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Re: [tor-talk] USB sticks for Tails (write protection switch)



On Thu, Mar 12, 2015 at 12:35 AM, Moritz Bartl <moritz@torservers.net> wrote:
> (**) Nobody has actually proven that you can circumvent the read-only
> bit and simply write with modified kernel drivers ("please don't write
> ...
> The (micro)SD exposes registers for permanent write protection (cannot
> be undone) and temporary write protection. If you set TMP_WRITE_PROTECT
> and expose the SD card as USB device (not as mmc card), the registers
> cannot be accessed from the host, so they cannot be changed. For an
> example of this, see https://github.com/Nephiel/sdlocker-tiny . Maybe
> there's a nice little SD card USB reader with a firmware that can be
> patched for this.

I wish to look at this further, but if these are normal mmc / usb / ata / scsi
commmand opcodes (not actually requiring a physical burning interface),
than you can do this commands over camcontrol freebsd or maybe
[h|s]dparm linux without special dongle.
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