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| author | Jonas Gorski <jonas.gorski@gmail.com> | 2011-12-17 13:58:18 +0100 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2012-01-09 18:23:32 +0000 |
| commit | f98872fc14ecb96f796443911b6bc4767e58e885 (patch) | |
| tree | fac2482d883da626b8c0e1293b524ea90bbf796e /drivers | |
| parent | 805166783893651e3352ee9e68ad5d0b68a769f1 (diff) | |
| download | linux-f98872fc14ecb96f796443911b6bc4767e58e885.tar.gz linux-f98872fc14ecb96f796443911b6bc4767e58e885.tar.bz2 linux-f98872fc14ecb96f796443911b6bc4767e58e885.zip | |
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')
| -rw-r--r-- | drivers/mtd/bcm63xxpart.c | 45 |
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; |