From: Jan Kara <jack@suse.cz> To: <linux-fsdevel@vger.kernel.org> Cc: Christoph Hellwig <hch@infradead.org>, Dave Chinner <david@fromorbit.com>, ceph-devel@vger.kernel.org, Chao Yu <yuchao0@huawei.com>, Damien Le Moal <damien.lemoal@wdc.com>, "Darrick J. Wong" <darrick.wong@oracle.com>, Jaegeuk Kim <jaegeuk@kernel.org>, Jeff Layton <jlayton@kernel.org>, Johannes Thumshirn <jth@kernel.org>, linux-cifs@vger.kernel.org, <linux-ext4@vger.kernel.org>, linux-f2fs-devel@lists.sourceforge.net, <linux-mm@kvack.org>, <linux-xfs@vger.kernel.org>, Miklos Szeredi <miklos@szeredi.hu>, Steve French <sfrench@samba.org>, Ted Tso <tytso@mit.edu>, Matthew Wilcox <willy@infradead.org>, Jan Kara <jack@suse.cz> Subject: [PATCH 14/14] cifs: Fix race between hole punch and page fault Date: Mon, 7 Jun 2021 16:52:24 +0200 [thread overview] Message-ID: <20210607145236.31852-14-jack@suse.cz> (raw) In-Reply-To: <20210607144631.8717-1-jack@suse.cz> Cifs has a following race between hole punching and page fault: CPU1 CPU2 smb3_fallocate() smb3_punch_hole() truncate_pagecache_range() filemap_fault() - loads old data into the page cache SMB2_ioctl(..., FSCTL_SET_ZERO_DATA, ...) And now we have stale data in the page cache. Fix the problem by locking out faults (as well as reads) using mapping->invalidate_lock while hole punch is running. CC: Steve French <sfrench@samba.org> CC: linux-cifs@vger.kernel.org Signed-off-by: Jan Kara <jack@suse.cz> --- fs/cifs/smb2ops.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index dd0eb665b680..e41ea254beaa 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -3579,6 +3579,7 @@ static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon, return rc; } + filemap_invalidate_lock(inode->i_mapping); /* * We implement the punch hole through ioctl, so we need remove the page * caches first, otherwise the data may be inconsistent with the server. @@ -3596,6 +3597,7 @@ static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon, sizeof(struct file_zero_data_information), CIFSMaxBufSize, NULL, NULL); free_xid(xid); + filemap_invalidate_unlock(inode->i_mapping); return rc; } -- 2.26.2
WARNING: multiple messages have this Message-ID (diff)
From: Jan Kara <jack@suse.cz> To: <linux-fsdevel@vger.kernel.org> Cc: linux-cifs@vger.kernel.org, Damien Le Moal <damien.lemoal@wdc.com>, linux-ext4@vger.kernel.org, Ted Tso <tytso@mit.edu>, "Darrick J. Wong" <darrick.wong@oracle.com>, Jeff Layton <jlayton@kernel.org>, Steve French <sfrench@samba.org>, Dave Chinner <david@fromorbit.com>, Matthew Wilcox <willy@infradead.org>, linux-f2fs-devel@lists.sourceforge.net, Christoph Hellwig <hch@infradead.org>, linux-mm@kvack.org, Miklos Szeredi <miklos@szeredi.hu>, Jan Kara <jack@suse.cz>, Jaegeuk Kim <jaegeuk@kernel.org>, ceph-devel@vger.kernel.org, Johannes Thumshirn <jth@kernel.org>, linux-xfs@vger.kernel.org Subject: [f2fs-dev] [PATCH 14/14] cifs: Fix race between hole punch and page fault Date: Mon, 7 Jun 2021 16:52:24 +0200 [thread overview] Message-ID: <20210607145236.31852-14-jack@suse.cz> (raw) In-Reply-To: <20210607144631.8717-1-jack@suse.cz> Cifs has a following race between hole punching and page fault: CPU1 CPU2 smb3_fallocate() smb3_punch_hole() truncate_pagecache_range() filemap_fault() - loads old data into the page cache SMB2_ioctl(..., FSCTL_SET_ZERO_DATA, ...) And now we have stale data in the page cache. Fix the problem by locking out faults (as well as reads) using mapping->invalidate_lock while hole punch is running. CC: Steve French <sfrench@samba.org> CC: linux-cifs@vger.kernel.org Signed-off-by: Jan Kara <jack@suse.cz> --- fs/cifs/smb2ops.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index dd0eb665b680..e41ea254beaa 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -3579,6 +3579,7 @@ static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon, return rc; } + filemap_invalidate_lock(inode->i_mapping); /* * We implement the punch hole through ioctl, so we need remove the page * caches first, otherwise the data may be inconsistent with the server. @@ -3596,6 +3597,7 @@ static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon, sizeof(struct file_zero_data_information), CIFSMaxBufSize, NULL, NULL); free_xid(xid); + filemap_invalidate_unlock(inode->i_mapping); return rc; } -- 2.26.2 _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
