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From: "Mike Pagano" <mpagano@gentoo.org>
To: gentoo-commits@lists.gentoo.org
Subject: [gentoo-commits] proj/linux-patches:4.19 commit in: /
Date: Sun, 22 Nov 2020 19:26:21 +0000 (UTC)	[thread overview]
Message-ID: <1606073166.c869a8b6a8317d09e7c35c8fba10cc10a0200cc5.mpagano@gentoo> (raw)

commit:     c869a8b6a8317d09e7c35c8fba10cc10a0200cc5
Author:     Mike Pagano <mpagano <AT> gentoo <DOT> org>
AuthorDate: Sun Nov 22 19:26:06 2020 +0000
Commit:     Mike Pagano <mpagano <AT> gentoo <DOT> org>
CommitDate: Sun Nov 22 19:26:06 2020 +0000
URL:        https://gitweb.gentoo.org/proj/linux-patches.git/commit/?id=c869a8b6

Linux patch 4.19.159

Signed-off-by: Mike Pagano <mpagano <AT> gentoo.org>

 0000_README               |    4 +
 1158_linux-4.19.159.patch | 1417 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 1421 insertions(+)

diff --git a/0000_README b/0000_README
index 9824d3a..9a90375 100644
--- a/0000_README
+++ b/0000_README
@@ -671,6 +671,10 @@ Patch:  1157_linux-4.19.158.patch
 From:   https://www.kernel.org
 Desc:   Linux 4.19.158
 
+Patch:  1158_linux-4.19.159.patch
+From:   https://www.kernel.org
+Desc:   Linux 4.19.159
+
 Patch:  1500_XATTR_USER_PREFIX.patch
 From:   https://bugs.gentoo.org/show_bug.cgi?id=470644
 Desc:   Support for namespace user.pax.* on tmpfs.

diff --git a/1158_linux-4.19.159.patch b/1158_linux-4.19.159.patch
new file mode 100644
index 0000000..2992776
--- /dev/null
+++ b/1158_linux-4.19.159.patch
@@ -0,0 +1,1417 @@
+diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
+index 8dbc8d4ec8f0c..7371643dd8d4f 100644
+--- a/Documentation/admin-guide/kernel-parameters.txt
++++ b/Documentation/admin-guide/kernel-parameters.txt
+@@ -2560,6 +2560,8 @@
+ 					       mds=off [X86]
+ 					       tsx_async_abort=off [X86]
+ 					       kvm.nx_huge_pages=off [X86]
++					       no_entry_flush [PPC]
++					       no_uaccess_flush [PPC]
+ 
+ 				Exceptions:
+ 					       This does not have any effect on
+@@ -2870,6 +2872,8 @@
+ 
+ 	noefi		Disable EFI runtime services support.
+ 
++	no_entry_flush  [PPC] Don't flush the L1-D cache when entering the kernel.
++
+ 	noexec		[IA-64]
+ 
+ 	noexec		[X86]
+@@ -2919,6 +2923,9 @@
+ 	nospec_store_bypass_disable
+ 			[HW] Disable all mitigations for the Speculative Store Bypass vulnerability
+ 
++	no_uaccess_flush
++	                [PPC] Don't flush the L1-D cache after accessing user data.
++
+ 	noxsave		[BUGS=X86] Disables x86 extended register state save
+ 			and restore using xsave. The kernel will fallback to
+ 			enabling legacy floating-point and sse state.
+diff --git a/Makefile b/Makefile
+index 698a9cc2864bd..593fdbce712d7 100644
+--- a/Makefile
++++ b/Makefile
+@@ -1,7 +1,7 @@
+ # SPDX-License-Identifier: GPL-2.0
+ VERSION = 4
+ PATCHLEVEL = 19
+-SUBLEVEL = 158
++SUBLEVEL = 159
+ EXTRAVERSION =
+ NAME = "People's Front"
+ 
+diff --git a/arch/powerpc/include/asm/book3s/64/kup-radix.h b/arch/powerpc/include/asm/book3s/64/kup-radix.h
+new file mode 100644
+index 0000000000000..aa54ac2e5659e
+--- /dev/null
++++ b/arch/powerpc/include/asm/book3s/64/kup-radix.h
+@@ -0,0 +1,22 @@
++/* SPDX-License-Identifier: GPL-2.0 */
++#ifndef _ASM_POWERPC_BOOK3S_64_KUP_RADIX_H
++#define _ASM_POWERPC_BOOK3S_64_KUP_RADIX_H
++
++DECLARE_STATIC_KEY_FALSE(uaccess_flush_key);
++
++/* Prototype for function defined in exceptions-64s.S */
++void do_uaccess_flush(void);
++
++static __always_inline void allow_user_access(void __user *to, const void __user *from,
++					      unsigned long size)
++{
++}
++
++static inline void prevent_user_access(void __user *to, const void __user *from,
++				       unsigned long size)
++{
++	if (static_branch_unlikely(&uaccess_flush_key))
++		do_uaccess_flush();
++}
++
++#endif /* _ASM_POWERPC_BOOK3S_64_KUP_RADIX_H */
+diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h
+index a86feddddad0c..35fb5b11955a0 100644
+--- a/arch/powerpc/include/asm/exception-64s.h
++++ b/arch/powerpc/include/asm/exception-64s.h
+@@ -90,11 +90,18 @@
+ 	nop;								\
+ 	nop
+ 
++#define ENTRY_FLUSH_SLOT						\
++	ENTRY_FLUSH_FIXUP_SECTION;					\
++	nop;								\
++	nop;								\
++	nop;
++
+ /*
+  * r10 must be free to use, r13 must be paca
+  */
+ #define INTERRUPT_TO_KERNEL						\
+-	STF_ENTRY_BARRIER_SLOT
++	STF_ENTRY_BARRIER_SLOT;						\
++	ENTRY_FLUSH_SLOT
+ 
+ /*
+  * Macros for annotating the expected destination of (h)rfid
+diff --git a/arch/powerpc/include/asm/feature-fixups.h b/arch/powerpc/include/asm/feature-fixups.h
+index 40a6c9261a6bf..5bf3f0779b936 100644
+--- a/arch/powerpc/include/asm/feature-fixups.h
++++ b/arch/powerpc/include/asm/feature-fixups.h
+@@ -205,6 +205,22 @@ label##3:					       	\
+ 	FTR_ENTRY_OFFSET 955b-956b;			\
+ 	.popsection;
+ 
++#define UACCESS_FLUSH_FIXUP_SECTION			\
++959:							\
++	.pushsection __uaccess_flush_fixup,"a";		\
++	.align 2;					\
++960:							\
++	FTR_ENTRY_OFFSET 959b-960b;			\
++	.popsection;
++
++#define ENTRY_FLUSH_FIXUP_SECTION			\
++957:							\
++	.pushsection __entry_flush_fixup,"a";		\
++	.align 2;					\
++958:							\
++	FTR_ENTRY_OFFSET 957b-958b;			\
++	.popsection;
++
+ #define RFI_FLUSH_FIXUP_SECTION				\
+ 951:							\
+ 	.pushsection __rfi_flush_fixup,"a";		\
+@@ -237,8 +253,11 @@ label##3:					       	\
+ #include <linux/types.h>
+ 
+ extern long stf_barrier_fallback;
++extern long entry_flush_fallback;
+ extern long __start___stf_entry_barrier_fixup, __stop___stf_entry_barrier_fixup;
+ extern long __start___stf_exit_barrier_fixup, __stop___stf_exit_barrier_fixup;
++extern long __start___uaccess_flush_fixup, __stop___uaccess_flush_fixup;
++extern long __start___entry_flush_fixup, __stop___entry_flush_fixup;
+ extern long __start___rfi_flush_fixup, __stop___rfi_flush_fixup;
+ extern long __start___barrier_nospec_fixup, __stop___barrier_nospec_fixup;
+ extern long __start__btb_flush_fixup, __stop__btb_flush_fixup;
