Development [Kernel][07.05.2022][Android 12] Kirisakura 2.0.0 for Asus ROG Phone 5 aka "Anakin"

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Jan 2, 2011
If I wish to return back to stock, should I flash the original images in the sequence below?
  1. fastboot flash boot boot.img
  2. fastboot flash dtbo dtbo.img
  3. fastboot flash vendor_boot vendor_boot.img
Pls correct me if there is any mistake in the commands above. Thanks.

Looks good 👍

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  • 1
    Update to 2.0.0

    Hey guys and girls,

    Alright so here´s the next update, which adds support for Android 12.

    Works fine on 31.0810.1226.77 WW firmware on a standard ROG 5 for the past weeks.
    5S, Pro, Ultimate are all untested. Feel free to flash and report if it boots for you. (to return back to stock flash back stock boot.img, dtbo.img and vendor_boot.img via fastboot, which can be obtained from the stock firmware via payload extractor)

    After flashing the there will be a magisk module in magisk manager called AK3 Helper Module. Do not delete it.

    The link to the latest WW firmware can be found following this link.

    More changes in the Changelog below:

    - Rebase entire kernel on 31.0810.1226.77
    - Linux-Stable upstream bumped to 5.4.190
    - use prebuilt clang 14.0.5
    - all previous features should be kept intact
    - CAF-Upstream to latest
    - MGLRU added (info here and here)
    - update f2fs fsck spoof
    - other improvements and tweaks please check github


    Instructions can be found in the OP!
    But look at this post too :)

    Have fun, enjoy the kernel and your phone.

    Donations are not mandatory but very welcome.
    If you like my work and want to buy me a coffee/green tea to keep development going:
    Hey there, I'll he using my phone stock for a while still but just wanted to say congrats for the new release and thanks for supporting the phone!
  • 8
    Kirisakura-Kernel for the ROG Phone 5

    Hello everyone,

    To keep it short: Here is Kirisakura - Kernel for the Asus ROG Phone 5 aka Anakin. The ROG Phone line-up internal codenames are traditionally derived from Yedi-Characters of the Star Wars universe. Three years ago the 1st gen ROG Phone bore the generic title "Yedi", the ROG Phone 2 was codenamed "Yoda" and the Rog Phone 3 bore the title "Obiwan".
    I would appreciate if everybody that flashes the kernel, reads at least once through this opening post and the following ones.

    Kirisakura - Kernel is designed to bring a handful of beneficial features to the device, while ensuring excellent performance and smoothness to get you safely through the day!
    If you expect a custom kernel to magically improve your devices battery life manifold and this is your only priority then this might not be the right place for you.
    However the kernel is built to keep battery life close to the same as you would experience the on stock kernel while being tuned to perform better in various UI related benchmarks. The same benches are used by google to verify and ensure UI smoothness on the Pixel devices. The scheduler is tuned to yield lower jitter and reduce jank frames.
    There´s also a cpu-battery saver mode that cuts back the CPU max- freqs, but without the disadvantages like delayed notifications from built into the system user-space power-saving modes.
    If that got your curious, I welcome you to continue reading if you´re still interested!

    This project aims to keep most of the subsystems updated, way ahead of the stock kernel, thereby improving security and performance, while keeping stability as the foucs during testing! This includes Linux-Stable, CAF-Upstream and kernel/common.

    A very positive development. Google pushed for CFI and SCS to be enabled by default in the android-common kernel. In this years generation ( 5.4 linux kernel base/ SD 888 ) CFI and SCS are enabled by default. It was a lot of work to get these features working nicely on the kernels I did develop on for the past few year. So it´s nice to see this is now there by default in everybody can profit from it.
    I put the explanations and links in hide tags here.

