capabilities: introduce security_capable_noaudit
Exactly like security_capable except don't audit any denials. This is for
places where the kernel may make decisions about what to do if a task has a
given capability, but which failing that capability is not a sign of a
security policy violation. An example is checking if a task has
CAP_SYS_ADMIN to lower it's likelyhood of being killed by the oom killer.
This check is not a security violation if it is denied.
Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Serge E. Hallyn <serge.hallyn@canonical.com>
diff --git a/include/linux/security.h b/include/linux/security.h
index ee969ff..caff54e 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -1668,6 +1668,8 @@
const kernel_cap_t *permitted);
int security_capable(const struct cred *cred, struct user_namespace *ns,
int cap);
+int security_capable_noaudit(const struct cred *cred, struct user_namespace *ns,
+ int cap);
int security_real_capable(struct task_struct *tsk, struct user_namespace *ns,
int cap);
int security_real_capable_noaudit(struct task_struct *tsk,
@@ -1869,6 +1871,11 @@
return cap_capable(cred, ns, cap, SECURITY_CAP_AUDIT);
}
+static inline int security_capable_noaudit(const struct cred *cred,
+ struct user_namespace *ns, int cap) {
+ return cap_capable(cred, ns, cap, SECURITY_CAP_NOAUDIT);
+}
+
static inline int security_real_capable(struct task_struct *tsk, struct user_namespace *ns, int cap)
{
int ret;
diff --git a/security/security.c b/security/security.c
index b9e57f4..b7edaae 100644
--- a/security/security.c
+++ b/security/security.c
@@ -160,6 +160,12 @@
return security_ops->capable(cred, ns, cap, SECURITY_CAP_AUDIT);
}
+int security_capable_noaudit(const struct cred *cred, struct user_namespace *ns,
+ int cap)
+{
+ return security_ops->capable(cred, ns, cap, SECURITY_CAP_NOAUDIT);
+}
+
int security_real_capable(struct task_struct *tsk, struct user_namespace *ns,
int cap)
{