PW4 Some notes on PW4 issues and resolution

[knc1]

Originally Posted by trcm

Does the file system support ACLs, any immutable flag that could be applied?

Yes, but has been fixed a long time ago.

[trcm]

Some kind of ld_preload or kernel module to interpose unlink?
What a crappy situation

[dhdurgee]

Well, unless there is a solution to this before I need a replacement for one of my current units I will either be buying used or another ereader. Amazon sure knows how to discourage repeat business.

Dave

[knc1]

Originally Posted by trcm

Some kind of ld_preload or kernel module to interpose unlink?
What a crappy situation

Simpler than that ...
ELF supports alias'd symbols (which include lib-c ).
I have an example of the simple code, somewhere.
Whichever one of us finds it first, posts here and wins.

[trcm]

What if the directory was a mount point ?

[NiLuJe]

Okay, that's sneaky, I like it! .

It could potentially work with a RO loop, but I'm not sure how the system would deal with that failure (i.e., we might be back into "stupid endless retry" territory).

[trcm]

I wonder what happens if this is set to zero or one:

# kdb get system/daemon/otaup/TRANSFER_TIMEOUT_SEC
126000

[NiLuJe]

There's potentially a whole lot of fun stuff to test with the otaup elekra keys: You could play with the PATH ones, and send a few of them to /dev/null, and see what happens.

Depending on whether they use a copy or a move, that might not help (as a move won't work across FS boundaries), again, depending on how failure is handled.

The Elektra DB is mildly annoying to permanently affect, though, as it's a RO loop-mounted cramfs (or squashfs, now).
USBNet has a very very very dirty hack to do just that when custom MACs are enabled.

[trcm]

Ahh, that's very interesting, I don't know anything about the Elektra DB,
now I'm reading _very_ old things (http://www.mobileread.mobi/forums/sh...=240616&page=3) and the /usr/lib/libenvload.so I was looking at is making more sense!

[trcm]

[root@kindle root]# objdump -T /usr/lib/liblab126utils_advanced.so.1 | awk '/pass/{print$7}'
lab126_password_is_device
lab126_password_dialog_close
prv_lab126_password_generate_password_file
lab126_password_dialog
lab126_password_set_hint
lab126_password_test_restore
lab126_password_enable
prv_lab126_password_write_to_file
lab126_password_get_hint
lab126_password_is_brick
lab126_password_set
lab126_password_test_backup
lab126_password_validate
lab126_password_disable
lab126_password_is_enabled
prv_lab126_password_read_current_password

There's so much intriguing stuff in here, is there an existing wiki for this stuff?

[knc1]

Originally Posted by trcm

Ahh, that's very interesting, I don't know anything about the Elektra DB,
now I'm reading _very_ old things (http://www.mobileread.mobi/forums/sh...=240616&page=3) and the /usr/lib/libenvload.so I was looking at is making more sense!

I can not sense that I ever read that thread you linked to.
It does not even seem familiar to me after re-reading it.
I wonder what I had in mind back then.

[trcm]

Ooh.

/mnt-rootfs/PRE_GM_DEBUGGING_FEATURES_ENABLED__REMOVE_AT_GMC
Pre-GM file present. Skipping downgrade validations

[hius07]

Originally Posted by trcm

Ooh.

/mnt-rootfs/PRE_GM_DEBUGGING_FEATURES_ENABLED__REMOVE_AT_GMC
Pre-GM file present. Skipping downgrade validations

It is known
https://www.mobileread.com/forums/sh...d.php?t=288836

[trcm]

I'm sure it's all known, sorry for spamming :<

[NiLuJe]

At a guess, the password stuff from utils is for the... password feature (AKA. PIN lock) .