1 files changed, 37 insertions, 0 deletions
diff --git a/debian/patches-rt/powerpc_stackprotector__work_around_stack-guard_init_from_atomic.patch b/debian/patches-rt/powerpc_stackprotector__work_around_stack-guard_init_from_atomic.patch
new file mode 100644
index 000000000..c8994ca9d
--- /dev/null
+++ b/debian/patches-rt/powerpc_stackprotector__work_around_stack-guard_init_from_atomic.patch
@@ -0,0 +1,37 @@
+Subject: powerpc/stackprotector: work around stack-guard init from atomic
+From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+Date: Tue Mar 26 18:31:29 2019 +0100
+Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.6/older/patches-6.6.7-rt18.tar.xz
+
+From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+
+This is invoked from the secondary CPU in atomic context. On x86 we use
+tsc instead. On Power we XOR it against mftb() so lets use stack address
+as the initial value.
+
+Cc: stable-rt@vger.kernel.org
+Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
+
+
+---
+ arch/powerpc/include/asm/stackprotector.h |    7 ++++++-
+ 1 file changed, 6 insertions(+), 1 deletion(-)
+---
+--- a/arch/powerpc/include/asm/stackprotector.h
++++ b/arch/powerpc/include/asm/stackprotector.h
+@@ -19,8 +19,13 @@
+  */
+ static __always_inline void boot_init_stack_canary(void)
+ {
+-	unsigned long canary = get_random_canary();
++	unsigned long canary;
+ 
++#ifndef CONFIG_PREEMPT_RT
++	canary = get_random_canary();
++#else
++	canary = ((unsigned long)&canary) & CANARY_MASK;
++#endif
+ 	current->stack_canary = canary;
+ #ifdef CONFIG_PPC64
+ 	get_paca()->canary = canary;