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From: mru@kth.se (=?iso-8859-1?q?M=E5ns_Rullg=E5rd?=)
Subject: Re: Strange behavior observed w.r.t 'su' command
Date: Fri, 28 Nov 2003 11:47:20 +0100
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References: <3FC707B6.1070704@mailandnews.com> <jeoeuw7pf7.fsf@sykes.suse.de>
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Andreas Schwab <schwab@suse.de> writes:

>> hi, i am not sure if this is a kernel problem or an 'su' related issue,
>> but this is what  i have observed. Tried on 2.4.20-8 ( RH 9.0 kernel ) and
>> latest 2.6.0-test11.
>>
>> - log in as any normal user. ( on Console.).
>> - su - root
>> - from root prompt, run 'ps' and check the pid of 'su'.
>> - kill -9 <pid of su>
>> After the kill command, strangely my keyboard switches to unbuffered mode
>> ( a key press is processed immediately ). Also, i alternate between the
>> root prompt and the normal user prompt.
>> Every key press switches from root prompt to normal user prompt and vice
>> versa. Typing 'whoami' at the respective prompts displays 'normal user'
>> and 'root' for the respective prompts.
>
> Nothing unusual, you just have two shells competing with each other on the
> terminal.  Don't use kill -9 unless you know what you are doing.

It appears that my su exec()s the shell, whereas the redhat and gentoo
su fork() and exec().

-- 
M?ns Rullg?rd
mru@kth.se

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