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authorFlorian Fainelli <florian@openwrt.org>2007-03-24 10:22:53 +0000
committerFlorian Fainelli <florian@openwrt.org>2007-03-24 10:22:53 +0000
commit7b564bfdcbef05f68d8a658caf832c6832705e1f (patch)
tree2f78aa0cc686e33a3ab74b5920c9574fe40afba1 /tools/firmware-utils
parent1cd307f48b3aabfe1072f49890426b32f4d06e2d (diff)
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Fix potential unligned access with MyLoader based devices, thanks Juhos
SVN-Revision: 6659
Diffstat (limited to 'tools/firmware-utils')
-rw-r--r--tools/firmware-utils/src/mkmylofw.c54
1 files changed, 46 insertions, 8 deletions
diff --git a/tools/firmware-utils/src/mkmylofw.c b/tools/firmware-utils/src/mkmylofw.c
index b432cbc..1c540f5 100644
--- a/tools/firmware-utils/src/mkmylofw.c
+++ b/tools/firmware-utils/src/mkmylofw.c
@@ -70,6 +70,8 @@ struct cpx_board {
#define CPX_BOARD(_did, _flash, _mod, _name, _desc) \
BOARD(VENID_COMPEX, _did, VENID_COMPEX, _did, _flash, _mod, _name, _desc)
+#define ALIGN(x,y) ((x)+((y)-1)) & ~((y)-1)
+
char *progname;
char *ofname = NULL;
@@ -449,7 +451,7 @@ write_out_data(FILE *outfile, uint8_t *data, size_t len, uint32_t *crc)
}
-inline int
+int
write_out_desc(FILE *outfile, struct mylo_fw_blockdesc *desc, uint32_t *crc)
{
return write_out_data(outfile, (uint8_t *)desc,
@@ -458,6 +460,29 @@ write_out_desc(FILE *outfile, struct mylo_fw_blockdesc *desc, uint32_t *crc)
int
+write_out_padding(FILE *outfile, size_t len, uint8_t padc, uint32_t *crc)
+{
+ uint8_t buff[512];
+ size_t buflen;
+
+ memset(buff, padc, buflen);
+
+ buflen = sizeof(buff);
+ while (len > 0) {
+ if (len < buflen)
+ buflen = len;
+
+ if (write_out_data(outfile, buff, buflen, crc))
+ return -1;
+
+ len -= buflen;
+ }
+
+ return 0;
+}
+
+
+int
write_out_file(FILE *outfile, struct fw_block *block, uint32_t *crc)
{
char buff[FILE_BUF_LEN];
@@ -495,7 +520,7 @@ write_out_file(FILE *outfile, struct fw_block *block, uint32_t *crc)
if (len < buflen)
buflen = len;
- // read data from source file
+ /* read data from source file */
errno = 0;
fread(buff, buflen, 1, f);
if (errno != 0) {
@@ -510,6 +535,11 @@ write_out_file(FILE *outfile, struct fw_block *block, uint32_t *crc)
}
fclose(f);
+
+ /* align next block on a 4 byte boundary */
+ len = ALIGN(len,4) - block->size;
+ if (write_out_padding(outfile, len, 0xFF, crc))
+ return -1;
dbgmsg(1,"file %s written out", block->name);
return 0;
@@ -575,6 +605,7 @@ write_out_blocks(FILE *outfile, uint32_t *crc)
{
struct mylo_fw_blockdesc desc;
struct fw_block *b;
+ uint32_t dlen;
int i;
/*
@@ -597,15 +628,22 @@ write_out_blocks(FILE *outfile, uint32_t *crc)
*/
for (i = 0; i < fw_num_blocks; i++) {
b = &fw_blocks[i];
+
+ /* detect block size */
+ dlen = b->size;
+ if ((b->flags & BLOCK_FLAG_HAVEHDR) != 0) {
+ dlen += sizeof(struct mylo_partition_header);
+ }
+
+ /* round up to 4 bytes */
+ dlen = ALIGN(dlen, 4);
+
+ /* setup the descriptor */
desc.type = HOST_TO_LE32(FW_DESC_TYPE_USED);
desc.addr = HOST_TO_LE32(b->addr);
+ desc.dlen = HOST_TO_LE32(dlen);
desc.blen = HOST_TO_LE32(b->blocklen);
- if ((b->flags & BLOCK_FLAG_HAVEHDR) != 0) {
- desc.dlen = HOST_TO_LE32(b->size +
- sizeof(struct mylo_partition_header));
- } else {
- desc.dlen = HOST_TO_LE32(b->size);
- }
+
if (write_out_desc(outfile, &desc, crc) != 0)
return -1;
}