linux-kernel - Re: [PATCH] random: don't forget compat

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Date:   Tue, 17 Dec 2019 20:36:48 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] random: don't forget compat_ioctl on unrandom

On Tue, Dec 17, 2019 at 6:25 PM Jason A. Donenfeld <Jason@...c4.com> wrote:
>
> Recently, there's been some compat ioctl cleanup, in which large
> hardcoded lists were replaced with compat_ptr_ioctl. One of these
> changes involved removing the random.c hardcoded list entries and adding
> a compat ioctl function pointer to the random.c fops. In the process,
> urandom was forgotten about, so this commit fixes that oversight.
>
> Fixes: 507e4e2b430b ("compat_ioctl: remove /dev/random commands")
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>

Thanks for debugging this. I had already sent the same
patch a few days ago after the first report:

https://lore.kernel.org/lkml/20191207185837.4030699-1-arnd@arndb.de/

Greg, can you please apply one of these and send it to Linus for 5.5-rc3?

     Arnd

> ---
>  drivers/char/random.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/char/random.c b/drivers/char/random.c
> index 909e0c3d82ea..cda12933a17d 100644
> --- a/drivers/char/random.c
> +++ b/drivers/char/random.c
> @@ -2175,6 +2175,7 @@ const struct file_operations urandom_fops = {
>         .read  = urandom_read,
>         .write = random_write,
>         .unlocked_ioctl = random_ioctl,
> +       .compat_ioctl = compat_ptr_ioctl,
>         .fasync = random_fasync,
>         .llseek = noop_llseek,
>  };
> --
> 2.24.1
>