Patch "KPTI: Report when enabled" has been added to the 4.4-stable tree

Patch "KPTI: Report when enabled" has been added to the 4.4-stable tree

[gregkh]

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

    KPTI: Report when enabled

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     kpti-report-when-enabled.patch
and it can be found in the queue-4.4 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.


>From keescook@chromium.org  Wed Jan  3 20:49:35 2018
From: Kees Cook <keescook@chromium.org>
Date: Wed, 3 Jan 2018 10:43:32 -0800
Subject: KPTI: Report when enabled
To: Greg KH <gregkh@linuxfoundation.org>
Message-ID: <20180103184332.GA18888@beast>
Content-Disposition: inline

From: Kees Cook <keescook@chromium.org>

Make sure dmesg reports when KPTI is enabled.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/x86/mm/kaiser.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/arch/x86/mm/kaiser.c
+++ b/arch/x86/mm/kaiser.c
@@ -11,6 +11,9 @@
 #include <linux/uaccess.h>
 #include <linux/ftrace.h>
 
+#undef pr_fmt
+#define pr_fmt(fmt)     "Kernel/User page tables isolation: " fmt
+
 #include <asm/kaiser.h>
 #include <asm/tlbflush.h>	/* to verify its kaiser declarations */
 #include <asm/pgtable.h>
@@ -293,7 +296,7 @@ enable:
 	return;
 
 disable:
-	pr_info("Kernel/User page tables isolation: disabled\n");
+	pr_info("disabled\n");
 
 silent_disable:
 	kaiser_enabled = 0;
@@ -353,6 +356,8 @@ void __init kaiser_init(void)
 	kaiser_add_user_map_early(&debug_idt_table,
 				  sizeof(gate_desc) * NR_VECTORS,
 				  __PAGE_KERNEL);
+
+	pr_info("enabled\n");
 }
 
 /* Add a mapping to the shadow mapping, and synchronize the mappings */


Patches currently in stable-queue which might be from keescook@chromium.org are

queue-4.4/kpti-rename-to-page_table_isolation.patch
queue-4.4/kpti-report-when-enabled.patch