Security Vulnerability in aio_suspend(3RT) May Lead to a System Panic, Resulting in a Denial of Service (DoS)

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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 Technical Instruction ID 213557.

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Modification History

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

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