linux-kernel - Re: How to access a regular file from within a module ?

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Message-ID: <113881.9018.qm@web34408.mail.mud.yahoo.com>
Date:	Mon, 12 Jan 2009 07:51:13 -0800 (PST)
From:	Jose Luis Marchetti <joseluismarchetti@...oo.com.br>
To:	Robert Hancock <hancockr@...w.ca>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: How to access a regular file from within a module ?


> One big problem with file access in the kernel is that all
> the file operations require a process context - they need a
> process to stick the file descriptor into, to determine
> access permissions, etc. If you just start calling file
> operations from inside the kernel you're essentially
> stealing whatever process you're being called from's
> context for these operations, which is unlikely to be a good
> idea.
> 
> Not to mention, that accessing files from inside the kernel
> usually means the kernel enforces a policy on file
> naming/locations, and putting that sort of policy in the
> kernel is usually frowned upon.
OK, that is clear now.
>From all I read, it is possible to access files from within inside the kernel, but it would not be a good practice, thanks for the insights.
> 
> In the case you're describing I'm not sure why you
> couldn't just store the keys in encrypted form inside
> the user app and have it write them back out when they
> change, instead of making the kernel do it..
Yes, that was one of the possible solutions I pointed out, and it might be the one I am going to use, thanks!



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