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kprobes: Use synchronize_rcu_tasks() for optprobe with CONFIG_PREEMPT=y

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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 <[email protected]>
Acked-by: Paul E. McKenney <[email protected]>
Cc: Ananth N Mavinakayanahalli <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Naveen N . Rao <[email protected]>
Cc: Paul E . McKenney <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/150845661962.5443.17724352636247312231.stgit@devbox
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Masami Hiramatsu 2017-10-20 08:43:39 +09:00 • committed by Ingo Molnar
commit a30b85df7d
2 changed files with 9 additions and 7 deletions
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2
arch/Kconfig
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@ -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