On 22.12.2017 17:58, Robert Elz wrote: > Date: Fri, 22 Dec 2017 23:35:12 +0700 > From: Robert Elz <kre%munnari.OZ.AU@localhost> > Message-ID: <19521.1513960512%andromeda.noi.kre.to@localhost> > > | The EFAULT that is returned there is probably the one Kamil mentioned. > > And of course it is, as in the test ... > > if ((p != curproc && (p->p_sflag & PS_WEXIT) != 0) || > > (the || alternative is irrelevant, even though it is XXX'd) as > we know p != curproc (this is ptrace I/O - the process whose addr > space is being written is not the process doing the sys call > "What never? Well, hardly ever...") and nor is that process usually > exiting (too late to modify it then) - so for ptrace() that test > is more or less guaranteed true - which leads to the EFAULT. > > kre > Thank you for the investigation! I'm cleaning up now the status of the existing tests and be back to to proper fix for PT_READ/WRITE_I/D.
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