x86/smap changes for v3.7

index 8c77c64..efc6a95 100644
@@ -32,6 +32,7 @@
 #include <asm/sigframe.h>
 #include <asm/sighandling.h>
 #include <asm/sys_ia32.h>
+#include <asm/smap.h>
 
 #define FIX_EFLAGS	__FIX_EFLAGS
 

@@ -251,11 +252,12 @@ static int ia32_restore_sigcontext(struct pt_regs *regs,
 
 		get_user_ex(tmp, &sc->fpstate);
 		buf = compat_ptr(tmp);
-		err |= restore_xstate_sig(buf, 1);
 
 		get_user_ex(*pax, &sc->ax);
 	} get_user_catch(err);
 
+	err |= restore_xstate_sig(buf, 1);
+
 	return err;
 }
 

@@ -506,7 +508,6 @@ int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 		put_user_ex(sig, &frame->sig);
 		put_user_ex(ptr_to_compat(&frame->info), &frame->pinfo);
 		put_user_ex(ptr_to_compat(&frame->uc), &frame->puc);
-		err |= copy_siginfo_to_user32(&frame->info, info);
 
 		/* Create the ucontext.  */
 		if (cpu_has_xsave)

@@ -518,9 +519,6 @@ int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 		put_user_ex(sas_ss_flags(regs->sp),
 			    &frame->uc.uc_stack.ss_flags);
 		put_user_ex(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
-		err |= ia32_setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
-					     regs, set->sig[0]);
-		err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
 
 		if (ka->sa.sa_flags & SA_RESTORER)
 			restorer = ka->sa.sa_restorer;

@@ -536,6 +534,11 @@ int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 		put_user_ex(*((u64 *)&code), (u64 __user *)frame->retcode);
 	} put_user_catch(err);
 
+	err |= copy_siginfo_to_user32(&frame->info, info);
+	err |= ia32_setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
+				     regs, set->sig[0]);
+	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+
 	if (err)
 		return -EFAULT;
 

index 952bd01..372231c 100644
@@ -1,3 +1,6 @@
+#ifndef _ASM_X86_ALTERNATIVE_ASM_H
+#define _ASM_X86_ALTERNATIVE_ASM_H
+
 #ifdef __ASSEMBLY__
 
 #include <asm/asm.h>

@@ -5,10 +8,10 @@
 #ifdef CONFIG_SMP
 	.macro LOCK_PREFIX
 672:	lock
-	.section .smp_locks,"a"
+	.pushsection .smp_locks,"a"
 	.balign 4
 	.long 672b - .
-	.previous
+	.popsection
 	.endm
 #else
 	.macro LOCK_PREFIX

@@ -24,3 +27,5 @@
 .endm
 
 #endif  /*  __ASSEMBLY__  */
+
+#endif /* _ASM_X86_ALTERNATIVE_ASM_H */

index 7078068..87bc00d 100644
@@ -29,10 +29,10 @@
 
 #ifdef CONFIG_SMP
 #define LOCK_PREFIX_HERE \
-		".section .smp_locks,\"a\"\n"	\
-		".balign 4\n"			\
-		".long 671f - .\n" /* offset */	\
-		".previous\n"			\
+		".pushsection .smp_locks,\"a\"\n"	\
+		".balign 4\n"				\
+		".long 671f - .\n" /* offset */		\
+		".popsection\n"				\
 		"671:"
 
 #define LOCK_PREFIX LOCK_PREFIX_HERE "\n\tlock; "

