From: Masami Hiramatsu <mhiramat@kernel.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Alexander Popov <alex.popov@linux.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
kernel-hardening@lists.openwall.com,
Kees Cook <keescook@chromium.org>, Jann Horn <jannh@google.com>,
Ingo Molnar <mingo@kernel.org>, Andy Lutomirski <luto@kernel.org>,
Joerg Roedel <joro@8bytes.org>, Borislav Petkov <bp@alien8.de>,
Thomas Gleixner <tglx@linutronix.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
Peter Zijlstra <peterz@infradead.org>, Jan Kara <jack@suse.cz>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Dan Williams <dan.j.williams@intel.com>,
Masahiro Yamada <yamada.masahiro@socionext.com>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/1] stackleak: Disable ftrace for stackleak.c
Date: Tue, 13 Nov 2018 10:21:45 -0800 [thread overview]
Message-ID: <20181113102145.2274aedc6f9edaba681bfd3a@kernel.org> (raw)
In-Reply-To: <20181112122148.0fab4c7f@vmware.local.home>
On Mon, 12 Nov 2018 12:21:48 -0500
Steven Rostedt <rostedt@goodmis.org> wrote:
> On Mon, 12 Nov 2018 19:51:00 +0300
> Alexander Popov <alex.popov@linux.com> wrote:
>
> > By the way, are there any other tracing/instrumentation mechanisms that should
> > be disabled?
>
> ftrace and kprobes are pretty much the only ones that currently do self
> modification of code all over the kernel. Kprobes even more so than
> ftrace.
Right, since kprobes uses int3 or sw breakpoint exception for hooking into
the code, it consumes stack much more.
Thank you,
--
Masami Hiramatsu <mhiramat@kernel.org>
prev parent reply other threads:[~2018-11-13 18:21 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-10 22:05 [PATCH 1/1] stackleak: Disable ftrace for stackleak.c Alexander Popov
2018-11-10 23:30 ` Steven Rostedt
2018-11-11 10:19 ` Alexander Popov
2018-11-12 1:53 ` Steven Rostedt
2018-11-12 2:50 ` Masami Hiramatsu
2018-11-12 14:53 ` Mathieu Desnoyers
2018-11-12 16:52 ` Steven Rostedt
2018-11-12 16:51 ` Alexander Popov
2018-11-12 17:21 ` Steven Rostedt
2018-11-13 18:21 ` Masami Hiramatsu [this message]
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