Patch Failed (Samsung SM-A530F) (4.4.302-p6-Eureka_R25U)
维护者通常 4 天内回复
@bmax121 已经在做这个了。
开始于 2026年7月31日。
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描述
I worked with an AI and it gave me this output here. kallsyms.txt is the first part of the output, the second part is also here.
zcat /proc/config.gz | grep KALLSYMS
CONFIG_KALLSYMS=y
# CONFIG_KALLSYMS_ALL is not set
Here is the kernel file:
kptools fails with "kernel image magic error" when ARM64 header magic sits at 0x30
Summary
kptools rejects a valid arm64 kernel because it looks for the ARMd magic
(0x644D5241) only at offset 0x38. On this kernel the magic is at 0x30, so
patching aborts before any analysis starts.
Device / build
| Device | jackpotlte (Samsung Galaxy A8 2018, SM-A530F) |
| SoC | Exynos 7885 |
| ROM | XROM V161 (Android 16 base) |
| Kernel | 4.4.302-p6-Eureka_R25U |
| Toolchain | Neutron clang 18.0.0git |
| Build date | Wed Jun 17 06:27:23 KST 2026 |
| Boot header | version 0, pagesize 2048, Samsung SEANDROID footer present |
Kernel header dump
First 64 bytes of the unpacked kernel (from magiskboot unpack):
00000000 10 00 00 14 00 00 00 00 00 00 08 00 00 00 00 00
00000010 00 20 D1 01 00 00 00 00 0A 00 00 00 00 00 00 00
00000020 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000030 41 52 4D 64 00 00 00 00 1F 20 03 D5 1F 20 03 D5
Decoded:
0x00code0=0x14000010=b #0x40, so execution starts at0x400x08text_offset=0x800000x10image_size=0x01D120000x18flags=0x0A(little endian, 4K pages)0x30ARMdmagic0x38and0x3C=d503201f(NOP), never executed
The header carries one fewer reserved 64-bit field than the layout in
Documentation/arm64/booting.rst, which shifts magic from 0x38 to 0x30.
This comes from a modified arch/arm64/kernel/head.S in the ROM's kernel source.
Workaround confirmed
Writing a second copy of the magic into the unused NOP slot at 0x38 lets
kptools proceed past header validation. File size is unchanged and the kernel
still boots to the same point, since code0 branches over that region.
printf '\101\122\115\144\000\000\000\000' | \
dd of=kernel bs=1 seek=56 conv=notrunc
After this, kptools reads the header, resolves linux_banner, kernel version,
and both kallsyms token tables. (It then fails for a separate reason, filed
upstream — see the other report.)
Suggested fix
Instead of reading the magic at a fixed 0x38, scan the first 64 or 128 bytes in
4-byte steps for 0x644D5241 and derive the header layout from where it is
found. This keeps standard kernels working and accepts variants like this one.
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