+diff --git a/arch/powerpc/include/asm/futex.h b/arch/powerpc/include/asm/futex.h
+index 2a7b01f97a56b..1eabc20dddd38 100644
+--- a/arch/powerpc/include/asm/futex.h
++++ b/arch/powerpc/include/asm/futex.h
+@@ -35,6 +35,7 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
+ {
+ 	int oldval = 0, ret;
+ 
++	allow_write_to_user(uaddr, sizeof(*uaddr));
+ 	pagefault_disable();
+ 
+ 	switch (op) {
+@@ -61,6 +62,7 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
+ 
+ 	*oval = oldval;
+ 
++	prevent_write_to_user(uaddr, sizeof(*uaddr));
+ 	return ret;
+ }
+ 
+@@ -74,6 +76,7 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
+ 	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
+ 		return -EFAULT;
+ 
++	allow_write_to_user(uaddr, sizeof(*uaddr));
+         __asm__ __volatile__ (
+         PPC_ATOMIC_ENTRY_BARRIER
+ "1:     lwarx   %1,0,%3         # futex_atomic_cmpxchg_inatomic\n\
+@@ -94,6 +97,7 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
+         : "cc", "memory");
+ 
+ 	*uval = prev;
++	prevent_write_to_user(uaddr, sizeof(*uaddr));
+         return ret;
+ }
+ 
+diff --git a/arch/powerpc/include/asm/kup.h b/arch/powerpc/include/asm/kup.h
+new file mode 100644
+index 0000000000000..f0f8e36ad71f5
+--- /dev/null
++++ b/arch/powerpc/include/asm/kup.h
+@@ -0,0 +1,40 @@
++/* SPDX-License-Identifier: GPL-2.0 */
++#ifndef _ASM_POWERPC_KUP_H_
++#define _ASM_POWERPC_KUP_H_
++
++#ifndef __ASSEMBLY__
++
++#include <asm/pgtable.h>
++
++#ifdef CONFIG_PPC_BOOK3S_64
++#include <asm/book3s/64/kup-radix.h>
++#else
++static inline void allow_user_access(void __user *to, const void __user *from,
++				     unsigned long size) { }
++static inline void prevent_user_access(void __user *to, const void __user *from,
++				       unsigned long size) { }
++#endif /* CONFIG_PPC_BOOK3S_64 */
++
++static inline void allow_read_from_user(const void __user *from, unsigned long size)
++{
++	allow_user_access(NULL, from, size);
++}
++
++static inline void allow_write_to_user(void __user *to, unsigned long size)
++{
++	allow_user_access(to, NULL, size);
++}
++
++static inline void prevent_read_from_user(const void __user *from, unsigned long size)
++{
++	prevent_user_access(NULL, from, size);
++}
++
++static inline void prevent_write_to_user(void __user *to, unsigned long size)
++{
++	prevent_user_access(to, NULL, size);
++}
++
++#endif /* !__ASSEMBLY__ */
++
++#endif /* _ASM_POWERPC_KUP_H_ */
+diff --git a/arch/powerpc/include/asm/security_features.h b/arch/powerpc/include/asm/security_features.h
+index ccf44c135389a..3b45a64e491e5 100644
+--- a/arch/powerpc/include/asm/security_features.h
++++ b/arch/powerpc/include/asm/security_features.h
+@@ -84,12 +84,19 @@ static inline bool security_ftr_enabled(unsigned long feature)
+ // Software required to flush link stack on context switch
+ #define SEC_FTR_FLUSH_LINK_STACK	0x0000000000001000ull
+ 
++// The L1-D cache should be flushed when entering the kernel
++#define SEC_FTR_L1D_FLUSH_ENTRY		0x0000000000004000ull
++
++// The L1-D cache should be flushed after user accesses from the kernel
++#define SEC_FTR_L1D_FLUSH_UACCESS	0x0000000000008000ull
+ 
+ // Features enabled by default
+ #define SEC_FTR_DEFAULT \
+ 	(SEC_FTR_L1D_FLUSH_HV | \
+ 	 SEC_FTR_L1D_FLUSH_PR | \
+ 	 SEC_FTR_BNDS_CHK_SPEC_BAR | \
++	 SEC_FTR_L1D_FLUSH_ENTRY | \
++	 SEC_FTR_L1D_FLUSH_UACCESS | \
+ 	 SEC_FTR_FAVOUR_SECURITY)
+ 
+ #endif /* _ASM_POWERPC_SECURITY_FEATURES_H */
+diff --git a/arch/powerpc/include/asm/setup.h b/arch/powerpc/include/asm/setup.h
+index 65676e2325b85..6f2f4497e13b3 100644
+--- a/arch/powerpc/include/asm/setup.h
++++ b/arch/powerpc/include/asm/setup.h
+@@ -52,12 +52,16 @@ enum l1d_flush_type {
+ };
+ 
+ void setup_rfi_flush(enum l1d_flush_type, bool enable);
++void setup_entry_flush(bool enable);
++void setup_uaccess_flush(bool enable);
+ void do_rfi_flush_fixups(enum l1d_flush_type types);
+ #ifdef CONFIG_PPC_BARRIER_NOSPEC
+ void setup_barrier_nospec(void);
+ #else
+ static inline void setup_barrier_nospec(void) { };
+ #endif
++void do_uaccess_flush_fixups(enum l1d_flush_type types);
++void do_entry_flush_fixups(enum l1d_flush_type types);
+ void do_barrier_nospec_fixups(bool enable);
+ extern bool barrier_nospec_enabled;
+ 
+diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
+index 38a25ff8afb76..ab6612e35ace3 100644
+--- a/arch/powerpc/include/asm/uaccess.h
++++ b/arch/powerpc/include/asm/uaccess.h
+@@ -6,6 +6,7 @@
+ #include <asm/processor.h>
+ #include <asm/page.h>
+ #include <asm/extable.h>
++#include <asm/kup.h>
+ 
+ /*
+  * The fs value determines whether argument validity checking should be
+@@ -91,9 +92,14 @@ static inline int __access_ok(unsigned long addr, unsigned long size,
+ 	__put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
+ 
+ #define __get_user(x, ptr) \
+-	__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
++	__get_user_nocheck((x), (ptr), sizeof(*(ptr)), true)
+ #define __put_user(x, ptr) \
+-	__put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
++	__put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)), true)
++
++#define __get_user_allowed(x, ptr) \
++	__get_user_nocheck((x), (ptr), sizeof(*(ptr)), false)
++#define __put_user_allowed(x, ptr) \
++	__put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)), false)
+ 
+ #define __get_user_inatomic(x, ptr) \
+ 	__get_user_nosleep((x), (ptr), sizeof(*(ptr)))
+@@ -138,7 +144,7 @@ extern long __put_user_bad(void);
+ 		: "r" (x), "b" (addr), "i" (-EFAULT), "0" (err))
+ #endif /* __powerpc64__ */
+ 
+-#define __put_user_size(x, ptr, size, retval)			\
++#define __put_user_size_allowed(x, ptr, size, retval)		\
+ do {								\
+ 	retval = 0;						\
+ 	switch (size) {						\
+@@ -150,14 +156,28 @@ do {								\
+ 	}							\
+ } while (0)
+ 
+-#define __put_user_nocheck(x, ptr, size)			\
++#define __put_user_size(x, ptr, size, retval)			\
++do {								\
++	allow_write_to_user(ptr, size);				\
++	__put_user_size_allowed(x, ptr, size, retval);		\
