audit: allow audit matching on inode gid

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@redhat.com>

3 files changed, 14 insertions, 0 deletions

diff --git a/include/linux/audit.h b/include/linux/audit.h
index 55cb3daaf474..e36aa37c88af 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 13e997423dcd..f10605c787e6 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 5cf3ecc01517..87b375fb12ff 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);