Re: [Help] How to Replace File Operations in File System?

Rishi Agrawal <rishi.b.agrawal@xxxxxxxxx> · Thu, 20 Feb 2014 13:01:51 +0530

Hi,

I went through your readme. Some questions.

On Thu, Feb 20, 2014 at 7:02 AM, freeman <freeman.zhang1992@xxxxxxxxx> wrote:

    Hi Rishi,

    With pleasure! 

    You can check it on

    https://github.com/freemandealer/droidcry

    on your convenience.

     2014-02-19 23:17, Rishi Agrawal :

      Good that you solved it your self, still if you can
        send me the idea on which you are working - I may also learn
        something.

        On Tue, Feb 18, 2014 at 10:04 AM,
          freeman <freeman.zhang1992@xxxxxxxxx>
          wrote:

            > Hi

            >

              > The operations will not change back until your object
              gets destroyed,

              > whatever be the type of the object.

              >

              > Caching will not cause any issue here.

              >

              > Maybe if you can send the code we can have a look at
              it.

              >

              >

              > --

              > Regards,

              > Rishi Agrawal

            Hi Rishi,

            It's very nice of you willing to help check my code!

            I'm now very excited － problem solved!

            I spent half a day beautifying my code yesterday (so that it
            won't annoy

            you

            that much), and find there is a problem:

            Every time there is a read/write system call, I saved the
            lower file ops

            and

            address space ops. In their replacement(upper operations), I
            invoked

            lower ones.

            There's a possibility that it might saved the upper
            operations as lower

            ones if I

            open them twice in a short time. At this point, upper
            operation invoke

            itself!

            So I check the operations before truly save and replace them
            and, it works!

            Thanks to you and all the amazing people in this amazing
            list that

            helped me,

            now I get both wrapfs and my own non-filesystem module
            functional for my

            future work on transparent encryption, and most importantly,
            I've

            learned and

            enjoyed a lot!

            Regards

            Freeman Zhang

        -- 

        Regards,

        Rishi Agrawal

    Regards

    Freeman Zhang

1. How are you encrypting the files? Is it done by the encryptfs or you are doing it in your module.

2. How can the user selectively encrypt the files in the system.

-- 
Regards,
Rishi Agrawal

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