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[v4,10/16] x86/die: Don't try to recover from an OOPS on a non-default stack

Message ID 66fc0e6c5a47a0bb8e96c340908067c72a027acc.1466741835.git.luto@kernel.org (mailing list archive)
State New, archived
Headers show

Commit Message

Andy Lutomirski June 24, 2016, 4:23 a.m. UTC
It's not going to work, because the scheduler will explode if we try
to schedule when running on an IST stack or similar.

This will matter when we let kernel stack overflows (which are #DF)
call die().

Signed-off-by: Andy Lutomirski <luto@kernel.org>
 arch/x86/kernel/dumpstack.c | 3 +++
 1 file changed, 3 insertions(+)
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diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index d6209f3a69cb..70d5aae8b8f7 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -245,6 +245,9 @@  void oops_end(unsigned long flags, struct pt_regs *regs, int signr)
 	if (in_interrupt())
 		panic("Fatal exception in interrupt");
+	if (((current_stack_pointer() ^ (current_top_of_stack() - 1))
+	     & ~(THREAD_SIZE - 1)) != 0)
+		panic("Fatal exception on special stack");
 	if (panic_on_oops)
 		panic("Fatal exception");