[coreboot] r3420 - trunk/util/flashrom

[svn at coreboot.org]

Author: hailfinger
Date: 2008-07-11 02:06:38 +0200 (Fri, 11 Jul 2008)
New Revision: 3420

Modified:
   trunk/util/flashrom/layout.c
Log:
Fix and clean up coreboot image detection heuristic.
Additional compile fix for NetBSD.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006 at gmx.net>
Acked-by: Stefan Reinauer <stepan at coresystems.de>


Modified: trunk/util/flashrom/layout.c
===================================================================
--- trunk/util/flashrom/layout.c	2008-07-08 16:18:38 UTC (rev 3419)
+++ trunk/util/flashrom/layout.c	2008-07-11 00:06:38 UTC (rev 3420)
@@ -45,7 +45,12 @@
 int show_id(uint8_t *bios, int size, int force)
 {
 	unsigned int *walk;
+	unsigned int mb_part_offset, mb_vendor_offset;
+	char *mb_part, *mb_vendor;
 
+	mainboard_vendor = def_name;
+	mainboard_part = def_name;
+
 	walk = (unsigned int *)(bios + size - 0x10);
 	walk--;
 
@@ -63,25 +68,28 @@
 	 * are outside the image of if the start of ID strings are nonsensical
 	 * (nonprintable and not \0).
 	 */
-	if ((*walk) == 0 || ((*walk) & 0x3ff) != 0 || *walk > size ||
-		*(walk - 1) > size || *(walk - 2) > size ||
-		(!isprint((const char *)(bios + size - *(walk - 1))) &&
-		((const char *)(bios + size - *(walk - 1)))) ||
-		(!isprint((const char *)(bios + size - *(walk - 2))) &&
-		((const char *)(bios + size - *(walk - 2))))) {
+	mb_part_offset = *(walk - 1);
+	mb_vendor_offset = *(walk - 2);
+	if ((*walk) == 0 || ((*walk) & 0x3ff) != 0 || (*walk) > size ||
+	    mb_part_offset > size || mb_vendor_offset > size) {
 		printf("Flash image seems to be a legacy BIOS. Disabling checks.\n");
-		mainboard_vendor = def_name;
-		mainboard_part = def_name;
 		return 0;
 	}
+	
+	mb_part = (char *)(bios + size - mb_part_offset);
+	mb_vendor = (char *)(bios + size - mb_vendor_offset);
+	if (!isprint((unsigned char)*mb_part) ||
+	    !isprint((unsigned char)*mb_vendor)) {
+		printf("Flash image seems to have garbage in the ID location."
+			" Disabling checks.\n");
+		return 0;
+	}
 
 	printf_debug("coreboot last image size "
 		     "(not ROM size) is %d bytes.\n", *walk);
 
-	walk--;
-	mainboard_part = strdup((const char *)(bios + size - *walk));
-	walk--;
-	mainboard_vendor = strdup((const char *)(bios + size - *walk));
+	mainboard_part = strdup(mb_part);
+	mainboard_vendor = strdup(mb_vendor);
 	printf_debug("Manufacturer: %s\n", mainboard_vendor);
 	printf_debug("Mainboard ID: %s\n", mainboard_part);