From de0f7349a0dd072e54b5fc04c305907b22d28a5f Mon Sep 17 00:00:00 2001
From: Nathan Lynch <nathanl@linux.ibm.com>
Date: Mon, 7 Dec 2020 15:51:33 -0600
Subject: [PATCH] powerpc/rtas: prevent suspend-related sys_rtas use on LE

References: bsc#1181674 ltc#189159
Patch-mainline: v5.11-rc1
Git-commit: de0f7349a0dd072e54b5fc04c305907b22d28a5f

While drmgr has had work in some areas to make its RTAS syscall
interactions endian-neutral, its code for performing partition
migration via the syscall has never worked on LE. While it is able to
complete ibm,suspend-me successfully, it crashes when attempting the
subsequent ibm,update-nodes call.

drmgr is the only known (or plausible) user of ibm,suspend-me,
ibm,update-nodes, and ibm,update-properties, so allow them only in
big-endian configurations.

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201207215200.1785968-2-nathanl@linux.ibm.com
Acked-by: Michal Suchanek <msuchanek@suse.de>
---
 arch/powerpc/kernel/rtas.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c
index 954f41676f69..4ed64aba37d6 100644
--- a/arch/powerpc/kernel/rtas.c
+++ b/arch/powerpc/kernel/rtas.c
@@ -1050,9 +1050,11 @@ static struct rtas_filter rtas_filters[] __ro_after_init = {
 	{ "set-time-for-power-on", -1, -1, -1, -1, -1 },
 	{ "ibm,set-system-parameter", -1, 1, -1, -1, -1 },
 	{ "set-time-of-day", -1, -1, -1, -1, -1 },
+#ifdef CONFIG_CPU_BIG_ENDIAN
 	{ "ibm,suspend-me", -1, -1, -1, -1, -1 },
 	{ "ibm,update-nodes", -1, 0, -1, -1, -1, 4096 },
 	{ "ibm,update-properties", -1, 0, -1, -1, -1, 4096 },
+#endif
 	{ "ibm,physical-attestation", -1, 0, 1, -1, -1 },
 };
 
-- 
2.26.2