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

Lakshmi Ramasubramanian
2020-08-13T17:52:10Z

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