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 249A942AB3 for ; Sun, 15 Dec 2024 08:36:24 +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=1734251784; cv=none; b=rHE/HUpp09+PKOxbRVR/r047Q0mO4fK/prgqXNSVQmJBypzX32zgNxiCMMopwwCqJUQQE4RMDDbZFuRuYsh+CP3Zk6vRzRo4nNhbWARC7uPx/zPLAvf0qM4las1NyX+jhALOJ+Y3n+d9XzcHklWJaCCZ8+Oek+2Lxp/b+MGJzuY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734251784; c=relaxed/simple; bh=wnHGX8L+k3W/hWARiSxsuCcLx6c8oKJxRF7M6wWoeYg=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=uiQP+NskmKIO5rOumdehqGDTsJDrRW5AsIJSAbYiIgDerHUO628v6d8VJ6LFNGXSOYxxJ309icwWvqO5DEfCvDO7w8L17HIG2OVpZexBU/el409wk3fRmrK6EI7N8UZFD6v2AzSUGuBetQsVlOeU/Fq+pVXOLpsk4hEb2n8gedU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=RowmBteA; 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="RowmBteA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8666EC4CECE; Sun, 15 Dec 2024 08:36:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1734251784; bh=wnHGX8L+k3W/hWARiSxsuCcLx6c8oKJxRF7M6wWoeYg=; h=Subject:To:Cc:From:Date:From; b=RowmBteAYu1xNutMxnzJH7swv+Pp/M9Fn2a66I5zvqy38BJAxOXg7VhcNwDVIjn3V IH7zRLNi7bIXHkBqDa8MsJ4TaWnu+0o9+SqWJbwo0tB9q/FFjnZQUSKveWZ4HZrisP 4LZmGWLel4hXXuHXqc3S1NjvJVRc6tYv8jPlHDuU= Subject: FAILED: patch "[PATCH] xfs: fix zero byte checking in the superblock scrubber" failed to apply to 5.4-stable tree To: djwong@kernel.org,hch@lst.de,stable@vger.kernel.org Cc: From: Date: Sun, 15 Dec 2024 09:36:12 +0100 Message-ID: <2024121512-dazzling-encounter-7d53@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 5.4-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-5.4.y git checkout FETCH_HEAD git cherry-pick -x c004a793e0ec34047c3bd423bcd8966f5fac88dc # git commit -s git send-email --to '' --in-reply-to '2024121512-dazzling-encounter-7d53@gregkh' --subject-prefix 'PATCH 5.4.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);