@@ -99,30 +99,30 @@ static inline int alternatives_text_reserved(void *start, void *end)
 /* alternative assembly primitive: */
 #define ALTERNATIVE(oldinstr, newinstr, feature)			\
 	OLDINSTR(oldinstr)						\
-	".section .altinstructions,\"a\"\n"				\
+	".pushsection .altinstructions,\"a\"\n"				\
 	ALTINSTR_ENTRY(feature, 1)					\
-	".previous\n"							\
-	".section .discard,\"aw\",@progbits\n"				\
+	".popsection\n"							\
+	".pushsection .discard,\"aw\",@progbits\n"			\
 	DISCARD_ENTRY(1)						\
-	".previous\n"							\
-	".section .altinstr_replacement, \"ax\"\n"			\
+	".popsection\n"							\
+	".pushsection .altinstr_replacement, \"ax\"\n"			\
 	ALTINSTR_REPLACEMENT(newinstr, feature, 1)			\
-	".previous"
+	".popsection"
 
 #define ALTERNATIVE_2(oldinstr, newinstr1, feature1, newinstr2, feature2)\
 	OLDINSTR(oldinstr)						\
-	".section .altinstructions,\"a\"\n"				\
+	".pushsection .altinstructions,\"a\"\n"				\
 	ALTINSTR_ENTRY(feature1, 1)					\
 	ALTINSTR_ENTRY(feature2, 2)					\
-	".previous\n"							\
-	".section .discard,\"aw\",@progbits\n"				\
+	".popsection\n"							\
+	".pushsection .discard,\"aw\",@progbits\n"			\
 	DISCARD_ENTRY(1)						\
 	DISCARD_ENTRY(2)						\
-	".previous\n"							\
-	".section .altinstr_replacement, \"ax\"\n"			\
+	".popsection\n"							\
+	".pushsection .altinstr_replacement, \"ax\"\n"			\
 	ALTINSTR_REPLACEMENT(newinstr1, feature1, 1)			\
 	ALTINSTR_REPLACEMENT(newinstr2, feature2, 2)			\
-	".previous"
+	".popsection"
 
 /*
  * This must be included *after* the definition of ALTERNATIVE due to

index 0debdb5..16cae42 100644
@@ -210,6 +210,7 @@
 #define X86_FEATURE_RTM		(9*32+11) /* Restricted Transactional Memory */
 #define X86_FEATURE_RDSEED	(9*32+18) /* The RDSEED instruction */
 #define X86_FEATURE_ADX		(9*32+19) /* The ADCX and ADOX instructions */
+#define X86_FEATURE_SMAP	(9*32+20) /* Supervisor Mode Access Prevention */
 
 #if defined(__KERNEL__) && !defined(__ASSEMBLY__)
 

79 lines not on this page · raw message

index 71ecbcb..f373046 100644
@@ -9,10 +9,13 @@
 #include <asm/asm.h>
 #include <asm/errno.h>
 #include <asm/processor.h>
+#include <asm/smap.h>
 
 #define __futex_atomic_op1(insn, ret, oldval, uaddr, oparg)	\
-	asm volatile("1:\t" insn "\n"				\
-		     "2:\t.section .fixup,\"ax\"\n"		\
+	asm volatile("\t" ASM_STAC "\n"				\
+		     "1:\t" insn "\n"				\
+		     "2:\t" ASM_CLAC "\n"			\
+		     "\t.section .fixup,\"ax\"\n"		\
 		     "3:\tmov\t%3, %1\n"			\
 		     "\tjmp\t2b\n"				\
 		     "\t.previous\n"				\

@@ -21,12 +24,14 @@
 		     : "i" (-EFAULT), "0" (oparg), "1" (0))
 
 #define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg)	\
-	asm volatile("1:\tmovl	%2, %0\n"			\
+	asm volatile("\t" ASM_STAC "\n"				\
+		     "1:\tmovl	%2, %0\n"			\
 		     "\tmovl\t%0, %3\n"				\
 		     "\t" insn "\n"				\
 		     "2:\t" LOCK_PREFIX "cmpxchgl %3, %2\n"	\
 		     "\tjnz\t1b\n"				\
-		     "3:\t.section .fixup,\"ax\"\n"		\
+		     "3:\t" ASM_CLAC "\n"			\
+		     "\t.section .fixup,\"ax\"\n"		\
 		     "4:\tmov\t%5, %1\n"			\
 		     "\tjmp\t3b\n"				\
 		     "\t.previous\n"				\