++	prevent_write_to_user(ptr, size);			\
++} while (0)
++
++#define __put_user_nocheck(x, ptr, size, do_allow)			\
+ ({								\
+ 	long __pu_err;						\
+ 	__typeof__(*(ptr)) __user *__pu_addr = (ptr);		\
++	__typeof__(*(ptr)) __pu_val = (x);			\
++	__typeof__(size) __pu_size = (size);			\
++								\
+ 	if (!is_kernel_addr((unsigned long)__pu_addr))		\
+ 		might_fault();					\
+-	__chk_user_ptr(ptr);					\
+-	__put_user_size((x), __pu_addr, (size), __pu_err);	\
++	__chk_user_ptr(__pu_addr);				\
++	if (do_allow)								\
++		__put_user_size(__pu_val, __pu_addr, __pu_size, __pu_err);	\
++	else									\
++		__put_user_size_allowed(__pu_val, __pu_addr, __pu_size, __pu_err); \
++								\
+ 	__pu_err;						\
+ })
+ 
+@@ -165,9 +185,13 @@ do {								\
+ ({									\
+ 	long __pu_err = -EFAULT;					\
+ 	__typeof__(*(ptr)) __user *__pu_addr = (ptr);			\
++	__typeof__(*(ptr)) __pu_val = (x);				\
++	__typeof__(size) __pu_size = (size);				\
++									\
+ 	might_fault();							\
+-	if (access_ok(VERIFY_WRITE, __pu_addr, size))			\
+-		__put_user_size((x), __pu_addr, (size), __pu_err);	\
++	if (access_ok(VERIFY_WRITE, __pu_addr, __pu_size))			\
++		__put_user_size(__pu_val, __pu_addr, __pu_size, __pu_err); \
++									\
+ 	__pu_err;							\
+ })
+ 
+@@ -175,8 +199,12 @@ do {								\
+ ({								\
+ 	long __pu_err;						\
+ 	__typeof__(*(ptr)) __user *__pu_addr = (ptr);		\
+-	__chk_user_ptr(ptr);					\
+-	__put_user_size((x), __pu_addr, (size), __pu_err);	\
++	__typeof__(*(ptr)) __pu_val = (x);			\
++	__typeof__(size) __pu_size = (size);			\
++								\
++	__chk_user_ptr(__pu_addr);				\
++	__put_user_size(__pu_val, __pu_addr, __pu_size, __pu_err); \
++								\
+ 	__pu_err;						\
+ })
+ 
+@@ -234,7 +262,7 @@ extern long __get_user_bad(void);
+ 		: "b" (addr), "i" (-EFAULT), "0" (err))
+ #endif /* __powerpc64__ */
+ 
+-#define __get_user_size(x, ptr, size, retval)			\
++#define __get_user_size_allowed(x, ptr, size, retval)		\
+ do {								\
+ 	retval = 0;						\
+ 	__chk_user_ptr(ptr);					\
+@@ -249,6 +277,13 @@ do {								\
+ 	}							\
+ } while (0)
+ 
++#define __get_user_size(x, ptr, size, retval)			\
++do {								\
++	allow_read_from_user(ptr, size);			\
++	__get_user_size_allowed(x, ptr, size, retval);		\
++	prevent_read_from_user(ptr, size);			\
++} while (0)
++
+ /*
+  * This is a type: either unsigned long, if the argument fits into
+  * that type, or otherwise unsigned long long.
+@@ -256,17 +291,23 @@ do {								\
+ #define __long_type(x) \
+ 	__typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL))
+ 
+-#define __get_user_nocheck(x, ptr, size)			\
++#define __get_user_nocheck(x, ptr, size, do_allow)			\
+ ({								\
+ 	long __gu_err;						\
+ 	__long_type(*(ptr)) __gu_val;				\
+ 	__typeof__(*(ptr)) __user *__gu_addr = (ptr);	\
+-	__chk_user_ptr(ptr);					\
++	__typeof__(size) __gu_size = (size);			\
++								\
++	__chk_user_ptr(__gu_addr);				\
+ 	if (!is_kernel_addr((unsigned long)__gu_addr))		\
+ 		might_fault();					\
+ 	barrier_nospec();					\
+-	__get_user_size(__gu_val, __gu_addr, (size), __gu_err);	\
++	if (do_allow)								\
++		__get_user_size(__gu_val, __gu_addr, __gu_size, __gu_err);	\
++	else									\
++		__get_user_size_allowed(__gu_val, __gu_addr, __gu_size, __gu_err); \
+ 	(x) = (__typeof__(*(ptr)))__gu_val;			\
++								\
+ 	__gu_err;						\
+ })
+ 
+@@ -275,12 +316,15 @@ do {								\
+ 	long __gu_err = -EFAULT;					\
+ 	__long_type(*(ptr)) __gu_val = 0;				\
+ 	__typeof__(*(ptr)) __user *__gu_addr = (ptr);		\
++	__typeof__(size) __gu_size = (size);				\
++									\
+ 	might_fault();							\
+-	if (access_ok(VERIFY_READ, __gu_addr, (size))) {		\
++	if (access_ok(VERIFY_READ, __gu_addr, __gu_size)) {		\
+ 		barrier_nospec();					\
+-		__get_user_size(__gu_val, __gu_addr, (size), __gu_err);	\
++		__get_user_size(__gu_val, __gu_addr, __gu_size, __gu_err); \
+ 	}								\
+ 	(x) = (__force __typeof__(*(ptr)))__gu_val;				\
++									\
+ 	__gu_err;							\
+ })
+ 
+@@ -289,10 +333,13 @@ do {								\
+ 	long __gu_err;						\
+ 	__long_type(*(ptr)) __gu_val;				\
+ 	__typeof__(*(ptr)) __user *__gu_addr = (ptr);	\
+-	__chk_user_ptr(ptr);					\
++	__typeof__(size) __gu_size = (size);			\
++								\
++	__chk_user_ptr(__gu_addr);				\
+ 	barrier_nospec();					\
+-	__get_user_size(__gu_val, __gu_addr, (size), __gu_err);	\
++	__get_user_size(__gu_val, __gu_addr, __gu_size, __gu_err); \
+ 	(x) = (__force __typeof__(*(ptr)))__gu_val;			\
++								\
+ 	__gu_err;						\
+ })
+ 
+@@ -306,16 +353,22 @@ extern unsigned long __copy_tofrom_user(void __user *to,
+ static inline unsigned long
+ raw_copy_in_user(void __user *to, const void __user *from, unsigned long n)
+ {
++	unsigned long ret;
++
+ 	barrier_nospec();
+-	return __copy_tofrom_user(to, from, n);
++	allow_user_access(to, from, n);
++	ret = __copy_tofrom_user(to, from, n);
++	prevent_user_access(to, from, n);
++	return ret;
+ }
+ #endif /* __powerpc64__ */
+ 
+ static inline unsigned long raw_copy_from_user(void *to,
+ 		const void __user *from, unsigned long n)
+ {
++	unsigned long ret;
+ 	if (__builtin_constant_p(n) && (n <= 8)) {
+-		unsigned long ret = 1;
++		ret = 1;
+ 
+ 		switch (n) {
+ 		case 1:
+@@ -340,27 +393,30 @@ static inline unsigned long raw_copy_from_user(void *to,
+ 	}
+ 
+ 	barrier_nospec();
+-	return __copy_tofrom_user((__force void __user *)to, from, n);
++	allow_read_from_user(from, n);
++	ret = __copy_tofrom_user((__force void __user *)to, from, n);
++	prevent_read_from_user(from, n);
++	return ret;
+ }
+ 
+-static inline unsigned long raw_copy_to_user(void __user *to,
+-		const void *from, unsigned long n)
++static inline unsigned long
++raw_copy_to_user_allowed(void __user *to, const void *from, unsigned long n)
+ {
+ 	if (__builtin_constant_p(n) && (n <= 8)) {
+ 		unsigned long ret = 1;
+ 
+ 		switch (n) {
+ 		case 1:
+-			__put_user_size(*(u8 *)from, (u8 __user *)to, 1, ret);
++			__put_user_size_allowed(*(u8 *)from, (u8 __user *)to, 1, ret);
