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Permission settings with 'S' or 's' in execute position
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nwef  
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 More options Jun 6 2003, 10:23 am
Newsgroups: comp.unix.aix
From: nwef...@dbs1.com (nwef)
Date: 6 Jun 2003 07:23:13 -0700
Local: Fri, Jun 6 2003 10:23 am
Subject: Permission settings with 'S' or 's' in execute position
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Can anyone explain the occurence of an 'S' or 's' in the execute
position of the permission string? ie) "-wrxw sw x"
Thanks,
Nancy Wefler

 
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Anne Tuchscherer  
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 More options Jun 6 2003, 11:03 am
Newsgroups: comp.unix.aix
From: Anne Tuchscherer <anntuchsche...@comcast.net>
Date: Fri, 06 Jun 2003 15:15:54 GMT
Local: Fri, Jun 6 2003 11:15 am
Subject: Re: Permission settings with 'S' or 's' in execute position
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This is often referred to as the sticky bit.  It used to be used a long
time ago (in UNIX years) for keeping things in memory.  Now, if it is on
a directory it will make the group the same for any files created in
that directory (unless changed manually).   Not sure what it does on an
executable.

I do know that if the s is capitalized it means that the execute bit in
not set.  If you want to remove the s or S you can only remove it by
using chmod g-s <file or dir>.  It can be set either by chmod g+s <file
or dir> or chmod 2755 <file or dir>.

Anne Tuchscherer
Medstar Health


 
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Uli Link  
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 More options Jun 6 2003, 12:31 pm
Newsgroups: comp.unix.aix
From: "Uli Link" <Ulrich.--nO-sPAM--L...@Epost.de>
Date: Fri, 6 Jun 2003 18:29:10 +0200
Local: Fri, Jun 6 2003 12:29 pm
Subject: Re: Permission settings with 'S' or 's' in execute position
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> This is often referred to as the sticky bit.  It used to be used a long
> time ago (in UNIX years) for keeping things in memory.  Now, if it is on
> a directory it will make the group the same for any files created in
> that directory (unless changed manually).   Not sure what it does on an
> executable.

If the -s is set for the owner the binary is executed with the context of
the owner,
same for the group. Popular example is "top" which needs some kernel
privileges in is executed with s-bit for the group.

> I do know that if the s is capitalized it means that the execute bit in
> not set.  If you want to remove the s or S you can only remove it by
> using chmod g-s <file or dir>.  It can be set either by chmod g+s <file
> or dir> or chmod 2755 <file or dir>.

chmod syntax same as for dirs.

---
Uli


 
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Jurjen Oskam  
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 More options Jun 6 2003, 12:31 pm
Newsgroups: comp.unix.aix
From: Jurjen Oskam <jos...@quadpro.stupendous.org>
Date: 06 Jun 2003 16:31:58 GMT
Local: Fri, Jun 6 2003 12:31 pm
Subject: Re: Permission settings with 'S' or 's' in execute position
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In article <1e45d342b95219a8becfa4c88bcce...@free.teranews.com>, Anne Tuchscherer wrote:
> This is often referred to as the sticky bit.  It used to be used a long
> time ago (in UNIX years) for keeping things in memory.  Now, if it is on

You're describing the 't' bit here. The 't' bit is called the sticky bit.
The 's' bit is the setuid- or setgid-bit.

For the original poster: read
http://www.cs.rutgers.edu/~watrous/unix-protections.html, found after a
ten second Google-session.

> I do know that if the s is capitalized it means that the execute bit in
> not set.  If you want to remove the s or S you can only remove it by
> using chmod g-s <file or dir>.  It can be set either by chmod g+s <file
> or dir> or chmod 2755 <file or dir>.

This is correct.

--
Jurjen Oskam

PGP Key available at http://www.stupendous.org/


 
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Rog  
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 More options Jun 6 2003, 6:38 pm
Newsgroups: comp.unix.aix
From: "Rog" <NON>
Date: Fri, 6 Jun 2003 23:38:30 +0100
Local: Fri, Jun 6 2003 6:38 pm
Subject: Re: Permission settings with 'S' or 's' in execute position
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-rwxrwsrwx

GUID - whenever this file is executed, it will run with the same group id as
the owner regardless of the id of the person executing it

-rwsrwxrwx

SUID - whenever this file is executed it will run with the same user id as
the owner, regardless of the id of the person executing it

"nwef" <nwef...@dbs1.com> wrote in message

news:487bb720.0306060623.65ce7611@posting.google.com...


 
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Villy Kruse  
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 More options Jun 10 2003, 6:43 am
Newsgroups: comp.unix.aix
From: v...@station02.ohout.pharmapartners.nl (Villy Kruse)
Date: 10 Jun 2003 10:43:29 GMT
Local: Tues, Jun 10 2003 6:43 am
Subject: Re: Permission settings with 'S' or 's' in execute position
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On Fri, 6 Jun 2003 23:38:30 +0100,
    Rog <NON> wrote:

>-rwxrwsrwx

>GUID - whenever this file is executed, it will run with the same group id as
>the owner regardless of the id of the person executing it

>-rwsrwxrwx

>SUID - whenever this file is executed it will run with the same user id as
>the owner, regardless of the id of the person executing it

Close,  The EFFECTIVE user id is set to the owner of the file.  The REAL
user id remains the same as the uid of the invoking process.

Villy


 
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Arie Maat  
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 More options Jun 24 2003, 8:25 am
Newsgroups: comp.unix.aix
From: "Arie Maat" <ariem...@home.nl>
Date: Tue, 24 Jun 2003 14:25:40 +0200
Local: Tues, Jun 24 2003 8:25 am
Subject: Re: Permission settings with 'S' or 's' in execute position
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Hi,

Also an helpfull link:

http://docs.sun.com/db/doc/816-4883/6mb2joasa?a=view

Good luck,

Arie Maat

"nwef" <nwef...@dbs1.com> wrote in message

news:487bb720.0306060623.65ce7611@posting.google.com...

> Can anyone explain the occurence of an 'S' or 's' in the execute
> position of the permission string? ie) "-wrxw sw x"
> Thanks,
> Nancy Wefler

---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.491 / Virus Database: 290 - Release Date: 18-6-2003

 
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