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authorJonas Gorski2011-12-17 13:58:18 +0100
committerDavid Woodhouse2012-01-09 18:23:32 +0000
commitf98872fc14ecb96f796443911b6bc4767e58e885 (patch)
treefac2482d883da626b8c0e1293b524ea90bbf796e /drivers/mtd
parent805166783893651e3352ee9e68ad5d0b68a769f1 (diff)
mtd: bcm63xxpart: check the image tag's crc32
Only use the values from the image tag if it is valid. Always create the CFE, NVRAM and linux partitions, to allow flashing a new image even if the old is invalid without overwriting CFE or NVRAM. Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/bcm63xxpart.c45
1 files changed, 29 insertions, 16 deletions
diff --git a/drivers/mtd/bcm63xxpart.c b/drivers/mtd/bcm63xxpart.c
index 6afc4aa3c622..9ee8bc426e93 100644
--- a/drivers/mtd/bcm63xxpart.c
+++ b/drivers/mtd/bcm63xxpart.c
@@ -24,6 +24,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/crc32.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
@@ -80,8 +81,7 @@ static int bcm63xx_parse_cfe_partitions(struct mtd_info *master,
unsigned int cfelen, nvramlen;
int namelen = 0;
int i;
- char *boardid;
- char *tagversion;
+ u32 computed_crc;
if (bcm63xx_detect_cfe(master))
return -EINVAL;
@@ -103,20 +103,33 @@ static int bcm63xx_parse_cfe_partitions(struct mtd_info *master,
return -EIO;
}
- sscanf(buf->kernel_address, "%u", &kerneladdr);
- sscanf(buf->kernel_length, "%u", &kernellen);
- sscanf(buf->total_length, "%u", &totallen);
- tagversion = &(buf->tag_version[0]);
- boardid = &(buf->board_id[0]);
-
- pr_info("CFE boot tag found with version %s and board type %s\n",
- tagversion, boardid);
-
- kerneladdr = kerneladdr - BCM63XX_EXTENDED_SIZE;
- rootfsaddr = kerneladdr + kernellen;
- spareaddr = roundup(totallen, master->erasesize) + cfelen;
- sparelen = master->size - spareaddr - nvramlen;
- rootfslen = spareaddr - rootfsaddr;
+ computed_crc = crc32_le(IMAGETAG_CRC_START, (u8 *)buf,
+ offsetof(struct bcm_tag, header_crc));
+ if (computed_crc == buf->header_crc) {
+ char *boardid = &(buf->board_id[0]);
+ char *tagversion = &(buf->tag_version[0]);
+
+ sscanf(buf->kernel_address, "%u", &kerneladdr);
+ sscanf(buf->kernel_length, "%u", &kernellen);
+ sscanf(buf->total_length, "%u", &totallen);
+
+ pr_info("CFE boot tag found with version %s and board type %s\n",
+ tagversion, boardid);
+
+ kerneladdr = kerneladdr - BCM63XX_EXTENDED_SIZE;
+ rootfsaddr = kerneladdr + kernellen;
+ spareaddr = roundup(totallen, master->erasesize) + cfelen;
+ sparelen = master->size - spareaddr - nvramlen;
+ rootfslen = spareaddr - rootfsaddr;
+ } else {
+ pr_warn("CFE boot tag CRC invalid (expected %08x, actual %08x)\n",
+ buf->header_crc, computed_crc);
+ kernellen = 0;
+ rootfslen = 0;
+ rootfsaddr = 0;
+ spareaddr = cfelen;
+ sparelen = master->size - cfelen - nvramlen;
+ }
/* Determine number of partitions */
namelen = 8;