linux-kernel - [PATCH 4.4 37/37] KPTI: Report when enabled

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Message-Id: <20180103195058.751031087@linuxfoundation.org>
Date:   Wed,  3 Jan 2018 21:11:43 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Kees Cook <keescook@...omium.org>
Subject: [PATCH 4.4 37/37] KPTI: Report when enabled

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

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

From: Kees Cook <keescook@...omium.org>

Make sure dmesg reports when KPTI is enabled.

Signed-off-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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 */