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Siglent .ads firmware file format
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ian.ameline:

--- Quote from: janekivi on June 12, 2018, 03:47:48 pm ---OK, but this time it may be bit tricky.
In normal update like SDS1004X-E_6.1.25R2 you don't see any passwords or anything else.
But they have released Operating System -V1 (Only For 4-Channel) update and there is
all the root file system for example. So looking into rootfs.cramfs in \etc\ is shadow. Now we
need to repack it after change and do the Operating System update again.
May be it is possible...
Otherwise my Radeon R9-390 decodes only 80000 passwords in sec - that may take years.

--- End quote ---

Yes -- I was assuming it would be the OS update that is modified to substitute a known password for the root account. (as was done for the SDG)
I'm fairly technically experienced -- many years of compiler development on unix platforms.
Cracking the password itself in less than years is not a good bet assuming they didn't chose a word in a dictionary.




janekivi:
I see the cramfs can be made with mkfs.cramfs. You unpack all files and then generate new cramfs
from new files. There is many options and we need know what format it needs to be exactly.
http://manpages.ubuntu.com/manpages/bionic/man8/mkfs.cramfs.8.html
Update is done during the startup so may be the wrong file don't kill it much and during next
startup we can try other file and so on...
janekivi:
This way I don't need to do anything.
You can take the update
https://www.siglentamerica.com/service-and-support/firmware-software/digital-oscilloscopes/#sds1000x-e-series
Unpack rootfs.cramfs file (with 7zip for example).
Generate new password for root (and siglent)
https://quickhash.com/crypt3-sha512-online
Replace shadow file, then pack new rootfs.cramfs together with mkfs.cramfs your_filesdir rootfs.cramfs
Then put all files to USB and follow the PDF guide
ian.ameline:
I'll give that a shot later this week when I get some spare time.

janekivi:
I can't get it use "best compression" but new file is only 25Kb bigger.
I don't know what you can do with it...

SDS1004X-E_OSV1_EN_eevblog.zip
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