[PATCH 4.4 172/193] x86/spectre: Check CONFIG_RETPOLINE in command line parser

From: Greg Kroah-Hartman
Date: Fri Feb 23 2018 - 15:15:34 EST


4.4-stable review patch. If anyone has any objections, please let me know.

------------------

From: Dou Liyang <douly.fnst@xxxxxxxxxxxxxx>

(cherry picked from commit 9471eee9186a46893726e22ebb54cade3f9bc043)

The spectre_v2 option 'auto' does not check whether CONFIG_RETPOLINE is
enabled. As a consequence it fails to emit the appropriate warning and sets
feature flags which have no effect at all.

Add the missing IS_ENABLED() check.

Fixes: da285121560e ("x86/spectre: Add boot time option to select Spectre v2 mitigation")
Signed-off-by: Dou Liyang <douly.fnst@xxxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: ak@xxxxxxxxxxxxxxx
Cc: peterz@xxxxxxxxxxxxx
Cc: Tomohiro <misono.tomohiro@xxxxxxxxxxxxxx>
Cc: dave.hansen@xxxxxxxxx
Cc: bp@xxxxxxxxx
Cc: arjan@xxxxxxxxxxxxxxx
Cc: dwmw@xxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lkml.kernel.org/r/f5892721-7528-3647-08fb-f8d10e65ad87@xxxxxxxxxxxxxx
Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
[jwang: cherry-pick to 4.4]
Signed-off-by: Jack Wang <jinpu.wang@xxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/cpu/bugs.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -213,10 +213,10 @@ static void __init spectre_v2_select_mit
return;

case SPECTRE_V2_CMD_FORCE:
- /* FALLTRHU */
case SPECTRE_V2_CMD_AUTO:
- goto retpoline_auto;
-
+ if (IS_ENABLED(CONFIG_RETPOLINE))
+ goto retpoline_auto;
+ break;
case SPECTRE_V2_CMD_RETPOLINE_AMD:
if (IS_ENABLED(CONFIG_RETPOLINE))
goto retpoline_amd;