[PATCH 6/6] [WIP] layout: Bailout early in process_include_args() if region file is inaccessible.

[Stefan Tauner]

Signed-off-by: Stefan Tauner 
---
 layout.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/layout.c b/layout.c
index d522348..66b7d5b 100644
--- a/layout.c
+++ b/layout.c
@@ -19,6 +19,11 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  */

+#ifndef __LIBPAYLOAD__
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#endif
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -443,6 +448,25 @@ int process_include_args(void)
    		msg_gerr("Error: No file I/O support in libpayload\n");
    		return 1;
 #else
+			if (access(file, R_OK) != 0) {
+				msg_gerr("Region file name "%s" seems to be unreadable: %s\n",
+					 file, strerror(errno));
+				return 1;
+			}
+
+			struct stat file_stat;
+			if (stat((file), &file_stat) != 0) {
+				msg_gerr("Error: getting metadata of file "%s" failed: %s\n",
+					 file, strerror(errno));
+				return 1;
+			}
+			chipoff_t size = rom_entries[idx].end - rom_entries[idx].start + 1;
+			if (file_stat.st_size != size) {
+				msg_gerr("Error: Region file size (%jd B) doesn't match the region's size (%"
+					 PRIuCHIPSIZE " B)!\n", (intmax_t)file_stat.st_size, size);
+				return 1;
+			}
+
    		file = strdup(file);
    		if (file == NULL) {
    			msg_gerr("Out of memory!\n");