+ 			break;
+ 		case 2:
+-			__put_user_size(*(u16 *)from, (u16 __user *)to, 2, ret);
++			__put_user_size_allowed(*(u16 *)from, (u16 __user *)to, 2, ret);
+ 			break;
+ 		case 4:
+-			__put_user_size(*(u32 *)from, (u32 __user *)to, 4, ret);
++			__put_user_size_allowed(*(u32 *)from, (u32 __user *)to, 4, ret);
+ 			break;
+ 		case 8:
+-			__put_user_size(*(u64 *)from, (u64 __user *)to, 8, ret);
++			__put_user_size_allowed(*(u64 *)from, (u64 __user *)to, 8, ret);
+ 			break;
+ 		}
+ 		if (ret == 0)
+@@ -370,14 +426,34 @@ static inline unsigned long raw_copy_to_user(void __user *to,
+ 	return __copy_tofrom_user(to, (__force const void __user *)from, n);
+ }
+ 
+-extern unsigned long __clear_user(void __user *addr, unsigned long size);
++static inline unsigned long
++raw_copy_to_user(void __user *to, const void *from, unsigned long n)
++{
++	unsigned long ret;
++
++	allow_write_to_user(to, n);
++	ret = raw_copy_to_user_allowed(to, from, n);
++	prevent_write_to_user(to, n);
++	return ret;
++}
++
++unsigned long __arch_clear_user(void __user *addr, unsigned long size);
+ 
+ static inline unsigned long clear_user(void __user *addr, unsigned long size)
+ {
++	unsigned long ret = size;
+ 	might_fault();
+-	if (likely(access_ok(VERIFY_WRITE, addr, size)))
+-		return __clear_user(addr, size);
+-	return size;
++	if (likely(access_ok(VERIFY_WRITE, addr, size))) {
++		allow_write_to_user(addr, size);
++		ret = __arch_clear_user(addr, size);
++		prevent_write_to_user(addr, size);
++	}
++	return ret;
++}
++
++static inline unsigned long __clear_user(void __user *addr, unsigned long size)
++{
++	return clear_user(addr, size);
+ }
+ 
+ extern long strncpy_from_user(char *dst, const char __user *src, long count);
+@@ -388,4 +464,13 @@ extern long __copy_from_user_flushcache(void *dst, const void __user *src,
+ extern void memcpy_page_flushcache(char *to, struct page *page, size_t offset,
+ 			   size_t len);
+ 
++#define user_access_begin(type, ptr, len) access_ok(type, ptr, len)
++#define user_access_end()		  prevent_user_access(NULL, NULL, ~0ul)
++
++#define unsafe_op_wrap(op, err) do { if (unlikely(op)) goto err; } while (0)
++#define unsafe_get_user(x, p, e) unsafe_op_wrap(__get_user_allowed(x, p), e)
++#define unsafe_put_user(x, p, e) unsafe_op_wrap(__put_user_allowed(x, p), e)
++#define unsafe_copy_to_user(d, s, l, e) \
++	unsafe_op_wrap(raw_copy_to_user_allowed(d, s, l), e)
++
+ #endif	/* _ARCH_POWERPC_UACCESS_H */
+diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
+index e1dab9b1e4478..344e2758b22df 100644
+--- a/arch/powerpc/kernel/exceptions-64s.S
++++ b/arch/powerpc/kernel/exceptions-64s.S
+@@ -540,7 +540,7 @@ EXC_COMMON_BEGIN(unrecover_mce)
+ 	b	1b
+ 
+ 
+-EXC_REAL(data_access, 0x300, 0x80)
++EXC_REAL_OOL(data_access, 0x300, 0x80)
+ EXC_VIRT(data_access, 0x4300, 0x80, 0x300)
+ TRAMP_KVM_SKIP(PACA_EXGEN, 0x300)
+ 
+@@ -572,13 +572,16 @@ ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
+ EXC_REAL_BEGIN(data_access_slb, 0x380, 0x80)
+ 	SET_SCRATCH0(r13)
+ 	EXCEPTION_PROLOG_0(PACA_EXSLB)
++	b tramp_data_access_slb
++EXC_REAL_END(data_access_slb, 0x380, 0x80)
++
++TRAMP_REAL_BEGIN(tramp_data_access_slb)
+ 	EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x380)
+ 	mr	r12,r3	/* save r3 */
+ 	mfspr	r3,SPRN_DAR
+ 	mfspr	r11,SPRN_SRR1
+ 	crset	4*cr6+eq
+ 	BRANCH_TO_COMMON(r10, slb_miss_common)
+-EXC_REAL_END(data_access_slb, 0x380, 0x80)
+ 
+ EXC_VIRT_BEGIN(data_access_slb, 0x4380, 0x80)
+ 	SET_SCRATCH0(r13)
+@@ -593,7 +596,7 @@ EXC_VIRT_END(data_access_slb, 0x4380, 0x80)
+ TRAMP_KVM_SKIP(PACA_EXSLB, 0x380)
+ 
+ 
+-EXC_REAL(instruction_access, 0x400, 0x80)
++EXC_REAL_OOL(instruction_access, 0x400, 0x80)
+ EXC_VIRT(instruction_access, 0x4400, 0x80, 0x400)
+ TRAMP_KVM(PACA_EXGEN, 0x400)
+ 
+@@ -616,13 +619,16 @@ ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
+ EXC_REAL_BEGIN(instruction_access_slb, 0x480, 0x80)
+ 	SET_SCRATCH0(r13)
+ 	EXCEPTION_PROLOG_0(PACA_EXSLB)
++	b tramp_instruction_access_slb
++EXC_REAL_END(instruction_access_slb, 0x480, 0x80)
++
++TRAMP_REAL_BEGIN(tramp_instruction_access_slb)
+ 	EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x480)
+ 	mr	r12,r3	/* save r3 */
+ 	mfspr	r3,SPRN_SRR0		/* SRR0 is faulting address */
+ 	mfspr	r11,SPRN_SRR1
+ 	crclr	4*cr6+eq
+ 	BRANCH_TO_COMMON(r10, slb_miss_common)
+-EXC_REAL_END(instruction_access_slb, 0x480, 0x80)
+ 
+ EXC_VIRT_BEGIN(instruction_access_slb, 0x4480, 0x80)
+ 	SET_SCRATCH0(r13)
+@@ -883,13 +889,13 @@ END_FTR_SECTION_IFSET(CPU_FTR_TM)
+ 
+ 
+ EXC_REAL_OOL_MASKABLE(decrementer, 0x900, 0x80, IRQS_DISABLED)
+-EXC_VIRT_MASKABLE(decrementer, 0x4900, 0x80, 0x900, IRQS_DISABLED)
++EXC_VIRT_OOL_MASKABLE(decrementer, 0x4900, 0x80, 0x900, IRQS_DISABLED)
+ TRAMP_KVM(PACA_EXGEN, 0x900)
+ EXC_COMMON_ASYNC(decrementer_common, 0x900, timer_interrupt)
+ 
+ 
+-EXC_REAL_HV(hdecrementer, 0x980, 0x80)
+-EXC_VIRT_HV(hdecrementer, 0x4980, 0x80, 0x980)
++EXC_REAL_OOL_HV(hdecrementer, 0x980, 0x80)
++EXC_VIRT_OOL_HV(hdecrementer, 0x4980, 0x80, 0x980)
+ TRAMP_KVM_HV(PACA_EXGEN, 0x980)
+ EXC_COMMON(hdecrementer_common, 0x980, hdec_interrupt)
+ 
+@@ -1523,15 +1529,8 @@ TRAMP_REAL_BEGIN(stf_barrier_fallback)
+ 	.endr
+ 	blr
+ 
+-TRAMP_REAL_BEGIN(rfi_flush_fallback)
+-	SET_SCRATCH0(r13);
+-	GET_PACA(r13);
+-	std	r1,PACA_EXRFI+EX_R12(r13)
+-	ld	r1,PACAKSAVE(r13)
+-	std	r9,PACA_EXRFI+EX_R9(r13)
+-	std	r10,PACA_EXRFI+EX_R10(r13)
+-	std	r11,PACA_EXRFI+EX_R11(r13)
+-	mfctr	r9
++/* Clobbers r10, r11, ctr */
++.macro L1D_DISPLACEMENT_FLUSH
+ 	ld	r10,PACA_RFI_FLUSH_FALLBACK_AREA(r13)
+ 	ld	r11,PACA_L1D_FLUSH_SIZE(r13)
+ 	srdi	r11,r11,(7 + 3) /* 128 byte lines, unrolled 8x */
+@@ -1542,7 +1541,7 @@ TRAMP_REAL_BEGIN(rfi_flush_fallback)
+ 	sync
+ 
+ 	/*
+-	 * The load adresses are at staggered offsets within cachelines,
++	 * The load addresses are at staggered offsets within cachelines,
+ 	 * which suits some pipelines better (on others it should not
+ 	 * hurt).
