Initial commit

Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>

casadm/safeclib/memcpy_s.c

@@ -0,0 +1,157 @@
+/*------------------------------------------------------------------
+ * memcpy_s
+ *
+ * October 2008, Bo Berry
+ *
+ * Copyright (c) 2008-2011 Cisco Systems
+ * All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *------------------------------------------------------------------
+ */
+
+#include "safeclib_private.h"
+#include "safe_mem_constraint.h"
+#include "mem_primitives_lib.h"
+#include "safe_mem_lib.h"
+
+
+/**
+ * NAME
+ *    memcpy_s
+ *
+ * SYNOPSIS
+ *    #include "safe_mem_lib.h"
+ *    errno_t
+ *    memcpy_s(void *dest, rsize_t dmax, const void *src, rsize_t smax)
+ *
+ * DESCRIPTION
+ *    This function copies at most smax bytes from src to dest, up to
+ *    dmax.
+ *
+ * SPECIFIED IN
+ *    ISO/IEC JTC1 SC22 WG14 N1172, Programming languages, environments
+ *    and system software interfaces, Extensions to the C Library,
+ *    Part I: Bounds-checking interfaces
+ *
+ * INPUT PARAMETERS
+ *    dest      pointer to memory that will be replaced by src.
+ *
+ *    dmax      maximum length of the resulting dest
+ *
+ *    src       pointer to the memory that will be copied to dest
+ *
+ *    smax      maximum number bytes of src to copy
+ *
+ *  OUTPUT PARAMETERS
+ *    dest      is updated
+ *
+ * RUNTIME CONSTRAINTS
+ *    Neither dest nor src shall be a null pointer.
+ *    Neither dmax nor smax shall be zero.
+ *    dmax shall not be greater than RSIZE_MAX_MEM.
+ *    smax shall not be greater than dmax.
+ *    Copying shall not take place between regions that overlap.
+ *    If there is a runtime-constraint violation, the memcpy_s function
+ *        stores zeros in the first dmax bytes of the region pointed to
+ *        by dest if dest is not a null pointer and smax is valid.
+ *
+ * RETURN VALUE
+ *    EOK        successful operation
+ *    ESNULLP    NULL pointer
+ *    ESZEROL    zero length
+ *    ESLEMAX    length exceeds max limit
+ *    ESOVRLP    source memory overlaps destination
+ *
+ * ALSO SEE
+ *    memcpy16_s(), memcpy32_s(), memmove_s(), memmove16_s(),
+ *     memmove32_s()
+ *
+ */
+errno_t
+memcpy_s (void *dest, rsize_t dmax, const void *src, rsize_t smax)
+{
+    uint8_t *dp;
+    const uint8_t  *sp;
+
+    dp = dest;
+    sp = src;
+
+    if (dp == NULL) {
+        invoke_safe_mem_constraint_handler("memcpy_s: dest is NULL",
+                   NULL, ESNULLP);
+        return RCNEGATE(ESNULLP);
+    }
+
+    if (dmax == 0) {
+        invoke_safe_mem_constraint_handler("memcpy_s: dmax is 0",
+                   NULL, ESZEROL);
+        return RCNEGATE(ESZEROL);
+    }
+
+    if (dmax > RSIZE_MAX_MEM) {
+        invoke_safe_mem_constraint_handler("memcpy_s: dmax exceeds max",
+                   NULL, ESLEMAX);
+        return RCNEGATE(ESLEMAX);
+    }
+
+    if (smax == 0) {
+        mem_prim_set(dp, dmax, 0);
+        invoke_safe_mem_constraint_handler("memcpy_s: smax is 0",
+                   NULL, ESZEROL);
+        return RCNEGATE(ESZEROL);
+    }
+
+    if (smax > dmax) {
+        mem_prim_set(dp, dmax, 0);
+        invoke_safe_mem_constraint_handler("memcpy_s: smax exceeds dmax",
+                   NULL, ESLEMAX);
+        return RCNEGATE(ESLEMAX);
+    }
+
+    if (sp == NULL) {
+        mem_prim_set(dp, dmax, 0);
+        invoke_safe_mem_constraint_handler("memcpy_s: src is NULL",
+                   NULL, ESNULLP);
+        return RCNEGATE(ESNULLP);
+    }
+
+
+    /*
+     * overlap is undefined behavior, do not allow
+     */
+    if( ((dp > sp) && (dp < (sp+smax))) ||
+        ((sp > dp) && (sp < (dp+dmax))) ) {
+        mem_prim_set(dp, dmax, 0);
+        invoke_safe_mem_constraint_handler("memcpy_s: overlap undefined",
+                   NULL, ESOVRLP);
+        return RCNEGATE(ESOVRLP);
+    }
+
+    /*
+     * now perform the copy
+     */
+    mem_prim_move(dp, sp, smax);
+
+    return RCNEGATE(EOK);
+}
+EXPORT_SYMBOL(memcpy_s);