This is a note to let you know that I've just added the patch titled

x86/spectre: Check CONFIG_RETPOLINE in command line parser

to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: x86spectre_Check_CONFIG_RETPOLINE_in_command_line_parser.patch and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

Subject: x86/spectre: Check CONFIG_RETPOLINE in command line parser From: Dou Liyang douly.fnst@cn.fujitsu.com Date: Tue Jan 30 14:13:50 2018 +0800

From: Dou Liyang douly.fnst@cn.fujitsu.com

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@cn.fujitsu.com Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: ak@linux.intel.com Cc: peterz@infradead.org Cc: Tomohiro" misono.tomohiro@jp.fujitsu.com Cc: dave.hansen@intel.com Cc: bp@alien8.de Cc: arjan@linux.intel.com Cc: dwmw@amazon.co.uk Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/f5892721-7528-3647-08fb-f8d10e65ad87@cn.fujitsu.co... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- 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;

Patches currently in stable-queue which might be from douly.fnst@cn.fujitsu.com are

queue-4.14/x86spectre_Check_CONFIG_RETPOLINE_in_command_line_parser.patch