sekaiacg
Does not unpack Amlogic S905X5M firmware images
Hello. Neither system nor vendor from the Amlogic S905X5M firmware wants to be unpacked. Vendor image The image is not mounted via mount, only via erofsfuse.
https://github.com/torvalds/linux/blob/5723cc3450bccf7f98f227b9723b5c9f6b3af1c5/fs/erofs/decompressor_deflate.c#L64-L67
if (dfl->windowbits > MAX_WBITS) {
erofs_err(sb, "unsupported windowbits %u", dfl->windowbits);
return -EOPNOTSUPP;
}
The compression format parameters used by this erofs image were modified or corrupted.
If you need to extract files, try the built-in f2fs.erofs in the firmware, where the parameter --extract=out is similar to -o out.
If you need selinux context, you can use the --only-cfg parameter in extract.erofs,Only extracting configuration information will not cause errors.
We got root and pulled out the erofs utilities from there: dump, fsck mkfs. When running fsck.erofs, we saw that there is some "crypto" compression algorithm.
Searching the Internet, I could not find any information on this matter, except for some patch, which was offered, perhaps, by an AMLOGIC employee.Link on the info
There is a fork on GitHub that can be merged with your extractor. Please add it to your extractor.
Can confirm this crypto algorithm applies for a few devices across AMLogic chipsets (S904X and S905X)
Any update or progress for this?
