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-rw-r--r--kernel/auditsc.c49
1 files changed, 40 insertions, 9 deletions
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 37c69ab561da..072566dd0caf 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -72,6 +72,8 @@
#include <linux/fs_struct.h>
#include <linux/compat.h>
#include <linux/ctype.h>
+#include <linux/string.h>
+#include <uapi/linux/limits.h>
#include "audit.h"
@@ -1861,8 +1863,7 @@ void __audit_inode(struct filename *name, const struct dentry *dentry,
}
list_for_each_entry_reverse(n, &context->names_list, list) {
- /* does the name pointer match? */
- if (!n->name || n->name->name != name->name)
+ if (!n->name || strcmp(n->name->name, name->name))
continue;
/* match the correct record type */
@@ -1881,14 +1882,44 @@ out_alloc:
n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
if (!n)
return;
- if (name)
- /* since name is not NULL we know there is already a matching
- * name record, see audit_getname(), so there must be a type
- * mismatch; reuse the string path since the original name
- * record will keep the string valid until we free it in
- * audit_free_names() */
- n->name = name;
+ /* unfortunately, while we may have a path name to record with the
+ * inode, we can't always rely on the string lasting until the end of
+ * the syscall so we need to create our own copy, it may fail due to
+ * memory allocation issues, but we do our best */
+ if (name) {
+ /* we can't use getname_kernel() due to size limits */
+ size_t len = strlen(name->name) + 1;
+ struct filename *new = __getname();
+
+ if (unlikely(!new))
+ goto out;
+
+ if (len <= (PATH_MAX - sizeof(*new))) {
+ new->name = (char *)(new) + sizeof(*new);
+ new->separate = false;
+ } else if (len <= PATH_MAX) {
+ /* this looks odd, but is due to final_putname() */
+ struct filename *new2;
+ new2 = kmalloc(sizeof(*new2), GFP_KERNEL);
+ if (unlikely(!new2)) {
+ __putname(new);
+ goto out;
+ }
+ new2->name = (char *)new;
+ new2->separate = true;
+ new = new2;
+ } else {
+ /* we should never get here, but let's be safe */
+ __putname(new);
+ goto out;
+ }
+ strlcpy((char *)new->name, name->name, len);
+ new->uptr = NULL;
+ new->aname = n;
+ n->name = new;
+ n->name_put = true;
+ }
out:
if (parent) {
n->name_len = n->name ? parent_len(n->name->name) : AUDIT_NAME_FULL;