    Kernel Control Flow Integrity (Kernel-CFI), which is achieved by linking the kernel with LLD and Link Time Optimization (LTO), more precisely ThinLTO, are quite unique security features.
    The recently released Kirisakura-Kernel for the OnePlus 8 Pro was featured on the XDA-Portal due to the inclusion of CFI. The featured article explains CFI in great details, is easy to understand and definitely worth to read.
    If possible the latest Kirisakura-Kernel releases for various devices aim to include CFI in enforcing mode so users can benefit from this security features.

    Another security feature is Shadow Call Stack (SCS).
    SCS is another security patchset that is aimed at preventing attacks via return oriented programming (ROP).
    ROP is a technique where the attacker gains control of the kernel stack to overwrite function return addresses and redirect execution to carefully selected parts of existing kernel code.
    If you´re interested here are a few good links:
    Google Security Blog explaining SCS.
    LLVM doc about SCS
    Android DOCs documenting SCS

    If reading about linux or caf/qcom upstream in the paragraph above got you curious, have a read about Linux-Stable and why it is important here. The stable-process is not the same for every subsystem, but the general idea, rule of thumb and benefits are applicable for other subsystems as well.
    Read more about the Release-Model following this link.
    This conversation on the LKML mailing list also shows the power of Linux-Stable and why it´s very beneficial to not just say it´s not worth and a potentiol source for bugs:
    Starting with the Initial Message , the following reply and a good summarizing statement.

    Quick explanation of CAF-Upstream. CAF is short for Codeaurora-Forums. This is the place where development from Qualcomm for their SoCs happens. This includes the Snapdragon 888 that´s built into the different SKUs of the ROG Phone 5.
    The kernel-bases available on the Codeaurora-Forums, are basically the foundations OEMs use, to build their own kernel additions on top for devices featuring Qualcomm SoCs.
    The Qualcomm developers push regular updates to the bases of the different SoCs, a bit similar to how Linux-Upstream works. OEMs usually stop updating the initial base after the phone is released.
    This kernel focuses amongst the other features to provide the latest CAF-Updates merged in a regular manner, to provide updates, improvements and enhancements for SoC specific drivers and subsystems! This might take a while, because a lot of device specific testing is done on my end to ensure stability.

    The kernel includes a lot of improvements and contributions from other developers as well. Without this kernel would not exist.
    A big part of improvements originate from @arter97´s, @kdrag0n´s and @Sultanxda´s work. Many others contributed in some way or another to this kernel.
    A big thanks to all of them at this place!

    Now lets continue with a list of features in the next paragraph!

    Main Features:
    - Based on latest kernel sources from Asus for Android 11 and intended to be used on the latest Asus Stock-Firmware (currently 18.0840.2112.210)
    - compiled with Clang 13.0.1 and built with -O3 speed optimizations
    - Linux-Stable-Upstream included to 5.4.166
    - upstreamed CAF base for the Snapdragon 888 (qcoms internal codename "lahaina")
    - include important fixes/improvements from kernel/common
    - tune scheduler for improved jitter and less jank frames
    - reduce power consumption during deep sleep
    - remove logging while device is suspended
    - remove sleep debugging from Asus for release build
    - disable various debugging mechanisms for drivers which are not needed on a perf build (for example touchscreen, fingerprint reader, display, binder)
    - disable various debugging configs, that are not needed in a perf kernel build according to google.
    - disable selinux auditing (we don´t have to adress selinux denials running a stock rom)
    - display tweaks to reduce power consumption on statically rendered images
    - disable unnecessary CPU errata for our specific SoC
    - disable per cgroup pressure tracking to reduce overhead
    - free up RAM by removing reserved mem regions used only for debugging
    - implement LRNG (thanks @arter97, see arter kernel OP for more info )
    - Flashing the kernel will keep root!
    - Flashable via EXKM, FKM or TWRP (if available) on a rooted system!
    - Anykernel zip is based on the Anykernel3 release from @osm0sis

    EAS related features:
    - Implement dynamic WALT-Window size depending on current FPS, collecting information about CPU-Load to provide more precise information for the scheduler
    - EAS implementation patched up to latest CAF state
    - updates from kernel/common
    - scheduler updates from sd888/ 5.4 kernel
    - scheduler update from sony xperia 1 III kernel aiming to improve WALT

