marin-m/vmlinux-to-elf

Problem with Android 10/11 Xiaomi device

TheScarastic opened this issue · 6 comments

TheScarastic commented

I am facing assertion error with xiaomi k20pro

i printed a few values and those were

kallsyms_markers_entries = 8034917443174400
self.offset_table_element_size = 8
position = -8034917414015472

Link to kernel https://git.rip/dumps/xiaomi/raphael/-/blob/raphael-user-11-RKQ1.200826.002-20.12.28-release-keys/bootimg/kernel

  File "./kallsyms-finder", line 1116, in <module>
    kallsyms = KallsymsFinder(obtain_raw_kernel_from_file(kernel_bin.read()), args.bit_size)
  File "./kallsyms-finder", line 209, in __init__
    self.find_kallsyms_names()
  File "./kallsyms-finder", line 775, in find_kallsyms_names
    assert position > 0
AssertionError
marin-m commented

Hello,

It was because there was an extra (apparently Qualcomm-specific) kernel header of 20 bytes at the beginning of the file (UNCOMPRESSED_IMG + a four-byte file offset to a DTB specification) that made the image contents no longer aligned on 8 bytes, even though it was present uncompressed.

I have added support for stripping this header when present in commit 9f1d6ca. The kernel is now successfully processed.

Regards.,

  • 👍2
TheScarastic commented

@marin-m sorry to trouble again but issue is back again with latest builds here is the link of boot.img https://drive.google.com/uc?id=1kHwXHJltHRm39AnVrRKu_t4n0CLTXYgu&export=download

marin-m commented

Hello,

This is not a Linux kernel, this a full Android boot image. You can understand that is is the case through using a file type identifying command such as file, a signature searcher such as binwalk or an hexadecimal editor such as hexedit.

$ file /tmp/boot.img
/tmp/boot.img: Android bootimg, kernel (0x8000), page size: 4096, cmdline (console=ttyMSM0,115200n8 earlycon=msm_geni_serial,0xa90000 androidboot.hardware=qcom androidboo)

For instructions on how to unpack an Android boot image in order to extract the kernel, you may find this useful: https://unix.stackexchange.com/questions/64628/how-to-extract-boot-img

Regards,

TheScarastic commented

@marin-m i tried on kernel as well but issue remained same

TheScarastic commented

nvm sorry locally didn't pulled to latest commit 😢