3 files changed, 38 insertions, 5 deletions

diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 2d23ad985180..8bfa98757cd2 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -334,7 +334,6 @@ ENTRY(vector_swi)
 
         get_thread_info tsk
         adr     tbl, sys_call_table             @ load syscall table pointer
-        ldr     ip, [tsk, #TI_FLAGS]            @ check for syscall tracing
 
 #if defined(CONFIG_OABI_COMPAT)
         /*
@@ -351,8 +350,20 @@ ENTRY(vector_swi)
         eor     scno, scno, #__NR_SYSCALL_BASE  @ check OS number
 #endif
 
+        ldr     r10, [tsk, #TI_FLAGS]           @ check for syscall tracing
         stmdb   sp!, {r4, r5}                   @ push fifth and sixth args
-        tst     ip, #_TIF_SYSCALL_TRACE         @ are we tracing syscalls?
+
+#ifdef CONFIG_SECCOMP
+        tst     r10, #_TIF_SECCOMP
+        beq     1f
+        mov     r0, scno
+        bl      __secure_computing      
+        add     r0, sp, #S_R0 + S_OFF           @ pointer to regs
+        ldmia   r0, {r0 - r3}                   @ have to reload r0 - r3
+1:
+#endif
+
+        tst     r10, #_TIF_SYSCALL_TRACE                @ are we tracing syscalls?
         bne     __sys_trace
 
         cmp     scno, #NR_syscalls              @ check upper syscall limit
diff --git a/arch/arm/kernel/kprobes-decode.c b/arch/arm/kernel/kprobes-decode.c
index 8bccbfa693ff..2c1f0050c9c4 100644
--- a/arch/arm/kernel/kprobes-decode.c
+++ b/arch/arm/kernel/kprobes-decode.c
@@ -1162,11 +1162,12 @@ space_cccc_001x(kprobe_opcode_t insn, struct arch_specific_insn *asi)
 {
         /*
          * MSR   : cccc 0011 0x10 xxxx xxxx xxxx xxxx xxxx
-         * Undef : cccc 0011 0x00 xxxx xxxx xxxx xxxx xxxx
+         * Undef : cccc 0011 0100 xxxx xxxx xxxx xxxx xxxx
          * ALU op with S bit and Rd == 15 :
          *         cccc 001x xxx1 xxxx 1111 xxxx xxxx xxxx
          */
-        if ((insn & 0x0f900000) == 0x03200000 ||        /* MSR & Undef */
+        if ((insn & 0x0fb00000) == 0x03200000 ||        /* MSR */
+            (insn & 0x0ff00000) == 0x03400000 ||        /* Undef */
             (insn & 0x0e10f000) == 0x0210f000)          /* ALU s-bit, R15  */
                 return INSN_REJECTED;
 
@@ -1177,7 +1178,7 @@ space_cccc_001x(kprobe_opcode_t insn, struct arch_specific_insn *asi)
          * *S (bit 20) updates condition codes
          * ADC/SBC/RSC reads the C flag
          */
-        insn &= 0xfff00fff;     /* Rn = r0, Rd = r0 */
+        insn &= 0xffff0fff;     /* Rd = r0 */
         asi->insn[0] = insn;
         asi->insn_handler = (insn & (1 << 20)) ?  /* S-bit */
                         emulate_alu_imm_rwflags : emulate_alu_imm_rflags;
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 3af34bf4f4df..e76fcaadce03 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -482,3 +482,24 @@ unsigned long arch_randomize_brk(struct mm_struct *mm)
         unsigned long range_end = mm->brk + 0x02000000;
         return randomize_range(mm->brk, range_end, 0) ? : mm->brk;
 }
+
+/*
+ * The vectors page is always readable from user space for the
+ * atomic helpers and the signal restart code.  Let's declare a mapping
+ * for it so it is visible through ptrace and /proc/<pid>/mem.
+ */
+
+int vectors_user_mapping(void)
+{
+        struct mm_struct *mm = current->mm;
+        return install_special_mapping(mm, 0xffff0000, PAGE_SIZE,
+                                       VM_READ | VM_EXEC |
+                                       VM_MAYREAD | VM_MAYEXEC |
+                                       VM_ALWAYSDUMP | VM_RESERVED,
+                                       NULL);
+}
+
+const char *arch_vma_name(struct vm_area_struct *vma)
+{
+        return (vma->vm_start == 0xffff0000) ? "[vectors]" : NULL;
+}