Bug 244422

Summary:	regression: chmod setuid/setgid doesn't do what it's told
Product:	[Fedora] Fedora	Reporter:	Zing <zing>
Component:	coreutils	Assignee:	Tim Waugh <twaugh>
Status:	CLOSED DUPLICATE	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	7	CC:	meyering, stephenbryant
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2007-06-18 06:41:12 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Zing 2007-06-15 15:39:03 UTC

Description of problem:
chmod is not removing setuid/setgid bit using OCTAL-MODE.

Version-Release number of selected component (if applicable):
coreutils-6.9-2.fc7.x86_64

How reproducible:
always

Steps to Reproduce:

1. I want to make a directory setgid:

# ls -ld .
drwxrwx--- 3 root svn 4096 2007-06-15 10:59 ./
# chmod 4770 .
# ls -ld .
drwsrwx--- 3 root svn 4096 2007-06-15 10:59 ./

2. oops, not setuid... fix that...

# chmod 2770 .
# ls -ld .
drwsrws--- 3 root svn 4096 2007-06-15 10:59 ./

3. WTF!@#$!  I said 2770!!!!! NOT 6770

4. <calm down> try to clear the bits...

# chmod 0770 .
# ls -ld .
drwsrws--- 3 root svn 4096 2007-06-15 10:59 ./

5. kill -9 self

Actual results:
something dumb

Expected results:
i expect 2770 to be 2770.  There doesn't even seem to be a way to clear the
setuid/setgid bits?

Additional Info:
What in the world is the use case for this bizarre semantics???  You've changed
how this utility has worked for a long time... Please revert/fix to get back
normalcy in this world.

Comment 1 Jim Meyering 2007-06-18 06:41:12 UTC

This is a duplicate of http://bugzilla.redhat.com/243517
Now you have to use chmod's symbolic modes (u-s, g-s, o-t) to clear a
directory's special bits.

*** This bug has been marked as a duplicate of 243517 ***

Comment 2 Steve Bryant 2007-06-18 08:14:26 UTC

N.B. both "chmod 777" and "chmod 0777" do turn off the sticky bit, but not the
set-uid and set-gid bits of directories.