linux-kernel - Re: [PATCH V2] audit: add tty field to LOGIN event

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Date:	Wed, 20 Apr 2016 21:44:37 -0400
From:	Paul Moore <paul@...l-moore.com>
To:	Richard Guy Briggs <rgb@...hat.com>
Cc:	linux-audit@...hat.com, linux-kernel@...r.kernel.org,
	peter@...leysoftware.com
Subject: Re: [PATCH V2] audit: add tty field to LOGIN event

On Wed, Apr 20, 2016 at 7:31 PM, Richard Guy Briggs <rgb@...hat.com> wrote:
> diff --git a/include/linux/audit.h b/include/linux/audit.h
> index b40ed5d..b00beef 100644
> --- a/include/linux/audit.h
> +++ b/include/linux/audit.h
> @@ -26,6 +26,7 @@
>  #include <linux/sched.h>
>  #include <linux/ptrace.h>
>  #include <uapi/linux/audit.h>
> +#include <linux/tty.h>
>
>  #define AUDIT_INO_UNSET ((unsigned long)-1)
>  #define AUDIT_DEV_UNSET ((dev_t)-1)
> @@ -343,6 +344,18 @@ static inline unsigned int audit_get_sessionid(struct task_struct *tsk)
>         return tsk->sessionid;
>  }
>
> +static inline struct tty_struct *audit_get_tty(struct task_struct *tsk)
> +{
> +       struct tty_struct *tty = NULL;
> +       unsigned long flags;
> +
> +       spin_lock_irqsave(&tsk->sighand->siglock, flags);
> +       if (tsk->signal)
> +               tty = tty_kref_get(tsk->signal->tty);
> +       spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
> +       return tty;
> +}

I'll look at this patch closer tomorrow, but one thing jumped out at
me just now: we should probably have a audit_put_tty(...) to match the
audit_get_tty(...).  It seems more obvious than trying to match
audit_get_tty() and tty_kref_put() in a function.

-- 
paul moore
www.paul-moore.com