[PATCH 17/26] audit: allow audit matching on inode gid

[Eric Paris]

Much like the ability to filter audit on the uid of an inode collected, we
should be able to filter on the gid of the inode.

Signed-off-by: Eric Paris <eparis at redhat.com>
---

 include/linux/audit.h |    1 +
 kernel/auditfilter.c  |    1 +
 kernel/auditsc.c      |   12 ++++++++++++
 3 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/include/linux/audit.h b/include/linux/audit.h
index 15a87f1..49a19cc 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -224,6 +224,7 @@
 #define AUDIT_DIR	107
 #define AUDIT_FILETYPE	108
 #define AUDIT_OBJ_UID	109
+#define AUDIT_OBJ_GID	110
 
 #define AUDIT_ARG0      200
 #define AUDIT_ARG1      (AUDIT_ARG0+1)
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 13e9974..f10605c 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -462,6 +462,7 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
 		case AUDIT_ARG2:
 		case AUDIT_ARG3:
 		case AUDIT_OBJ_UID:
+		case AUDIT_OBJ_GID:
 			break;
 		case AUDIT_ARCH:
 			entry->rule.arch_f = f;
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 4a231e8..4cabcef 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -598,6 +598,18 @@ static int audit_filter_rules(struct task_struct *tsk,
 				}
 			}
 			break;
+		case AUDIT_OBJ_GID:
+			if (name) {
+				result = audit_comparator(name->gid, f->op, f->val);
+			} else if (ctx) {
+				list_for_each_entry(n, &ctx->names_list, list) {
+					if (audit_comparator(n->gid, f->op, f->val)) {
+						++result;
+						break;
+					}
+				}
+			}
+			break;
 		case AUDIT_WATCH:
 			if (name)
 				result = audit_watch_compare(rule->watch, name->ino, name->dev);