From 3e7cd6c413c9e6fbb5e1ee2acdadb4ababd2d474 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Mon, 12 Feb 2007 00:52:58 -0800 Subject: [PATCH] pid: replace is_orphaned_pgrp with is_current_pgrp_orphaned Every call to is_orphaned_pgrp passed in process_group(current) which is racy with respect to another thread changing our process group. It didn't bite us because we were dealing with integers and the worse we would get would be a stale answer. In switching the checks to use struct pid to be a little more efficient and prepare the way for pid namespaces this race became apparent. So I simplified the calls to the more specialized is_current_pgrp_orphaned so I didn't have to worry about making logic changes to avoid the race. Signed-off-by: Eric W. Biederman Cc: Alan Cox Cc: Oleg Nesterov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/exit.c | 4 ++-- kernel/signal.c | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) (limited to 'kernel') diff --git a/kernel/exit.c b/kernel/exit.c index 407b80aaefd..f132349c032 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -229,12 +229,12 @@ static int will_become_orphaned_pgrp(struct pid *pgrp, struct task_struct *ignor return ret; /* (sighing) "Often!" */ } -int is_orphaned_pgrp(int pgrp) +int is_current_pgrp_orphaned(void) { int retval; read_lock(&tasklist_lock); - retval = will_become_orphaned_pgrp(find_pid(pgrp), NULL); + retval = will_become_orphaned_pgrp(task_pgrp(current), NULL); read_unlock(&tasklist_lock); return retval; diff --git a/kernel/signal.c b/kernel/signal.c index de66def7164..a9b679ed795 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -1909,7 +1909,7 @@ relock: /* signals can be posted during this window */ - if (is_orphaned_pgrp(process_group(current))) + if (is_current_pgrp_orphaned()) goto relock; spin_lock_irq(¤t->sighand->siglock); -- cgit v1.2.3-18-g5258