next prev parent reply other threads:[~2021-06-07 14:52 UTC|newest] Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-06-07 14:52 [PATCH 0/14 v7] fs: Hole punch vs page cache filling races Jan Kara 2021-06-07 14:52 ` [f2fs-dev] " Jan Kara 2021-06-07 14:52 ` [PATCH 01/14] mm: Fix comments mentioning i_mutex Jan Kara 2021-06-07 14:52 ` [f2fs-dev] " Jan Kara 2021-06-07 15:31 ` Darrick J. Wong 2021-06-07 15:31 ` [f2fs-dev] " Darrick J. Wong 2021-06-10 9:06 ` Ming Lei 2021-06-10 9:06 ` [f2fs-dev] " Ming Lei 2021-06-10 10:40 ` Jan Kara 2021-06-10 10:40 ` [f2fs-dev] " Jan Kara 2021-06-07 14:52 ` [PATCH 02/14] documentation: Sync file_operations members with reality Jan Kara 2021-06-07 14:52 ` [f2fs-dev] " Jan Kara 2021-06-07 14:52 ` [PATCH 03/14] mm: Protect operations adding pages to page cache with invalidate_lock Jan Kara 2021-06-07 14:52 ` [f2fs-dev] " Jan Kara 2021-06-07 16:09 ` Darrick J. Wong 2021-06-07 16:09 ` [f2fs-dev] " Darrick J. Wong 2021-06-08 12:19 ` Jan Kara 2021-06-08 12:19 ` [f2fs-dev] " Jan Kara 2021-06-07 14:52 ` [PATCH 04/14] mm: Add functions to lock invalidate_lock for two mappings Jan Kara 2021-06-07 14:52 ` [f2fs-dev] " Jan Kara 2021-06-07 15:46 ` Darrick J. Wong 2021-06-07 15:46 ` [f2fs-dev] " Darrick J. Wong 2021-06-07 14:52 ` [PATCH 05/14] ext4: Convert to use mapping->invalidate_lock Jan Kara 2021-06-07 14:52 ` [f2fs-dev] " Jan Kara 2021-06-07 14:52 ` [PATCH 06/14] ext2: Convert to using invalidate_lock Jan Kara 2021-06-07 14:52 ` [f2fs-dev] " Jan Kara 2021-06-07 14:52 ` [PATCH 07/14] xfs: Refactor xfs_isilocked() Jan Kara 2021-06-07 14:52 ` [f2fs-dev] " Jan Kara 2021-06-07 15:49 ` Darrick J. Wong 2021-06-07 15:49 ` [f2fs-dev] " Darrick J. Wong 2021-06-08 22:18 ` Dave Chinner 2021-06-08 22:18 ` [f2fs-dev] " Dave Chinner 2021-06-07 14:52 ` [PATCH 08/14] xfs: Convert to use invalidate_lock Jan Kara 2021-06-07 14:52 ` [f2fs-dev] " Jan Kara 2021-06-07 15:56 ` Darrick J. Wong 2021-06-07 15:56 ` [f2fs-dev] " Darrick J. Wong 2021-06-08 12:23 ` Jan Kara 2021-06-08 12:23 ` [f2fs-dev] " Jan Kara 2021-06-07 14:52 ` [PATCH 09/14] xfs: Convert double locking of MMAPLOCK to use VFS helpers Jan Kara 2021-06-07 14:52 ` [f2fs-dev] " Jan Kara 2021-06-07 15:57 ` Darrick J. Wong 2021-06-07 15:57 ` [f2fs-dev] " Darrick J. Wong 2021-06-07 14:52 ` [PATCH 10/14] zonefs: Convert to using invalidate_lock Jan Kara 2021-06-07 14:52 ` [f2fs-dev] " Jan Kara 2021-06-07 14:52 ` [PATCH 11/14] f2fs: " Jan Kara 2021-06-07 14:52 ` [f2fs-dev] " Jan Kara 2021-06-07 14:52 ` [PATCH 12/14] fuse: " Jan Kara 2021-06-07 14:52 ` [f2fs-dev] " Jan Kara 2021-06-10 12:42 ` Miklos Szeredi 2021-06-10 12:42 ` [f2fs-dev] " Miklos Szeredi 2021-06-10 12:42 ` Miklos Szeredi 2021-06-07 14:52 ` [PATCH 13/14] ceph: Fix race between hole punch and page fault Jan Kara 2021-06-07 14:52 ` [f2fs-dev] " Jan Kara 2021-06-07 14:52 ` Jan Kara [this message] 2021-06-07 14:52 ` [f2fs-dev] [PATCH 14/14] cifs: " Jan Kara 2021-06-08 11:54 ` [PATCH 0/14 v7] fs: Hole punch vs page cache filling races Jan Kara 2021-06-08 11:54 ` [f2fs-dev] " Jan Kara 2021-06-15 9:17 [PATCH 0/14 v8] " Jan Kara 2021-06-15 9:18 ` [PATCH 14/14] cifs: Fix race between hole punch and page fault Jan Kara 2021-07-12 16:55 [PATCH 0/14 v9] fs: Hole punch vs page cache filling races Jan Kara 2021-07-12 16:56 ` [PATCH 14/14] cifs: Fix race between hole punch and page fault Jan Kara 2021-07-15 13:40 [PATCH 0/14 v10] fs: Hole punch vs page cache filling races Jan Kara 2021-07-15 13:40 ` [PATCH 14/14] cifs: Fix race between hole punch and page fault Jan Kara
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20210607145236.31852-14-jack@suse.cz \ --to=jack@suse.cz \ --cc=ceph-devel@vger.kernel.org \ --cc=damien.lemoal@wdc.com \ --cc=darrick.wong@oracle.com \ --cc=david@fromorbit.com \ --cc=hch@infradead.org \ --cc=jaegeuk@kernel.org \ --cc=jlayton@kernel.org \ --cc=jth@kernel.org \ --cc=linux-cifs@vger.kernel.org \ --cc=linux-ext4@vger.kernel.org \ --cc=linux-f2fs-devel@lists.sourceforge.net \ --cc=linux-fsdevel@vger.kernel.org \ --cc=linux-mm@kvack.org \ --cc=linux-xfs@vger.kernel.org \ --cc=miklos@szeredi.hu \ --cc=sfrench@samba.org \ --cc=tytso@mit.edu \ --cc=willy@infradead.org \ --cc=yuchao0@huawei.com \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.