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Bug 89145

Summary: useradd uses uninitialized memory
Product: [Retired] Red Hat Raw Hide Reporter: Enrico Scholz <rh-bugzilla>
Component: shadow-utilsAssignee: Peter Vrabec <pvrabec>
Status: CLOSED RAWHIDE QA Contact: David Lawrence <dkl>
Severity: medium Docs Contact:
Priority: medium    
Version: 1.0CC: barryn, chris.ricker, ldv, me, rdtennent, redhat-bugzilla, wtogami
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: 2005-04-11 11:27:22 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:
Bug Depends On:    
Bug Blocks: 100644    
Attachments:
Description Flags
fixes usage of uninitialized 'user_groups' variable
none
shadow-4.0.0-alt-user_groups.patch none

Description Enrico Scholz 2003-04-18 12:05:47 UTC 
This a CC of a mail to shadow.pl (I could not find an archive; the given
link is dead):

==============

Hello,

the attached patch fixes the usage of an uninitialized 'user_groups'
variable.

This variable will be initialized by the get_groups() method, which
will not be called in all cases (only when '-G' flag is given). But the
grp_update() function (which uses this variable) can be called in other
cases also (e.g. on RHL systems which are adding user-groups).

===============


Description of problem:

shadow-utils-4.0.3-6
Comment 1 Enrico Scholz 2003-04-18 12:06:19 UTC 
Created attachment 91187 [details]
fixes usage of uninitialized 'user_groups' variable
Comment 2 Warren Togami 2003-04-18 12:50:11 UTC 
http://www.fedora.us/pipermail/fedora-devel/2003-April/000972.html
The combination of glibc-2.3.2 and libsafe causes this to segfault on RH9 and
Mandrake 9.1.  We didn't discover this before because libsafe and older glibc
didn't trigger a segfault.

I have confirmed that the segfault no longer happens on RH9 with this patch to
shadow-utils.
Comment 3 Warren Togami 2003-04-18 13:24:24 UTC 
http://qa.mandrakesoft.com/show_bug.cgi?id=3781
Mandrake equivalent
Comment 4 Bob T. 2003-10-08 12:00:01 UTC 
*** Bug 106218 has been marked as a duplicate of this bug. ***
Comment 5 Warren Togami 2003-12-02 07:44:21 UTC 
Can we please apply this to rawhide?  This is still an issue in FC1.
Comment 6 Dmitry V. Levin 2004-01-09 23:00:30 UTC 
Could you look at shadow cvs from time to time, please: 
 
2003-06-30  Tomasz Kloczko  <kloczek.pl> 
 
        * src/useradd.c, src/usermod.c: 
        Added initializing memory in variables when get_groups() function is not 
called, 
        and memory allocated for user_groups is not initialized (in both useradd 
and 
        usermod when -G options is used and in usermod when -l option is used). 
        That causing segfaults sometimes. 
        This fix is importand but not critical because usermod and usermod aren't 
suid 
        root. 
        Problem reported and fixed by Alexey Voinov <voins>.
Comment 7 Warren Togami 2004-01-21 11:24:58 UTC 
I just noticed that nalin checked in the fix into CVS on January 7th
for rawhide shadow-utils-4.0.3-17.  Perhaps external contributors
should review the SRPM to be safe.
Comment 8 Dmitry V. Levin 2004-01-21 11:55:56 UTC 
usermod.c hunk is missing in the shadow-4.0.3-uninitialized.patch from 
shadow-utils-4.0.3-17.src.rpm
Comment 9 Dmitry V. Levin 2004-01-21 11:57:18 UTC 
Created attachment 97144 [details]
shadow-4.0.0-alt-user_groups.patch
Comment 10 Warren Togami 2004-01-21 11:58:31 UTC 
Arg... re-opening and bugging nalin...
Comment 11 Enrico Scholz 2004-01-21 13:09:15 UTC 
btw, shadow-utils 4.0.4.1 has been released which contains this fix
already