linux-kernel - Re: [PATCH] signal: propagate _

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Date:   Mon, 7 Dec 2020 14:04:49 +0100
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     Lukas Bulwahn <lukas.bulwahn@...il.com>
Cc:     Christian Brauner <christian@...uner.io>,
        linux-kernel@...r.kernel.org, Tycho Andersen <tycho@...ho.ws>,
        Kees Cook <keescook@...omium.org>,
        David Howells <dhowells@...hat.com>,
        Arnd Bergmann <arnd@...db.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Serge Hallyn <serge@...lyn.com>,
        Aleksa Sarai <cyphar@...har.com>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] signal: propagate __user annotations properly

On Mon, Dec 07, 2020 at 01:36:10PM +0100, Lukas Bulwahn wrote:
> Commit 3eb39f47934f ("signal: add pidfd_send_signal() syscall") introduced
> copy_siginfo_from_user_any(), but missed to add the __user annotation to
> the user pointer that is passed as second argument.
> 
> Hence, when copy_siginfo_from_user_any() calls copy_siginfo_from_user(),
> sparse warns:
> 
>   kernel/signal.c:3716:46: warning: incorrect type in argument 2 (different address spaces)
>   kernel/signal.c:3716:46:    expected struct siginfo const [noderef] [usertype] __user *from
>   kernel/signal.c:3716:46:    got struct siginfo [usertype] *info
> 
> And when pidfd_send_signal() calls copy_siginfo_from_user_any(), sparse
> warns as well:
> 
>   kernel/signal.c:3776:58: warning: incorrect type in argument 2 (different address spaces)
>   kernel/signal.c:3776:58:    expected struct siginfo [usertype] *info
>   kernel/signal.c:3776:58:    got struct siginfo [noderef] [usertype] __user *info
> 
> Add the __user annotation to repair this chain of propagating __user
> annotations.
> 
> Signed-off-by: Lukas Bulwahn <lukas.bulwahn@...il.com>
> ---
> applies cleanly on current master (v5.10-rc7) and next-20201204
> 
> Christian, please pick this minor non-urgent clean-up patch.

Thanks for the patch. Unfortunately I already picked up Jann's patch who
sent it yesterday or this morning:
https://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux.git/commit/?h=pidfd

Thanks!
Christian