lib: libc: Add support for secure memcpy
Add support for memcpy which takes care of buffer overflows
Change-Id: I57f33f53122c5747ff74655b22b1ebaaa9e61141
diff --git a/include/string.h b/include/string.h
index 661e746..593ecf2 100644
--- a/include/string.h
+++ b/include/string.h
@@ -33,6 +33,8 @@
void *memchr (void const *, int, size_t) __PURE;
int memcmp (void const *, const void *, size_t) __PURE;
void *memcpy (void *, void const *, size_t);
+/* secure memcpy, does not copy beyong size of dest buffer*/
+size_t memscpy (void *, size_t, void const *, size_t);
void *memmove(void *, void const *, size_t);
void *memset (void *, int, size_t);
diff --git a/lib/libc/string/memscpy.c b/lib/libc/string/memscpy.c
new file mode 100644
index 0000000..3dd4d6b
--- /dev/null
+++ b/lib/libc/string/memscpy.c
@@ -0,0 +1,37 @@
+/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ * * Neither the name of The Linux Fundation, Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <string.h>
+
+size_t memscpy(void *dest, size_t dst_size, const void *src, size_t src_size)
+{
+ size_t copy_size = dst_size < src_size ? dst_size : src_size;
+ memcpy(dest, src, copy_size);
+ return copy_size;
+}
diff --git a/lib/libc/string/rules.mk b/lib/libc/string/rules.mk
index fc1ceb2..97a5db8 100644
--- a/lib/libc/string/rules.mk
+++ b/lib/libc/string/rules.mk
@@ -8,6 +8,7 @@
memcpy \
memmove \
memset \
+ memscpy \
strcat \
strchr \
strcmp \