@@ -122,8 +127,10 @@ static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
 	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
 		return -EFAULT;
 
-	asm volatile("1:\t" LOCK_PREFIX "cmpxchgl %4, %2\n"
-		     "2:\t.section .fixup, \"ax\"\n"
+	asm volatile("\t" ASM_STAC "\n"
+		     "1:\t" LOCK_PREFIX "cmpxchgl %4, %2\n"
+		     "2:\t" ASM_CLAC "\n"
+		     "\t.section .fixup, \"ax\"\n"
 		     "3:\tmov     %3, %0\n"
 		     "\tjmp     2b\n"
 		     "\t.previous\n"

index aea1d1d..680cf09 100644
@@ -65,6 +65,7 @@
 #define X86_CR4_PCIDE	0x00020000 /* enable PCID support */
 #define X86_CR4_OSXSAVE 0x00040000 /* enable xsave and xrestore */
 #define X86_CR4_SMEP	0x00100000 /* enable SMEP support */
+#define X86_CR4_SMAP	0x00200000 /* enable SMAP support */
 
 /*
  * x86-64 Task Priority Register, CR8

91 lines not on this page · raw message

index e1f3a17..a91acfb 100644
@@ -9,6 +9,7 @@
 #include <linux/string.h>
 #include <asm/asm.h>
 #include <asm/page.h>
+#include <asm/smap.h>
 
 #define VERIFY_READ 0
 #define VERIFY_WRITE 1

@@ -192,9 +193,10 @@ extern int __get_user_bad(void);
 
 #ifdef CONFIG_X86_32
 #define __put_user_asm_u64(x, addr, err, errret)			\
-	asm volatile("1:	movl %%eax,0(%2)\n"			\
+	asm volatile(ASM_STAC "\n"					\
+		     "1:	movl %%eax,0(%2)\n"			\
 		     "2:	movl %%edx,4(%2)\n"			\
-		     "3:\n"						\
+		     "3: " ASM_CLAC "\n"				\
 		     ".section .fixup,\"ax\"\n"				\
 		     "4:	movl %3,%0\n"				\
 		     "	jmp 3b\n"					\

@@ -205,9 +207,10 @@ extern int __get_user_bad(void);
 		     : "A" (x), "r" (addr), "i" (errret), "0" (err))
 
 #define __put_user_asm_ex_u64(x, addr)					\
-	asm volatile("1:	movl %%eax,0(%1)\n"			\
+	asm volatile(ASM_STAC "\n"					\
+		     "1:	movl %%eax,0(%1)\n"			\
 		     "2:	movl %%edx,4(%1)\n"			\
-		     "3:\n"						\
+		     "3: " ASM_CLAC "\n"				\
 		     _ASM_EXTABLE_EX(1b, 2b)				\
 		     _ASM_EXTABLE_EX(2b, 3b)				\
 		     : : "A" (x), "r" (addr))

@@ -379,8 +382,9 @@ do {									\
 } while (0)
 
 #define __get_user_asm(x, addr, err, itype, rtype, ltype, errret)	\
-	asm volatile("1:	mov"itype" %2,%"rtype"1\n"		\
-		     "2:\n"						\
+	asm volatile(ASM_STAC "\n"					\
+		     "1:	mov"itype" %2,%"rtype"1\n"		\
+		     "2: " ASM_CLAC "\n"				\
 		     ".section .fixup,\"ax\"\n"				\
 		     "3:	mov %3,%0\n"				\
 		     "	xor"itype" %"rtype"1,%"rtype"1\n"		\

