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| author | Miklos Szeredi <mszeredi@redhat.com> | 2020-07-14 14:45:41 +0200 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2020-07-14 14:45:41 +0200 |
| commit | e8b20a474cf2c42698d1942f939ff2128819f151 (patch) | |
| tree | a20e3fa2b3d253e12e85d5ab2ff58a82ab754ef3 | |
| parent | 0189a2d367f49729622fdafaef5da73161591859 (diff) | |
| download | linux-e8b20a474cf2c42698d1942f939ff2128819f151.tar.bz2 | |
fuse: ignore 'data' argument of mount(..., MS_REMOUNT)
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>
| -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 be39dff57c28..ba201bf5ffad 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -477,6 +477,13 @@ 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; |