Write protection on SD cards

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From	Günther Schwarz <strap@gmx.de>
Newsgroups	comp.os.linux.security
Subject	Write protection on SD cards
Date	1 Nov 2011 20:31:34 GMT
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Most SD flash cards do have a little plastic thing for write protection. 
As far as I understand this is not connected to the electronics of the 
card but rather informs the card reader which in turn sends a read-only 
flag to the host (some readers do ignore the switch). How secure is this 
with Linux as the host OS? Will it be possible to force a mount with rw 
option?
The background of my question is that I could make good use of a read-
only device other than a optical disk on some systems. USB sticks with a 
switch for write protection seem to be as rare as hen's teeth today.

Günther

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Write protection on SD cards Günther Schwarz <strap@gmx.de> - 2011-11-01 20:31 +0000
  Re: Write protection on SD cards Lusotec <nomail@nomail.not> - 2011-11-01 21:48 +0000
  Re: Write protection on SD cards Tobias Blass <tobiasblass@gmx.net> - 2011-11-02 13:10 +0000
    Re: Write protection on SD cards Günther Schwarz <strap@gmx.de> - 2011-11-05 11:51 +0000
      Re: Write protection on SD cards mcanswer@mcanswer.pl - 2011-12-17 07:51 +0100
        Re: Write protection on SD cards Günther Schwarz <strap@gmx.de> - 2011-12-17 16:32 +0000

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