linux-kernel - Re: [PATCH v2 2/5] pid: add pidfd

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Date:   Sat, 30 Mar 2019 12:53:57 +0100
From:   Jürg Billeter <j@...ron.ch>
To:     Christian Brauner <christian@...uner.io>, jannh@...gle.com,
        luto@...nel.org, dhowells@...hat.com, serge@...lyn.com,
        linux-api@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     arnd@...db.de, ebiederm@...ssion.com, khlebnikov@...dex-team.ru,
        keescook@...omium.org, adobriyan@...il.com, tglx@...utronix.de,
        mtk.manpages@...il.com, bl0pbl33p@...il.com, ldv@...linux.org,
        akpm@...ux-foundation.org, oleg@...hat.com,
        nagarathnam.muthusamy@...cle.com, cyphar@...har.com,
        viro@...iv.linux.org.uk, joel@...lfernandes.org, dancol@...gle.com
Subject: Re: [PATCH v2 2/5] pid: add pidfd_open()

On Fri, 2019-03-29 at 16:54 +0100, Christian Brauner wrote:
> diff --git a/include/uapi/linux/wait.h b/include/uapi/linux/wait.h
> index ac49a220cf2a..d6c7c0701997 100644
> --- a/include/uapi/linux/wait.h
> +++ b/include/uapi/linux/wait.h
> @@ -18,5 +18,7 @@
>  #define P_PID		1
>  #define P_PGID		2
>  
> +/* Get a file descriptor for /proc/<pid> of the corresponding pidfd
> */
> +#define PIDFD_GET_PROCFD _IOR('p', 1, int)
>  
>  #endif /* _UAPI_LINUX_WAIT_H */

This is missing an entry in Documentation/ioctl/ioctl-number.txt and is
actually conflicting with existing entries.

However, I'd actually prefer a syscall to allow strict whitelisting via
seccomp and avoid the other ioctl disadvantages that Daniel has already
mentioned.

Cheers,
Jürg