From: Glynn Clements <glynn@gclements.plus.com>
To: vintya@excite.com
Cc: jtwilliams@vt.edu, linux-c-programming@vger.kernel.org
Subject: Re: Problem in accessing executable files
Date: Mon, 7 Feb 2005 18:31:24 +0000 [thread overview]
Message-ID: <16903.46076.277968.721463@gargle.gargle.HOWL> (raw)
In-Reply-To: <20050206224101.B1F71B6CB@xprdmailfe15.nwk.excite.com>
Vineet Joglekar wrote:
> Thanks for suggesting the single / few bytes encryption test. I tried
> doing that, but in vain. Maybe I am going wrong somewhere else.
I'm pretty sure that mmap'ed access doesn't go through
do_generic_file_read().
Executable files (programs and shared libraries) are normally mmap'ed
rather than read, which would explain why you have problems with
executable files.
Try writing a test program which reads the contents of a file using
mmap() rather than read(). If my assumption is correct, the decryption
code will be bypassed, so you will get the encrypted data.
--
Glynn Clements <glynn@gclements.plus.com>
next prev parent reply other threads:[~2005-02-07 18:31 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-06 22:41 Problem in accessing executable files Vineet Joglekar
2005-02-07 18:31 ` Glynn Clements [this message]
-- strict thread matches above, loose matches on Subject: below --
2005-02-09 0:14 Vineet Joglekar
2005-02-09 0:21 ` Al Viro
2005-02-08 2:33 Vineet Joglekar
2005-02-01 13:58 Vineet Joglekar
2005-02-01 15:37 ` John T. Williams
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