@@ -443,8 +447,9 @@ struct __large_struct { unsigned long buf[100]; };
  * aliasing issues.
  */
 #define __put_user_asm(x, addr, err, itype, rtype, ltype, errret)	\
-	asm volatile("1:	mov"itype" %"rtype"1,%2\n"		\
-		     "2:\n"						\
+	asm volatile(ASM_STAC "\n"					\
+		     "1:	mov"itype" %"rtype"1,%2\n"		\
+		     "2: " ASM_CLAC "\n"				\
 		     ".section .fixup,\"ax\"\n"				\
 		     "3:	mov %3,%0\n"				\
 		     "	jmp 2b\n"					\

@@ -463,13 +468,13 @@ struct __large_struct { unsigned long buf[100]; };
  * uaccess_try and catch
  */
 #define uaccess_try	do {						\
-	int prev_err = current_thread_info()->uaccess_err;		\
 	current_thread_info()->uaccess_err = 0;				\
+	stac();								\
 	barrier();
 
 #define uaccess_catch(err)						\
+	clac();								\
 	(err) |= (current_thread_info()->uaccess_err ? -EFAULT : 0);	\
-	current_thread_info()->uaccess_err = prev_err;			\
 } while (0)
 
 /**

@@ -569,6 +574,9 @@ strncpy_from_user(char *dst, const char __user *src, long count);
 extern __must_check long strlen_user(const char __user *str);
 extern __must_check long strnlen_user(const char __user *str, long n);
 
+unsigned long __must_check clear_user(void __user *mem, unsigned long len);
+unsigned long __must_check __clear_user(void __user *mem, unsigned long len);
+
 /*
  * movsl can be slow when source and dest are not both 8-byte aligned
  */

index 576e39b..7f760a9 100644
@@ -213,7 +213,4 @@ static inline unsigned long __must_check copy_from_user(void *to,
 	return n;
 }
 
-unsigned long __must_check clear_user(void __user *mem, unsigned long len);
-unsigned long __must_check __clear_user(void __user *mem, unsigned long len);
-
 #endif /* _ASM_X86_UACCESS_32_H */

index d8def8b..142810c 100644
@@ -217,9 +217,6 @@ int __copy_in_user(void __user *dst, const void __user *src, unsigned size)
 	}
 }
 
-__must_check unsigned long clear_user(void __user *mem, unsigned long len);
-__must_check unsigned long __clear_user(void __user *mem, unsigned long len);
-
 static __must_check __always_inline int
 __copy_from_user_inatomic(void *dst, const void __user *src, unsigned size)
 {

index 2ddee1b8..0415cda 100644
@@ -70,8 +70,9 @@ static inline int xsave_user(struct xsave_struct __user *buf)
 	if (unlikely(err))
 		return -EFAULT;
 
-	__asm__ __volatile__("1: .byte " REX_PREFIX "0x0f,0xae,0x27\n"
-			     "2:\n"
+	__asm__ __volatile__(ASM_STAC "\n"
+			     "1: .byte " REX_PREFIX "0x0f,0xae,0x27\n"
+			     "2: " ASM_CLAC "\n"
 			     ".section .fixup,\"ax\"\n"
 			     "3:  movl $-1,%[err]\n"
 			     "    jmp  2b\n"

@@ -90,8 +91,9 @@ static inline int xrestore_user(struct xsave_struct __user *buf, u64 mask)
 	u32 lmask = mask;
 	u32 hmask = mask >> 32;
 
-	__asm__ __volatile__("1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n"
-			     "2:\n"
+	__asm__ __volatile__(ASM_STAC "\n"
+			     "1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n"
+			     "2: " ASM_CLAC "\n"
 			     ".section .fixup,\"ax\"\n"
 			     "3:  movl $-1,%[err]\n"
 			     "    jmp  2b\n"

index 1b8e5a0..11676cf 100644
@@ -43,17 +43,22 @@ int acpi_suspend_lowlevel(void)
 
 	header->video_mode = saved_video_mode;
 
+	header->pmode_behavior = 0;
+
 #ifndef CONFIG_64BIT
 	store_gdt((struct desc_ptr *)&header->pmode_gdt);
 
