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authorMiklos Szeredi <mszeredi@redhat.com>2020-07-14 15:45:41 +0300
committerMiklos Szeredi <mszeredi@redhat.com>2020-07-14 15:45:41 +0300
commite8b20a474cf2c42698d1942f939ff2128819f151 (patch)
treea20e3fa2b3d253e12e85d5ab2ff58a82ab754ef3 /fs/namespace.c
parent0189a2d367f49729622fdafaef5da73161591859 (diff)
downloadlinux-e8b20a474cf2c42698d1942f939ff2128819f151.tar.xz
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>
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