+ 	 */
+@@ -1557,7 +1556,30 @@ TRAMP_REAL_BEGIN(rfi_flush_fallback)
+ 	ld	r11,(0x80 + 8)*7(r10)
+ 	addi	r10,r10,0x80*8
+ 	bdnz	1b
++.endm
++
++TRAMP_REAL_BEGIN(entry_flush_fallback)
++	std	r9,PACA_EXRFI+EX_R9(r13)
++	std	r10,PACA_EXRFI+EX_R10(r13)
++	std	r11,PACA_EXRFI+EX_R11(r13)
++	mfctr	r9
++	L1D_DISPLACEMENT_FLUSH
++	mtctr	r9
++	ld	r9,PACA_EXRFI+EX_R9(r13)
++	ld	r10,PACA_EXRFI+EX_R10(r13)
++	ld	r11,PACA_EXRFI+EX_R11(r13)
++	blr
+ 
++TRAMP_REAL_BEGIN(rfi_flush_fallback)
++	SET_SCRATCH0(r13);
++	GET_PACA(r13);
++	std	r1,PACA_EXRFI+EX_R12(r13)
++	ld	r1,PACAKSAVE(r13)
++	std	r9,PACA_EXRFI+EX_R9(r13)
++	std	r10,PACA_EXRFI+EX_R10(r13)
++	std	r11,PACA_EXRFI+EX_R11(r13)
++	mfctr	r9
++	L1D_DISPLACEMENT_FLUSH
+ 	mtctr	r9
+ 	ld	r9,PACA_EXRFI+EX_R9(r13)
+ 	ld	r10,PACA_EXRFI+EX_R10(r13)
+@@ -1575,32 +1597,7 @@ TRAMP_REAL_BEGIN(hrfi_flush_fallback)
+ 	std	r10,PACA_EXRFI+EX_R10(r13)
+ 	std	r11,PACA_EXRFI+EX_R11(r13)
+ 	mfctr	r9
+-	ld	r10,PACA_RFI_FLUSH_FALLBACK_AREA(r13)
+-	ld	r11,PACA_L1D_FLUSH_SIZE(r13)
+-	srdi	r11,r11,(7 + 3) /* 128 byte lines, unrolled 8x */
+-	mtctr	r11
+-	DCBT_BOOK3S_STOP_ALL_STREAM_IDS(r11) /* Stop prefetch streams */
+-
+-	/* order ld/st prior to dcbt stop all streams with flushing */
+-	sync
+-
+-	/*
+-	 * The load adresses are at staggered offsets within cachelines,
+-	 * which suits some pipelines better (on others it should not
+-	 * hurt).
+-	 */
+-1:
+-	ld	r11,(0x80 + 8)*0(r10)
+-	ld	r11,(0x80 + 8)*1(r10)
+-	ld	r11,(0x80 + 8)*2(r10)
+-	ld	r11,(0x80 + 8)*3(r10)
+-	ld	r11,(0x80 + 8)*4(r10)
+-	ld	r11,(0x80 + 8)*5(r10)
+-	ld	r11,(0x80 + 8)*6(r10)
+-	ld	r11,(0x80 + 8)*7(r10)
+-	addi	r10,r10,0x80*8
+-	bdnz	1b
+-
++	L1D_DISPLACEMENT_FLUSH
+ 	mtctr	r9
+ 	ld	r9,PACA_EXRFI+EX_R9(r13)
+ 	ld	r10,PACA_EXRFI+EX_R10(r13)
+@@ -1609,6 +1606,19 @@ TRAMP_REAL_BEGIN(hrfi_flush_fallback)
+ 	GET_SCRATCH0(r13);
+ 	hrfid
+ 
++USE_TEXT_SECTION()
++
++_GLOBAL(do_uaccess_flush)
++	UACCESS_FLUSH_FIXUP_SECTION
++	nop
++	nop
++	nop
++	blr
++	L1D_DISPLACEMENT_FLUSH
++	blr
++_ASM_NOKPROBE_SYMBOL(do_uaccess_flush)
++EXPORT_SYMBOL(do_uaccess_flush)
++
+ /*
+  * Real mode exceptions actually use this too, but alternate
+  * instruction code patches (which end up in the common .text area)
+diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
+index 9fd2ff28b8ff2..dc99258f2e8c6 100644
+--- a/arch/powerpc/kernel/head_8xx.S
++++ b/arch/powerpc/kernel/head_8xx.S
+@@ -356,11 +356,9 @@ _ENTRY(ITLBMiss_cmp)
+ 	/* Load the MI_TWC with the attributes for this "segment." */
+ 	mtspr	SPRN_MI_TWC, r11	/* Set segment attributes */
+ 
+-#ifdef CONFIG_SWAP
+-	rlwinm	r11, r10, 32-5, _PAGE_PRESENT
++	rlwinm	r11, r10, 32-7, _PAGE_PRESENT
+ 	and	r11, r11, r10
+ 	rlwimi	r10, r11, 0, _PAGE_PRESENT
+-#endif
+ 	li	r11, RPN_PATTERN | 0x200
+ 	/* The Linux PTE won't go exactly into the MMU TLB.
+ 	 * Software indicator bits 20 and 23 must be clear.
+@@ -482,11 +480,9 @@ _ENTRY(DTLBMiss_jmp)
+ 	 * r11 = ((r10 & PRESENT) & ((r10 & ACCESSED) >> 5));
+ 	 * r10 = (r10 & ~PRESENT) | r11;
+ 	 */
+-#ifdef CONFIG_SWAP
+-	rlwinm	r11, r10, 32-5, _PAGE_PRESENT
++	rlwinm	r11, r10, 32-7, _PAGE_PRESENT
+ 	and	r11, r11, r10
+ 	rlwimi	r10, r11, 0, _PAGE_PRESENT
+-#endif
+ 	/* The Linux PTE won't go exactly into the MMU TLB.
+ 	 * Software indicator bits 24, 25, 26, and 27 must be
+ 	 * set.  All other Linux PTE bits control the behavior
+diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
+index bd4996958b13d..122365624d3da 100644
+--- a/arch/powerpc/kernel/setup_64.c
++++ b/arch/powerpc/kernel/setup_64.c
+@@ -863,7 +863,13 @@ early_initcall(disable_hardlockup_detector);
+ static enum l1d_flush_type enabled_flush_types;
+ static void *l1d_flush_fallback_area;
+ static bool no_rfi_flush;
++static bool no_entry_flush;
++static bool no_uaccess_flush;
+ bool rfi_flush;
++bool entry_flush;
++bool uaccess_flush;
++DEFINE_STATIC_KEY_FALSE(uaccess_flush_key);
++EXPORT_SYMBOL(uaccess_flush_key);
+ 
+ static int __init handle_no_rfi_flush(char *p)
+ {
+@@ -873,6 +879,22 @@ static int __init handle_no_rfi_flush(char *p)
+ }
+ early_param("no_rfi_flush", handle_no_rfi_flush);
+ 
++static int __init handle_no_entry_flush(char *p)
++{
++	pr_info("entry-flush: disabled on command line.");
++	no_entry_flush = true;
++	return 0;
++}
++early_param("no_entry_flush", handle_no_entry_flush);
++
++static int __init handle_no_uaccess_flush(char *p)
++{
++	pr_info("uaccess-flush: disabled on command line.");
++	no_uaccess_flush = true;
++	return 0;
++}
++early_param("no_uaccess_flush", handle_no_uaccess_flush);
++
+ /*
+  * The RFI flush is not KPTI, but because users will see doco that says to use
+  * nopti we hijack that option here to also disable the RFI flush.
