linux-kernel - Re: [PATCH 1/1] stackleak: Disable ftrace for stackleak.c

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Message-ID: <20181110183011.2290fc20@gandalf.local.home>
Date:   Sat, 10 Nov 2018 18:30:11 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Alexander Popov <alex.popov@...ux.com>
Cc:     kernel-hardening@...ts.openwall.com,
        Kees Cook <keescook@...omium.org>,
        Jann Horn <jannh@...gle.com>, Ingo Molnar <mingo@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Joerg Roedel <joro@...tes.org>, Borislav Petkov <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>, Jan Kara <jack@...e.cz>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Masami Hiramatsu <mhiramat@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] stackleak: Disable ftrace for stackleak.c

On Sun, 11 Nov 2018 01:05:30 +0300
Alexander Popov <alex.popov@...ux.com> wrote:

> The stackleak_erase() function is called on the trampoline stack at the
> end of syscall. This stack is not big enough for ftrace operations,
> e.g. it can be overflowed if we enable kprobe_events for stackleak_erase().

Is the issue with kprobes or with function tracing? Because this stops
function tracing which I only want disabled if function tracing itself
is an issue, not for other things that may use the function tracing
infrastructure.

-- Steve