The Linux kernel 2.6.20 and 2.6.21 does not properly handle an invalid
LDT segment selector in %cs (the xcs field) during ptrace single-step
operations, which allows local users to cause a denial of service
(NULL dereference and OOPS) via certain code that makes ptrace
PTRACE_SETREGS and PTRACE_SINGLESTEP requests, related to the
TRACE_IRQS_ON function, and possibly related to the arch_ptrace
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