-	if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low,
-		       &header->pmode_efer_high))
-		header->pmode_efer_low = header->pmode_efer_high = 0;
+	if (!rdmsr_safe(MSR_EFER,
+			&header->pmode_efer_low,
+			&header->pmode_efer_high))
+		header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_EFER);
 #endif /* !CONFIG_64BIT */
 
 	header->pmode_cr0 = read_cr0();
-	header->pmode_cr4 = read_cr4_safe();
-	header->pmode_behavior = 0;
+	if (__this_cpu_read(cpu_info.cpuid_level) >= 0) {
+		header->pmode_cr4 = read_cr4();
+		header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_CR4);
+	}
 	if (!rdmsr_safe(MSR_IA32_MISC_ENABLE,
 			&header->pmode_misc_en_low,
 			&header->pmode_misc_en_high))

81 lines not on this page · raw message

index e10f96a..036bddb 100644
@@ -114,11 +114,12 @@ int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
 		regs->orig_ax = -1;		/* disable syscall checks */
 
 		get_user_ex(buf, &sc->fpstate);
-		err |= restore_xstate_sig(buf, config_enabled(CONFIG_X86_32));
 
 		get_user_ex(*pax, &sc->ax);
 	} get_user_catch(err);
 
+	err |= restore_xstate_sig(buf, config_enabled(CONFIG_X86_32));
+
 	return err;
 }
 

@@ -355,7 +356,6 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 		put_user_ex(sig, &frame->sig);
 		put_user_ex(&frame->info, &frame->pinfo);
 		put_user_ex(&frame->uc, &frame->puc);
-		err |= copy_siginfo_to_user(&frame->info, info);
 
 		/* Create the ucontext.  */
 		if (cpu_has_xsave)

@@ -367,9 +367,6 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 		put_user_ex(sas_ss_flags(regs->sp),
 			    &frame->uc.uc_stack.ss_flags);
 		put_user_ex(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
-		err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
-					regs, set->sig[0]);
-		err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
 
 		/* Set up to return from userspace.  */
 		restorer = VDSO32_SYMBOL(current->mm->context.vdso, rt_sigreturn);

@@ -386,6 +383,11 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 		 */
 		put_user_ex(*((u64 *)&rt_retcode), (u64 *)frame->retcode);
 	} put_user_catch(err);
+	
+	err |= copy_siginfo_to_user(&frame->info, info);
+	err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
+				regs, set->sig[0]);
+	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
 
 	if (err)
 		return -EFAULT;

@@ -434,8 +436,6 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 		put_user_ex(sas_ss_flags(regs->sp),
 			    &frame->uc.uc_stack.ss_flags);
 		put_user_ex(me->sas_ss_size, &frame->uc.uc_stack.ss_size);
-		err |= setup_sigcontext(&frame->uc.uc_mcontext, fp, regs, set->sig[0]);
-		err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
 
 		/* Set up to return from userspace.  If provided, use a stub
 		   already in userspace.  */

@@ -448,6 +448,9 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 		}
 	} put_user_catch(err);
 
+	err |= setup_sigcontext(&frame->uc.uc_mcontext, fp, regs, set->sig[0]);
+	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+
 	if (err)
 		return -EFAULT;
 

@@ -504,9 +507,6 @@ static int x32_setup_rt_frame(int sig, struct k_sigaction *ka,
 			    &frame->uc.uc_stack.ss_flags);
 		put_user_ex(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
 		put_user_ex(0, &frame->uc.uc__pad0);
-		err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
-					regs, set->sig[0]);
-		err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
 
 		if (ka->sa.sa_flags & SA_RESTORER) {
 			restorer = ka->sa.sa_restorer;

@@ -518,6 +518,10 @@ static int x32_setup_rt_frame(int sig, struct k_sigaction *ka,
 		put_user_ex(restorer, &frame->pretcode);
 	} put_user_catch(err);
 
