Re: [PATCH V2] x86/ftrace: Make sure that ftrace trampolines are not RWX

[Steven Rostedt]

On Thu, 25 May 2017 10:57:51 +0200 (CEST)
Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:

> ftrace use module_alloc() to allocate trampoline pages. The mapping of
> module_alloc() is RWX, which makes sense as the memory is written to
> right after allocation. But nothing makes these pages RO after
> writing to them.
> 
> Add proper set_memory_rw/ro() calls to protect the trampolines after
> modification.
> 
> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

OK, I pulled this in and I'm currently running it through my test
suite. I'm about to board a flight, hopefully it runs smoothly and will
finish by the time I get home.

-- Steve