+@@ -904,6 +926,32 @@ void rfi_flush_enable(bool enable)
+ 	rfi_flush = enable;
+ }
+ 
++void entry_flush_enable(bool enable)
++{
++	if (enable) {
++		do_entry_flush_fixups(enabled_flush_types);
++		on_each_cpu(do_nothing, NULL, 1);
++	} else {
++		do_entry_flush_fixups(L1D_FLUSH_NONE);
++	}
++
++	entry_flush = enable;
++}
++
++void uaccess_flush_enable(bool enable)
++{
++	if (enable) {
++		do_uaccess_flush_fixups(enabled_flush_types);
++		static_branch_enable(&uaccess_flush_key);
++		on_each_cpu(do_nothing, NULL, 1);
++	} else {
++		static_branch_disable(&uaccess_flush_key);
++		do_uaccess_flush_fixups(L1D_FLUSH_NONE);
++	}
++
++	uaccess_flush = enable;
++}
++
+ static void __ref init_fallback_flush(void)
+ {
+ 	u64 l1d_size, limit;
+@@ -957,10 +1005,28 @@ void setup_rfi_flush(enum l1d_flush_type types, bool enable)
+ 
+ 	enabled_flush_types = types;
+ 
+-	if (!no_rfi_flush && !cpu_mitigations_off())
++	if (!cpu_mitigations_off() && !no_rfi_flush)
+ 		rfi_flush_enable(enable);
+ }
+ 
++void setup_entry_flush(bool enable)
++{
++	if (cpu_mitigations_off())
++		return;
++
++	if (!no_entry_flush)
++		entry_flush_enable(enable);
++}
++
++void setup_uaccess_flush(bool enable)
++{
++	if (cpu_mitigations_off())
++		return;
++
++	if (!no_uaccess_flush)
++		uaccess_flush_enable(enable);
++}
++
+ #ifdef CONFIG_DEBUG_FS
+ static int rfi_flush_set(void *data, u64 val)
+ {
+@@ -988,9 +1054,63 @@ static int rfi_flush_get(void *data, u64 *val)
+ 
+ DEFINE_SIMPLE_ATTRIBUTE(fops_rfi_flush, rfi_flush_get, rfi_flush_set, "%llu\n");
+ 
++static int entry_flush_set(void *data, u64 val)
++{
++	bool enable;
++
++	if (val == 1)
++		enable = true;
++	else if (val == 0)
++		enable = false;
++	else
++		return -EINVAL;
++
++	/* Only do anything if we're changing state */
++	if (enable != entry_flush)
++		entry_flush_enable(enable);
++
++	return 0;
++}
++
++static int entry_flush_get(void *data, u64 *val)
++{
++	*val = entry_flush ? 1 : 0;
++	return 0;
++}
++
++DEFINE_SIMPLE_ATTRIBUTE(fops_entry_flush, entry_flush_get, entry_flush_set, "%llu\n");
++
++static int uaccess_flush_set(void *data, u64 val)
++{
++	bool enable;
++
++	if (val == 1)
++		enable = true;
++	else if (val == 0)
++		enable = false;
++	else
++		return -EINVAL;
++
++	/* Only do anything if we're changing state */
++	if (enable != uaccess_flush)
++		uaccess_flush_enable(enable);
++
++	return 0;
++}
++
++static int uaccess_flush_get(void *data, u64 *val)
++{
++	*val = uaccess_flush ? 1 : 0;
++	return 0;
++}
++
++DEFINE_SIMPLE_ATTRIBUTE(fops_uaccess_flush, uaccess_flush_get, uaccess_flush_set, "%llu\n");
++
+ static __init int rfi_flush_debugfs_init(void)
+ {
+ 	debugfs_create_file("rfi_flush", 0600, powerpc_debugfs_root, NULL, &fops_rfi_flush);
++	debugfs_create_file("entry_flush", 0600, powerpc_debugfs_root, NULL, &fops_entry_flush);
++	debugfs_create_file("uaccess_flush", 0600, powerpc_debugfs_root, NULL, &fops_uaccess_flush);
+ 	return 0;
+ }
+ device_initcall(rfi_flush_debugfs_init);
+diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S
+index d081d726ca8ea..695432965f206 100644
+--- a/arch/powerpc/kernel/vmlinux.lds.S
++++ b/arch/powerpc/kernel/vmlinux.lds.S
+@@ -140,6 +140,20 @@ SECTIONS
+ 		__stop___stf_entry_barrier_fixup = .;
+ 	}
+ 
++	. = ALIGN(8);
++	__uaccess_flush_fixup : AT(ADDR(__uaccess_flush_fixup) - LOAD_OFFSET) {
++		__start___uaccess_flush_fixup = .;
++		*(__uaccess_flush_fixup)
++		__stop___uaccess_flush_fixup = .;
++	}
++
++	. = ALIGN(8);
++	__entry_flush_fixup : AT(ADDR(__entry_flush_fixup) - LOAD_OFFSET) {
++		__start___entry_flush_fixup = .;
++		*(__entry_flush_fixup)
++		__stop___entry_flush_fixup = .;
++	}
++
+ 	. = ALIGN(8);
+ 	__stf_exit_barrier_fixup : AT(ADDR(__stf_exit_barrier_fixup) - LOAD_OFFSET) {
+ 		__start___stf_exit_barrier_fixup = .;
+diff --git a/arch/powerpc/lib/checksum_wrappers.c b/arch/powerpc/lib/checksum_wrappers.c
+index a0cb63fb76a1a..8d83c39be7e49 100644
+--- a/arch/powerpc/lib/checksum_wrappers.c
++++ b/arch/powerpc/lib/checksum_wrappers.c
+@@ -29,6 +29,7 @@ __wsum csum_and_copy_from_user(const void __user *src, void *dst,
+ 	unsigned int csum;
+ 
+ 	might_sleep();
++	allow_read_from_user(src, len);
+ 
+ 	*err_ptr = 0;
+ 
+@@ -60,6 +61,7 @@ __wsum csum_and_copy_from_user(const void __user *src, void *dst,
+ 	}
+ 
+ out:
++	prevent_read_from_user(src, len);
+ 	return (__force __wsum)csum;
+ }
+ EXPORT_SYMBOL(csum_and_copy_from_user);
+@@ -70,6 +72,7 @@ __wsum csum_and_copy_to_user(const void *src, void __user *dst, int len,
+ 	unsigned int csum;
+ 
+ 	might_sleep();
++	allow_write_to_user(dst, len);
+ 
+ 	*err_ptr = 0;
+ 
+@@ -97,6 +100,7 @@ __wsum csum_and_copy_to_user(const void *src, void __user *dst, int len,
+ 	}
+ 
+ out:
++	prevent_write_to_user(dst, len);
+ 	return (__force __wsum)csum;
+ }
+ EXPORT_SYMBOL(csum_and_copy_to_user);
+diff --git a/arch/powerpc/lib/feature-fixups.c b/arch/powerpc/lib/feature-fixups.c
+index dbe478e7b8e09..065a3426f0ebc 100644
+--- a/arch/powerpc/lib/feature-fixups.c
++++ b/arch/powerpc/lib/feature-fixups.c
+@@ -232,6 +232,110 @@ void do_stf_barrier_fixups(enum stf_barrier_type types)
+ 	do_stf_exit_barrier_fixups(types);