+	err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
+				regs, set->sig[0]);
+	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+
 	if (err)
 		return -EFAULT;
 

index 4e89b3d..ada87a3 100644
@@ -315,7 +315,7 @@ static inline int restore_user_xstate(void __user *buf, u64 xbv, int fx_only)
 		if ((unsigned long)buf % 64 || fx_only) {
 			u64 init_bv = pcntxt_mask & ~XSTATE_FPSSE;
 			xrstor_state(init_xstate_buf, init_bv);
-			return fxrstor_checking((__force void *) buf);
+			return fxrstor_user(buf);
 		} else {
 			u64 init_bv = pcntxt_mask & ~xbv;
 			if (unlikely(init_bv))

@@ -323,9 +323,9 @@ static inline int restore_user_xstate(void __user *buf, u64 xbv, int fx_only)
 			return xrestore_user(buf, xbv);
 		}
 	} else if (use_fxsr()) {
-		return fxrstor_checking((__force void *) buf);
+		return fxrstor_user(buf);
 	} else
-		return frstor_checking((__force void *) buf);
+		return frstor_user(buf);
 }
 
 int __restore_xstate_sig(void __user *buf, void __user *buf_fx, int size)

index 1781b2f..98f6d6b6 100644
@@ -42,10 +42,11 @@ do {									\
 	int __d0;							\
 	might_fault();							\
 	__asm__ __volatile__(						\
+		ASM_STAC "\n"						\
 		"0:	rep; stosl\n"					\
 		"	movl %2,%0\n"					\
 		"1:	rep; stosb\n"					\
-		"2:\n"							\
+		"2: " ASM_CLAC "\n"					\
 		".section .fixup,\"ax\"\n"				\
 		"3:	lea 0(%2,%0,4),%0\n"				\
 		"	jmp 2b\n"					\

@@ -626,10 +627,12 @@ survive:
 		return n;
 	}
 #endif
+	stac();
 	if (movsl_is_ok(to, from, n))
 		__copy_user(to, from, n);
 	else
 		n = __copy_user_intel(to, from, n);
+	clac();
 	return n;
 }
 EXPORT_SYMBOL(__copy_to_user_ll);

@@ -637,10 +640,12 @@ EXPORT_SYMBOL(__copy_to_user_ll);
 unsigned long __copy_from_user_ll(void *to, const void __user *from,
 					unsigned long n)
 {
+	stac();
 	if (movsl_is_ok(to, from, n))
 		__copy_user_zeroing(to, from, n);
 	else
 		n = __copy_user_zeroing_intel(to, from, n);
+	clac();
 	return n;
 }
 EXPORT_SYMBOL(__copy_from_user_ll);

@@ -648,11 +653,13 @@ EXPORT_SYMBOL(__copy_from_user_ll);
 unsigned long __copy_from_user_ll_nozero(void *to, const void __user *from,
 					 unsigned long n)
 {
+	stac();
 	if (movsl_is_ok(to, from, n))
 		__copy_user(to, from, n);
 	else
 		n = __copy_user_intel((void __user *)to,
 				      (const void *)from, n);
+	clac();
 	return n;
 }
 EXPORT_SYMBOL(__copy_from_user_ll_nozero);

@@ -660,6 +667,7 @@ EXPORT_SYMBOL(__copy_from_user_ll_nozero);
 unsigned long __copy_from_user_ll_nocache(void *to, const void __user *from,
 					unsigned long n)
 {
+	stac();
 #ifdef CONFIG_X86_INTEL_USERCOPY
 	if (n > 64 && cpu_has_xmm2)
 		n = __copy_user_zeroing_intel_nocache(to, from, n);

@@ -668,6 +676,7 @@ unsigned long __copy_from_user_ll_nocache(void *to, const void __user *from,
 #else
 	__copy_user_zeroing(to, from, n);
 #endif
+	clac();
 	return n;
 }
 EXPORT_SYMBOL(__copy_from_user_ll_nocache);

