linux-kernel - Re: [PATCH v2 1/2] kprobes: Prohibit probing on CFI preamble symbol

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Message-ID: <20230728184913.27bb666f@rorschach.local.home>
Date:   Fri, 28 Jul 2023 18:49:13 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Petr Pavlu <petr.pavlu@...e.com>, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        hpa@...or.com, samitolvanen@...gle.com, x86@...nel.org,
        linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] kprobes: Prohibit probing on CFI preamble symbol

On Tue, 11 Jul 2023 10:50:47 +0900
"Masami Hiramatsu (Google)" <mhiramat@...nel.org> wrote:

> From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> 
> Do not allow to probe on "__cfi_" or "__pfx_" started symbol, because those
> are used for CFI and not executed. Probing it will break the CFI.
> 
> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>

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

-- Steve

> ---
>  Changes in v2:
>   - Check "__pfx_" prefix functions too.
>   - Make the check unconditional.
> ---
>  kernel/kprobes.c |   14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
>