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authorJeff Layton <jlayton@redhat.com>2012-10-10 15:25:28 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-10-12 20:15:08 -0400
commit7ac86265dc8f665cc49d6e60a125e608cd2fca14 (patch)
tree9e7941e2d8dfb2106c5fb28504531dafc72e14e6 /kernel
parent91a27b2a756784714e924e5e854b919273082d26 (diff)
downloadvexpress-lsk-7ac86265dc8f665cc49d6e60a125e608cd2fca14.tar.gz
audit: allow audit code to satisfy getname requests from its names_list
Currently, if we call getname() on a userland string more than once, we'll get multiple copies of the string and multiple audit_names records. Add a function that will allow the audit_names code to satisfy getname requests using info from the audit_names list, avoiding a new allocation and audit_names records. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/auditsc.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index d4d82319eed..521163a5d65 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -2021,6 +2021,29 @@ static struct audit_names *audit_alloc_name(struct audit_context *context,
}
/**
+ * audit_reusename - fill out filename with info from existing entry
+ * @uptr: userland ptr to pathname
+ *
+ * Search the audit_names list for the current audit context. If there is an
+ * existing entry with a matching "uptr" then return the filename
+ * associated with that audit_name. If not, return NULL.
+ */
+struct filename *
+__audit_reusename(const __user char *uptr)
+{
+ struct audit_context *context = current->audit_context;
+ struct audit_names *n;
+
+ list_for_each_entry(n, &context->names_list, list) {
+ if (!n->name)
+ continue;
+ if (n->name->uptr == uptr)
+ return n->name;
+ }
+ return NULL;
+}
+
+/**
* audit_getname - add a name to the list
* @name: name to add
*