Re: [PATCH] vfs: move_mount: reject moving kernel internal mounts

[Eric Biggers]

On Sat, Jun 29, 2019 at 01:27:44PM -0700, Eric Biggers wrote:
> 
> 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);
>     }

David, I'd like to add this as a regression test somewhere.

Can you point me to the tests for the new mount syscalls?

I checked LTP, kselftests, and xfstests, but nothing to be found.

- Eric