Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/i386/kernel/traps.c   |   24 ++++++++++++++++++------
 arch/x86_64/kernel/traps.c |   30 +++++++++++++++++++++++-------
 2 files changed, 41 insertions(+), 13 deletions(-)

diff -puN arch/i386/kernel/traps.c~x86_64-mm-fix-i386-and-x86_64-fault-information-pollution arch/i386/kernel/traps.c
--- a/arch/i386/kernel/traps.c~x86_64-mm-fix-i386-and-x86_64-fault-information-pollution
+++ a/arch/i386/kernel/traps.c
@@ -477,8 +477,6 @@ static void __kprobes do_trap(int trapnr
 			      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)
@@ -490,6 +488,18 @@ static void __kprobes do_trap(int trapnr
 		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
@@ -498,8 +508,11 @@ static void __kprobes do_trap(int trapnr
 	}
 
 	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;
 	}
 
@@ -604,9 +617,6 @@ fastcall void __kprobes do_general_prote
 	}
 	put_cpu();
 
-	current->thread.error_code = error_code;
-	current->thread.trap_no = 13;
-
 	if (regs->eflags & VM_MASK)
 		goto gp_in_vm86;
 
@@ -625,6 +635,8 @@ 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;
diff -puN arch/x86_64/kernel/traps.c~x86_64-mm-fix-i386-and-x86_64-fault-information-pollution arch/x86_64/kernel/traps.c
--- a/arch/x86_64/kernel/traps.c~x86_64-mm-fix-i386-and-x86_64-fault-information-pollution
+++ a/arch/x86_64/kernel/traps.c
@@ -582,10 +582,20 @@ static void __kprobes do_trap(int trapnr
 {
 	struct task_struct *tsk = current;
 
-	tsk->thread.error_code = error_code;
-	tsk->thread.trap_no = trapnr;
-
 	if (user_mode(regs)) {
+		/*
+		 * 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 (exception_trace && unhandled_signal(tsk, signr))
 			printk(KERN_INFO
 			       "%s[%d] trap %s rip:%lx rsp:%lx error:%lx\n",
@@ -606,8 +616,11 @@ static void __kprobes do_trap(int trapnr
 		fixup = search_exception_tables(regs->rip);
 		if (fixup)
 			regs->rip = fixup->fixup;
-		else	
+		else {
+			tsk->thread.error_code = error_code;
+			tsk->thread.trap_no = trapnr;
 			die(str, regs, error_code);
+		}
 		return;
 	}
 }
@@ -683,10 +696,10 @@ asmlinkage void __kprobes do_general_pro
 
 	conditional_sti(regs);
 
-	tsk->thread.error_code = error_code;
-	tsk->thread.trap_no = 13;
-
 	if (user_mode(regs)) {
+		tsk->thread.error_code = error_code;
+		tsk->thread.trap_no = 13;
+
 		if (exception_trace && unhandled_signal(tsk, SIGSEGV))
 			printk(KERN_INFO
 		       "%s[%d] general protection rip:%lx rsp:%lx error:%lx\n",
@@ -705,6 +718,9 @@ asmlinkage void __kprobes do_general_pro
 			regs->rip = fixup->fixup;
 			return;
 		}
+
+		tsk->thread.error_code = error_code;
+		tsk->thread.trap_no = 13;
 		if (notify_die(DIE_GPF, "general protection fault", regs,
 					error_code, 13, SIGSEGV) == NOTIFY_STOP)
 			return;
_