Re: [PATCH 2/2] SELinux: Measure state and hash of policy using IMA

[Lakshmi Ramasubramanian <nramas@xxxxxxxxxxxxxxxxxxx>]

On 8/13/20 10:42 AM, Stephen Smalley wrote:

> > diff --git a/security/selinux/measure.c b/security/selinux/measure.c
> > new file mode 100644
> > index 000000000000..f21b7de4e2ae
> > --- /dev/null
> > +++ b/security/selinux/measure.c
> > @@ -0,0 +1,204 @@
> > +static int selinux_hash_buffer(void *buf, size_t buf_len,
> > +                   void **buf_hash, int *buf_hash_len)
> > +{
> > +    struct crypto_shash *tfm;
> > +    struct shash_desc *desc = NULL;
> > +    void *digest = NULL;
> > +    int desc_size;
> > +    int digest_size;
> > +    int ret = 0;
> > +
> > +    tfm = crypto_alloc_shash("sha256", 0, 0);
> > +    if (IS_ERR(tfm))
> > +        return PTR_ERR(tfm);
> Can we make the algorithm selectable via kernel parameter and/or writing 
> to a new selinuxfs node?

I can add a kernel parameter to select this hash algorithm.

 -lakshmi