    CPU related features:
    - Power saving workingqueues enabled by default (toggleable in EXKM)
    - Change various drivers (WLAN, MM, audio, charger, power, thermal, glink etc) to use power efficient workingqueues. This compliments EAS in general
    - improvements to cpufreq/times/stats
    - vdso32 patches as found on Google Pixel devices (brief documentation here) (CAF 5.4 default, keep for documentation)
    - remove event debug logging
    - disable broken irq detection, disable debugmon
    - improve suspend/resume from audio driver (caf-upstream for audio-kernel)
    - cpuidle: wake only cpus for which qos has changed (this allows cores to keep idle states better)
    - disable debugging during sleep states as per qcom recommendation
    - remove RTB logging to reduce overhead
    - disable trace_printk as it shouldn´t be used on production/perf kernel builds
    - disable edac and coresight (following google on the pixel kernels)
    - disable jtagv8 debugging as recommended by qcom for perf builds to avoid potential power, performance and memory penalty
    - disable s2idle in favor of deep idle state -> improves deep sleep drain (google initially used 2idle for improved suspend/resume latency on pixel 3 and pixel 4, but disabled it on pixel 5. qcom followed suit for sd 888, but apparently didn´t see google reverting it on pixel 5. Other OEMs such as Xiaomi or OnePlus already disabled s2idle on their SD888 devices in favor of deep- read more about s2idle vs deep here)
    - raise LTO-inlining -> more info

    GPU related features:
    - GPU driver updated to latest CAF-State
    - gpu/kgsl improvements from pixel 4/pixel 5 kernel
    - add low_prio_worker thread for gpu driver (Improves performance when tearing down processes (eg, via LMK) and not blocking currently running UI from submitting work to the GPU
    - remove POPP functionality from GPU driver to avoid constant fight about downscaling with msm-adreno-tz
    - increase gpu worker thread priority
    - don´t wait for fenced GMU writes

    File System related features:
    - upstream BFQ-MQ to latest state in linux-mainline and default to 128KB readahead
    - improve memory allocations in kernfs
    - ufs improvements from pixel 4/ pixel 5 kernel
    - improve GC as to not interfere while user interaction is happening and prevent possible jitter or latency spikes
    - improvements to deep sleep power consumption (ufs driver, auto hibernate)

    Audio related features:
    - provide option to override audio profile based on impedance measurement (run 16ohm headphones in 64ohm mode, dangerous use with caution!)
    ----> more information/explanation how to control the feature linked here

    Display related features:
    - Backlight Dimmer (reduce minimal brightness below stock limit)

    Network related features:
    - Wireguard Support (Details)
    - advanced TCP algorithms enabled
    - use bbr as default TCP congestion algorithm (fasted algo according to this excellent research from @kdrag0n found here )
    - improved networking drivers from caf-upstream (especially wifi)
    - remove unnecessary wakelock from WLAN driver to reduce thousands of very short wakeups during a 7 hour deep sleep period
    - improved bluetooth performance (¹, ²)
    - Enable support for TTL spoofing

    Memory related features:
    - Speculative Page Faults left enabled (1. 2) (CAF 5.4 default, keep for documentation)
    - Fix various memory leaks in different subsystems
    - improved mm with patches from mainline
    - patches from kernel/common
    - improve memory allocations in various subsystems, video encode/decode, kernfs, cgroup
    - Backport to enable CONFIG_HAVE_MOVE_PMD (see here) , thanks @arter97
    - Backport to enable CONFIG_HAVE_MOVE_PUD (commit here) , thanks @arter97
    - free more RAM by removing unused reserved memory regions
    - mm: Micro-optimize PID map reads for arm64 (improves game performance, especially unity based games such as genshin impact)

