KPTI: Rename to PAGE_TABLE_ISOLATION

BugLink: http://bugs.launchpad.net/bugs/1745071

This renames CONFIG_KAISER to CONFIG_PAGE_TABLE_ISOLATION.
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

arch/x86/boot/compressed/misc.h

@@ -9,7 +9,7 @@
  */
 #undef CONFIG_PARAVIRT
 #undef CONFIG_PARAVIRT_SPINLOCKS
-#undef CONFIG_KAISER
+#undef CONFIG_PAGE_TABLE_ISOLATION
 #undef CONFIG_KASAN
 
 #include <linux/linkage.h>

arch/x86/entry/entry_64.S

@@ -1067,7 +1067,7 @@ ENTRY(paranoid_entry)
 	SWAPGS
 	xorl	%ebx, %ebx
 1:
-#ifdef CONFIG_KAISER
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
 	/*
 	 * We might have come in between a swapgs and a SWITCH_KERNEL_CR3
 	 * on entry, or between a SWITCH_USER_CR3 and a swapgs on exit.
@@ -1109,7 +1109,7 @@ ENTRY(paranoid_exit)
 	DISABLE_INTERRUPTS(CLBR_NONE)
 	TRACE_IRQS_OFF_DEBUG
 	TRACE_IRQS_IRETQ_DEBUG
-#ifdef CONFIG_KAISER
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
 	/* No ALTERNATIVE for X86_FEATURE_KAISER: paranoid_entry sets %ebx */
 	testl	$2, %ebx			/* SWITCH_USER_CR3 needed? */
 	jz	paranoid_exit_no_switch
@@ -1344,7 +1344,7 @@ ENTRY(nmi)
 
 	movq	%rsp, %rdi
 	movq	$-1, %rsi
-#ifdef CONFIG_KAISER
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
 	/* Unconditionally use kernel CR3 for do_nmi() */
 	/* %rax is saved above, so OK to clobber here */
 	ALTERNATIVE "jmp 2f", "movq %cr3, %rax", X86_FEATURE_KAISER
@@ -1359,7 +1359,7 @@ ENTRY(nmi)
 	ENABLE_IBRS
 	call	do_nmi
 
-#ifdef CONFIG_KAISER
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
 	/*
 	 * Unconditionally restore CR3.  I know we return to
 	 * kernel code that needs user CR3, but do we ever return
@@ -1589,7 +1589,7 @@ end_repeat_nmi:
 1:
 	movq	%rsp, %rdi
 	movq	$-1, %rsi
-#ifdef CONFIG_KAISER
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
 	/* Unconditionally use kernel CR3 for do_nmi() */
 	/* %rax is saved above, so OK to clobber here */
 	ALTERNATIVE "jmp 2f", "movq %cr3, %rax", X86_FEATURE_KAISER
@@ -1605,7 +1605,7 @@ end_repeat_nmi:
 	/* paranoidentry do_nmi, 0; without TRACE_IRQS_OFF */
 	call	do_nmi
 
-#ifdef CONFIG_KAISER
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
 	/*
 	 * Unconditionally restore CR3.  We might be returning to
 	 * kernel code that needs user CR3, like just just before

arch/x86/events/intel/ds.c

@@ -274,7 +274,7 @@ static DEFINE_PER_CPU(void *, insn_buffer);
 
 static void *dsalloc(size_t size, gfp_t flags, int node)
 {
-#ifdef CONFIG_KAISER
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
 	unsigned int order = get_order(size);
 	struct page *page;
 	unsigned long addr;
@@ -295,7 +295,7 @@ static void *dsalloc(size_t size, gfp_t flags, int node)
 
 static void dsfree(const void *buffer, size_t size)
 {
-#ifdef CONFIG_KAISER
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
 	if (!buffer)
 		return;
 	kaiser_remove_mapping((unsigned long)buffer, size);

