Bug Id
6748772

Product
Solaris 8 Operating System
Solaris 9 Operating System
Solaris 10 Operating System
OpenSolaris

Date of Workaround Release
09-Jan-2009

Date of Resolved Release
12-Jan-2009

Security vulnerability in aio_suspend(3RT) may lead to a system panic, resulting in a Denial of Service (DoS):

1. Impact

An integer overflow security vulnerability in aio_suspend(3RT) may allow a local unprivileged user to panic systems running in 32 bit mode, thereby resulting in a Denial of Service (DoS) condition.

This issue is also mentioned in the following document:

• http://www.trapkit.de/advisories/TKADV2009-001.txt
  

Sun acknowledges with thanks, Tobias Klein (http://www.trapkit.de/) for bringing this issue to our attention.

2. Contributing Factors

This issue can occur in the following releases:

SPARC Platform

• Solaris 8 without patch 117350-59
• Solaris 9 without patch 138577-01
• Solaris 10 without patch 121394-02
  
• OpenSolaris based upon builds snv_01 through snv_106
  

x86 Platform

• Solaris 8 without patch 117351-59
• Solaris 9 without patch 138578-01
• Solaris 10 without patch 121395-02
  
• OpenSolaris based upon builds snv_01 through snv_106

Note 1: The function aio_suspend() is described in the man page section 3C in OpenSolaris builds 2008.05 and later.

Note 2: OpenSolaris distributions may include additional bug fixes above and beyond the build from which it was derived. To determine the base build of OpenSolaris, the following command can be used:

    $ uname -v
    snv_86

Note 3:  This issue only impacts systems that are running in 32 bit mode. To determine if a system is running in 32 bit mode, execute the following command:

    $ isainfo -b
    32

If "32" is returned, the system is running in 32-bit mode.

3. Symptoms

If the described issue occurs, the system may panic with a stack trace similar to the following:

    panic[cpu0]/thread=d4764de0:
    vmem_xalloc(): size == 0

    d418cd94 genunix:vmem_xalloc+2d8 (fec66738, 0, 1000, )
    d418cdd0 genunix:vmem_alloc+135 (fec66738, 0, 1)
    d418cdfc unix:segkmem_xalloc+2d (fec66738, 0, 0, 1, )
    d418ce28 unix:segkmem_alloc_vn+b7 (fec66738, 0, 1, fec)
    d418ce40 unix:segkmem_alloc+16 (fec66738, 0, 1)
    d418ce8c genunix:vmem_xalloc+3b4 (da004690, fffffffc,)
    d418cec8 genunix:vmem_alloc+135 (da004690, fffffffc,)
    d418cee4 genunix:kmem_alloc+32 (fffffffc, 1)
    d418cf30 kaio:aiosuspend+a6 (0, 3fffffff, 0, 0, )
    d418cf64 kaio:kaio+162 (d418cf8c, d418cf78)
    d418cf84 genunix:syscall_ap+4d (8, 0, 3fffffff, 0, )

4. Workaround

There is no workaround for this issue.  Please see the Resolution section below.

5. Resolution

This issue is addressed in the following releases:

SPARC Platform

• Solaris 8 with patch 117350-59 or later
• Solaris 9 with patch 138577-01 or later
• Solaris 10 with patch 121394-02 or later
• OpenSolaris based upon builds snv_107 and later
  

x86 Platform

• Solaris 8 with patch 117351-59 or later
• Solaris 9 with patch 138578-01 or later
• Solaris 10 with patch 121395-02 or later
• OpenSolaris based upon builds snv_107 and later
  

For more information on Security Sun Alerts, see 1009886.1.

This Sun Alert notification is being provided to you on an "AS IS" basis. This Sun Alert notification may contain information provided by third parties. The issues described in this Sun Alert notification may or may not impact your system(s). Sun makes no representations, warranties, or guarantees as to the information contained herein. ANY AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT YOU ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN. This Sun Alert notification contains Sun proprietary and confidential information. It is being provided to you pursuant to the provisions of your agreement to purchase services from Sun, or, if you do not have such an agreement, the Sun.com Terms of Use. This Sun Alert notification may only be used for the purposes contemplated by these agreements.

Copyright 2000-2008 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, CA 95054 U.S.A. All rights reserved.

Modification History
12-Jan-2009: Updated Contributing Factors and Resolution sections. Resolved.

References

117350-59
138577-01
117351-59
138578-01
121394-02
121395-02





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