 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/msgbuf.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/msgbuf.c @@ -1116,7 +1116,7 @@ static void brcmf_msgbuf_process_event(struct brcmf_msgbuf *msgbuf, void *buf) skb->protocol = eth_type_trans(skb, ifp->ndev); - brcmf_fweh_process_skb(ifp->drvr, skb); + brcmf_fweh_process_skb(ifp->drvr, skb, 0); exit: brcmu_pkt_buf_free_skb(skb);