From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 81A0E31AAB1; Thu, 11 Dec 2025 20:55:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765486550; cv=none; b=OmCBDLnQ+084ECtVjsrjT/NwHQ62akyeS7i1pHN4LFF3LxFh7UUygNJBoQBIbqjozoUTElPf3VbYzpT6jb/Q6poeySPgrTcvONFyoj+EM9MWuJDAM+zgFhR1qfj5dUGFmdZpod3CITNu9H6Dfjj8SlVVpSy78io2HVYy17NEfyA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765486550; c=relaxed/simple; bh=K/WLzP/bD4HdBTPoUNO7H9uTtgyt4DGalgLcoSDVYu0=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=EPu7V2zeLiuleWg+3qUWoLQbpBgZqRr7Liw6kGnqdCJ1u+HW4XYklJw6MjAPUllgqx/BvAB8yaUhbXuIisRz3b1bvVRAt+9P2A0jOJfunWUtXtYuYdDGuC2qILcQf1cLqe/LSlToICw8VG/JQCdx892y2NRBYR1zkk5c9lsNosY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=WufKN1gC; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="WufKN1gC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BD513C4CEF7; Thu, 11 Dec 2025 20:55:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1765486550; bh=K/WLzP/bD4HdBTPoUNO7H9uTtgyt4DGalgLcoSDVYu0=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=WufKN1gCrT0JM7KtEPQ9expLQ/bDQM4bmHZ6t5waGW/kHT7Wo1Kshjibol2et0Ctz 5UYdWl5oG+oJ06UTO4q1jMYQnBQcNnj7CyP/iwQhk7PpcLXXIIKqO53c6tFxhES3Um GF33Q8nBMJA5C8hqNbGxkEHXRfg8LQ1OtqM0Jt060XjgPf/WAjMWtT3G3KtmnR1I+x rfA2MkqJvJZ5YfSDrCBRU87ucIQ11DCMnmUdG0Yv4RbteS3ijYRWSyvQtvE7PQHMCs Jfts4e2y86NWAV2uW5Pq8NTju2liL3xtOz6apFrNH1WfqVZGlW9hMzUhUKo7pAfw0N svwz+hPK2a2gQ== Message-ID: <2b193b5ccd696420196ae9059f83dcc8b3f06473.camel@kernel.org> Subject: Re: xfs/ima: Regression caching i_version From: Jeff Layton To: Frederick Lawler Cc: Christian Brauner , "Darrick J. Wong" , Josef Bacik , Carlos Maiolino , linux-xfs@vger.kernel.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, linux-integrity@vger.kernel.org, Roberto Sassu , kernel-team@cloudflare.com Date: Fri, 12 Dec 2025 05:55:45 +0900 In-Reply-To: References: Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 0OX6MYPtv76hka8lW4mnRmZqqx3UtfHX/hF/zH24Gj7A6sYKYLCU3YrI2Ogiu7/ksKcl7goQjpvtV YrOOI5VGLHge0awt7bhMCTM9KAfPc+xL/ZxAMVWd3NCk5SamL2cE99UWgtvNOIYU8m6EjTLhsj8sn VluJH0/RcxEeFbnSaswVChNSGa7mXJrTR22lRL6ZPjdMgS2Km90haWPRc8Wolcz07Y2se0xpGVLEQ cDEsvv5IMmeMe1/qLZ6NaVkNuL3WOXvxaVT9USW1+/SGipO2IpKJjeDZfehlB/kpfF24+RrK+seQf 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Yy9YbXtWctUz8uvDR7shsQxAhX3qO7DilMtuGo1v97I/Kx4gXQ52syh/w6EBny71CZrOgD6kJwPVV AaM1LRC28muq91WCFhs/nzHozpbzcheyGtMUI2Ao4K6mnY+3zIuXPygZMFr9KXE6fF7HzKxKuZMJO aEZCiDOq0anx6FmOzs5E6Jqdpo/mtI8beK+BE7Va6ni7YrQlnT0i3vaTVMTiCThbqsB20VrbMjlhp f8lfK1XVNbRq/R7GZ9zHESlsa35ha60yd/j3pu5hT2xyy8krV8vGhHvnJ1XRMJBAB/UYb6FyC7S+m QZIQXVeAA+smfTT0tDrisj1U5x6ZB9b3nBg65kc= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.2 (3.58.2-1.fc43) Precedence: bulk X-Mailing-List: linux-integrity@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Thu, 2025-12-11 at 14:29 -0600, Frederick Lawler wrote: > Hi Jeff, >=20 > While testing 6.18, I think I found a regression with > commit 1cf7e834a6fb ("xfs: switch to multigrain timestamps") since 6.13 > where IMA is no longer able to properly cache i_version when we overlay > tmpfs on top of XFS. Each measurement diff check in function > process_measurement() reports that the i_version is > always set to zero for iint->real_inode.version. >=20 > The function ima_collect_measurement() is looking to extract the version > from the cookie on next measurement to cache i_version. >=20 > I'm unclear from the commit description what the right approach here is: > update in IMA land by checking for time changes, or do > something else such as adding the cookie back. >=20 >=20 What we probably want to do is switch to using the ctime to manufacture a change attribute when STATX_CHANGE_ATTRIBUTE is not set in the statx reply. IIRC, IMA doesn't need to persist these values across reboot, so something like this (completely untested) might work, but it may be better to lift nfsd4_change_attribute() into a common header and use the same mechanism for both: diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_= api.c index c35ea613c9f8..5a71845f579e 100644 --- a/security/integrity/ima/ima_api.c +++ b/security/integrity/ima/ima_api.c @@ -272,10 +272,14 @@ int ima_collect_measurement(struct ima_iint_cache *ii= nt, struct file *file, * to an initial measurement/appraisal/audit, but was modified to * assume the file changed. */ - result =3D vfs_getattr_nosec(&file->f_path, &stat, STATX_CHANGE_COO= KIE, + result =3D vfs_getattr_nosec(&file->f_path, &stat, STATX_CHANGE_COO= KIE | STATX_CTIME, AT_STATX_SYNC_AS_STAT); - if (!result && (stat.result_mask & STATX_CHANGE_COOKIE)) - i_version =3D stat.change_cookie; + if (!result) { + if (stat.result_mask & STATX_CHANGE_COOKIE) + i_version =3D stat.change_cookie; + else if (stat.result_mask & STATX_CTIME) + i_version =3D stat.ctime.tv_sec ^ stat.ctime.tv_nse= c; + } hash.hdr.algo =3D algo; hash.hdr.length =3D hash_digest_size[algo]; =20