PW5 the browser in 5.16.4 is chromium

[ShdHrzn]

today i notice the news about update 5.16.4 and the browser html5 support update.
then i found some info about chromium files and exec commandline param things after download update_kindle_all_new_paperwhite_11th_5.16.4.bin and extract it .

SOME INFO:

1. important file path in rootfs.img.gz is : /usr/bin/browser, /usr/bin/chromium, /usr/bin/chromium.sqsh
2. /usr/bin/browser is a bash script.
   • where is the official ui call it? the ui java code?
   • when chromuim.sqsh mount to /usr/bin/chromium ?
   • and what is this name with ipc command "lipc-set-prop" do about launch chromium process?
   • its different with browser process ps output in 5.16.2.1.1 like "/usr/bin/mesquite -l com.lab126.browser -c file:///var/local/mesquite/browser/ -j" . can i just put these files in 5.16.2.1.1 and run the script to use modern browser? if yes, Is there anything I need to be careful about?
   
   

   #!/bin/bash
   
   lipc-set-prop -s "com.lab126.chromebar" "activityIndicator" "{   \"activityIndicator\": {\"clientId\": \"com.lab126.browser\",\"action\": \"start\",\"text\": \"\",\"timeout\": 30000}}"
   
   export XDG_CONFIG_HOME="/mnt/us/system/browser/"
   if [ -d $XDG_CONFIG_HOME ]
   then
       CACHE_SIZE=`du -s /mnt/us/system/browser/ | awk -F '[/ ]' '{print $1}'`
       CACHE_LIMIT=65536
       if [ $CACHE_SIZE -gt $CACHE_LIMIT ]
       then
           rm -rf /mnt/us/system/browser/*
       fi
   fi
   
   export LD_LIBRARY_PATH="/usr/bin/chromium/lib:/usr/bin/chromium/usr/lib:/usr/lib/"
   
   exec chroot /chroot /usr/bin/chromium/bin/kindle_browser --no-zygote --no-sandbox --single-process --skia-resource-cache-limit-mb=64 \
        --disable-gpu --in-process-gpu --disable-gpu-sandbox --disable-gpu-compositing \
        --enable-dom-distiller --enable-distillability-service --force-device-scale-factor=2 --js-flags="jitless" \
        --content-shell-hide-toolbar --content-shell-host-window-cord=0,215 \
        --force-gpu-mem-available-mb=40 --enable-low-end-device-mode --enable-low-res-tiling --disable-site-isolation-trials \
        --user-agent="Mozilla/5.0 (X11; U; Linux armv7l like Android; en-us) AppleWebKit/531.2+ (KHTML, like Gecko) Version/5.0 Safari/533.2+ Kindle/3.0+"

3. /usr/bin/chromium is a empty directory and browser executable files in chromium.sqsh:
   

   usr/bin/chromium.sqsh: Squashfs filesystem, little endian, version 4.0, zlib compressed, 47645206 bytes, 53 inodes, blocksize: 131072 bytes, created: Fri Oct  6 11:42:21 2023

4. after "unsquashfs chromium.sqsh" , here is file tree in it:
   

   √ squashfs-root % tree
   .
   ├── bin
   │** ├── icudtl.dat
   │** ├── kindle_browser
   │** ├── kindle_browser.pak
   │** ├── natives_blob.bin
   │** └── v8_context_snapshot.bin
   ├── etc
   │** └── fonts
   │**     ├── conf.avail -> /etc/fonts/conf.avail
   │**     ├── conf.d
   │**     │** ├── 20-fix-globaladvance.conf -> ../conf.avail/20-fix-globaladvance.conf
   │**     │** ├── 20-unhint-small-vera.conf -> ../conf.avail/20-unhint-small-vera.conf
   │**     │** ├── 30-metric-aliases.conf -> ../conf.avail/30-metric-aliases.conf
   │**     │** ├── 30-urw-aliases.conf -> ../conf.avail/30-urw-aliases.conf
   │**     │** ├── 40-nonlatin.conf -> ../conf.avail/40-nonlatin.conf
   │**     │** ├── 45-latin.conf -> ../conf.avail/45-latin.conf
   │**     │** ├── 48-chromium-local.conf
   │**     │** ├── 49-sansserif.conf -> ../conf.avail/49-sansserif.conf
   │**     │** ├── 50-user.conf -> ../conf.avail/50-user.conf
   │**     │** ├── 51-local.conf -> ../conf.avail/51-local.conf
   │**     │** ├── 60-latin.conf -> ../conf.avail/60-latin.conf
   │**     │** ├── 65-fonts-persian.conf -> ../conf.avail/65-fonts-persian.conf
   │**     │** ├── 65-nonlatin.conf -> ../conf.avail/65-nonlatin.conf
   │**     │** ├── 69-unifont.conf -> ../conf.avail/69-unifont.conf
   │**     │** ├── 80-delicious.conf -> ../conf.avail/80-delicious.conf
   │**     │** └── 90-synthetic.conf -> ../conf.avail/90-synthetic.conf
   │**     ├── fonts.conf -> /etc/fonts/fonts.conf
   │**     └── fonts.dtd -> /etc/fonts/fonts.dtd
   ├── files
   │** └── fonts
   │**     ├── NotoSansJP-Medium.ttf
   │**     └── system_fonts -> /usr/java/lib/fonts/
   ├── lib
   │** ├── ld-linux-armhf.so.3
   │** ├── libc.so.6
   │** ├── libdl.so.2
   │** ├── libnss_compat.so.2
   │** ├── libnss_db.so.2
   │** ├── libnss_dns.so.2
   │** ├── libpthread.so.0
   │** ├── libresolv.so.2
   │** ├── librt.so.1
   │** └── libSegFault.so
   └── usr
       └── lib
           ├── libatk-bridge-2.0.so.0
           ├── libatspi.so.0
           ├── libgio-2.0.so.0
           ├── libglib-2.0.so.0
           ├── libgmodule-2.0.so.0
           ├── libgobject-2.0.so.0
           └── libgthread-2.0.so.0
   
