vfs: move_mount: reject moving kernel internal mounts

sys_move_mount() crashes by dereferencing the pointer MNT_NS_INTERNAL,
a.k.a. ERR_PTR(-EINVAL), if the old mount is specified by fd for a
kernel object with an internal mount, such as a pipe or memfd.

Fix it by checking for this case and returning -EINVAL.

[AV: what we want is is_mounted(); use that instead of making the
condition even more convoluted]

Reproducer:

    #include <unistd.h>

    #define __NR_move_mount         429
    #define MOVE_MOUNT_F_EMPTY_PATH 0x00000004

    int main()
    {
    	int fds[2];

    	pipe(fds);
        syscall(__NR_move_mount, fds[0], "", -1, "/", MOVE_MOUNT_F_EMPTY_PATH);
    }

Reported-by: [email protected]
Fixes: 2db154b3ea8e ("vfs: syscall: Add move_mount(2) to move mounts around")
Signed-off-by: Eric Biggers <[email protected]>
Signed-off-by: Al Viro <[email protected]>

0 files changed, 0 insertions, 0 deletions