    Security related features:
    - Control-Flow-Integration (CFI) and Link-Time-Optimization (LTO) (CAF 5.4 default, keep for documentation)
    - Use ThinLTO which was first used in the Pixel 4 XL Android R-Kernel instead of full LTO (CAF 5.4 default, keep for documentation)
    - Shadow Call Stack (SCS) Security-Feature ( 5.4 default, keep for documentation)
    - enable init_on_alloc for even more security, more information can be found in the commit message (CAF 5.4 default, keep for documentation)

    Misc Features:

    Wakelock Blocker:
    - advanced wakelock blocker with the ability to block any wakelocks (dangerous, use with caution)
    - please read [URL=""]this for further info
    - blocking a kernel wakelock should only be done in case of firmware incompatabilities (WiFi network at work (can´t be changed) causes deep sleep to not work on the phone.) That´s the only use case I see for this feature. The kernel does not features this to improve battery life!

    Other features:
    - clean up asus drivers and fix a few warnings in kernel log
    - disable logging and debugging to make the kernel more lightweight in various places (includes binder, mm, vma, gpu, ipa etc)
    - fix several coding issues detected by newer Clang-Toolchains
    - enlarge dmesg size to ease debugging

    Flashing Guide, Download and Changelog

    - unlocked Bootloader (this will void warranty and kill future OTA updates on all asus phones at the moment)
    - USB-Debugging in developer options enabled
    - latest adb and fastboot binaries
    - working adb and fastboot environment
    - magisk root
    - a backup of stock boot.img, vendor_boot.img and dtbo.img so you can go back to stock conditions (simplest way is TWRP or to extract from stock firmware)

    How to flash the Kernel:
    1. Download the latest and make sure you have properly updated to the latest matching Asus Stock-Firmware (check the feature list for the current firmware the source is based on). When the ROG Phone 5 receives an OTA update it takes Asus a while to release the source code for the new OS and me a while to build a new kernel. If you don´t want to face any issues, wait until I either release an updated kernel or give green light because there were no kernel changes.
    Always make sure to run the firmware the kernel is built for!
    If you feel adventurous and try in advance, make sure you have a backup ready!

    2. Flash the via latest TWRP (if available), EXKM or FKM app and do a full reboot.
    2a. Important: If flashing the kernel via TWRP, flash the DLKM magisk module found in the download folder that matches the kernel version.

    3. Reboot and profit.

    Download is located always in this folder:

    Important: Read after Download
    Please take a look at the second post after flashing the kernel!

    Android 11

    1.0.0 Initial Release

    Android 12

    Donations are not mandatory but very welcome if you want to support development or just buy me a coffee/tea :)
    If you like my work:

    Asus for the development device, giving me the opportunity to create this project!
    @osm0sis for all his work, including the ak3 installer!
    @tbalden for being the best HTC, Pixel, OnePlus and now Asus wingman!
    @LeeDroid and @mwilky for their awesome roms and work I used on multiple devices!
    @Captain_Throwback for all the mentoring and guidance!
    @Eliminater74 for bringing me into the game and the Inspiration
    @nathanchance for his upstream guidance and assistance
    @RenderBroken for helping me out
    @flar2 for all his work
    @joshuous for all the help he provided to me in the past!
    @arter97 for giving me advice
    @kdrag0n for his help and advices!
    @topjohnwu for magisk!

    Source Code:

    Is root preserved when flashing this kernel?
    Answer: Yes, the will detect root and keep it.

    Question: Safetynet does not pass on my phone since I unlocked the phone, why is this so?
    Answer: Google introduced hardware backed attestation recently. Unfortunately the old kernel tricks to still get safetynet passing won´t work. Instead you will have to rely on some magisk modules. Short guide in post #4 below.

    Question: How do I return back to stock or another kernel.
    Answer: Extract boot.img, vendor_boot.img as well as dtbo.img from matching firmware you are on (you can do so by using this tool or similar ones found on XDA and when googling around) and flash them via fastboot. If you want to keep root flash back the magisk_patched_boot.img. Or dirty flash your rom and re-root.