   11 directories, 42 files

5. exec binary file :
   

   √ squashfs-root % file bin/kindle_browser
   bin/kindle_browser: ELF 32-bit LSB shared object, ARM, EABI5 version 1 (SYSV), dynamically linked, interpreter /usr/bin/chromium/lib/ld-linux-armhf.so.3, for GNU/Linux 3.2.0, BuildID[sha1]=60011b78f6e48771982578609636ea71e9b714c4, stripped
   √ squashfs-root % ldd bin/kindle_browser
           not a dynamic executable

then i got a silly question than can we just pack this for other system version , like 5.16.2.1.1 ?
cause i just jailbreak my kpw5 in this version
and the binary executable file "kindle_browser" ldd result said not dynamic
and some lib file like LD_LIBRARY_PATH env variable in /usr/bin/browser bash script.

i don't want to copy and try to run it directly in my device before i got some advice in here , because some chroot word in browser script file and i'm not familiar with kindle system (just got jailbreak and thanks you guys work)

[escalion]

You won't be able to copy over and execute the binary as the new firmware is using a hard float ABI and the old firmware wasn't.

[NiLuJe]

The chromium squash ships with a full glibc chroot though, so assuming it's set-up as intended, that's less of an issue than it could be.

[escalion]

Originally Posted by NiLuJe

The chromium squash ships with a full glibc chroot though, so assuming it's set-up as intended, that's less of an issue than it could be.

True, although I'm unaware if there was a kernel update and if the old kernel had CONFIG_VFP enabled. If it does, then there shouldn't be much of a reason for it not to work, assuming it doesn't try to load any dynamic libraries from outside of the squashfs.

No harm in giving it a go.

[NiLuJe]

I remember @knc1 shipping a hardfp chroot ages ago, so that shouldn't be an issue .

[Marek]

Originally Posted by escalion

True, although I'm unaware if there was a kernel update and if the old kernel had CONFIG_VFP enabled. If it does, then there shouldn't be much of a reason for it not to work, assuming it doesn't try to load any dynamic libraries from outside of the squashfs.

No harm in giving it a go.

Bricked my kindle while trying it, i probably did something really dumb somewhere (?) even tho to me it seemed i only mounted and symlinked a few files into a new folder i made.

[escalion]

Originally Posted by Marek

Bricked my kindle while trying it, i probably did something really dumb somewhere (?) even tho to me it seemed i only mounted and symlinked a few files into a new folder i made.

You shouldn't have had to symlink anything - just mount the squash and enable the chroot.

By symlinking you have introduced that ABI issue I spoke about.

You might be able to get into recovery from u-boot and reinstall the rootfs or undo the damage (requires some disassembly and soldering).

[escalion]

Originally Posted by escalion

You shouldn't have had to symlink anything - just mount the squash and enable the chroot.

By symlinking you have introduced that ABI issue I spoke about.

You might be able to get into recovery from u-boot and reinstall the rootfs or undo the damage (requires some disassembly and soldering).

Are you able to attach a serial cable and provide the boot logging output?

[Marek]

Originally Posted by escalion

Are you able to attach a serial cable and provide the boot logging output?

I will need to get a soldering iron but i will see what I can do

[Marek]

Originally Posted by escalion

Are you able to attach a serial cable and provide the boot logging output?

From the logs it seems that /sbin/init is gone

[escalion]

Originally Posted by Marek

From the logs it seems that /sbin/init is gone

That's pretty wild, what commands did you run?
Can you drop a paste in of a boot log?

[Kass401]

So, is there any way to put the new browser onto an older firmware version, then?

[frawang]

Originally Posted by Marek

From the logs it seems that /sbin/init is gone

so are there any ways to do jailbreak for this version

[ArchGryphon9362]

Originally Posted by Marek

From the logs it seems that /sbin/init is gone

How do you even- This man just deleted System32