Messages in this thread | | | Date | Tue, 9 Feb 2010 12:27:00 +0100 | From | Oleg Nesterov <> | Subject | Re: Race in ptrace. |
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Salman Qazi wrote: > > A race in ptrace was pointed to us by a fellow Google engineer, Tavis > Ormandy. The race involves interaction between a tracer, a tracee and > an antagonist. The tracer is tracing the tracee with PTRACE_SYSCALL and > waits on the tracee. In the mean time, an antagonist blasts the tracee > with SIGCONTs.
Could you please explain how did observe this race? Do you have a test-case, or could you explain how we can reproduce it?
Because,
> It turns out that a SIGCONT wakes up the > tracee in kernel mode,
SIGCONT must not wake up a TASK_TRACED task.
Yes, there are some know problems with SIGCONT && ptrace, but I don't see anthing related to the described problem.
Thanks,
Oleg.
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