From e17843c4a75ce440e19d545ddb2e04372f548c07 Mon Sep 17 00:00:00 2001 From: Steven Sherk Date: Wed, 14 Aug 2013 14:55:57 -0600 Subject: cbfs: Fix overwalk on file scan A bootblock overwalk was occuring when deriving the actual length, the bootblock size was not taken into account and bootblock size was not aligned. Resolved merge conflict. Change-Id: I7eb42f8deaaf223dcf07b37bb7dde4643acd508f Signed-off-by: Steven Sherk Reviewed-on: https://gerrit.chromium.org/gerrit/65989 Reviewed-by: Aaron Durbin Commit-Queue: Steve Sherk Tested-by: Steve Sherk (cherry picked from commit 20b0ba479b01755fbdc7f3dd9214e8af923402ba) Signed-off-by: Isaac Christensen Reviewed-on: http://review.coreboot.org/6539 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel Reviewed-by: Patrick Georgi --- payloads/libpayload/libcbfs/cbfs_core.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) (limited to 'payloads') diff --git a/payloads/libpayload/libcbfs/cbfs_core.c b/payloads/libpayload/libcbfs/cbfs_core.c index a3d3e02467..fb15744fe0 100644 --- a/payloads/libpayload/libcbfs/cbfs_core.c +++ b/payloads/libpayload/libcbfs/cbfs_core.c @@ -119,11 +119,22 @@ struct cbfs_file *cbfs_get_file(struct cbfs_media *media, const char *name) // TODO Add a "size" in CBFS header for a platform independent way to // determine the end of CBFS data. #if defined(CONFIG_LP_ARCH_X86) && CONFIG_LP_ARCH_X86 - romsize -= htonl(header->bootblocksize); + // resolve actual length of ROM used for CBFS components + // the bootblock size was not taken into account + romsize -= ntohl(header->bootblocksize); + + // fine tune the length to handle alignment positioning. + // using (bootblock size) % align, to derive the + // number of bytes the bootblock is off from the alignment size. + if ((ntohl(header->bootblocksize) % align)) + romsize -= (align - (ntohl(header->bootblocksize) % align)); + else + romsize -= 1; #endif - DEBUG("CBFS location: 0x%x~0x%x, align: %d\n", offset, romsize, align); + DEBUG("CBFS location: 0x%x~0x%x, align: %d\n", offset, romsize, align); DEBUG("Looking for '%s' starting from 0x%x.\n", name, offset); + media->open(media); while (offset < romsize && media->read(media, &file, offset, sizeof(file)) == sizeof(file)) { -- cgit v1.2.3