From: Steven Rostedt <rostedt@goodmis.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Kees Cook <keescook@chromium.org>,
LKML <linux-kernel@vger.kernel.org>,
x86@kernel.org, Masami Hiramatsu <mhiramat@kernel.org>,
"Luis R. Rodriguez" <mcgrof@kernel.org>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: [WARNING] x86/mm: Found insecure W+X mapping at address ..
Date: Tue, 23 May 2017 18:59:12 -0400 [thread overview]
Message-ID: <20170523185912.05346057@vmware.local.home> (raw)
In-Reply-To: <alpine.DEB.2.20.1705232243520.2409@nanos>
On Tue, 23 May 2017 22:48:19 +0200 (CEST)
Thomas Gleixner <tglx@linutronix.de> wrote:
> It's not KPROBES, it's the new fangled ftrace trampoline code. I
> added a few printks. All the leaked W+X mappings are allocated via
> this callchain:
The trampoline code isn't new. But it has new users because of the
introduction to synchronize_rcu_tasks(), and there was a bug I fixed in
-rc2 that moved it down because the test was run before
synchronize_rcu_tasks() was functional.
Is this still a bug in rc2?
-- Steve
>
> [ 2.620465] module_alloc+0x8e/0xa0
> [ 2.620764] ? __fentry__+0x10/0x10
> [ 2.621049] arch_ftrace_update_trampoline+0x9f/0x220
> [ 2.621453] ? ftrace_caller+0x64/0x64
> [ 2.621754] ? __fentry__+0x10/0x10
> [ 2.622047] ftrace_startup+0x90/0x200
> [ 2.622352] register_ftrace_function+0x50/0x70
> [ 2.622725] function_trace_init+0x6d/0xa0
> [ 2.623057] trace_selftest_startup_function+0x63/0x4a8
> [ 2.623477] run_tracer_selftest+0xfe/0x16c
> [ 2.623813] init_trace_selftests+0x5d/0x103
> [ 2.624163] ? set_tracepoint_printk+0x3d/0x3d
> [ 2.624525] do_one_initcall+0x44/0x170
> [ 2.624845] kernel_init_freeable+0x1ff/0x287
> [ 2.625199] ? rest_init+0x140/0x140
> [ 2.625491] kernel_init+0xe/0x110
> [ 2.625775] ret_from_fork+0x2e/0x40
>
> Thanks,
>
> tglx
next prev parent reply other threads:[~2017-05-23 22:59 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-23 15:40 [WARNING] x86/mm: Found insecure W+X mapping at address Thomas Gleixner
2017-05-23 15:54 ` Kees Cook
2017-05-23 16:35 ` Thomas Gleixner
2017-05-23 20:48 ` Thomas Gleixner
2017-05-23 22:59 ` Steven Rostedt [this message]
2017-05-24 6:20 ` Thomas Gleixner
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