crypto: prng - Deterministic CPRNG

[pandora-kernel.git] / kernel / capability.c

diff --git a/kernel/capability.c b/kernel/capability.c
index cfbe442..901e0fd 100644 (file)
--- a/kernel/capability.c
+++ b/kernel/capability.c
@@ -121,6 +121,27 @@ static int cap_validate_magic(cap_user_header_t header, unsigned *tocopy)
  * uninteresting and/or not to be changed.
  */
 
+/*
+ * Atomically modify the effective capabilities returning the original
+ * value. No permission check is performed here - it is assumed that the
+ * caller is permitted to set the desired effective capabilities.
+ */
+kernel_cap_t cap_set_effective(const kernel_cap_t pE_new)
+{
+       kernel_cap_t pE_old;
+
+       spin_lock(&task_capability_lock);
+
+       pE_old = current->cap_effective;
+       current->cap_effective = pE_new;
+
+       spin_unlock(&task_capability_lock);
+
+       return pE_old;
+}
+
+EXPORT_SYMBOL(cap_set_effective);
+
 /**
  * sys_capget - get the capabilities of a given process.
  * @header: pointer to struct that contains capability version and