linux-kernel - Re: [PATCH v2 5/9] kprobes: Search non-suffixed symbol in blacklist

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Message-ID: <20190114111657.639a3bf8@gandalf.local.home>
Date:   Mon, 14 Jan 2019 11:16:57 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Ingo Molnar <mingo@...hat.com>, peterz@...radead.org,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Andrea Righi <righi.andrea@...il.com>
Subject: Re: [PATCH v2 5/9] kprobes: Search non-suffixed symbol in blacklist

On Sat, 12 Jan 2019 11:28:02 +0900
Masami Hiramatsu <mhiramat@...nel.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@...nel.org>

Reviewed-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

-- Steve