@@ -675,6 +684,7 @@ EXPORT_SYMBOL(__copy_from_user_ll_nocache);
 unsigned long __copy_from_user_ll_nocache_nozero(void *to, const void __user *from,
 					unsigned long n)
 {
+	stac();
 #ifdef CONFIG_X86_INTEL_USERCOPY
 	if (n > 64 && cpu_has_xmm2)
 		n = __copy_user_intel_nocache(to, from, n);

@@ -683,6 +693,7 @@ unsigned long __copy_from_user_ll_nocache_nozero(void *to, const void __user *fr
 #else
 	__copy_user(to, from, n);
 #endif
+	clac();
 	return n;
 }
 EXPORT_SYMBOL(__copy_from_user_ll_nocache_nozero);

index e5b130b..05928aa 100644
@@ -18,6 +18,7 @@ unsigned long __clear_user(void __user *addr, unsigned long size)
 	might_fault();
 	/* no memory constraint because it doesn't change any memory gcc knows
 	   about */
+	stac();
 	asm volatile(
 		"	testq  %[size8],%[size8]\n"
 		"	jz     4f\n"

@@ -40,6 +41,7 @@ unsigned long __clear_user(void __user *addr, unsigned long size)
 		: [size8] "=&c"(size), [dst] "=&D" (__d0)
 		: [size1] "r"(size & 7), "[size8]" (size / 8), "[dst]"(addr),
 		  [zero] "r" (0UL), [eight] "r" (8UL));
+	clac();
 	return size;
 }
 EXPORT_SYMBOL(__clear_user);

@@ -82,5 +84,6 @@ copy_user_handle_tail(char *to, char *from, unsigned len, unsigned zerorest)
 	for (c = 0, zero_len = len; zerorest && zero_len; --zero_len)
 		if (__put_user_nocheck(c, to++, sizeof(char)))
 			break;
+	clac();
 	return len;
 }

index 76dcd9d..f2fb75d 100644
@@ -995,6 +995,17 @@ static int fault_in_kernel_space(unsigned long address)
 	return address >= TASK_SIZE_MAX;
 }
 
+static inline bool smap_violation(int error_code, struct pt_regs *regs)
+{
+	if (error_code & PF_USER)
+		return false;
+
+	if (!user_mode_vm(regs) && (regs->flags & X86_EFLAGS_AC))
+		return false;
+
+	return true;
+}
+
 /*
  * This routine handles page faults.  It determines the address,
  * and the problem, and then passes it off to one of the appropriate

@@ -1088,6 +1099,13 @@ do_page_fault(struct pt_regs *regs, unsigned long error_code)
 	if (unlikely(error_code & PF_RSVD))
 		pgtable_bad(regs, error_code, address);
 
+	if (static_cpu_has(X86_FEATURE_SMAP)) {
+		if (unlikely(smap_violation(error_code, regs))) {
+			bad_area_nosemaphore(regs, error_code, address);
+			return;
+		}
+	}
+
 	perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
 
 	/*

index 575d86f..e537b35 100644
@@ -712,7 +712,7 @@ static void __init test_wp_bit(void)
   "Checking if this processor honours the WP bit even in supervisor mode...");
 
 	/* Any page-aligned address will do, the test is non-destructive */
-	__set_fixmap(FIX_WP_TEST, __pa(&swapper_pg_dir), PAGE_READONLY);
+	__set_fixmap(FIX_WP_TEST, __pa(&swapper_pg_dir), PAGE_KERNEL_RO);
 	boot_cpu_data.wp_works_ok = do_test_wp_bit();
 	clear_fixmap(FIX_WP_TEST);
 

index 9317e00..7dd86a4 100644
@@ -36,5 +36,7 @@ extern struct wakeup_header wakeup_header;
 
 /* Wakeup behavior bits */
 #define WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE     0
+#define WAKEUP_BEHAVIOR_RESTORE_CR4		1
+#define WAKEUP_BEHAVIOR_RESTORE_EFER		2
 
 #endif /* ARCH_X86_KERNEL_ACPI_RM_WAKEUP_H */