1 files changed, 110 insertions, 0 deletions
diff --git a/src/util/util_safealign.h b/src/util/util_safealign.h
new file mode 100644
index 000000000..d1d7a4861
--- /dev/null
+++ b/src/util/util_safealign.h
@@ -0,0 +1,110 @@
+/*
+   SSSD
+
+   Authors:
+        Simo Sorce <ssorce@redhat.com>
+
+   Copyright (C) Red Hat, Inc 2007
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/* CAUTION:
+ * This file is also used in sss_client (pam, nss). Therefore it has to be
+ * minimalist and cannot include DEBUG macros or header file util.h.
+ */
+
+
+#ifndef _UTIL_SAFEALIGN_H
+#define _UTIL_SAFEALIGN_H
+
+#include <string.h>
+
+#define SIZE_T_MAX ((size_t) -1)
+
+#define SIZE_T_OVERFLOW(current, add) \
+                        (((size_t)(add)) > (SIZE_T_MAX - ((size_t)(current))))
+
+static inline void
+safealign_memcpy(void *dest, const void *src, size_t n, size_t *counter)
+{
+    memcpy(dest, src, n);
+    if (counter) {
+        *counter += n;
+    }
+}
+
+#define SAFEALIGN_VAR2BUF(dest, value, type, pctr) do { \
+    type CV_MACRO_val = (type)(value); \
+    safealign_memcpy(dest, &CV_MACRO_val, sizeof(type), pctr); \
+} while(0)
+
+#define SAFEALIGN_BUF2VAR_INT64(dest, src, pctr) \
+    safealign_memcpy(dest, src, sizeof(int64_t), pctr)
+
+#define SAFEALIGN_VAR2BUF_INT64(dest, value, pctr) \
+    SAFEALIGN_VAR2BUF(dest, value, int64_t, pctr)
+
+#define SAFEALIGN_BUF2VAR_UINT32(dest, src, pctr) \
+    safealign_memcpy(dest, src, sizeof(uint32_t), pctr)
+
+#define SAFEALIGN_VAR2BUF_UINT32(dest, value, pctr) \
+    SAFEALIGN_VAR2BUF(dest, value, uint32_t, pctr)
+
+#define SAFEALIGN_BUF2VAR_INT32(dest, src, pctr) \
+    safealign_memcpy(dest, src, sizeof(int32_t), pctr)
+
+#define SAFEALIGN_VAR2BUF_INT32(dest, value, pctr) \
+    SAFEALIGN_VAR2BUF(dest, value, int32_t, pctr)
+
+#define SAFEALIGN_BUF2VAR_UINT16(dest, src, pctr) \
+    safealign_memcpy(dest, src, sizeof(uint16_t), pctr)
+
+#define SAFEALIGN_VAR2BUF_UINT16(dest, value, pctr) \
+    SAFEALIGN_VAR2BUF(dest, value, uint16_t, pctr)
+
+#define SAFEALIGN_BUF2VAR_UINT32_CHECK(dest, src, len, pctr) do { \
+    if ((*(pctr) + sizeof(uint32_t)) > (len) || \
+        SIZE_T_OVERFLOW(*(pctr), sizeof(uint32_t))) return EINVAL; \
+    safealign_memcpy(dest, src, sizeof(uint32_t), pctr); \
+} while(0)
+
+#define SAFEALIGN_BUF2VAR_INT32_CHECK(dest, src, len, pctr) do { \
+    if ((*(pctr) + sizeof(int32_t)) > (len) || \
+        SIZE_T_OVERFLOW(*(pctr), sizeof(int32_t))) return EINVAL; \
+    safealign_memcpy(dest, src, sizeof(int32_t), pctr); \
+} while(0)
+
+#define SAFEALIGN_BUF2VAR_UINT16_CHECK(dest, src, len, pctr) do { \
+    if ((*(pctr) + sizeof(uint16_t)) > (len) || \
+        SIZE_T_OVERFLOW(*(pctr), sizeof(uint16_t))) return EINVAL; \
+    safealign_memcpy(dest, src, sizeof(uint16_t), pctr); \
+} while(0)
+
+
+/* Do not use these aliases in new code. Use the macros above instead. */
+#define SAFEALIGN_SET_VALUE         SAFEALIGN_VAR2BUF
+#define SAFEALIGN_COPY_INT64        SAFEALIGN_BUF2VAR_INT64
+#define SAFEALIGN_SET_INT64         SAFEALIGN_VAR2BUF_INT64
+#define SAFEALIGN_COPY_UINT32       SAFEALIGN_BUF2VAR_UINT32
+#define SAFEALIGN_SET_UINT32        SAFEALIGN_VAR2BUF_UINT32
+#define SAFEALIGN_COPY_INT32        SAFEALIGN_BUF2VAR_INT32
+#define SAFEALIGN_SET_INT32         SAFEALIGN_VAR2BUF_INT32
+#define SAFEALIGN_COPY_UINT16       SAFEALIGN_BUF2VAR_UINT16
+#define SAFEALIGN_SET_UINT16        SAFEALIGN_VAR2BUF_UINT16
+#define SAFEALIGN_COPY_UINT32_CHECK SAFEALIGN_BUF2VAR_UINT32_CHECK
+#define SAFEALIGN_COPY_INT32_CHECK  SAFEALIGN_BUF2VAR_INT32_CHECK
+#define SAFEALIGN_COPY_UINT16_CHECK SAFEALIGN_BUF2VAR_UINT16_CHECK
+
+#endif /* _UTIL_SAFEALIGN_H */