core: Fix user return notifier on fork()
fork() clones all thread_info flags, including
TIF_USER_RETURN_NOTIFY; if the new task is first scheduled on a cpu
which doesn't have user return notifiers set, this causes user
return notifiers to trigger without any way of clearing itself.
This is easy to trigger with a forky workload on the host in
parallel with kvm, resulting in a cpu in an endless loop on the
verge of returning to userspace.
Fix by dropping the TIF_USER_RETURN_NOTIFY immediately after fork.
Signed-off-by: Avi Kivity <avi@redhat.com>
LKML-Reference: <1259505288-16559-1-git-send-email-avi@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/linux/user-return-notifier.h b/include/linux/user-return-notifier.h
index b6ac056..9c4a445 100644
--- a/include/linux/user-return-notifier.h
+++ b/include/linux/user-return-notifier.h
@@ -26,6 +26,11 @@
void fire_user_return_notifiers(void);
+static inline void clear_user_return_notifier(struct task_struct *p)
+{
+ clear_tsk_thread_flag(p, TIF_USER_RETURN_NOTIFY);
+}
+
#else
struct user_return_notifier {};
@@ -37,6 +42,8 @@
static inline void fire_user_return_notifiers(void) {}
+static inline void clear_user_return_notifier(struct task_struct *p) {}
+
#endif
#endif
diff --git a/kernel/fork.c b/kernel/fork.c
index 266c6af..1b7512d 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -64,6 +64,7 @@
#include <linux/magic.h>
#include <linux/perf_event.h>
#include <linux/posix-timers.h>
+#include <linux/user-return-notifier.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
@@ -249,6 +250,7 @@
goto out;
setup_thread_stack(tsk, orig);
+ clear_user_return_notifier(tsk);
stackend = end_of_stack(tsk);
*stackend = STACK_END_MAGIC; /* for overflow detection */