On 8/13/20 10:58 AM, Stephen Smalley wrote:
On Thu, Aug 13, 2020 at 1:52 PM Lakshmi Ramasubramanian
<nramas@xxxxxxxxxxxxxxxxxxx> wrote:
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.
Also can we provide a Kconfig option for the default value like IMA does?
Would we need both - Kconfig and kernel param?
The other option is to provide an IMA function to return the current
hash algorithm used for measurement. That way a consistent hash
algorithm can be employed by both IMA and the callers. Would that be better?
-lakshmi