    Question: Why is having Magisk installed mandatory for this kernel?
    Answer: The kernel uses a ramdisk overlay to apply some settings after boot. If you are not rooted these settings will not get applied and you miss some of the optimizations.

    Question: How to report bugs properly?
    Answer: Have a look at post #3 in the linked thread. The linked guide is a pretty good starting point.
    Before reporting any bug make sure you´re running on a stock configuration. That´s means you´re not using any mods, tweaks in kernel managers or other root tweaks , magisk modules, scripts or other modifications that alter various functions like sound mods, data traffic, sleeping behaviour, scheduler, magical battery tweaks etc.
    Try to describe the issue as detailed as possible! Give your exact setup, like rom, magisk version, kernel version.
    Is the issue reproducible? Does it happen frequently?
    Provide logs, otherwise debugging is a lot harder. If you can already reproduce the issue and provide logs it greatly limits the amount of time I have to spent until I figure out how to reproduce it.

    If the device force reboots/randomly reboots (that means you see the bootloader unlocked screen!) provide a .zip of /asdf.
    Easiest way is immediately after booting up, with a root explorer navigate to /asdf. Copy the contents to your internal storage, zip it up and send it to me.

    If the issue happens while the device is running provide a dmesg plus a logcat that you take while/shortly after the issue happens. This will log what´s running in the current session. Try to be as detailed as possible what´s happening when the issue appears. It will also help me in reading the log!
    Update to 1.1.0

    Hey guys and girls,

    I hope everyone is having a good day or starting into one. Here´s the next update.
    I forgot to include wireguard in the release. That´s now added.

    Since we´re not building a QGKI kernel, but rather a standalone kernel an important config that feeds information to the powerhal daemon didn´t get fully built, since the QGKI dependency wasn´t met. This resulted in lags in games like NieR.

    Also fix certain games like 7DS (com.netmarble.nanagb) crashing frequently on startup.

    thanks to @twistedumbrella for reporting the bugs and noticing wireguard missing.

    More changes in the Changelog below:

    - add wireguard
    - enable qgki part of msm_performance to fix lags in certain games
    - fix some games ( for example 7DS (com.netmarble.nanagb)) frequently crashing during startup


    Instructions can be found in the OP!
    But look at this post too :)

    Have fun, enjoy the kernel and your phone.

    Donations are not mandatory but very welcome.
    If you like my work and want to buy me a coffee/green tea to keep development going:
    How to pass Safetynet after unlocking the bootloader

    With the introduction of hardware backed safetynet attestation, passing safetynet has become a lot more complicated.
    Some probably remember a while ago, flashing a kernel that forced some flags was enough to pass it. However these days are gone.
    Below is a short guide how to pass safetynet on phones that are flagged to use HW attestation (such as the ROG 5).

    1. Make sure you´re running latest magisk canary.
    2. In Magisk Manager enable both zygisk and deny list.
    4. Download the latest Universal Safety Net Fix from @kdrag0n ´s github for zygisk cand flash it in Magisk Manager. Reboot.
    5. Profit
    I was trying to give you a pass, but I can take it back if you didn't want it lol. Pretty sure I know which config you are talking about. I had wondered why it wasn't enabled, so that explains it.

    The ROG Phone 5 is super finicky. It doesn't help that they released two (or three, depending where you're from) models and then immediately pushed out a second series with two more. All of them have slightly different hardware that Asus is trying to keep on a single code base.

    has a bunch of tactile (effect) UI components that make it easy to pick out the lag.

    I pushed my source :) I took the pass don´t worry. :)

    CONFIG_MSM_PERFORMANCE_QGKI needs to be explicitly enabled.
    For some reason when extracting the defconfig from boot.img or from /proc/config.gz and using that to build the kernel it doesn´t get enabled.
    It seems there´s a lot for me to be learned about CAFs QGKI build "system". There might be more surprises.

    Yes, the ROGs are super finicky I completely agree.

    I´ll check the game and bluetooth on my end. thanks :)