4 files changed, 25 insertions, 6 deletions

diff --git a/arch/arm64/kernel/arm64ksyms.c b/arch/arm64/kernel/arm64ksyms.c
index 7df1aad29b67..41b4f626d554 100644
--- a/arch/arm64/kernel/arm64ksyms.c
+++ b/arch/arm64/kernel/arm64ksyms.c
@@ -34,6 +34,7 @@ EXPORT_SYMBOL(__strnlen_user);
 EXPORT_SYMBOL(__strncpy_from_user);
 
 EXPORT_SYMBOL(copy_page);
+EXPORT_SYMBOL(clear_page);
 
 EXPORT_SYMBOL(__copy_from_user);
 EXPORT_SYMBOL(__copy_to_user);
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index c7e047049f2c..1d1314280a03 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -390,6 +390,16 @@ el0_sync_compat:
         b.eq    el0_fpsimd_exc
         cmp     x24, #ESR_EL1_EC_UNKNOWN        // unknown exception in EL0
         b.eq    el0_undef
+        cmp     x24, #ESR_EL1_EC_CP15_32        // CP15 MRC/MCR trap
+        b.eq    el0_undef
+        cmp     x24, #ESR_EL1_EC_CP15_64        // CP15 MRRC/MCRR trap
+        b.eq    el0_undef
+        cmp     x24, #ESR_EL1_EC_CP14_MR        // CP14 MRC/MCR trap
+        b.eq    el0_undef
+        cmp     x24, #ESR_EL1_EC_CP14_LS        // CP14 LDC/STC trap
+        b.eq    el0_undef
+        cmp     x24, #ESR_EL1_EC_CP14_64        // CP14 MRRC/MCRR trap
+        b.eq    el0_undef
         cmp     x24, #ESR_EL1_EC_BREAKPT_EL0    // debug exception in EL0
         b.ge    el0_dbg
         b       el0_inv
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index 61d7dd29f756..f30852d28590 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -267,7 +267,8 @@ asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
                 return;
 #endif
 
-        if (show_unhandled_signals) {
+        if (show_unhandled_signals && unhandled_signal(current, SIGILL) &&
+            printk_ratelimit()) {
                 pr_info("%s[%d]: undefined instruction: pc=%p\n",
                         current->comm, task_pid_nr(current), pc);
                 dump_instr(KERN_INFO, regs);
@@ -294,7 +295,7 @@ asmlinkage long do_ni_syscall(struct pt_regs *regs)
         }
 #endif
 
-        if (show_unhandled_signals) {
+        if (show_unhandled_signals && printk_ratelimit()) {
                 pr_info("%s[%d]: syscall %d\n", current->comm,
                         task_pid_nr(current), (int)regs->syscallno);
                 dump_instr("", regs);
@@ -310,14 +311,20 @@ asmlinkage long do_ni_syscall(struct pt_regs *regs)
  */
 asmlinkage void bad_mode(struct pt_regs *regs, int reason, unsigned int esr)
 {
+        siginfo_t info;
+        void __user *pc = (void __user *)instruction_pointer(regs);
         console_verbose();
 
         pr_crit("Bad mode in %s handler detected, code 0x%08x\n",
                 handler[reason], esr);
+        __show_regs(regs);
+
+        info.si_signo = SIGILL;
+        info.si_errno = 0;
+        info.si_code  = ILL_ILLOPC;
+        info.si_addr  = pc;
 
-        die("Oops - bad mode", regs, 0);
-        local_irq_disable();
-        panic("bad mode");
+        arm64_notify_die("Oops - bad mode", regs, &info, 0);
 }
 
 void __pte_error(const char *file, int line, unsigned long val)
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 98af6e760cce..1426468b77f3 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -113,7 +113,8 @@ static void __do_user_fault(struct task_struct *tsk, unsigned long addr,
 {
         struct siginfo si;
 
-        if (show_unhandled_signals) {
+        if (show_unhandled_signals && unhandled_signal(tsk, sig) &&
+            printk_ratelimit()) {
                 pr_info("%s[%d]: unhandled %s (%d) at 0x%08lx, esr 0x%03x\n",
                         tsk->comm, task_pid_nr(tsk), fault_name(esr), sig,
                         addr, esr);