freezer: prevent new tasks from inheriting TIF_FREEZE set

Tasks should go to the refrigerator only if explicitly requested to do that by
the freezer and not as a result of inheriting the TIF_FREEZE flag set from the
parent.  Make it happen.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Acked-by: Nigel Cunningham <nigel@nigel.suspend2.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/fork.c b/kernel/fork.c
index 490495a..7e455a9 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -942,6 +942,7 @@ static inline void copy_flags(unsigned long clone_flags, struct task_struct *p)
        if (!(clone_flags & CLONE_PTRACE))
                p->ptrace = 0;
        p->flags = new_flags;
+       clear_freeze_flag(p);
 }
 
 asmlinkage long sys_set_tid_address(int __user *tidptr)