1 files changed, 21 insertions, 11 deletions

diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index af0d3f7..f21b41e 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;