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Message-ID: <CAHC9VhTGrqO4dLXbqSK0PjrwUCg7VuBoJkce2685ZkpfbZkUEg@mail.gmail.com>
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
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