x86/mm/pti: Map ESPFIX into user space

Map the ESPFIX pages into user space when PTI is enabled.

Signed-off-by: Andy Lutomirski <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Brian Gerst <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: David Laight <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: Juergen Gross <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>

1 files changed, 11 insertions, 0 deletions

diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c
index 0e78797650a7..b1c38ef9fbbb 100644
--- a/arch/x86/mm/pti.c
+++ b/arch/x86/mm/pti.c
@@ -288,6 +288,16 @@ static void __init pti_clone_user_shared(void)
 }
 
 /*
+ * Clone the ESPFIX P4D into the user space visinble page table
+ */
+static void __init pti_setup_espfix64(void)
+{
+#ifdef CONFIG_X86_ESPFIX64
+	pti_clone_p4d(ESPFIX_BASE_ADDR);
+#endif
+}
+
+/*
  * Clone the populated PMDs of the entry and irqentry text and force it RO.
  */
 static void __init pti_clone_entry_text(void)
@@ -308,4 +318,5 @@ void __init pti_init(void)
 
 	pti_clone_user_shared();
 	pti_clone_entry_text();
+	pti_setup_espfix64();
 }