1 files changed, 97 insertions, 0 deletions
diff --git a/src/util/memory.c b/src/util/memory.c
new file mode 100644
index 0000000..4fb8cfa
--- /dev/null
+++ b/src/util/memory.c
@@ -0,0 +1,97 @@
+/*
+    Authors:
+        Simo Sorce <ssorce@redhat.com>
+
+    Copyright (C) 2009 Red Hat
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <talloc.h>
+
+#include "util/util.h"
+
+
+#ifdef HAVE_EXPLICIT_BZERO
+
+#include <string.h>
+
+#else
+
+typedef void *(*_sss_memset_t)(void *, int, size_t);
+
+static volatile _sss_memset_t memset_func = memset;
+
+static void explicit_bzero(void *s, size_t n)
+{
+    memset_func(s, 0, n);
+}
+
+#endif
+
+
+int sss_erase_talloc_mem_securely(void *p)
+{
+    if (p == NULL) {
+        return 0;
+    }
+
+    size_t size = talloc_get_size(p);
+    if (size == 0) {
+        return 0;
+    }
+
+    explicit_bzero(p, size);
+
+    return 0;
+}
+
+void sss_erase_mem_securely(void *p, size_t size)
+{
+    if ((p == NULL) || (size == 0)) {
+        return;
+    }
+
+    explicit_bzero(p, size);
+}
+
+
+struct mem_holder {
+    void *mem;
+    void_destructor_fn_t *fn;
+};
+
+static int mem_holder_destructor(void *ptr)
+{
+    struct mem_holder *h;
+
+    h = talloc_get_type(ptr, struct mem_holder);
+    return h->fn(h->mem);
+}
+
+int sss_mem_attach(TALLOC_CTX *mem_ctx, void *ptr, void_destructor_fn_t *fn)
+{
+    struct mem_holder *h;
+
+    if (!ptr || !fn) return EINVAL;
+
+    h = talloc(mem_ctx, struct mem_holder);
+    if (!h) return ENOMEM;
+
+    h->mem = ptr;
+    h->fn = fn;
+    talloc_set_destructor((TALLOC_CTX *)h, mem_holder_destructor);
+
+    return EOK;
+}