arch/x86/include/asm/cpufeatures.h

@@ -199,7 +199,7 @@
 #define X86_FEATURE_RETPOLINE	( 7*32+29) /* Generic Retpoline mitigation for Spectre variant 2 */
 #define X86_FEATURE_RETPOLINE_AMD ( 7*32+30) /* AMD Retpoline mitigation for Spectre variant 2 */
 /* Because the ALTERNATIVE scheme is for members of the X86_FEATURE club... */
-#define X86_FEATURE_KAISER     ( 7*32+31) /* CONFIG_KAISER w/o nokaiser */
+#define X86_FEATURE_KAISER     ( 7*32+31) /* CONFIG_PAGE_TABLE_ISOLATION w/o nokaiser */
 
 /* Virtualization flags: Linux defined, word 8 */
 #define X86_FEATURE_TPR_SHADOW  ( 8*32+ 0) /* Intel TPR Shadow */

arch/x86/include/asm/kaiser.h

@@ -20,7 +20,7 @@
 #define KAISER_SHADOW_PGD_OFFSET 0x1000
 
 #ifdef __ASSEMBLY__
-#ifdef CONFIG_KAISER
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
 
 .macro _SWITCH_TO_KERNEL_CR3 reg
 movq %cr3, \reg
@@ -69,7 +69,7 @@ movq PER_CPU_VAR(unsafe_stack_register_backup), %rax
 8:
 .endm
 
-#else /* CONFIG_KAISER */
+#else /* CONFIG_PAGE_TABLE_ISOLATION */
 
 .macro SWITCH_KERNEL_CR3
 .endm
@@ -78,11 +78,11 @@ movq PER_CPU_VAR(unsafe_stack_register_backup), %rax
 .macro SWITCH_KERNEL_CR3_NO_STACK
 .endm
 
-#endif /* CONFIG_KAISER */
+#endif /* CONFIG_PAGE_TABLE_ISOLATION */
 
 #else /* __ASSEMBLY__ */
 
-#ifdef CONFIG_KAISER
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
 /*
  * Upon kernel/user mode switch, it may happen that the address
  * space has to be switched before the registers have been
@@ -100,10 +100,10 @@ extern void __init kaiser_check_boottime_disable(void);
 #else
 #define kaiser_enabled	0
 static inline void __init kaiser_check_boottime_disable(void) {}
-#endif /* CONFIG_KAISER */
+#endif /* CONFIG_PAGE_TABLE_ISOLATION */
 
 /*
- * Kaiser function prototypes are needed even when CONFIG_KAISER is not set,
+ * Kaiser function prototypes are needed even when CONFIG_PAGE_TABLE_ISOLATION is not set,
  * so as to build with tests on kaiser_enabled instead of #ifdefs.
  */
 

arch/x86/include/asm/pgtable.h

@@ -18,7 +18,7 @@
 #ifndef __ASSEMBLY__
 #include <asm/x86_init.h>
 
-#ifdef CONFIG_KAISER
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
 extern int kaiser_enabled;
 #else
 #define kaiser_enabled 0
@@ -872,7 +872,7 @@ static inline void pmdp_set_wrprotect(struct mm_struct *mm,
 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
 {
 	memcpy(dst, src, count * sizeof(pgd_t));
-#ifdef CONFIG_KAISER
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
 	if (kaiser_enabled) {
 		/* Clone the shadow pgd part as well */
 		memcpy(native_get_shadow_pgd(dst),

arch/x86/include/asm/pgtable_64.h

@@ -106,7 +106,7 @@ static inline void native_pud_clear(pud_t *pud)
 	native_set_pud(pud, native_make_pud(0));
 }
 
