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authorBjørn Mork <bjorn@mork.no>2021-01-20 18:36:52 +0100
committerPetr Štetiar <ynezz@true.cz>2021-01-22 21:03:11 +0100
commit3f36dffbdee0d08f982950490b6d2bfb6568d376 (patch)
tree7bbf55a202c85dc1a4cd2962fe152634e6deb7e7 /target/linux/generic/files/drivers/mtd
parentff7709d223e15cfc496abf09acae12826d9216e6 (diff)
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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>
Diffstat (limited to 'target/linux/generic/files/drivers/mtd')
-rw-r--r--target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_uimage.c40
1 files changed, 28 insertions, 12 deletions
diff --git a/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_uimage.c b/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_uimage.c
index c29eb6234b..7a8ccdf8f5 100644
--- a/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_uimage.c
+++ b/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_uimage.c
@@ -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[] = {