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kernel: mtdsplit_uimage: add "openwrt, offset" and "openwrt, partition-magic" 

Some devices prepend a standard U-Boot Image with a vendor specific
header, having its own magic. Adding two new properties will support
validation of such images, including the additional magic.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
This commit is contained in:
Bjørn Mork 2021-01-20 18:36:52 +01:00 committed by Petr Štetiar
parent ff7709d223
commit 3f36dffbde
1 changed files with 28 additions and 12 deletions
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40
target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_uimage.c
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@ -70,7 +70,8 @@ read_uimage_header(struct mtd_info *mtd, size_t offset, u_char *buf,
}
static void uimage_parse_dt(struct mtd_info *master, int *extralen,
u32 *ih_magic, u32 *ih_type)
u32 *ih_magic, u32 *ih_type,
u32 *header_offset, u32 *part_magic)
{
struct device_node *np = mtd_get_of_node(master);
@ -83,6 +84,10 @@ static void uimage_parse_dt(struct mtd_info *master, int *extralen,
pr_debug("got openwrt,ih-magic=%08x from device-tree\n", *ih_magic);
if (!of_property_read_u32(np, "openwrt,ih-type", ih_type))
pr_debug("got openwrt,ih-type=%08x from device-tree\n", *ih_type);
if (!of_property_read_u32(np, "openwrt,offset", header_offset))
pr_debug("got ih-start=%u from device-tree\n", *header_offset);
if (!of_property_read_u32(np, "openwrt,partition-magic", part_magic))
pr_debug("got openwrt,partition-magic=%08x from device-tree\n", *part_magic);
}
/**
@ -92,9 +97,9 @@ static void uimage_parse_dt(struct mtd_info *master, int *extralen,
* and tail padding length of a valid uImage header if found
*/
static int __mtdsplit_parse_uimage(struct mtd_info *master,
const struct mtd_partition **pparts,
struct mtd_part_parser_data *data,
ssize_t (*find_header)(u_char *buf, size_t len, u32 ih_magic, u32 ih_type))
const struct mtd_partition **pparts,
struct mtd_part_parser_data *data,
ssize_t (*find_header)(u_char *buf, size_t len, u32 ih_magic, u32 ih_type))
{
struct mtd_partition *parts;
u_char *buf;
@ -104,11 +109,14 @@ static int __mtdsplit_parse_uimage(struct mtd_info *master,
size_t uimage_size = 0;
size_t rootfs_offset;
size_t rootfs_size = 0;
size_t buflen;
int uimage_part, rf_part;
int ret;
int extralen = 0;
u32 ih_magic = IH_MAGIC;
u32 ih_type = IH_TYPE_KERNEL;
u32 header_offset = 0;
u32 part_magic = 0;
enum mtdsplit_part_type type;
nr_parts = 2;
@ -116,34 +124,42 @@ static int __mtdsplit_parse_uimage(struct mtd_info *master,
if (!parts)
return -ENOMEM;
buf = vmalloc(MAX_HEADER_LEN);
uimage_parse_dt(master, &extralen, &ih_magic, &ih_type, &header_offset, &part_magic);
buflen = MAX_HEADER_LEN;
buf = vmalloc(buflen);
if (!buf) {
ret = -ENOMEM;
goto err_free_parts;
}
uimage_parse_dt(master, &extralen, &ih_magic, &ih_type);
/* find uImage on erase block boundaries */
for (offset = 0; offset < master->size; offset += master->erasesize) {
struct uimage_header *header;
uimage_size = 0;
ret = read_uimage_header(master, offset, buf, MAX_HEADER_LEN);
ret = read_uimage_header(master, offset, buf, buflen);
if (ret)
continue;
ret = find_header(buf, MAX_HEADER_LEN, ih_magic, ih_type);
/* verify optional partition magic before uimage header */
if (header_offset && part_magic && (be32_to_cpu(*(u32 *)buf) != part_magic))
continue;
ret = find_header(buf + header_offset, buflen, ih_magic, ih_type);
if (ret < 0) {
pr_debug("no valid uImage found in \"%s\" at offset %llx\n",
master->name, (unsigned long long) offset);
continue;
}
header = (struct uimage_header *)(buf + ret);
/* let uimage_find_edimax override the offset */
if (ret > 0)
header_offset = ret;
header = (struct uimage_header *)(buf + header_offset);
uimage_size = sizeof(*header) +
be32_to_cpu(header->ih_size) + ret + extralen;
be32_to_cpu(header->ih_size) + header_offset + extralen;
if ((offset + uimage_size) > master->size) {
pr_debug("uImage exceeds MTD device \"%s\"\n",
@ -254,7 +270,7 @@ mtdsplit_uimage_parse_generic(struct mtd_info *master,
struct mtd_part_parser_data *data)
{
return __mtdsplit_parse_uimage(master, pparts, data,
uimage_verify_default);
uimage_verify_default);
}
static const struct of_device_id mtdsplit_uimage_of_match_table[] = {