linux-kernel - Question regarding chmod/chown for /proc entries

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Message-Id: <200803112352.EGH60440.OJQFSFtOMFOVHL@I-love.SAKURA.ne.jp>
Date:	Tue, 11 Mar 2008 23:52:06 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Question regarding chmod/chown for /proc entries

Hello.

In 2.4 kernels, chmod/chown requests against /proc entries
return success but the mode/uid/gid aren't changed.

In 2.6 kernels, chmod/chown requests against /proc entries
return success and the mode/uid/gid are changed.

This is because 2.4 kernels don't update
"struct proc_dir_entry"->mode/uid/gid like 2.6 kernels.
( 2.4 kernels don't have proc_notify_change() hook.)

What's the reason for this difference?

Regards.
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