-#ifdef CONFIG_KAISER
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
 extern pgd_t kaiser_set_shadow_pgd(pgd_t *pgdp, pgd_t pgd);
 
 static inline pgd_t *native_get_shadow_pgd(pgd_t *pgdp)
@@ -127,7 +127,7 @@ static inline pgd_t *native_get_shadow_pgd(pgd_t *pgdp)
 	BUILD_BUG_ON(1);
 	return NULL;
 }
-#endif /* CONFIG_KAISER */
+#endif /* CONFIG_PAGE_TABLE_ISOLATION */
 
 static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
 {

arch/x86/include/asm/pgtable_types.h

@@ -109,7 +109,7 @@
 #define X86_CR3_PCID_MASK       (X86_CR3_PCID_NOFLUSH | X86_CR3_PCID_ASID_MASK)
 #define X86_CR3_PCID_ASID_KERN  (_AC(0x0,UL))
 
-#if defined(CONFIG_KAISER) && defined(CONFIG_X86_64)
+#if defined(CONFIG_PAGE_TABLE_ISOLATION) && defined(CONFIG_X86_64)
 /* Let X86_CR3_PCID_ASID_USER be usable for the X86_CR3_PCID_NOFLUSH bit */
 #define X86_CR3_PCID_ASID_USER	(_AC(0x80,UL))
 

arch/x86/include/asm/tlbflush.h

@@ -136,7 +136,7 @@ static inline void cr4_set_bits_and_update_boot(unsigned long mask)
  * Declare a couple of kaiser interfaces here for convenience,
  * to avoid the need for asm/kaiser.h in unexpected places.
  */
-#ifdef CONFIG_KAISER
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
 extern int kaiser_enabled;
 extern void kaiser_setup_pcid(void);
 extern void kaiser_flush_tlb_on_return_to_user(void);

arch/x86/kernel/head_64.S

@@ -441,7 +441,7 @@ early_idt_ripmsg:
 	.balign	PAGE_SIZE; \
 GLOBAL(name)
 
-#ifdef CONFIG_KAISER
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
 /*
  * Each PGD needs to be 8k long and 8k aligned.  We do not
  * ever go out to userspace with these, so we do not

arch/x86/mm/Makefile

@@ -32,4 +32,4 @@ obj-$(CONFIG_ACPI_NUMA)		+= srat.o
 obj-$(CONFIG_NUMA_EMU)		+= numa_emulation.o
 
 obj-$(CONFIG_X86_INTEL_MPX)	+= mpx.o
-obj-$(CONFIG_KAISER)		+= kaiser.o
+obj-$(CONFIG_PAGE_TABLE_ISOLATION)		+= kaiser.o

include/linux/kaiser.h

 #ifndef _LINUX_KAISER_H
 #define _LINUX_KAISER_H
 
-#ifdef CONFIG_KAISER
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
 #include <asm/kaiser.h>
 
 static inline int kaiser_map_thread_stack(void *stack)
@@ -24,7 +24,7 @@ static inline void kaiser_unmap_thread_stack(void *stack)
 #else
 
 /*
- * These stubs are used whenever CONFIG_KAISER is off, which
+ * These stubs are used whenever CONFIG_PAGE_TABLE_ISOLATION is off, which
  * includes architectures that support KAISER, but have it disabled.
  */
 
@@ -48,5 +48,5 @@ static inline void kaiser_unmap_thread_stack(void *stack)
 {
 }
 
-#endif /* !CONFIG_KAISER */
+#endif /* !CONFIG_PAGE_TABLE_ISOLATION */
 #endif /* _LINUX_KAISER_H */

include/linux/percpu-defs.h

@@ -35,7 +35,7 @@
 
 #endif
 
-#ifdef CONFIG_KAISER
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
 #define USER_MAPPED_SECTION "..user_mapped"
 #else
 #define USER_MAPPED_SECTION ""

security/Kconfig

@@ -31,7 +31,7 @@ config SECURITY
 
 	  If you are unsure how to answer this question, answer N.
 
-config KAISER
+config PAGE_TABLE_ISOLATION
 	bool "Remove the kernel mapping in user mode"
 	default y
 	depends on X86_64 && SMP