From: tip-bot for Masami Hiramatsu <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: ast@kernel.org, ast@fb.com, mhiramat@kernel.org,
ananth@linux.vnet.ibm.com, mingo@kernel.org,
peterz@infradead.org, rostedt@goodmis.org,
linux-kernel@vger.kernel.org, torvalds@linux-foundation.org,
hpa@zytor.com, paulmck@linux.vnet.ibm.com, tglx@linutronix.de
Subject: [tip:perf/core] kprobes: Warn if optprobe handler tries to change execution path
Date: Thu, 28 Sep 2017 03:53:21 -0700 [thread overview]
Message-ID: <tip-e863d5396146411b615231cae0c518cb2a23371c@git.kernel.org> (raw)
In-Reply-To: <150581521955.32348.3615624715034787365.stgit@devbox>
Commit-ID: e863d5396146411b615231cae0c518cb2a23371c
Gitweb: https://git.kernel.org/tip/e863d5396146411b615231cae0c518cb2a23371c
Author: Masami Hiramatsu <mhiramat@kernel.org>
AuthorDate: Tue, 19 Sep 2017 19:00:19 +0900
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Thu, 28 Sep 2017 09:23:04 +0200
kprobes: Warn if optprobe handler tries to change execution path
Warn if optprobe handler tries to change execution path.
As described in Documentation/kprobes.txt, with optprobe
user handler can not change instruction pointer. In that
case user must avoid optimizing the kprobes by setting
post_handler or break_handler.
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
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/150581521955.32348.3615624715034787365.stgit@devbox
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
kernel/kprobes.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 15fba7f..2d28377 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -387,7 +387,10 @@ void opt_pre_handler(struct kprobe *p, struct pt_regs *regs)
list_for_each_entry_rcu(kp, &p->list, list) {
if (kp->pre_handler && likely(!kprobe_disabled(kp))) {
set_kprobe_instance(kp);
- kp->pre_handler(kp, regs);
+ if (kp->pre_handler(kp, regs)) {
+ if (WARN_ON_ONCE(1))
+ pr_err("Optprobe ignores instruction pointer changing.(%pF)\n", p->addr);
+ }
}
reset_kprobe_instance();
}
next prev parent reply other threads:[~2017-09-28 10:56 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-19 9:58 [PATCH -tip v3 0/7] kprobes/x86: Preempt related enhancements Masami Hiramatsu
2017-09-19 9:59 ` [PATCH -tip v3 1/7] kprobes: Improve smoke test to check preemptible Masami Hiramatsu
2017-09-28 10:52 ` [tip:perf/core] kprobes: Improve smoke test to check preemptibility tip-bot for Masami Hiramatsu
2017-09-19 9:59 ` [PATCH -tip v3 2/7] kprobes/x86: Move get_kprobe_ctlblk in irq-disabled block Masami Hiramatsu
2017-09-28 10:52 ` [tip:perf/core] kprobes/x86: Move the get_kprobe_ctlblk() into " tip-bot for Masami Hiramatsu
2017-09-19 10:00 ` [PATCH -tip v3 3/7] kprobes: Warn if optprobe handler tries to change execution path Masami Hiramatsu
2017-09-28 10:53 ` tip-bot for Masami Hiramatsu [this message]
2017-10-10 17:02 ` Naveen N. Rao
2017-10-12 5:04 ` Masami Hiramatsu
2017-10-17 8:05 ` Naveen N. Rao
2017-09-19 10:00 ` [PATCH -tip v3 4/7] kprobes/x86: Disable preempt in optprobe Masami Hiramatsu
2017-09-28 10:53 ` [tip:perf/core] kprobes/x86: Disable preemption " tip-bot for Masami Hiramatsu
2017-09-19 10:01 ` [PATCH -tip v3 5/7] kprobes/x86: Disable preempt ftrace-based jprobe Masami Hiramatsu
2017-09-28 10:54 ` [tip:perf/core] kprobes/x86: Disable preemption in ftrace-based jprobes tip-bot for Masami Hiramatsu
2017-09-19 10:02 ` [PATCH -tip v3 6/7] kprobes/x86: Remove disable_irq from ftrace-based/optimized kprobe Masami Hiramatsu
2017-09-28 7:25 ` Ingo Molnar
2017-09-29 6:48 ` Masami Hiramatsu
2017-09-28 10:54 ` [tip:perf/core] kprobes/x86: Remove IRQ disabling from ftrace-based/optimized kprobes tip-bot for Masami Hiramatsu
2017-09-19 10:03 ` [PATCH -tip v3 7/7] kprobes: Use synchronize_rcu_tasks() for optprobe with CONFIG_PREEMPT Masami Hiramatsu
2017-09-28 7:22 ` Ingo Molnar
2017-09-29 7:29 ` Masami Hiramatsu
2017-09-29 7:37 ` Ingo Molnar
2017-09-29 14:44 ` Masami Hiramatsu
2017-09-29 17:45 ` Ingo Molnar
2017-09-30 5:12 ` Masami Hiramatsu
2017-10-03 23:57 ` Steven Rostedt
2017-10-04 14:01 ` Masami Hiramatsu
2017-09-21 22:00 ` [PATCH -tip v3 0/7] kprobes/x86: Preempt related enhancements Alexei Starovoitov
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