From patchwork Wed Mar 1 20:47:07 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Petr Oros X-Patchwork-Id: 13156493 X-Patchwork-Delegate: kuba@kernel.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BD49AC7EE23 for ; Wed, 1 Mar 2023 20:47:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229563AbjCAUr4 (ORCPT ); Wed, 1 Mar 2023 15:47:56 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53882 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229758AbjCAUrz (ORCPT ); Wed, 1 Mar 2023 15:47:55 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DE991498A1 for ; Wed, 1 Mar 2023 12:47:12 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1677703632; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=2il8EePBRc7AgflT4XHq9yy6CUWbrrE2NEZTXgGKJCU=; b=WkMoNP3GlcwYTn8CXasnUrZ9NzCof+/JBCYF76AI54kppthNlDYWBNJb9Uuj2ciJ5Qiu+T YdvadTg7x2Tmi2986eG/skl1Vqsxq3+LV3FV6FCDyJA8CJULjQLkH4fLS2yFQsn3ux60Ii 1GlJni3AAGurV9ewEVwXEe0NCpfljUo= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-578-iXqunm27Mj-9JXP5nSkxuA-1; Wed, 01 Mar 2023 15:47:10 -0500 X-MC-Unique: iXqunm27Mj-9JXP5nSkxuA-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 2F525100F90B; Wed, 1 Mar 2023 20:47:10 +0000 (UTC) Received: from swamp.redhat.com (unknown [10.39.192.177]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4BD8F140EBF4; Wed, 1 Mar 2023 20:47:08 +0000 (UTC) From: Petr Oros To: netdev@vger.kernel.org Cc: aleksander.lobakin@intel.com, jesse.brandeburg@intel.com, anthony.l.nguyen@intel.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, scott.w.taylor@intel.com, intel-wired-lan@lists.osuosl.org, linux-kernel@vger.kernel.org Subject: [PATCH net v3] ice: copy last block omitted in ice_get_module_eeprom() Date: Wed, 1 Mar 2023 21:47:07 +0100 Message-Id: <20230301204707.2592337-1-poros@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.7 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org ice_get_module_eeprom() is broken since commit e9c9692c8a81 ("ice: Reimplement module reads used by ethtool") In this refactor, ice_get_module_eeprom() reads the eeprom in blocks of size 8. But the condition that should protect the buffer overflow ignores the last block. The last block always contains zeros. Bug uncovered by ethtool upstream commit 9538f384b535 ("netlink: eeprom: Defer page requests to individual parsers") After this commit, ethtool reads a block with length = 1; to read the SFF-8024 identifier value. unpatched driver: $ ethtool -m enp65s0f0np0 offset 0x90 length 8 Offset Values ------ ------ 0x0090: 00 00 00 00 00 00 00 00 $ ethtool -m enp65s0f0np0 offset 0x90 length 12 Offset Values ------ ------ 0x0090: 00 00 01 a0 4d 65 6c 6c 00 00 00 00 $ $ ethtool -m enp65s0f0np0 Offset Values ------ ------ 0x0000: 11 06 06 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0060: 00 00 00 00 00 00 00 00 00 00 00 00 00 01 08 00 0x0070: 00 10 00 00 00 00 00 00 00 00 00 00 00 00 00 00 patched driver: $ ethtool -m enp65s0f0np0 offset 0x90 length 8 Offset Values ------ ------ 0x0090: 00 00 01 a0 4d 65 6c 6c $ ethtool -m enp65s0f0np0 offset 0x90 length 12 Offset Values ------ ------ 0x0090: 00 00 01 a0 4d 65 6c 6c 61 6e 6f 78 $ ethtool -m enp65s0f0np0 Identifier : 0x11 (QSFP28) Extended identifier : 0x00 Extended identifier description : 1.5W max. Power consumption Extended identifier description : No CDR in TX, No CDR in RX Extended identifier description : High Power Class (> 3.5 W) not enabled Connector : 0x23 (No separable connector) Transceiver codes : 0x88 0x00 0x00 0x00 0x00 0x00 0x00 0x00 Transceiver type : 40G Ethernet: 40G Base-CR4 Transceiver type : 25G Ethernet: 25G Base-CR CA-N Encoding : 0x05 (64B/66B) BR, Nominal : 25500Mbps Rate identifier : 0x00 Length (SMF,km) : 0km Length (OM3 50um) : 0m Length (OM2 50um) : 0m Length (OM1 62.5um) : 0m Length (Copper or Active cable) : 1m Transmitter technology : 0xa0 (Copper cable unequalized) Attenuation at 2.5GHz : 4db Attenuation at 5.0GHz : 5db Attenuation at 7.0GHz : 7db Attenuation at 12.9GHz : 10db ........ .... Fixes: e9c9692c8a81 ("ice: Reimplement module reads used by ethtool") Signed-off-by: Petr Oros Reviewed-by: Jesse Brandeburg Tested-by: Jesse Brandeburg Reviewed-by: Alexander Lobakin --- v2: memcpy unified calls v3: copy_len is now declared in if scope unwrapped line before memcpy --- --- drivers/net/ethernet/intel/ice/ice_ethtool.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/intel/ice/ice_ethtool.c b/drivers/net/ethernet/intel/ice/ice_ethtool.c index b360bd8f15998b..f86e814354a311 100644 --- a/drivers/net/ethernet/intel/ice/ice_ethtool.c +++ b/drivers/net/ethernet/intel/ice/ice_ethtool.c @@ -4331,6 +4331,8 @@ ice_get_module_eeprom(struct net_device *netdev, * SFP modules only ever use page 0. */ if (page == 0 || !(data[0x2] & 0x4)) { + u32 copy_len; + /* If i2c bus is busy due to slow page change or * link management access, call can fail. This is normal. * So we retry this a few times. @@ -4354,8 +4356,8 @@ ice_get_module_eeprom(struct net_device *netdev, } /* Make sure we have enough room for the new block */ - if ((i + SFF_READ_BLOCK_SIZE) < ee->len) - memcpy(data + i, value, SFF_READ_BLOCK_SIZE); + copy_len = min_t(u32, SFF_READ_BLOCK_SIZE, ee->len - i); + memcpy(data + i, value, copy_len); } } return 0;