strace receiving SIGSTOP on mips platform

[Luis Dallos]

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Hi.

This is not a strace only issue, gdb is affected too. This issue
(debugger/tracer receiving SIGSTOP) is specific of the latest
2.6.32 linux kernel series release (2.6.32.61), when commit
16365e5badcb314f350c47d4a9be90ed8a61b71a [1] was introduced
to fix CVE-2013-0871 [2].

Commit 55436c91652b45be576b91ec96a8d65f6b7447fa [3] fixes this
debug/trace issue on mips architecture. Note that this commit
was applied only on kernels >= 2.6.34.

Kind regards.

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Notes:

[1]: wake_up_process() should be never used to wakeup a
TASK_STOPPED/TRACED task

[2]: Race condition in the ptrace functionality in the Linux kernel
before 3.7.5 allows local users to gain privileges via a PTRACE_SETREGS
ptrace system call in a crafted application, as demonstrated by
ptrace_death.

[3]: mips: use generic ptrace_resume code
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