4 files changed, 30 insertions, 6 deletions

diff --git a/arch/arm/include/asm/unistd.h b/arch/arm/include/asm/unistd.h
index 32640c431a08..7cba573c2cc9 100644
--- a/arch/arm/include/asm/unistd.h
+++ b/arch/arm/include/asm/unistd.h
@@ -19,7 +19,7 @@
  * This may need to be greater than __NR_last_syscall+1 in order to
  * account for the padding in the syscall table
  */
-#define __NR_syscalls  (388)
+#define __NR_syscalls  (392)
 
 /*
  * *NOTE*: This is a ghost syscall private to the kernel.  Only the
diff --git a/arch/arm/include/uapi/asm/unistd.h b/arch/arm/include/uapi/asm/unistd.h
index 0c3f5a0dafd3..7a2a32a1d5a8 100644
--- a/arch/arm/include/uapi/asm/unistd.h
+++ b/arch/arm/include/uapi/asm/unistd.h
@@ -414,6 +414,8 @@
 #define __NR_memfd_create               (__NR_SYSCALL_BASE+385)
 #define __NR_bpf                        (__NR_SYSCALL_BASE+386)
 #define __NR_execveat                   (__NR_SYSCALL_BASE+387)
+#define __NR_userfaultfd                (__NR_SYSCALL_BASE+388)
+#define __NR_membarrier                 (__NR_SYSCALL_BASE+389)
 
 /*
  * The following SWIs are ARM private.
diff --git a/arch/arm/kernel/calls.S b/arch/arm/kernel/calls.S
index 05745eb838c5..fde6c88d560c 100644
--- a/arch/arm/kernel/calls.S
+++ b/arch/arm/kernel/calls.S
@@ -397,6 +397,8 @@
 /* 385 */       CALL(sys_memfd_create)
                 CALL(sys_bpf)
                 CALL(sys_execveat)
+                CALL(sys_userfaultfd)
+                CALL(sys_membarrier)
 #ifndef syscalls_counted
 .equ syscalls_padding, ((NR_syscalls + 3) & ~3) - NR_syscalls
 #define syscalls_counted
diff --git a/arch/arm/mm/alignment.c b/arch/arm/mm/alignment.c
index 9769f1eefe3b..00b7f7de28a1 100644
--- a/arch/arm/mm/alignment.c
+++ b/arch/arm/mm/alignment.c
@@ -365,15 +365,21 @@ do_alignment_ldrhstrh(unsigned long addr, unsigned long instr, struct pt_regs *r
  user:
         if (LDST_L_BIT(instr)) {
                 unsigned long val;
+                unsigned int __ua_flags = uaccess_save_and_enable();
+
                 get16t_unaligned_check(val, addr);
+                uaccess_restore(__ua_flags);
 
                 /* signed half-word? */
                 if (instr & 0x40)
                         val = (signed long)((signed short) val);
 
                 regs->uregs[rd] = val;
-        } else
+        } else {
+                unsigned int __ua_flags = uaccess_save_and_enable();
                 put16t_unaligned_check(regs->uregs[rd], addr);
+                uaccess_restore(__ua_flags);
+        }
 
         return TYPE_LDST;
 
@@ -420,14 +426,21 @@ do_alignment_ldrdstrd(unsigned long addr, unsigned long instr,
 
  user:
         if (load) {
-                unsigned long val;
+                unsigned long val, val2;
+                unsigned int __ua_flags = uaccess_save_and_enable();
+
                 get32t_unaligned_check(val, addr);
+                get32t_unaligned_check(val2, addr + 4);
+
+                uaccess_restore(__ua_flags);
+
                 regs->uregs[rd] = val;
-                get32t_unaligned_check(val, addr + 4);
-                regs->uregs[rd2] = val;
+                regs->uregs[rd2] = val2;
         } else {
+                unsigned int __ua_flags = uaccess_save_and_enable();
                 put32t_unaligned_check(regs->uregs[rd], addr);
                 put32t_unaligned_check(regs->uregs[rd2], addr + 4);
+                uaccess_restore(__ua_flags);
         }
 
         return TYPE_LDST;
@@ -458,10 +471,15 @@ do_alignment_ldrstr(unsigned long addr, unsigned long instr, struct pt_regs *reg
  trans:
         if (LDST_L_BIT(instr)) {
                 unsigned int val;
+                unsigned int __ua_flags = uaccess_save_and_enable();
                 get32t_unaligned_check(val, addr);
+                uaccess_restore(__ua_flags);
                 regs->uregs[rd] = val;
-        } else
+        } else {
+                unsigned int __ua_flags = uaccess_save_and_enable();
                 put32t_unaligned_check(regs->uregs[rd], addr);
+                uaccess_restore(__ua_flags);
+        }
         return TYPE_LDST;
 
  fault:
@@ -531,6 +549,7 @@ do_alignment_ldmstm(unsigned long addr, unsigned long instr, struct pt_regs *reg
 #endif
 
         if (user_mode(regs)) {
+                unsigned int __ua_flags = uaccess_save_and_enable();
                 for (regbits = REGMASK_BITS(instr), rd = 0; regbits;
                      regbits >>= 1, rd += 1)
                         if (regbits & 1) {
@@ -542,6 +561,7 @@ do_alignment_ldmstm(unsigned long addr, unsigned long instr, struct pt_regs *reg
                                         put32t_unaligned_check(regs->uregs[rd], eaddr);
                                 eaddr += 4;
                         }
+                uaccess_restore(__ua_flags);
         } else {
                 for (regbits = REGMASK_BITS(instr), rd = 0; regbits;
                      regbits >>= 1, rd += 1)