Bug Id
6398097, 6542909

Product
Solaris 10 Operating System

Date of Resolved Release
14-Feb-2008

Two Security Vulnerabilities Exist Within the cpc(3CPC) Sub-System of the Solaris Kernel

1. Impact

Two security vulnerabilities, both due to separate race conditions within the CPU Performance Counters (cpc(3CPC)) sub-system of the Solaris kernel, may allow a local unprivileged user to panic the system causing a Denial of Service (DoS) condition.

2. Contributing Factors

These issues can occur in the following releases:

SPARC Platform:

• Solaris 10 without patch 127111-08

x86 Platform:

• Solaris 10 without patch 127112-08

Note: These issues do not affect the Solaris 8 and Solaris 9 Operating Systems.

3. Symptoms

If the described issues occur, the system may panic with strings similar to one of the following:

For BugID 6398097: Panic in kcpc_unbind():

1. First, execute the following command:

    # echo "::status !grep panic" |mdb unix.0 vmcore.0

the output should show a BAD TRAP panic message similar to the following:

    BAD TRAP: type=34 rp=2a100f9d7c0
    addr=baddcafebaddcb06 mmu_fsr=0

2. Then execute the following command:

    # echo "*panic_thread::findstack !grep kcpc_unbind"|mdb unix.0 vmcore.0

the output should show the kcpc_unbind function displayed, as in the following example:

    000002a100f9d061 kcpc_unbind+0x28()

For BugID 6542909:  race condition between kcpc_restore() and kcpc_unbind():

1. First, execute the following command:

    # echo "::status !grep panic" |mdb unix.0 vmcore.0

the output should have a pcbe reference, as in the following example:

panic message: us_pcbe: bad config on token 327c55dcf38

2. Then execute the following command:

    # echo "*panic_thread::findstack !grep restorectx" |mdb unix.0 vmcore.0

the output should show the restorectx function displayed, as in the following example:

    000002a101b4d001 restorectx+0x24()

Note: by default, crashdumps are written to /var/crash/<uname -n>. See dumpadm(1M) for more information.

4. Workaround

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

5. Resolution

These issues are addressed in the following releases:

SPARC Platform:

• Solaris 10 with patch 127111-08 or later

x86 Platform:

• Solaris 10 with patch 127112-08 or later

For more information on Security Sun Alerts, see Sun Infodoc 91209.

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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References

127111-08
127112-08





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