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Date: Tue, 17 Oct 2017 20:35:16 -0400
From: Steven Rostedt <>
To: "Tobin C. Harding" <>
Cc:, Linus Torvalds
 <>, Kees Cook <>, Paolo
 Bonzini <>, Tycho Andersen <>, "Roberts,
 William C" <>, Tejun Heo <>, Jordan
 Glover <>, Greg KH
 <>, Petr Mladek <>, Joe Perches
 <>, Ian Campbell <>, Sergey Senozhatsky
 <>, Catalin Marinas <>,
 Will Deacon <>, Chris Fries <>, Dave
 Weinstein <>, Daniel Micay <>, Djalal
 Harouni <>,
Subject: Re: [PATCH v2] printk: hash addresses printed with %p

On Wed, 18 Oct 2017 10:15:59 +1100
"Tobin C. Harding" <> wrote:

> > Does %p[FfSs] leak addresses? Well, I guess it does if they are not
> > found in kallsyms, but otherwise you have:
> > 
> >   function+0x<offset>  
> You are correct %pF and %pS print an offset. Does this provide an attack vector,
> I didn't think so but I'm no security expert. If they do then we need to amend
> those calls also.

Hopefully not. We changed stack dumps to use them only instead of
showing addresses because of the location leak.

-- Steve

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