linux-kernel - [RFC][PATCH] SEND_SIG_NOINFO: Set si

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Message-ID: <20081217020601.GB2866@us.ibm.com>
Date:	Tue, 16 Dec 2008 18:06:01 -0800
From:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:	oleg@...hat.com, ebiederm@...ssion.com, roland@...hat.com
Cc:	daniel@...ac.com, bastian@...di.eu.org, xemul@...nvz.org,
	containers@...ts.osdl.org, linux-kernel@...r.kernel.org
Subject: [RFC][PATCH] SEND_SIG_NOINFO: Set si_pid to tgid instead of pid


From: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Date: Tue, 16 Dec 2008 17:07:17 -0800
Subject: [PATCH] SEND_SIG_NOINFO: Set si_pid to tgid instead of pid

POSIX requires the si_pid to be the process id of the sender, so ->si_pid
should really be set to 'tgid'. This change does have following changes
in behavior:

	- When sending pdeath_signal on re-parent to a sub-thread, ->si_pid
	  cannot be used to identify the thread that did the re-parent since
	  it will now show the tgid instead of thread id.

	- A multi-threaded application that expects to find the specific
	  thread that encountered a SIGPIPE using the ->si_pid will now
	  break.

Signed-off-by: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
---
 kernel/signal.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/signal.c b/kernel/signal.c
index d11e5f8..700d767 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -856,7 +856,7 @@ static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
 			q->info.si_signo = sig;
 			q->info.si_errno = 0;
 			q->info.si_code = SI_USER;
-			q->info.si_pid = task_pid_nr_ns(current,
+			q->info.si_pid = task_tgid_nr_ns(current,
 							task_active_pid_ns(t));
 			q->info.si_uid = current_uid();
 			break;
-- 
1.5.2.5

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