Re: [kernel-hardening] Re: [PATCH 3.18 01/33] Revert "stackprotector: Increase the per-task stack canarys random range from 32 bits to 64 bits on 64-bit platforms"

[Eric Biggers]

On Mon, Jun 05, 2017 at 12:13:11PM -0700, Kees Cook wrote:
> On Mon, Jun 5, 2017 at 9:16 AM, Greg Kroah-Hartman
> <gregkh@xxxxxxxxxxxxxxxxxxx> wrote:
> > 3.18-stable review patch.  If anyone has any objections, please let me know.
> >
> > ------------------
> >
> > From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> >
> > This reverts commit 609a3e81550b0b4ea87197b0f59455a7bcff975a which is
> > commit 5ea30e4e58040cfd6434c2f33dc3ea76e2c15b05 upstream.
> >
> > It shouldn't have been backported to 3.18, as we do not have
> > get_random_long() in that kernel tree.
> 
> It should be possible to trivially backport
> ec9ee4acd97c0039a61c0ae4f12705767ae62153 to gain get_random_long().
> 
> -Kees

If that's done it may be a good idea to take
b1132deac01c2332d234fa821a70022796b79182 as well, which fixed an alignment bug
in get_random_long().

Eric