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sparc64: Make corrupted user stacks more debuggable.

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Right now if we get a corrupted user stack frame we do a
do_exit(SIGILL) which is not helpful.

If under a debugger, this behavior causes the inferior process to
exit.  So the register and other state cannot be examined at the time
of the event.

Instead, conditionally log a rate limited kernel log message and then
force a SIGSEGV.

With bits and ideas borrowed (as usual) from powerpc.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Miller
2018-10-25 20:36:46 -07:00
committed by David S. Miller
parent caf539cd10
commit 5b4fc3882a
5 changed files with 37 additions and 10 deletions
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1
arch/sparc/kernel/rtrap_64.S
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@@ -39,6 +39,7 @@ __handle_preemption:
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
__handle_user_windows:
add %sp, PTREGS_OFF, %o0
call fault_in_user_windows
661: wrpr %g0, RTRAP_PSTATE, %pstate
/* If userspace is using ADI, it could potentially pass