[Xen-devel] [PATCH] xen: Disable stack protector for irq helper

[Bastian Blank <bastian@xxxxxxxxxxxx>]

The stack protector needs additional registers on x86_32, which are not
saved in calls to the small paravirt interrupt handlers. This leads to
early crashes as registers are overwritten and not saved by the caller
as instructed.

Signed-off-by: Bastian Blank <waldi@xxxxxxxxxx>

diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
index 3bb4fc2..ac19398 100644
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile
@@ -5,9 +5,9 @@
 CFLAGS_REMOVE_irq.o = -pg
 endif
 
-# Make sure early boot has no stackprotector
 nostackp := $(call cc-option, -fno-stack-protector)
 CFLAGS_enlighten.o             := $(nostackp)
+CFLAGS_irq.o                   := $(nostackp)
 CFLAGS_mmu.o                   := $(nostackp)
 
 obj-y          := enlighten.o setup.o multicalls.o mmu.o irq.o \
-- 
Mind your own business, Spock.  I'm sick of your halfbreed interference.

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