linux-kernel - [ PATCH 1/1 ] coredump: use current->group

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Date:	Thu, 1 Sep 2011 10:01:39 -0700
From:	Earl Chew <echew@...acom.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	<alan@...rguk.ukuu.org.uk>, <viro@...iv.linux.org.uk>,
	<andi@...stfloor.org>, <oleg@...hat.com>
Subject: [ PATCH 1/1 ] coredump: use current->group_leader->comm instead of
 current->comm

Change corepattern %e and %E to use current->group_leader->comm instead of current->comm.

Multithreaded processes can use PR_SET_NAME (or the corresponding pthread_setname_np)
to configure the name of each thread.

A core dump can be triggered from any task in a group, and substituting current->comm
means that the name of the core file for a process can vary in surprising ways.

Using current->group_leader->comm makes the name of the core file more consistent
for a process when used with %e or %E.

Signed-off-by: Earl Chew <echew@...acom.com>
Cc: Alan Cox <alan@...rguk.ukuu.org.uk>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Andi Kleen <andi@...stfloor.org>
Cc: Oleg Nesterov <oleg@...hat.com>
--
--- fs/exec.c.orig	2011-08-28 21:16:01.000000000 -0700
+++ fs/exec.c	2011-09-01 09:58:42.032116998 -0700
@@ -1679,7 +1679,8 @@ static int cn_print_exe_file(struct core
 	exe_file = get_mm_exe_file(current->mm);
 	if (!exe_file) {
 		char *commstart = cn->corename + cn->used;
-		ret = cn_printf(cn, "%s (path unknown)", current->comm);
+		ret = cn_printf(cn, "%s (path unknown)",
+				current->group_leader->comm);
 		cn_escape(commstart);
 		return ret;
 	}
@@ -1780,7 +1781,8 @@ static int format_corename(struct core_n
 			/* executable */
 			case 'e': {
 				char *commstart = cn->corename + cn->used;
-				err = cn_printf(cn, "%s", current->comm);
+				err = cn_printf(cn, "%s",
+					      current->group_leader->comm);
 				cn_escape(commstart);
 				break;
 			}

--
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