From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-40595-1519693073-5-8481594613007367928 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.249, ME_NOAUTH 0.01, RCVD_IN_DNSWL_HI -5, T_RP_MATCHES_RCVD -0.01, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='CN', FromHeader='uk', MailFrom='org' X-Spam-charsets: to='iso-8859-1', plain='iso-8859-1' X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: linux-api-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=arctest; t=1519693073; b=h1djzuiNiqEfddtXQXI3irZXUB4hXFriXatjQzqfJ/avV4/ QOwTMx93NJxZ5Z4R9GKKpkQayI8oj6ginr4Eq9lMpXymYYBCUzXwWDz+/fLnm5AZ vg1qemyDMLHCHaEw7vddA39XbDMuIdksroPist+w84XJlrevdvnkXORbQdRaHvSA etmgd8wT4CqXZgmCYSGsNXVGozAyp05Bbk0CtY3LYspxbqscFrRx4UFghzvvwptM qmxcvGlMC93C4WoZiT3iT0A0uQEZuGFaYkasKkrppBDWuh2Wv9QQEPAB5WDaETmD Arf1dhT66NNQMpiaiuBTkj3NQxs2Ur7v+X6AoXw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=date:from:to:cc:subject:message-id :references:mime-version:content-type:content-transfer-encoding :in-reply-to:sender:list-id; s=arctest; t=1519693073; bh=gq5GeCU X3vbs4tIm2AkXfHfuQuF1di7zyX4o1b5Fz5w=; b=J8eTvoyDNsDpIyHMnOuJing 4EaR4HfonM2/z16u5HKqeomyHy3nWKbFsuOAWrj6sPUYvGy+Fs8FbCdzHxzcHdOd vCAvRKoqYFntJL5WLKkSUMGrrvlQ/Qq3jF2gdn759sIjYG96Z2poom02i0wDv0p5 FchIBIXuMxsKIdtNylJ+jRi/1OXDUdAnD+YqtmdFysi0TPsFm7J4QUXd2PXw5ng2 GWNKVImR+PG4OsszVCblPpBPjX+XLHWKYWrqek1aqzajeAtjvFwY6w0F1eaonQKC AUc17esvuRD3XoPhQAZC2kv8ZBLfIaLbLOmaK1QFCfJbQJGN3Iofuk4P/2q5AXg= = ARC-Authentication-Results: i=1; mx2.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=zeniv.linux.org.uk; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=linux-api-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=zeniv.linux.org.uk header.mx.error=NOERROR header.result=warn header_org.domain=linux.org.uk header_org.result=pass header_is_org_domain=no Authentication-Results: mx2.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=zeniv.linux.org.uk; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=linux-api-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=zeniv.linux.org.uk header.mx.error=NOERROR header.result=warn header_org.domain=linux.org.uk header_org.result=pass header_is_org_domain=no Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751779AbeB0A5d (ORCPT ); Mon, 26 Feb 2018 19:57:33 -0500 Received: from zeniv.linux.org.uk ([195.92.253.2]:34942 "EHLO ZenIV.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751764AbeB0A5c (ORCPT ); Mon, 26 Feb 2018 19:57:32 -0500 Date: Tue, 27 Feb 2018 00:57:21 +0000 From: Al Viro To: =?iso-8859-1?Q?Micka=EBl_Sala=FCn?= Cc: linux-kernel@vger.kernel.org, Alexei Starovoitov , Andy Lutomirski , Arnaldo Carvalho de Melo , Casey Schaufler , Daniel Borkmann , David Drysdale , "David S . Miller" , "Eric W . Biederman" , James Morris , Jann Horn , Jonathan Corbet , Michael Kerrisk , Kees Cook , Paul Moore , Sargun Dhillon , "Serge E . Hallyn" , Shuah Khan , Tejun Heo , Thomas Graf , Tycho Andersen , Will Drewry , kernel-hardening@lists.openwall.com, linux-api@vger.kernel.org, linux-security-module@vger.kernel.org, netdev@vger.kernel.org, James Morris , John Johansen , Stephen Smalley , Tetsuo Handa , linux-fsdevel@vger.kernel.org Subject: Re: [PATCH bpf-next v8 01/11] fs,security: Add a security blob to nameidata Message-ID: <20180227005721.GK30522@ZenIV.linux.org.uk> References: <20180227004121.3633-1-mic@digikod.net> <20180227004121.3633-2-mic@digikod.net> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20180227004121.3633-2-mic@digikod.net> User-Agent: Mutt/1.9.1 (2017-09-22) Sender: linux-api-owner@vger.kernel.org X-Mailing-List: linux-api@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On Tue, Feb 27, 2018 at 01:41:11AM +0100, Mickaël Salaün wrote: > The function current_nameidata_security(struct inode *) can be used to > retrieve a blob's pointer address tied to the inode being walk through. > This enable to follow a path lookup and know where an inode access come > from. This is needed for the Landlock LSM to be able to restrict access > to file path. > > The LSM hook nameidata_free_security(struct inode *) is called before > freeing the associated nameidata. NAK. Not without well-defined semantics and "some Linux S&M uses that for something, don't ask what" does not count.