KASAN: slab-out-of-bounds Read in strcmp

[James Morris]

On Sun, 3 Dec 2017, Tetsuo Handa wrote:

> Tetsuo Handa wrote:
> > which will allow strcmp() to trigger out of bound read when "size" is
> > larger than strlen(initial_sid_to_string[i]).
> 
> Oops. "smaller" than.
> 
> > 
> > Thus, I guess the simplest fix is to use strncmp() instead of strcmp().
> 
> Can somebody test below patch? (My CentOS 7 environment does not support
> enabling SELinux in linux.git . Userspace tool is too old to support?)

You mean enabling KASAN?  Yep, you need gcc 4.9.2 or better.  Recent 
Fedora has it.


-- 
James Morris
<james.l.morris at oracle.com>

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