1 files changed, 21 insertions, 11 deletions

diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index af0d3f70a81..f21b41e7770 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -476,8 +476,6 @@ static void __kprobes do_trap(int trapnr, int signr, char *str, int vm86,
                               siginfo_t *info)
 {
         struct task_struct *tsk = current;
-        tsk->thread.error_code = error_code;
-        tsk->thread.trap_no = trapnr;
 
         if (regs->eflags & VM_MASK) {
                 if (vm86)
@@ -489,6 +487,18 @@ static void __kprobes do_trap(int trapnr, int signr, char *str, int vm86,
                 goto kernel_trap;
 
         trap_signal: {
+                /*
+                 * We want error_code and trap_no set for userspace faults and
+                 * kernelspace faults which result in die(), but not
+                 * kernelspace faults which are fixed up.  die() gives the
+                 * process no chance to handle the signal and notice the
+                 * kernel fault information, so that won't result in polluting
+                 * the information about previously queued, but not yet
+                 * delivered, faults.  See also do_general_protection below.
+                 */
+                tsk->thread.error_code = error_code;
+                tsk->thread.trap_no = trapnr;
+
                 if (info)
                         force_sig_info(signr, info, tsk);
                 else
@@ -497,8 +507,11 @@ static void __kprobes do_trap(int trapnr, int signr, char *str, int vm86,
         }
 
         kernel_trap: {
-                if (!fixup_exception(regs))
+                if (!fixup_exception(regs)) {
+                        tsk->thread.error_code = error_code;
+                        tsk->thread.trap_no = trapnr;
                         die(str, regs, error_code);
+                }
                 return;
         }
 
@@ -583,7 +596,7 @@ fastcall void __kprobes do_general_protection(struct pt_regs * regs,
          * and we set the offset field correctly. Then we let the CPU to
          * restart the faulting instruction.
          */
-        if (tss->io_bitmap_base == INVALID_IO_BITMAP_OFFSET_LAZY &&
+        if (tss->x86_tss.io_bitmap_base == INVALID_IO_BITMAP_OFFSET_LAZY &&
             thread->io_bitmap_ptr) {
                 memcpy(tss->io_bitmap, thread->io_bitmap_ptr,
                        thread->io_bitmap_max);
@@ -596,16 +609,13 @@ fastcall void __kprobes do_general_protection(struct pt_regs * regs,
                                 thread->io_bitmap_max, 0xff,
                                 tss->io_bitmap_max - thread->io_bitmap_max);
                 tss->io_bitmap_max = thread->io_bitmap_max;
-                tss->io_bitmap_base = IO_BITMAP_OFFSET;
+                tss->x86_tss.io_bitmap_base = IO_BITMAP_OFFSET;
                 tss->io_bitmap_owner = thread;
                 put_cpu();
                 return;
         }
         put_cpu();
 
-        current->thread.error_code = error_code;
-        current->thread.trap_no = 13;
-
         if (regs->eflags & VM_MASK)
                 goto gp_in_vm86;
 
@@ -624,6 +634,8 @@ gp_in_vm86:
 
 gp_in_kernel:
         if (!fixup_exception(regs)) {
+                current->thread.error_code = error_code;
+                current->thread.trap_no = 13;
                 if (notify_die(DIE_GPF, "general protection fault", regs,
                                 error_code, 13, SIGSEGV) == NOTIFY_STOP)
                         return;
@@ -1018,9 +1030,7 @@ fastcall void do_spurious_interrupt_bug(struct pt_regs * regs,
 fastcall unsigned long patch_espfix_desc(unsigned long uesp,
                                           unsigned long kesp)
 {
-        int cpu = smp_processor_id();
-        struct Xgt_desc_struct *cpu_gdt_descr = &per_cpu(cpu_gdt_descr, cpu);
-        struct desc_struct *gdt = (struct desc_struct *)cpu_gdt_descr->address;
+        struct desc_struct *gdt = __get_cpu_var(gdt_page).gdt;
         unsigned long base = (kesp - uesp) & -THREAD_SIZE;
         unsigned long new_kesp = kesp - base;
         unsigned long lim_pages = (new_kesp | (THREAD_SIZE - 1)) >> PAGE_SHIFT;