linux-kernel - Re: [RFC] [PATCH] selective signal ptracing

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Message-ID: <20070616092415.GA130@tv-sign.ru>
Date:	Sat, 16 Jun 2007 13:24:15 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	John Blackwood <john.blackwood@...r.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] [PATCH] selective signal ptracing

John Blackwood wrote:
>
> By default all signals are ptraced as before. However, a debugger
> may now modify the set of per-task ptraced signals, where only the
> signals in this ptrace signal mask will be ptraced.

I must admit, I agree with Roland...

> +void ptrace_update_traced_signals(struct task_struct *child,
> +							sigset_t *new_smaskp)
> +{
> [...snip...]
> +
> +		spin_lock_irqsave(&child->sighand->siglock, flags);
> +
> +		if (child->sighand == NULL) {

How so?

Oleg.

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