Re: [GIT] Sparc

[David Miller]

From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Date: Thu, 23 Sep 2010 00:12:19 +0100

> OK... sparc32 question: just what the !@#!@# happens if sun4c_rett_stackchk
> find (%fp & 7) != 0?  We go to ret_trap_user_stack_is_bolixed, which
> tries to page in the underlying page.  OK, suppose it's already there and
> readable; we return without doing anything - and go to signal_p.  Which finds
> itself with nothing to do, and %fp is *still* buggered.  Spin ad infinitum?
> srmmu_rett_stackchk will do the same, BTW...

That's a bug.

Likely all of the window_*_fault() routines should force a SIGILL when
the stack is mis-aligned.
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