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From: Ingo Molnar <mingo@kernel.org>
To: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>,
	peterz@infradead.org,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Andrea Righi <righi.andrea@gmail.com>,
	Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [PATCH -tip v3 05/10] kprobes: Search non-suffixed symbol in blacklist
Date: Wed, 13 Feb 2019 08:13:16 +0100	[thread overview]
Message-ID: <20190213071316.GA121801@gmail.com> (raw)
In-Reply-To: <154998799234.31052.6136378903570418008.stgit@devbox>


* Masami Hiramatsu <mhiramat@kernel.org> wrote:

> Newer gcc can generate some different instances of a function
> with suffixed symbols if the function is optimized and only
> has a part of that. (e.g. .constprop, .part etc.)
> 
> In this case, it is not enough to check the entry of kprobe
> blacklist because it only records non-suffixed symbol address.
> 
> To fix this issue, search non-suffixed symbol in blacklist if
> given address is within a symbol which has a suffix.
> 
> Note that this can cause false positive cases if a kprobe-safe
> function is optimized to suffixed instance and has same name
> symbol which is blacklisted.
> But I would like to chose a fail-safe design for this issue.
> 
> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>

Why did you not add Steven's Reviewed-by tag?

Thanks,

	Ingo

  reply	other threads:[~2019-02-13  7:13 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-12 16:10 [PATCH -tip v3 00/10] kprobes: Fix and improve blacklist symbols Masami Hiramatsu
2019-02-12 16:11 ` [PATCH -tip v3 01/10] x86/kprobes: Prohibit probing on optprobe template code Masami Hiramatsu
2019-02-13  8:58   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2019-02-12 16:11 ` [PATCH -tip v3 02/10] x86/kprobes: Move trampoline code into RODATA Masami Hiramatsu
2019-02-13  8:59   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2019-02-12 16:12 ` [PATCH -tip v3 03/10] x86/kprobes: Prohibit probing on functions before kprobe_int3_handler() Masami Hiramatsu
2019-02-13  9:00   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2019-02-12 16:12 ` [PATCH -tip v3 04/10] x86/kprobes: Prohibit probing on IRQ handlers directly Masami Hiramatsu
2019-02-13  9:00   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2019-03-25 21:23   ` [PATCH -tip v3 04/10] " Steven Rostedt
2019-03-26 14:50     ` Masami Hiramatsu
2019-03-26 15:17       ` Andrea Righi
2019-02-12 16:13 ` [PATCH -tip v3 05/10] kprobes: Search non-suffixed symbol in blacklist Masami Hiramatsu
2019-02-13  7:13   ` Ingo Molnar [this message]
2019-02-13  7:17     ` Ingo Molnar
2019-02-13 13:43       ` Steven Rostedt
2019-02-13 23:44       ` Masami Hiramatsu
2019-02-13  9:01   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2019-02-12 16:13 ` [PATCH -tip v3 06/10] kprobes: Prohibit probing on hardirq tracers Masami Hiramatsu
2019-02-13  9:02   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2019-02-12 16:14 ` [PATCH -tip v3 07/10] kprobes: Prohibit probing on preempt_check debug functions Masami Hiramatsu
2019-02-13  9:02   ` [tip:perf/core] kprobes: Prohibit probing on preemption checking " tip-bot for Masami Hiramatsu
2019-02-12 16:14 ` [PATCH -tip v3 08/10] kprobes: Prohibit probing on RCU debug routine Masami Hiramatsu
2019-02-13  9:03   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2019-02-12 16:15 ` [PATCH -tip v3 09/10] kprobes: Prohibit probing on lockdep functions Masami Hiramatsu
2019-02-13  9:03   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2019-02-12 16:15 ` [PATCH -tip v3 10/10] kprobes: Prohibit probing on bsearch() Masami Hiramatsu
2019-02-13  9:04   ` [tip:perf/core] " tip-bot for Andrea Righi

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