+ }
+ 
++void do_uaccess_flush_fixups(enum l1d_flush_type types)
++{
++	unsigned int instrs[4], *dest;
++	long *start, *end;
++	int i;
++
++	start = PTRRELOC(&__start___uaccess_flush_fixup);
++	end = PTRRELOC(&__stop___uaccess_flush_fixup);
++
++	instrs[0] = 0x60000000; /* nop */
++	instrs[1] = 0x60000000; /* nop */
++	instrs[2] = 0x60000000; /* nop */
++	instrs[3] = 0x4e800020; /* blr */
++
++	i = 0;
++	if (types == L1D_FLUSH_FALLBACK) {
++		instrs[3] = 0x60000000; /* nop */
++		/* fallthrough to fallback flush */
++	}
++
++	if (types & L1D_FLUSH_ORI) {
++		instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */
++		instrs[i++] = 0x63de0000; /* ori 30,30,0 L1d flush*/
++	}
++
++	if (types & L1D_FLUSH_MTTRIG)
++		instrs[i++] = 0x7c12dba6; /* mtspr TRIG2,r0 (SPR #882) */
++
++	for (i = 0; start < end; start++, i++) {
++		dest = (void *)start + *start;
++
++		pr_devel("patching dest %lx\n", (unsigned long)dest);
++
++		patch_instruction(dest, instrs[0]);
++
++		patch_instruction((dest + 1), instrs[1]);
++		patch_instruction((dest + 2), instrs[2]);
++		patch_instruction((dest + 3), instrs[3]);
++	}
++
++	printk(KERN_DEBUG "uaccess-flush: patched %d locations (%s flush)\n", i,
++		(types == L1D_FLUSH_NONE)       ? "no" :
++		(types == L1D_FLUSH_FALLBACK)   ? "fallback displacement" :
++		(types &  L1D_FLUSH_ORI)        ? (types & L1D_FLUSH_MTTRIG)
++							? "ori+mttrig type"
++							: "ori type" :
++		(types &  L1D_FLUSH_MTTRIG)     ? "mttrig type"
++						: "unknown");
++}
++
++void do_entry_flush_fixups(enum l1d_flush_type types)
++{
++	unsigned int instrs[3], *dest;
++	long *start, *end;
++	int i;
++
++	start = PTRRELOC(&__start___entry_flush_fixup);
++	end = PTRRELOC(&__stop___entry_flush_fixup);
++
++	instrs[0] = 0x60000000; /* nop */
++	instrs[1] = 0x60000000; /* nop */
++	instrs[2] = 0x60000000; /* nop */
++
++	i = 0;
++	if (types == L1D_FLUSH_FALLBACK) {
++		instrs[i++] = 0x7d4802a6; /* mflr r10		*/
++		instrs[i++] = 0x60000000; /* branch patched below */
++		instrs[i++] = 0x7d4803a6; /* mtlr r10		*/
++	}
++
++	if (types & L1D_FLUSH_ORI) {
++		instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */
++		instrs[i++] = 0x63de0000; /* ori 30,30,0 L1d flush*/
++	}
++
++	if (types & L1D_FLUSH_MTTRIG)
++		instrs[i++] = 0x7c12dba6; /* mtspr TRIG2,r0 (SPR #882) */
++
++	for (i = 0; start < end; start++, i++) {
++		dest = (void *)start + *start;
++
++		pr_devel("patching dest %lx\n", (unsigned long)dest);
++
++		patch_instruction(dest, instrs[0]);
++
++		if (types == L1D_FLUSH_FALLBACK)
++			patch_branch((dest + 1), (unsigned long)&entry_flush_fallback,
++				     BRANCH_SET_LINK);
++		else
++			patch_instruction((dest + 1), instrs[1]);
++
++		patch_instruction((dest + 2), instrs[2]);
++	}
++
++	printk(KERN_DEBUG "entry-flush: patched %d locations (%s flush)\n", i,
++		(types == L1D_FLUSH_NONE)       ? "no" :
++		(types == L1D_FLUSH_FALLBACK)   ? "fallback displacement" :
++		(types &  L1D_FLUSH_ORI)        ? (types & L1D_FLUSH_MTTRIG)
++							? "ori+mttrig type"
++							: "ori type" :
++		(types &  L1D_FLUSH_MTTRIG)     ? "mttrig type"
++						: "unknown");
++}
++
+ void do_rfi_flush_fixups(enum l1d_flush_type types)
+ {
+ 	unsigned int instrs[3], *dest;
+diff --git a/arch/powerpc/lib/string_32.S b/arch/powerpc/lib/string_32.S
+index f69a6aab7bfbb..1ddb26394e8ac 100644
+--- a/arch/powerpc/lib/string_32.S
++++ b/arch/powerpc/lib/string_32.S
+@@ -17,7 +17,7 @@ CACHELINE_BYTES = L1_CACHE_BYTES
+ LG_CACHELINE_BYTES = L1_CACHE_SHIFT
+ CACHELINE_MASK = (L1_CACHE_BYTES-1)
+ 
+-_GLOBAL(__clear_user)
++_GLOBAL(__arch_clear_user)
+ /*
+  * Use dcbz on the complete cache lines in the destination
+  * to set them to zero.  This requires that the destination
+@@ -87,4 +87,4 @@ _GLOBAL(__clear_user)
+ 	EX_TABLE(8b, 91b)
+ 	EX_TABLE(9b, 91b)
+ 
+-EXPORT_SYMBOL(__clear_user)
++EXPORT_SYMBOL(__arch_clear_user)
+diff --git a/arch/powerpc/lib/string_64.S b/arch/powerpc/lib/string_64.S
+index 56aac4c220257..ea3798f4f25f2 100644
+--- a/arch/powerpc/lib/string_64.S
++++ b/arch/powerpc/lib/string_64.S
+@@ -29,7 +29,7 @@ PPC64_CACHES:
+ 	.section	".text"
+ 
+ /**
+- * __clear_user: - Zero a block of memory in user space, with less checking.
++ * __arch_clear_user: - Zero a block of memory in user space, with less checking.
+  * @to:   Destination address, in user space.
+  * @n:    Number of bytes to zero.
+  *
+@@ -70,7 +70,7 @@ err3;	stb	r0,0(r3)
+ 	mr	r3,r4
+ 	blr
+ 
+-_GLOBAL_TOC(__clear_user)
++_GLOBAL_TOC(__arch_clear_user)
+ 	cmpdi	r4,32
+ 	neg	r6,r3
+ 	li	r0,0
+@@ -193,4 +193,4 @@ err1;	dcbz	0,r3
+ 	cmpdi	r4,32
+ 	blt	.Lshort_clear
+ 	b	.Lmedium_clear
+-EXPORT_SYMBOL(__clear_user)
++EXPORT_SYMBOL(__arch_clear_user)
+diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c
+index adddde0236227..5068dd7f6e74b 100644
+--- a/arch/powerpc/platforms/powernv/setup.c
++++ b/arch/powerpc/platforms/powernv/setup.c
+@@ -125,12 +125,29 @@ static void pnv_setup_rfi_flush(void)
+ 			type = L1D_FLUSH_ORI;
+ 	}
+ 
++	/*
++	 * If we are non-Power9 bare metal, we don't need to flush on kernel
++	 * entry or after user access: they fix a P9 specific vulnerability.
