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Re: bin/56471: ntpd dies at startup on macppc/current, sshd randomly dies
> On Oct 30, 2021, at 5:42 AM, Jason Thorpe <thorpej%me.com@localhost> wrote:
> * Make sure SRR1 hasn't been maliciously tampered with.
> if (!PSL_USEROK_P(sc.sc_frame.srr1))
> return (EINVAL);
> I’m pretty sure this is what is tripping in the failure case.
It’s worth noting that the siginfo case, which was always being used until very recently, simply does this:
* Accept all user-settable bits without complaint;
* userland should not need to know the machine-specific
* MSR value.
tf->tf_srr1 = (gr[_REG_MSR] & PSL_USERMOD) | PSL_USERSET;
I.e. does no checking, and simply forces it to what it should be (modulo accepting the user-settable bits, which in the OEA case are basically FP modes and single-stepping).
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