linux-kernel - Re: [PATCH] ftrace: fix kmemleak in unregister_ftrace

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Date:   Tue, 3 Oct 2017 10:29:54 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Shu Wang <shuwang@...hat.com>
Cc:     mingo@...hat.com, chuhu@...hat.com, liwang@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ftrace: fix kmemleak in unregister_ftrace_graph

On Tue, 26 Sep 2017 08:01:26 -0400 (EDT)
Shu Wang <shuwang@...hat.com> wrote:

> > From: shuwang@...hat.com
> > To: rostedt@...dmis.org, mingo@...hat.com
> > Cc: chuhu@...hat.com, liwang@...hat.com, linux-kernel@...r.kernel.org, "Shu Wang" <shuwang@...hat.com>
> > Sent: Tuesday, September 12, 2017 10:14:54 AM
> > Subject: [PATCH] ftrace: fix kmemleak in unregister_ftrace_graph
> > 
> > From: Shu Wang <shuwang@...hat.com>
> > 
> > The trampoline allocated by function tracer was
> > overwrite by function_graph tracer, and cause
> > memory leak. The save_global_trampoline should
> > save previous trampoline in register_ftrace_graph
> > and restore it in unregister_ftrace_graph. But
> > as it implemented, save_global_trampoline was only
> > used in unregister_ftrace_graph as default value 0,
> > and overwrite the previous trampoline's value.
> > 
> > kmmeleak backtrace:
> >     kmemleak_vmalloc+0x77/0xc0
> >     __vmalloc_node_range+0x1b5/0x2c0
> >     module_alloc+0x7c/0xd0
> >     arch_ftrace_update_trampoline+0xb5/0x290
> >     ftrace_startup+0x78/0x210
> >     register_ftrace_function+0x8b/0xd0
> >     function_trace_init+0x4f/0x80
> >     tracing_set_tracer+0xe6/0x170
> >     tracing_set_trace_write+0x90/0xd0
> >     __vfs_write+0x37/0x170
> >     vfs_write+0xb2/0x1b0
> >     SyS_write+0x55/0xc0
> >     do_syscall_64+0x67/0x180
> >     return_from_SYSCALL_64+0x0/0x6a
> > 
> > Signed-off-by: Shu Wang <shuwang@...hat.com>



> >   
> 
> ping


Thanks for the reminder. I pulled it in and will send this out to Linus
after the testing finishes. I also marked it for stable.

-- Steve