PROBLEM: (57336, 90066, BCGM51RKR) (PATCH ID: OSF510-460)
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This patch fixes two issues:

- If multiple processes attempted to access the same file at the same
time
and access to the file should have been allowed by an ACL on the file,
access
may have been denied instead.  Now access will be allowed as expected.

- If the ACL on a file was corrupted the corrupted data was being passed
into the kernel causing a variety of problems, including panics in
kernel malloc/free after it was called by the ACL code.  Now more of the
ACL data is being validated.  The system will respond to the corrupted
data with an "Invalid Argument" error.

    One example panic:
    trap: invalid memory write access from kernel mode
       3 _XentMM
       4 free_common
       5 free
       6 kfree
       7 sp_delete_ir
       8 acl_ir_cache_delete
       9 LOCK_DONE_SECATTR