audit: convert status version to a feature bitmap

The version field defined in the audit status structure was found to have
limitations in terms of its expressibility of features supported.  This is
distict from the get/set features call to be able to command those features
that are present.

Converting this field from a version number to a feature bitmap will allow
distributions to selectively backport and support certain features and will
allow upstream to be able to deprecate features in the future.  It will allow
userspace clients to first query the kernel for which features are actually
present and supported.  Currently, EINVAL is returned rather than EOPNOTSUP,
which isn't helpful in determining if there was an error in the command, or if
it simply isn't supported yet.  Past features are not represented by this
bitmap, but their use may be converted to EOPNOTSUP if needed in the future.

Since "version" is too generic to convert with a #define, use a union in the
struct status, introducing the member "feature_bitmap" unionized with
"version".

Convert existing AUDIT_VERSION_* macros over to AUDIT_FEATURE_BITMAP*
counterparts, leaving the former for backwards compatibility.

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
[PM: minor whitespace tweaks]
Signed-off-by: Paul Moore <pmoore@redhat.com>

2 files changed, 14 insertions, 5 deletions

diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
index 4d100c841c80..2ccf19e06e15 100644
--- a/include/uapi/linux/audit.h
+++ b/include/uapi/linux/audit.h
@@ -322,9 +322,15 @@ enum {
 #define AUDIT_STATUS_BACKLOG_LIMIT      0x0010
 #define AUDIT_STATUS_BACKLOG_WAIT_TIME  0x0020
 
-#define AUDIT_VERSION_BACKLOG_LIMIT     1
-#define AUDIT_VERSION_BACKLOG_WAIT_TIME 2
-#define AUDIT_VERSION_LATEST AUDIT_VERSION_BACKLOG_WAIT_TIME
+#define AUDIT_FEATURE_BITMAP_BACKLOG_LIMIT      0x00000001
+#define AUDIT_FEATURE_BITMAP_BACKLOG_WAIT_TIME  0x00000002
+#define AUDIT_FEATURE_BITMAP_ALL (AUDIT_FEATURE_BITMAP_BACKLOG_LIMIT | \
+                                  AUDIT_FEATURE_BITMAP_BACKLOG_WAIT_TIME)
+
+/* deprecated: AUDIT_VERSION_* */
+#define AUDIT_VERSION_LATEST            AUDIT_FEATURE_BITMAP_ALL
+#define AUDIT_VERSION_BACKLOG_LIMIT     AUDIT_FEATURE_BITMAP_BACKLOG_LIMIT
+#define AUDIT_VERSION_BACKLOG_WAIT_TIME AUDIT_FEATURE_BITMAP_BACKLOG_WAIT_TIME
 
                                 /* Failure-to-log actions */
 #define AUDIT_FAIL_SILENT       0
@@ -403,7 +409,10 @@ struct audit_status {
         __u32           backlog_limit;  /* waiting messages limit */
         __u32           lost;           /* messages lost */
         __u32           backlog;        /* messages waiting in queue */
-        __u32           version;        /* audit api version number */
+        union {
+                __u32   version;        /* deprecated: audit api version num */
+                __u32   feature_bitmap; /* bitmap of kernel audit features */
+        };
         __u32           backlog_wait_time;/* message queue wait timeout */
 };
 
diff --git a/kernel/audit.c b/kernel/audit.c
index 53bb39bf79e2..7b83c557aee6 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -842,7 +842,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
                 s.backlog_limit         = audit_backlog_limit;
                 s.lost                  = atomic_read(&audit_lost);
                 s.backlog               = skb_queue_len(&audit_skb_queue);
-                s.version               = AUDIT_VERSION_LATEST;
+                s.feature_bitmap        = AUDIT_FEATURE_BITMAP_ALL;
                 s.backlog_wait_time     = audit_backlog_wait_time;
                 audit_send_reply(skb, seq, AUDIT_GET, 0, 0, &s, sizeof(s));
                 break;