From mboxrd@z Thu Jan 1 00:00:00 1970 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 C9057C46CA1 for ; Fri, 15 Sep 2023 20:51:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237536AbjIOUvA (ORCPT ); Fri, 15 Sep 2023 16:51:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37956 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230520AbjIOUuk (ORCPT ); Fri, 15 Sep 2023 16:50:40 -0400 Received: from omta40.uswest2.a.cloudfilter.net (omta40.uswest2.a.cloudfilter.net [35.89.44.39]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2E7B683 for ; Fri, 15 Sep 2023 13:49:57 -0700 (PDT) Received: from eig-obgw-6001a.ext.cloudfilter.net ([10.0.30.140]) by cmsmtp with ESMTP id hExcqkKkVbK1VhFlFqlMjb; Fri, 15 Sep 2023 20:49:57 +0000 Received: from gator4166.hostgator.com ([108.167.133.22]) by cmsmtp with ESMTPS id hFlEqDLyU1SF3hFlEqcwYr; Fri, 15 Sep 2023 20:49:56 +0000 X-Authority-Analysis: v=2.4 cv=Avr9YcxP c=1 sm=1 tr=0 ts=6504c374 a=1YbLdUo/zbTtOZ3uB5T3HA==:117 a=WzbPXH4gqzPVN0x6HrNMNA==:17 a=OWjo9vPv0XrRhIrVQ50Ab3nP57M=:19 a=dLZJa+xiwSxG16/P+YVxDGlgEgI=:19 a=IkcTkHD0fZMA:10 a=zNV7Rl7Rt7sA:10 a=wYkD_t78qR0A:10 a=NEAV23lmAAAA:8 a=20KFwNOVAAAA:8 a=BS-Bl4eDAAAA:8 a=JfrnYn6hAAAA:8 a=cm27Pg_UAAAA:8 a=VwQbUJbxAAAA:8 a=HvF037n1xESchLcPDVoA:9 a=QEXdDO2ut3YA:10 a=Mz5RY1mrK68yK6INR7tS:22 a=1CNFftbPRP8L7MoqJWF3:22 a=xmb-EsYY8bH0VWELuYED:22 a=AjGcO6oz07-iQ99wixmX:22 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=embeddedor.com; s=default; h=Content-Transfer-Encoding:Content-Type: In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date:Message-ID:Sender :Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=WDzRH02xtZOdn1w3Mh08Uj0Kg1XXQkWl85TLPHbY12g=; b=EIxwvVaorObxr7NqbMU1wJcDoE NPFsz2Y1DWsxWX4SI8bAsAyT9DCET++1EuNu5mqDWnMJ7pIDZrkAwb/yS81cne5/NBuGkEfQMrWga FaPrjRUQd+Psnv9VfUNeIPFB7v759CWpg0L2YbbYC4eSEnaCwW4cqCynSultSXp20WF7qADhncX21 kY9uSy88hkjjqIQLHgjtbS7DGcUsj5ZtVdmCmwV4zsknKcZy4t7xhwSfCHvq4La5dL8oLsmaMWw1U pponp75jC/r/M+4yWR1lqX0O8FpnavopKJz9JmX/e03HlUSs74m7OWpRHTRDGxqaMlSoxfiyrsx63 1JZjQ+ww==; Received: from 187-162-21-192.static.axtel.net ([187.162.21.192]:39494 helo=[192.168.15.8]) by gator4166.hostgator.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.96) (envelope-from ) id 1qhFlD-002fGS-1V; Fri, 15 Sep 2023 15:49:55 -0500 Message-ID: Date: Fri, 15 Sep 2023 14:50:51 -0600 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0 Subject: Re: [PATCH] afs: Annotate struct afs_addr_list with __counted_by Content-Language: en-US To: Kees Cook , David Howells Cc: Marc Dionne , linux-afs@lists.infradead.org, Nathan Chancellor , Nick Desaulniers , Tom Rix , linux-kernel@vger.kernel.org, llvm@lists.linux.dev, linux-hardening@vger.kernel.org References: <20230915201449.never.649-kees@kernel.org> From: "Gustavo A. R. Silva" In-Reply-To: <20230915201449.never.649-kees@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - gator4166.hostgator.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - embeddedor.com X-BWhitelist: no X-Source-IP: 187.162.21.192 X-Source-L: No X-Exim-ID: 1qhFlD-002fGS-1V X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: 187-162-21-192.static.axtel.net ([192.168.15.8]) [187.162.21.192]:39494 X-Source-Auth: gustavo@embeddedor.com X-Email-Count: 444 X-Org: HG=hgshared;ORG=hostgator; X-Source-Cap: Z3V6aWRpbmU7Z3V6aWRpbmU7Z2F0b3I0MTY2Lmhvc3RnYXRvci5jb20= X-Local-Domain: yes X-CMAE-Envelope: MS4xfP5qr+x1c7oJZOnmkJwZD3NbGLdNZA3coFdJnz149lsZWrCECUEwqYhSBJrxW9GISTAHjj+hxDZvMg2/TQTemTUdza4QXCao2Ady6qlr4oSMA8xyTUak p7oRlgq5aREZ0xz5z3AI5zBOnera/zqKCURtzkqFC1kZrOWdLqFVIE+mvtI4X487YR2bgdF7yzMGzAlz2eBM9rxzJ2AZwBh6HQOFAgdeJPfSJTjYmV9VBVSn Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org On 9/15/23 14:14, Kees Cook wrote: > Prepare for the coming implementation by GCC and Clang of the __counted_by > attribute. Flexible array members annotated with __counted_by can have > their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS > (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family > functions). > > As found with Coccinelle[1], add __counted_by for struct afs_addr_list. > > [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci > > Cc: David Howells > Cc: Marc Dionne > Cc: linux-afs@lists.infradead.org > Signed-off-by: Kees Cook Reviewed-by: Gustavo A. R. Silva Thanks -- Gustavo > --- > fs/afs/internal.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/fs/afs/internal.h b/fs/afs/internal.h > index da73b97e19a9..07433a5349ca 100644 > --- a/fs/afs/internal.h > +++ b/fs/afs/internal.h > @@ -87,7 +87,7 @@ struct afs_addr_list { > enum dns_lookup_status status:8; > unsigned long failed; /* Mask of addrs that failed locally/ICMP */ > unsigned long responded; /* Mask of addrs that responded */ > - struct sockaddr_rxrpc addrs[]; > + struct sockaddr_rxrpc addrs[] __counted_by(max_addrs); > #define AFS_MAX_ADDRESSES ((unsigned int)(sizeof(unsigned long) * 8)) > }; >