linux-kernel - Re: [PATCH v2 1/4] pidfd: support PIDFD_NONBLOCK in pidfd

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Date:   Thu, 3 Sep 2020 16:31:25 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     linux-kernel@...r.kernel.org,
        Christian Brauner <christian@...uner.io>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Kees Cook <keescook@...omium.org>,
        Sargun Dhillon <sargun@...gun.me>,
        Aleksa Sarai <cyphar@...har.com>,
        linux-kselftest@...r.kernel.org,
        Josh Triplett <josh@...htriplett.org>,
        Jens Axboe <axboe@...nel.dk>, linux-api@...r.kernel.org
Subject: Re: [PATCH v2 1/4] pidfd: support PIDFD_NONBLOCK in pidfd_open()

On 09/02, Christian Brauner wrote:
>
> -static int pidfd_create(struct pid *pid)
> +static int pidfd_create(struct pid *pid, unsigned int flags)
>  {
>  	int fd;
>  
>  	fd = anon_inode_getfd("[pidfd]", &pidfd_fops, get_pid(pid),
> -			      O_RDWR | O_CLOEXEC);
> +			      flags | O_RDWR | O_CLOEXEC);
>  	if (fd < 0)
>  		put_pid(pid);
>  
> @@ -565,7 +567,7 @@ SYSCALL_DEFINE2(pidfd_open, pid_t, pid, unsigned int, flags)
>  	int fd;
>  	struct pid *p;
>  
> -	if (flags)
> +	if (flags & ~PIDFD_NONBLOCK)
>  		return -EINVAL;
>  
>  	if (pid <= 0)
> @@ -576,7 +578,7 @@ SYSCALL_DEFINE2(pidfd_open, pid_t, pid, unsigned int, flags)
>  		return -ESRCH;
>  
>  	if (pid_has_task(p, PIDTYPE_TGID))
> -		fd = pidfd_create(p);
> +		fd = pidfd_create(p, flags);
>  	else
>  		fd = -EINVAL;
>  

Reviewed-by: Oleg Nesterov <oleg@...hat.com>