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| author | Miklos Szeredi <mszeredi@redhat.com> | 2020-07-14 15:45:41 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-07-22 10:33:12 +0300 |
| commit | f96ce4be463a852348155e1662a94965a7a70244 (patch) | |
| tree | 515f2c2369af592a3871f4ac181886237802250e /fs/fuse | |
| parent | 09b696bd214915ca72a5d0925690580292bde00c (diff) | |
| download | linux-f96ce4be463a852348155e1662a94965a7a70244.tar.xz | |
fuse: ignore 'data' argument of mount(..., MS_REMOUNT)
commit e8b20a474cf2c42698d1942f939ff2128819f151 upstream.
The command
mount -o remount -o unknownoption /mnt/fuse
succeeds on kernel versions prior to v5.4 and fails on kernel version at or
after. This is because fuse_parse_param() rejects any unrecognised options
in case of FS_CONTEXT_FOR_RECONFIGURE, just as for FS_CONTEXT_FOR_MOUNT.
This causes a regression in case the fuse filesystem is in fstab, since
remount sends all options found there to the kernel; even ones that are
meant for the initial mount and are consumed by the userspace fuse server.
Fix this by ignoring mount options, just as fuse_remount_fs() did prior to
the conversion to the new API.
Reported-by: Stefan Priebe <s.priebe@profihost.ag>
Fixes: c30da2e981a7 ("fuse: convert to use the new mount API")
Cc: <stable@vger.kernel.org> # v5.4
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/fuse')
| -rw-r--r-- | fs/fuse/inode.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index 16aec32f7f3d..f3393262f2f5 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -473,6 +473,13 @@ static int fuse_parse_param(struct fs_context *fc, struct fs_parameter *param) struct fuse_fs_context *ctx = fc->fs_private; int opt; + /* + * Ignore options coming from mount(MS_REMOUNT) for backward + * compatibility. + */ + if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) + return 0; + opt = fs_parse(fc, &fuse_fs_parameters, param, &result); if (opt < 0) return opt; |