Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 36 insertions, 0 deletions

diff --git a/arch/powerpc/mm/book3s32/kuap.c b/arch/powerpc/mm/book3s32/kuap.c
new file mode 100644
index 000000000..28676cabb
--- /dev/null
+++ b/arch/powerpc/mm/book3s32/kuap.c
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <asm/kup.h>
+#include <asm/smp.h>
+
+struct static_key_false disable_kuap_key;
+EXPORT_SYMBOL(disable_kuap_key);
+
+void kuap_lock_all_ool(void)
+{
+	kuap_lock_all();
+}
+EXPORT_SYMBOL(kuap_lock_all_ool);
+
+void kuap_unlock_all_ool(void)
+{
+	kuap_unlock_all();
+}
+EXPORT_SYMBOL(kuap_unlock_all_ool);
+
+void setup_kuap(bool disabled)
+{
+	if (!disabled) {
+		kuap_lock_all_ool();
+		init_mm.context.sr0 |= SR_KS;
+		current->thread.sr0 |= SR_KS;
+	}
+
+	if (smp_processor_id() != boot_cpuid)
+		return;
+
+	if (disabled)
+		static_branch_enable(&disable_kuap_key);
+	else
+		pr_info("Activating Kernel Userspace Access Protection\n");
+}