Re: Write protect access on USB port

[berenger.morel@neutralite.org]

You can enable read-only on partitions by using the "ro" flag in fstab.

By example:
# <file system> <mount point>   <type>  <options>       <dump>  <pass>

proc	/proc	proc	defaults	0	0
#Entry for /dev/sda6 :
UUID=85bb1632-546f-460f-8cc7-5b15fd2c046b	/	ext4	noatime,errors=remount-ro	0	1

Here, / will be mounted with read-only if there were errors. I guess 
that if you just remove the "errors=" it will be ro everytime.
Hope it helps.

Le 26.11.2012 21:03, Amit a écrit :
> Hello,
>
> I would like to block write access by default to all drives plugged 
> in
> to my USB port (a specific USB port). This capability would probably 
> be
> at the kernel level to be effective.
>
> Doing research on LWN.net, I noticed the following sentence by 
> Corbet:
>
> (http://lwn.net/Articles/428533/):
>
> Enforcing read-only: The block layer has a mechanism by which a 
> driver
> can mark a specific device (or partition) as being read-only. This 
> flag
> may be set if the physical device is write-locked; it can also be set 
> by
> higher-level code (the DM or MD layers, for example) when the
> administrator creates a read-only device.
>
> Any idea on how this is done?
>
> Thanks,
> Amit