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 04FC213D28F for ; Sun, 15 Dec 2024 08:52:31 +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=1734252751; cv=none; b=Yb4MgCgWFHrLYbU3AslogR22HtFlFQ/wbz5RzF5c7bQXzPvkzRyyweHxgp8fizPuouKMICB7mvuSUO7RrrF7NKhEIDf16ZrpTi4+asc7O+GeqZ2UlG8gliVlVhKPTI1mV7T1LimQIN4jfkg4gGBxEnVEdvVKViDfNJ2f/kWetag= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734252751; c=relaxed/simple; bh=VEMwDvCyB1WdALFCT1QWuEHZy/h9Ot7tjXy40Z1m39Q=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=QZBZS5hm+sITpn8N6wQfu5e9RiZqsda/ynJSRdUwkDHsWngJZroMlGPqTBEJ7vVe+cRgxzMdSCulsbej7sEQeOp6KUdi7RV/NFKS9Nzu+xm4vgvLcj7Cr6QpptYPKxmgMQHetS2Bhg+ehxXl5MRqjXZOJXXFOOkmWmLOHoXUC2Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=j198V12n; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="j198V12n" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6D597C4CECE; Sun, 15 Dec 2024 08:52:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1734252750; bh=VEMwDvCyB1WdALFCT1QWuEHZy/h9Ot7tjXy40Z1m39Q=; h=Subject:To:Cc:From:Date:From; b=j198V12nfFOGKS2OyL0SLLokk8xEFsPCp+6KamxxBPseJhIEajkR7ebFht9NOCn20 ioWy/wLW0GQhRAEsFshc58mFw3wuwpwbaALlnWAfLrJSnIK57wP6rkBTVl42enIq3x 7AwAJPD5vnUyW59dsTsRsbI5tE6msb7pDrHvzmd0= Subject: FAILED: patch "[PATCH] xfs: fix zero byte checking in the superblock scrubber" failed to apply to 5.15-stable tree To: djwong@kernel.org,hch@lst.de,stable@vger.kernel.org Cc: From: Date: Sun, 15 Dec 2024 09:52:22 +0100 Message-ID: <2024121522-parcel-pebble-9775@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x c004a793e0ec34047c3bd423bcd8966f5fac88dc # git commit -s git send-email --to '' --in-reply-to '2024121522-parcel-pebble-9775@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From c004a793e0ec34047c3bd423bcd8966f5fac88dc Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 2 Dec 2024 10:57:42 -0800 Subject: [PATCH] xfs: fix zero byte checking in the superblock scrubber The logic to check that the region past the end of the superblock is all zeroes is wrong -- we don't want to check only the bytes past the end of the maximally sized ondisk superblock structure as currently defined in xfs_format.h; we want to check the bytes beyond the end of the ondisk as defined by the feature bits. Port the superblock size logic from xfs_repair and then put it to use in xfs_scrub. Cc: # v4.15 Fixes: 21fb4cb1981ef7 ("xfs: scrub the secondary superblocks") Signed-off-by: "Darrick J. Wong" Reviewed-by: Christoph Hellwig diff --git a/fs/xfs/scrub/agheader.c b/fs/xfs/scrub/agheader.c index 88063d67cb5f..9f8c312dfd3c 100644 --- a/fs/xfs/scrub/agheader.c +++ b/fs/xfs/scrub/agheader.c @@ -59,6 +59,32 @@ xchk_superblock_xref( /* scrub teardown will take care of sc->sa for us */ } +/* + * Calculate the ondisk superblock size in bytes given the feature set of the + * mounted filesystem (aka the primary sb). This is subtlely different from + * the logic in xfs_repair, which computes the size of a secondary sb given the + * featureset listed in the secondary sb. + */ +STATIC size_t +xchk_superblock_ondisk_size( + struct xfs_mount *mp) +{ + if (xfs_has_metadir(mp)) + return offsetofend(struct xfs_dsb, sb_pad); + if (xfs_has_metauuid(mp)) + return offsetofend(struct xfs_dsb, sb_meta_uuid); + if (xfs_has_crc(mp)) + return offsetofend(struct xfs_dsb, sb_lsn); + if (xfs_sb_version_hasmorebits(&mp->m_sb)) + return offsetofend(struct xfs_dsb, sb_bad_features2); + if (xfs_has_logv2(mp)) + return offsetofend(struct xfs_dsb, sb_logsunit); + if (xfs_has_sector(mp)) + return offsetofend(struct xfs_dsb, sb_logsectsize); + /* only support dirv2 or more recent */ + return offsetofend(struct xfs_dsb, sb_dirblklog); +} + /* * Scrub the filesystem superblock. * @@ -75,6 +101,7 @@ xchk_superblock( struct xfs_buf *bp; struct xfs_dsb *sb; struct xfs_perag *pag; + size_t sblen; xfs_agnumber_t agno; uint32_t v2_ok; __be32 features_mask; @@ -388,8 +415,8 @@ xchk_superblock( } /* Everything else must be zero. */ - if (memchr_inv(sb + 1, 0, - BBTOB(bp->b_length) - sizeof(struct xfs_dsb))) + sblen = xchk_superblock_ondisk_size(mp); + if (memchr_inv((char *)sb + sblen, 0, BBTOB(bp->b_length) - sblen)) xchk_block_set_corrupt(sc, bp); xchk_superblock_xref(sc, bp);