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[2620:137:e000::1:20]) by mx.google.com with ESMTP id l190-20020a6388c7000000b0053b8f80c63dsi6738885pgd.734.2023.05.27.08.13.08; Sat, 27 May 2023 08:13:24 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=fail header.i=@auristor.com header.s=MDaemon header.b=YwgGB3eT; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=auristor.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232782AbjE0PIW (ORCPT + 99 others); Sat, 27 May 2023 11:08:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41242 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232746AbjE0PIU (ORCPT ); Sat, 27 May 2023 11:08:20 -0400 Received: from sequoia-grove.ad.secure-endpoints.com (sequoia-grove.ad.secure-endpoints.com [IPv6:2001:470:1f07:f77:70f5:c082:a96a:5685]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 432F5EB for ; Sat, 27 May 2023 08:08:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/relaxed; d=auristor.com; s=MDaemon; r=y; t=1685200098; x=1685804898; i=jaltman@auristor.com; q=dns/txt; h=Message-ID:Date: MIME-Version:User-Agent:From:Subject:To:Cc:References: Content-Language:Organization:In-Reply-To:Content-Type; bh=+vI3b zalYhKXw28rKlCaLq7EHUeIlgldBrhHvSq7J90=; b=YwgGB3eTWHEmUOecSb5YT pV23BzgcZHJGy+MjPD8YOIWNXX9g30As5SjkR5QMy4PZRtys4bi88qJ30UYCg6WD ZmYMEXWr3S/z2n/FZc4SsiVFuWlw3wbYjk6fb2LxsdpMyvL6Cbt/wo47xIPY50vp HATflXObPVFcFcAtzYo7jc= X-MDAV-Result: clean X-MDAV-Processed: sequoia-grove.ad.secure-endpoints.com, Sat, 27 May 2023 11:08:18 -0400 Received: from [IPV6:2603:7000:73c:9c99:401:2567:fdc3:c2b4] by auristor.com (IPv6:2001:470:1f07:f77:28d9:68fb:855d:c2a5) (MDaemon PRO v23.0.2c) with ESMTPSA id md5001003473523.msg; Sat, 27 May 2023 11:08:17 -0400 X-Spam-Processed: sequoia-grove.ad.secure-endpoints.com, Sat, 27 May 2023 11:08:17 -0400 (not processed: message from trusted or authenticated source) X-MDRemoteIP: 2603:7000:73c:9c99:401:2567:fdc3:c2b4 X-MDHelo: [IPV6:2603:7000:73c:9c99:401:2567:fdc3:c2b4] X-MDArrival-Date: Sat, 27 May 2023 11:08:17 -0400 X-MDOrigin-Country: US, NA X-Authenticated-Sender: jaltman@auristor.com X-Return-Path: prvs=1511ba3f43=jaltman@auristor.com X-Envelope-From: jaltman@auristor.com X-MDaemon-Deliver-To: linux-kernel@vger.kernel.org Message-ID: Date: Sat, 27 May 2023 11:08:10 -0400 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.11.1 From: Jeffrey E Altman Subject: Re: [PATCH net] rxrpc: Truncate UTS_RELEASE for rxrpc version To: David Howells , netdev@vger.kernel.org Cc: Kenny Ho , Marc Dionne , Andrew Lunn , David Laight , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , linux-afs@lists.infradead.org, linux-kernel@vger.kernel.org References: <654974.1685100894@warthog.procyon.org.uk> Content-Language: en-US Organization: AuriStor, Inc. In-Reply-To: <654974.1685100894@warthog.procyon.org.uk> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms030001030300050008010007" X-MDCFSigsAdded: auristor.com X-Spam-Status: No, score=-0.2 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,NICE_REPLY_A,RCVD_IN_DNSWL_NONE, SPF_HELO_PASS,SPF_PASS,T_SCC_BODY_TEXT_LINE,URI_DOTEDU autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is a cryptographically signed message in MIME format. --------------ms030001030300050008010007 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 5/26/2023 7:34 AM, David Howells wrote: > UTS_RELEASE has a maximum length of 64 which can cause rxrpc_version to > exceed the 65 byte message limit. > > Per the rx spec[1]: "If a server receives a packet with a type value > of 13, > and the client-initiated flag set, it should respond with a 65-byte > payload > containing a string that identifies the version of AFS software it is > running." > > The current implementation causes a compile error when WERROR is turned on > and/or UTS_RELEASE exceeds the length of 49 (making the version string > more > than 64 characters). > > Fix this by generating the string during module initialisation and > limiting > the UTS_RELEASE segment of the string does not exceed 49 chars. We need to > make sure that the 64 bytes includes "linux-" at the front and " AF_RXRPC" > at the back as this may be used in pattern matching. > > Fixes: 44ba06987c0b ("RxRPC: Handle VERSION Rx protocol packets") > Reported-by: Kenny Ho > Link: https://lore.kernel.org/r/20230523223944.691076-1-Kenny.Ho@amd.com/ > Signed-off-by: David Howells > Acked-by: Kenny Ho > cc: Marc Dionne > cc: Andrew Lunn > cc: David Laight > cc: "David S. Miller" > cc: Eric Dumazet > cc: Jakub Kicinski > cc: Paolo Abeni > cc: linux-afs@lists.infradead.org > cc: netdev@vger.kernel.org > Link: https://web.mit.edu/kolya/afs/rx/rx-spec [1] > --- > net/rxrpc/af_rxrpc.c | 1 + > net/rxrpc/ar-internal.h | 1 + > net/rxrpc/local_event.c | 11 ++++++++++- > 3 files changed, 12 insertions(+), 1 deletion(-) > > diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c > index 31f738d65f1c..da0b3b5157d5 100644 > --- a/net/rxrpc/af_rxrpc.c > +++ b/net/rxrpc/af_rxrpc.c > @@ -980,6 +980,7 @@ static int __init af_rxrpc_init(void) > BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > sizeof_field(struct > sk_buff, cb)); > ret = -ENOMEM; > + rxrpc_gen_version_string(); > rxrpc_call_jar = kmem_cache_create( > "rxrpc_call_jar", sizeof(struct rxrpc_call), 0, > SLAB_HWCACHE_ALIGN, NULL); > diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h > index 5d44dc08f66d..e8e14c6f904d 100644 > --- a/net/rxrpc/ar-internal.h > +++ b/net/rxrpc/ar-internal.h > @@ -1068,6 +1068,7 @@ int rxrpc_get_server_data_key(struct > rxrpc_connection *, const void *, time64_t, > /* > * local_event.c > */ > +void rxrpc_gen_version_string(void); > void rxrpc_send_version_request(struct rxrpc_local *local, > struct rxrpc_host_header *hdr, > struct sk_buff *skb); > diff --git a/net/rxrpc/local_event.c b/net/rxrpc/local_event.c > index 5e69ea6b233d..993c69f97488 100644 > --- a/net/rxrpc/local_event.c > +++ b/net/rxrpc/local_event.c > @@ -16,7 +16,16 @@ > #include > #include "ar-internal.h" > -static const char rxrpc_version_string[65] = "linux-" UTS_RELEASE " > AF_RXRPC"; > +static char rxrpc_version_string[65]; // "linux-" UTS_RELEASE " > AF_RXRPC"; > + > +/* > + * Generate the VERSION packet string. > + */ > +void rxrpc_gen_version_string(void) > +{ > + snprintf(rxrpc_version_string, sizeof(rxrpc_version_string), > + "linux-%.49s AF_RXRPC", UTS_RELEASE); > +} > /* > * Reply to a version request > Reviewed-by: Jeffrey Altman --------------ms030001030300050008010007 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