Security Vulnerability in the Solaris sendfile(3EXT) and sendfilev(3EXT) Extended Library Functions may Result in a Denial of Service (DoS) Condition due to a System Panic

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Security vulnerability in the Solaris sendfile(3EXT) and sendfilev(3EXT) extended library functions may result in a Denial of Service (DoS) condition due to a system panic:

1. Impact

A security vulnerability in the Solaris sendfile(3EXT) and sendfilev(3EXT) extended library functions may allow a local unprivileged user to panic the system, causing a Denial of Service (DoS).

2. Contributing Factors

This issue can occur in the following releases:

SPARC Platform

• Solaris 8 without patch 127721-02
  
• Solaris 9 without patch 122300-42
  
• Solaris 10 without patch 141414-05
  
• OpenSolaris based upon builds snv_01 through snv_109
  

x86 Platform

• Solaris 8 without patch 127722-02
• Solaris 9 without patch 122301-42
• Solaris 10 without patch 141415-05
• OpenSolaris based upon builds snv_01 through snv_109
  

Note: 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 2: Solaris 8 entered EOSL Phase 2 on 1 April 2009. Entitlement to patches developed on or after 1 April 2009 requires the purchase of the Solaris 8 Vintage Patch Service. See note in section 5 for more details.

3. Symptoms

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

    panic[cpu1]/thread=c8491660: Deadlock: cycle in blocking chain

    c9091cf4 genunix:turnstile_block()
    c9091d3c unix:rw_enter_sleep()
    c9091d5c tmpfs:tmp_rwlock()
    c9091d70 genunix:fop_rwlock()
    c9091e18 genunix:sendvec_chunk()
    c9091f7c genunix:sendfilev()

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 127721-02 or later
  
• Solaris 9 with patch 122300-42 or later
• Solaris 10 with patch 141414-05
• OpenSolaris based upon builds snv_110 or later
  

x86 Platform

• Solaris 8 with patch 127722-02 or later
• Solaris 9 with patch 122301-42 or later
• Solaris 10 with patch 141415-05 or later
• OpenSolaris based upon builds snv_110 or later

Note: The READMEs of Solaris 8 patches developed on or after 1 April 2009 are available to all customers however Solaris 8 entered EOSL Phase 2 on April 1, 2009 and thus entitlement for these patches,  including those that fix security vulnerabilities, requires the purchase of the Solaris 8 Vintage Patch Service. More information about the Solaris 8 Vintage Patch Service is available at:

• http://www.sun.com/service/eosl/Solaris8.html

For more information on Security Sun Alerts, see Technical Instruction ID 213557.

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.

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