Standalone audit records have the timestamp and serial number generated
on the fly and as such are unique, making them standalone.  This new
function audit_alloc_local() generates a local audit context that will
be used only for a standalone record and its auxiliary record(s).  The
context is discarded immediately after the local associated records are
produced.

Signed-off-by: Richard Guy Briggs <redacted>
---
 include/linux/audit.h |  8 ++++++++
 kernel/auditsc.c      | 20 +++++++++++++++++++-
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/include/linux/audit.h b/include/linux/audit.h
index ed16bb6..c0b83cb 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h

@@ -227,7 +227,9 @@ static inline int audit_log_container_info(struct audit_context *context,
 /* These are defined in auditsc.c */
                                /* Public API */
 extern int  audit_alloc(struct task_struct *task);
+extern struct audit_context *audit_alloc_local(void);
 extern void __audit_free(struct task_struct *task);
+extern void audit_free_context(struct audit_context *context);
 extern void __audit_syscall_entry(int major, unsigned long a0, unsigned long a1,
                                  unsigned long a2, unsigned long a3);
 extern void __audit_syscall_exit(int ret_success, long ret_value);

@@ -472,6 +474,12 @@ static inline int audit_alloc(struct task_struct *task)
 {
        return 0;
 }
+static inline struct audit_context *audit_alloc_local(void)
+{
+       return NULL;
+}
+static inline void audit_free_context(struct audit_context *context)
+{ }
 static inline void audit_free(struct task_struct *task)
 { }
 static inline void audit_syscall_entry(int major, unsigned long a0,

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 2932ef1..7103d23 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c

@@ -959,8 +959,26 @@ int audit_alloc(struct task_struct *tsk)
        return 0;
 }

-static inline void audit_free_context(struct audit_context *context)
+struct audit_context *audit_alloc_local(void)
 {
+       struct audit_context *context;
+
+       if (!audit_ever_enabled)
+               return NULL; /* Return if not auditing. */
+
+       context = audit_alloc_context(AUDIT_RECORD_CONTEXT);
+       if (!context)
+               return NULL;
+       context->serial = audit_serial();
+       context->ctime = current_kernel_time64();
+       context->in_syscall = 1;
+       return context;
+}
+
+inline void audit_free_context(struct audit_context *context)
+{
+       if (!context)
+               return;
        audit_free_names(context);
        unroll_tree_refs(context, NULL, 0);
        free_tree_refs(context);