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Fix potential unligned access with MyLoader based devices, thanks Juhos

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@6659 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
florian 2007-03-24 10:22:53 +00:00
parent 143496aa4d
commit b33efd033e
1 changed files with 46 additions and 8 deletions
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54
tools/firmware-utils/src/mkmylofw.c
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@ -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,
@ -457,6 +459,29 @@ 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)
{
@ -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;
}