From: Peter Zijlstra <peterz@infradead.org>
Date: Thu, 14 Jul 2022 10:20:19 +0000 (+0200)
Subject: um: Add missing apply_returns()
X-Git-Tag: v5.10.133~6
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=8e2774270aa319f552fab969bc4500e412d2566b;p=users%2Fdwmw2%2Flinux.git

um: Add missing apply_returns()

commit 564d998106397394b6aad260f219b882b3347e62 upstream.

Implement apply_returns() stub for UM, just like all the other patching
routines.

Fixes: 15e67227c49a ("x86: Undo return-thunk damage")
Reported-by: Randy Dunlap <rdunlap@infradead.org)
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/Ys%2Ft45l%2FgarIrD0u@worktop.programming.kicks-ass.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
index 2676ac3221464..26af24b5d900a 100644
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -362,6 +362,10 @@ void apply_retpolines(s32 *start, s32 *end)
 {
 }
 
+void apply_returns(s32 *start, s32 *end)
+{
+}
+
 void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
 {
 }