[PATCH 1/2] audit: restore AUDIT_LOGINUID unset ABI

[Richard Guy Briggs]

A regression was caused by commit 780a7654cee8:
	 audit: Make testing for a valid loginuid explicit.
(which in turn attempted to fix a regression caused by e1760bd)

When audit_krule_to_data() fills in the rules to get a listing, there was a
missing clause to convert back from AUDIT_LOGINUID_SET to AUDIT_LOGINUID.

This broke userspace by not returning the same information that was sent and
expected.

The rule:
	auditctl -a exit,never -F auid=-1
gives:
	auditctl -l
		LIST_RULES: exit,never f24=0 syscall=all
when it should give:
		LIST_RULES: exit,never auid=-1 (0xffffffff) syscall=all

Tag it so that it is reported the same way it was set.  Create a new
private flags audit_krule field (pflags) to store it that won't interact with
the public one from the API.

Cc: stable at vger.kernel.org # v3.10-rc1+
Signed-off-by: Richard Guy Briggs <rgb at redhat.com>
---
 include/linux/audit.h |    4 ++++
 kernel/auditfilter.c  |   10 ++++++++++
 2 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/include/linux/audit.h b/include/linux/audit.h
index eefc39a..b481779 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -46,6 +46,7 @@ struct audit_tree;
 struct sk_buff;
 
 struct audit_krule {
+	u32			pflags;
 	u32			flags;
 	u32			listnr;
 	u32			action;
@@ -63,6 +64,9 @@ struct audit_krule {
 	u64			prio;
 };
 
+/* Flag to indicate legacy AUDIT_LOGINUID unset usage */
+#define AUDIT_LOGINUID_LEGACY		0x1
+
 struct audit_field {
 	u32				type;
 	union {
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index fb4d2df..ecb05d3 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -441,6 +441,7 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
 		if ((f->type == AUDIT_LOGINUID) && (f->val == AUDIT_UID_UNSET)) {
 			f->type = AUDIT_LOGINUID_SET;
 			f->val = 0;
+			entry->rule.pflags |= AUDIT_LOGINUID_LEGACY;
 		}
 
 		if ((f->type == AUDIT_PID) || (f->type == AUDIT_PPID)) {
@@ -629,6 +630,13 @@ static struct audit_rule_data *audit_krule_to_data(struct audit_krule *krule)
 			data->buflen += data->values[i] =
 				audit_pack_string(&bufp, krule->filterkey);
 			break;
+		case AUDIT_LOGINUID_SET:
+			if (krule->pflags & AUDIT_LOGINUID_LEGACY && !f->val) {
+				data->fields[i] = AUDIT_LOGINUID;
+				data->values[i] = AUDIT_UID_UNSET;
+				break;
+			}
+			/* fallthrough if set */
 		default:
 			data->values[i] = f->val;
 		}
@@ -645,6 +653,7 @@ static int audit_compare_rule(struct audit_krule *a, struct audit_krule *b)
 	int i;
 
 	if (a->flags != b->flags ||
+	    a->pflags != b->pflags ||
 	    a->listnr != b->listnr ||
 	    a->action != b->action ||
 	    a->field_count != b->field_count)
@@ -762,6 +771,7 @@ struct audit_entry *audit_dupe_rule(struct audit_krule *old)
 
 	new = &entry->rule;
 	new->flags = old->flags;
+	new->pflags = old->pflags;
 	new->listnr = old->listnr;
 	new->action = old->action;
 	for (i = 0; i < AUDIT_BITMASK_SIZE; i++)
-- 
1.7.1