++	 */
++	if (!pvr_version_is(PVR_POWER9)) {
++		security_ftr_clear(SEC_FTR_L1D_FLUSH_ENTRY);
++		security_ftr_clear(SEC_FTR_L1D_FLUSH_UACCESS);
++	}
++
+ 	enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) && \
+ 		 (security_ftr_enabled(SEC_FTR_L1D_FLUSH_PR)   || \
+ 		  security_ftr_enabled(SEC_FTR_L1D_FLUSH_HV));
+ 
+ 	setup_rfi_flush(type, enable);
+ 	setup_count_cache_flush();
++
++	enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&
++		 security_ftr_enabled(SEC_FTR_L1D_FLUSH_ENTRY);
++	setup_entry_flush(enable);
++
++	enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&
++		 security_ftr_enabled(SEC_FTR_L1D_FLUSH_UACCESS);
++	setup_uaccess_flush(enable);
+ }
+ 
+ static void __init pnv_setup_arch(void)
+diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
+index c2d318d1df021..2e0d38cafdd44 100644
+--- a/arch/powerpc/platforms/pseries/setup.c
++++ b/arch/powerpc/platforms/pseries/setup.c
+@@ -565,6 +565,14 @@ void pseries_setup_rfi_flush(void)
+ 
+ 	setup_rfi_flush(types, enable);
+ 	setup_count_cache_flush();
++
++	enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&
++		 security_ftr_enabled(SEC_FTR_L1D_FLUSH_ENTRY);
++	setup_entry_flush(enable);
++
++	enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&
++		 security_ftr_enabled(SEC_FTR_L1D_FLUSH_UACCESS);
++	setup_uaccess_flush(enable);
+ }
+ 
+ #ifdef CONFIG_PCI_IOV
+diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
+index 670c2aedcefab..3e182c7ae7714 100644
+--- a/arch/x86/kvm/emulate.c
++++ b/arch/x86/kvm/emulate.c
+@@ -3994,6 +3994,12 @@ static int em_clflush(struct x86_emulate_ctxt *ctxt)
+ 	return X86EMUL_CONTINUE;
+ }
+ 
++static int em_clflushopt(struct x86_emulate_ctxt *ctxt)
++{
++	/* emulating clflushopt regardless of cpuid */
++	return X86EMUL_CONTINUE;
++}
++
+ static int em_movsxd(struct x86_emulate_ctxt *ctxt)
+ {
+ 	ctxt->dst.val = (s32) ctxt->src.val;
+@@ -4507,7 +4513,7 @@ static const struct opcode group11[] = {
+ };
+ 
+ static const struct gprefix pfx_0f_ae_7 = {
+-	I(SrcMem | ByteOp, em_clflush), N, N, N,
++	I(SrcMem | ByteOp, em_clflush), I(SrcMem | ByteOp, em_clflushopt), N, N,
+ };
+ 
+ static const struct group_dual group15 = { {
+diff --git a/drivers/acpi/evged.c b/drivers/acpi/evged.c
+index 73f6093a5c16d..9f4b405a5c20b 100644
+--- a/drivers/acpi/evged.c
++++ b/drivers/acpi/evged.c
+@@ -110,7 +110,7 @@ static acpi_status acpi_ged_request_interrupt(struct acpi_resource *ares,
+ 
+ 	switch (gsi) {
+ 	case 0 ... 255:
+-		sprintf(ev_name, "_%c%02hhX",
++		sprintf(ev_name, "_%c%02X",
+ 			trigger == ACPI_EDGE_SENSITIVE ? 'E' : 'L', gsi);
+ 
+ 		if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle)))
+diff --git a/drivers/input/keyboard/sunkbd.c b/drivers/input/keyboard/sunkbd.c
+index ad5d7f94f95a6..1c7aa86c92ab1 100644
+--- a/drivers/input/keyboard/sunkbd.c
++++ b/drivers/input/keyboard/sunkbd.c
+@@ -111,7 +111,8 @@ static irqreturn_t sunkbd_interrupt(struct serio *serio,
+ 	switch (data) {
+ 
+ 	case SUNKBD_RET_RESET:
+-		schedule_work(&sunkbd->tq);
++		if (sunkbd->enabled)
++			schedule_work(&sunkbd->tq);
+ 		sunkbd->reset = -1;
+ 		break;
+ 
+@@ -212,16 +213,12 @@ static int sunkbd_initialize(struct sunkbd *sunkbd)
+ }
+ 
+ /*
+- * sunkbd_reinit() sets leds and beeps to a state the computer remembers they
+- * were in.
++ * sunkbd_set_leds_beeps() sets leds and beeps to a state the computer remembers
++ * they were in.
+  */
+ 
+-static void sunkbd_reinit(struct work_struct *work)
++static void sunkbd_set_leds_beeps(struct sunkbd *sunkbd)
+ {
+-	struct sunkbd *sunkbd = container_of(work, struct sunkbd, tq);
+-
+-	wait_event_interruptible_timeout(sunkbd->wait, sunkbd->reset >= 0, HZ);
+-
+ 	serio_write(sunkbd->serio, SUNKBD_CMD_SETLED);
+ 	serio_write(sunkbd->serio,
+ 		(!!test_bit(LED_CAPSL,   sunkbd->dev->led) << 3) |
+@@ -234,11 +231,39 @@ static void sunkbd_reinit(struct work_struct *work)
+ 		SUNKBD_CMD_BELLOFF - !!test_bit(SND_BELL, sunkbd->dev->snd));
+ }
+ 
++
++/*
++ * sunkbd_reinit() wait for the keyboard reset to complete and restores state
++ * of leds and beeps.
++ */
++
++static void sunkbd_reinit(struct work_struct *work)
++{
++	struct sunkbd *sunkbd = container_of(work, struct sunkbd, tq);
++
++	/*
++	 * It is OK that we check sunkbd->enabled without pausing serio,
++	 * as we only want to catch true->false transition that will
++	 * happen once and we will be woken up for it.
++	 */
++	wait_event_interruptible_timeout(sunkbd->wait,
++					 sunkbd->reset >= 0 || !sunkbd->enabled,
++					 HZ);
++
++	if (sunkbd->reset >= 0 && sunkbd->enabled)
++		sunkbd_set_leds_beeps(sunkbd);
++}
++
+ static void sunkbd_enable(struct sunkbd *sunkbd, bool enable)
+ {
+ 	serio_pause_rx(sunkbd->serio);
+ 	sunkbd->enabled = enable;
+ 	serio_continue_rx(sunkbd->serio);
++
++	if (!enable) {
++		wake_up_interruptible(&sunkbd->wait);
++		cancel_work_sync(&sunkbd->tq);
++	}
+ }
+ 
+ /*
+diff --git a/net/can/proc.c b/net/can/proc.c
+index 70fea17bb04c5..a3071f43acd76 100644
+--- a/net/can/proc.c
++++ b/net/can/proc.c
+@@ -467,6 +467,9 @@ void can_init_proc(struct net *net)
+  */
+ void can_remove_proc(struct net *net)
+ {
++	if (!net->can.proc_dir)
++		return;
++
+ 	if (net->can.pde_version)
+ 		remove_proc_entry(CAN_PROC_VERSION, net->can.proc_dir);
+ 
+@@ -494,6 +497,5 @@ void can_remove_proc(struct net *net)
+ 	if (net->can.pde_rcvlist_sff)
+ 		remove_proc_entry(CAN_PROC_RCVLIST_SFF, net->can.proc_dir);
+ 
+-	if (net->can.proc_dir)
+-		remove_proc_entry("can", net->proc_net);
++	remove_proc_entry("can", net->proc_net);
+ }
+diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
+index 9968b8a976f19..d11eb5139c92a 100644
+--- a/net/mac80211/sta_info.c
++++ b/net/mac80211/sta_info.c
+@@ -244,6 +244,24 @@ struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
+  */
+ void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
+ {
++	/*
++	 * If we had used sta_info_pre_move_state() then we might not
++	 * have gone through the state transitions down again, so do
++	 * it here now (and warn if it's inserted).
++	 *
++	 * This will clear state such as fast TX/RX that may have been
++	 * allocated during state transitions.
++	 */
++	while (sta->sta_state > IEEE80211_STA_NONE) {
++		int ret;
++
++		WARN_ON_ONCE(test_sta_flag(sta, WLAN_STA_INSERTED));
++
++		ret = sta_info_move_state(sta, sta->sta_state - 1);
++		if (WARN_ONCE(ret, "sta_info_move_state() returned %d\n", ret))
++			break;
++	}
++
+ 	if (sta->rate_ctrl)
+ 		rate_control_free_sta(sta);
+ 
+diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
+index ad33b99f5d21e..7b5e15cc6b717 100644
+--- a/tools/perf/util/cs-etm.c
++++ b/tools/perf/util/cs-etm.c
+@@ -87,9 +87,6 @@ struct cs_etm_queue {
+ 	struct cs_etm_packet *packet;
+ };
+ 
+-/* RB tree for quick conversion between traceID and metadata pointers */
+-static struct intlist *traceid_list;
+-
+ static int cs_etm__update_queues(struct cs_etm_auxtrace *etm);
+ static int cs_etm__process_timeless_queues(struct cs_etm_auxtrace *etm,
+ 					   pid_t tid, u64 time_);
+diff --git a/tools/perf/util/cs-etm.h b/tools/perf/util/cs-etm.h
+index c7ef97b198c77..37f8d48179cae 100644
+--- a/tools/perf/util/cs-etm.h
++++ b/tools/perf/util/cs-etm.h
+@@ -53,6 +53,9 @@ enum {
+ 	CS_ETMV4_PRIV_MAX,
+ };
+ 
++/* RB tree for quick conversion between traceID and CPUs */
++struct intlist *traceid_list;
++
+ #define KiB(x) ((x) * 1024)
+ #define MiB(x) ((x) * 1024 * 1024)
+ 


             reply	other threads:[~2020-11-22 19:26 UTC|newest]

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