Stefan Reinauer (stefan.reinauer@coreboot.org) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/2211
-gerrit
commit cf0babc23e90128ab8a63d076666865a55ed5425 Author: Hung-Te Lin hungte@chromium.org Date: Tue Jan 29 03:16:20 2013 +0800
cbfstool: Fix incorrect CBFS free space by old cbfstool.
Old cbfstool may produce CBFS image with calculation error in size of last empty entry, and then corrupts master header data when you really use every bit in last entry. This fix will correct free space size when you load ROM images with cbfs_image_from_file.
Change-Id: I2ada319728ef69ab9296ae446c77d37e05d05fce Signed-off-by: Hung-Te Lin hungte@chromium.org --- util/cbfstool/cbfs_image.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+)
diff --git a/util/cbfstool/cbfs_image.c b/util/cbfstool/cbfs_image.c index cc4460c..f8e2ae7 100644 --- a/util/cbfstool/cbfs_image.c +++ b/util/cbfstool/cbfs_image.c @@ -105,6 +105,31 @@ static int cbfs_calculate_file_header_size(const char *name) { align_up(strlen(name) + 1, CBFS_FILENAME_ALIGN)); }
+static int cbfs_fix_legacy_size(struct cbfs_image *image) { + // A bug in old cbfstool may produce extra few bytes (by alignment) and + // cause cbfstool to overwrite things after free space -- which is + // usually CBFS header on x86. We need to workaround that. + + struct cbfs_file *entry, *first = NULL, *last = NULL; + for (first = entry = cbfs_find_first_entry(image); + entry && cbfs_is_valid_entry(entry); + entry = cbfs_find_next_entry(image, entry)) { + last = entry; + } + if ((char *)first < (char *)image->header && + (char *)entry > (char *)image->header) { + WARN("CBFS image was created with old cbfstool with size bug. " + "Fixing size in last entry...\n"); + last->len = htonl(ntohl(last->len) - + ntohl(image->header->align)); + DEBUG("Last entry has been changed from 0x%x to 0x%x.\n", + cbfs_get_entry_addr(image, entry), + cbfs_get_entry_addr(image, + cbfs_find_next_entry(image, last))); + } + return 0; +} + int cbfs_image_from_file(struct cbfs_image *image, const char *filename) { if (buffer_from_file(&image->buffer, filename) != 0) return -1; @@ -117,6 +142,7 @@ int cbfs_image_from_file(struct cbfs_image *image, const char *filename) { cbfs_image_delete(image); return -1; } + cbfs_fix_legacy_size(image);
return 0; }