linux-kernel - Re: [PATCH -tip v3 05/10] kprobes: Search non-suffixed symbol in blacklist

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Date:   Thu, 14 Feb 2019 08:44:58 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Ingo Molnar <mingo@...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>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH -tip v3 05/10] kprobes: Search non-suffixed symbol in
 blacklist

On Wed, 13 Feb 2019 08:17:11 +0100
Ingo Molnar <mingo@...nel.org> wrote:

> 
> * Ingo Molnar <mingo@...nel.org> wrote:
> 
> > 
> > * 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>
> > 
> > Why did you not add Steven's Reviewed-by tag?
> 
> The series looks fine otherwise, so I applied it with Steve's reviewed-by 
> tag added.


Oops, sorry! I missed to add that. :-(

Thank you,

> 
> Thanks,
> 
> 	Ingo


-- 
Masami Hiramatsu <mhiramat@...nel.org>