From: Masami Hiramatsu <mhiramat@kernel.org>
Date: Fri, 20 Oct 2017 08:43:39 +0900
Subject: kprobes: Use synchronize_rcu_tasks() for optprobe with
CONFIG_PREEMPT=y
Git-commit: a30b85df7d599f626973e9cd3056fe755bd778e0
Patch-mainline: v4.15-rc1
References: git-fixes
We want to wait for all potentially preempted kprobes trampoline
execution to have completed. This guarantees that any freed
trampoline memory is not in use by any task in the system anymore.
synchronize_rcu_tasks() gives such a guarantee, so use it.
Also, this guarantees to wait for all potentially preempted tasks
on the instructions which will be replaced with a jump.
Since this becomes a problem only when CONFIG_PREEMPT=y, enable
CONFIG_TASKS_RCU=y for synchronize_rcu_tasks() in that case.
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Naveen N . Rao <naveen.n.rao@linux.vnet.ibm.com>
Cc: Paul E . McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/150845661962.5443.17724352636247312231.stgit@devbox
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Petr Pavlu <petr.pavlu@suse.com>
---
arch/Kconfig | 2 +-
kernel/kprobes.c | 14 ++++++++------
2 files changed, 9 insertions(+), 7 deletions(-)
diff --git a/arch/Kconfig b/arch/Kconfig
index 1aafb4efbb51..f75c8e8a229b 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -90,7 +90,7 @@ config STATIC_KEYS_SELFTEST
config OPTPROBES
def_bool y
depends on KPROBES && HAVE_OPTPROBES
- depends on !PREEMPT
+ select TASKS_RCU if PREEMPT
config KPROBES_ON_FTRACE
def_bool y
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 15fba7fe57c8..a8fc1492b308 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -573,13 +573,15 @@ static void kprobe_optimizer(struct work_struct *work)
do_unoptimize_kprobes();
/*
- * Step 2: Wait for quiesence period to ensure all running interrupts
- * are done. Because optprobe may modify multiple instructions
- * there is a chance that Nth instruction is interrupted. In that
- * case, running interrupt can return to 2nd-Nth byte of jump
- * instruction. This wait is for avoiding it.
+ * Step 2: Wait for quiesence period to ensure all potentially
+ * preempted tasks to have normally scheduled. Because optprobe
+ * may modify multiple instructions, there is a chance that Nth
+ * instruction is preempted. In that case, such tasks can return
+ * to 2nd-Nth byte of jump instruction. This wait is for avoiding it.
+ * Note that on non-preemptive kernel, this is transparently converted
+ * to synchronoze_sched() to wait for all interrupts to have completed.
*/
- synchronize_sched();
+ synchronize_rcu_tasks();
/* Step 3: Optimize kprobes after quiesence period */
do_optimize_kprobes();