[PATCH 16/26] audit: allow matching on obj_uid

Eric Paris
2011-11-17T22:04:12Z

Allow syscall exit filter matching based on the uid of the owner of an
inode used in a syscall. aka:

auditctl -a always,exit -S open -F obj_uid=0 -F perm=wa

Signed-off-by: Eric Paris <eparis@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 abff67f..15a87f1 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -223,6 +223,7 @@
#define AUDIT_PERM 106
#define AUDIT_DIR 107
#define AUDIT_FILETYPE 108
+#define AUDIT_OBJ_UID 109

#define AUDIT_ARG0 200
#define AUDIT_ARG1 (AUDIT_ARG0+1)
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 903caa2..13e9974 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -461,6 +461,7 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
case AUDIT_ARG1:
case AUDIT_ARG2:
case AUDIT_ARG3:
+ case AUDIT_OBJ_UID:
break;
case AUDIT_ARCH:
entry->rule.arch_f = f;
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index aa8588c..4a231e8 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -586,6 +586,18 @@ static int audit_filter_rules(struct task_struct *tsk,
}
}
break;
+ case AUDIT_OBJ_UID:
+ if (name) {
+ result = audit_comparator(name->uid, f->op, f->val);
+ } else if (ctx) {
+ list_for_each_entry(n, &ctx->names_list, list) {
+ if (audit_comparator(n->uid, f->op, f->val)) {
+ ++result;
+ break;
+ }
+ }
+ }
+ break;
case AUDIT_WATCH:
if (name)
result = audit_watch_compare(rule->watch, name->ino, name->dev);