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Thread: I discovered an attack on a linux laptop. ACPI attack. 0% battery and not recharging

  1. #1
    Join Date
    Dec 2013
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    73

    I discovered an attack on a linux laptop. ACPI attack. 0% battery and not recharging

    A person would remote into the laptop somehow and mess with ACPI settings to mess with your battery functions. It also messes with operating installations by affecting a memory source in CMOS.

    In the kernel (I think v3 and above), ACPI actually using a space in CMOS and this can get disrupted. My battery would not charge at all and it would be at 0%.

    I took a peek at acpi_cmos_rtc.c under the kernel source /drivers/acpi and on line 52 on v 3.13.7

    Code:
    CMOS_WRITE(*value, address);
    It writes to CMOS for ACPI which I thought was odd. My windows OS does not have that problem. I had to wipe CMOS and reload the linux OS to recover it.
    I am just a captian of the sea of data in my own mind.
    -~codenine75a~-

  2. #2
    Join Date
    Dec 2010
    Location
    Fukuoka, Japan
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    1,062
    Distro
    Kubuntu 14.04 Trusty Tahr

    Re: I discovered an attack on a linux laptop. ACPI attack. 0% battery and not rechar

    How would they "remote into a laptop"?

  3. #3
    Join Date
    Dec 2013
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    73

    Re: I discovered an attack on a linux laptop. ACPI attack. 0% battery and not rechar

    Quote Originally Posted by whatthefunk View Post
    How would they "remote into a laptop"?
    I think I solved the problem.
    I did the old classic partition technique.
    I make different partitions for
    /proc
    /sys
    /root
    /sys
    /var
    etc

    No concern it was a troll bout on the public wifi brother.

    I think all live linux set ups have the same problem which is installing everything on one partition. It is a big beginner security set up because a troll can walk all over your computer data.
    Last edited by codenine75a; March 27th, 2014 at 02:08 AM. Reason: addition
    I am just a captian of the sea of data in my own mind.
    -~codenine75a~-

  4. #4
    Join Date
    Feb 2007
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    West Hills CA
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    8,035
    Distro
    Ubuntu 12.10 Quantal Quetzal

    Re: I discovered an attack on a linux laptop. ACPI attack. 0% battery and not rechar

    I have not looked at the source code for acpi_cmos_rtc.c but I would guess that the kernel needs to write to the CMOS to save the ntp-corrected time to the real time clock (rtc) so that you will have a reasonably current time when you reboot. This is neither odd, nor a security risk.

    It's quite possible that a cosmic ray blew through your CMOS and scrambled it, causing your symptoms. Or, more likely, your battery has developed a fault.
    -------------------------------------
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    Unumquodque potest reparantur. Patientia sit virtus.

  5. #5
    Join Date
    Dec 2013
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    73

    Re: I discovered an attack on a linux laptop. ACPI attack. 0% battery and not rechar

    A quick fix ubuntu does not tell the users to secure their root because root as a default password

    sudo passwd

    and I am smashing the space aliens with heavy rocks.
    I am just a captian of the sea of data in my own mind.
    -~codenine75a~-

  6. #6
    Join Date
    Mar 2006
    Location
    Williams Lake
    Beans
    Hidden!
    Distro
    Ubuntu Development Release

    Re: I discovered an attack on a linux laptop. ACPI attack. 0% battery and not rechar

    Closed due to bad information.

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