linux-kernel - Re: [PATCH v3] Make PTRACE_SEIZE set ptrace options specified in 'data'

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Date:	Fri, 9 Sep 2011 19:18:32 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Pedro Alves <pedro@...esourcery.com>
Cc:	Denys Vlasenko <dvlasenk@...hat.com>, Tejun Heo <tj@...nel.org>,
	linux-kernel@...r.kernel.org,
	Denys Vlasenko <vda.linux@...glemail.com>
Subject: Re: [PATCH v3] Make PTRACE_SEIZE set ptrace options specified in
	'data'

On 09/09, Pedro Alves wrote:
>
> WTH?  I'm talking about _not forcing the tracee to stop_.

The patch is trivial.

And personally I agree, this looks like a cleanup to me.

Oleg.

--- x/include/linux/ptrace.h
+++ x/include/linux/ptrace.h
@@ -199,7 +199,8 @@ static inline void ptrace_event(int even
 		ptrace_notify((event << 8) | SIGTRAP);
 	} else if (event == PTRACE_EVENT_EXEC && unlikely(current->ptrace)) {
 		/* legacy EXEC report via SIGTRAP */
-		send_sig(SIGTRAP, current, 0);
+		if (!(current->ptrace & PT_SEIZED))
+			send_sig(SIGTRAP, current, 0);
 	}
 }
 

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