[PATCH] x86: Fix i386 and x86_64 fault information pollution

a userspace fault or a kernelspace fault which will result in the
immediate death of the process.  They should not be filled in as a
result of a kernelspace fault which can be fixed up.

Otherwise, if the process is handling SIGSEGV and examining the fault
information, this can result in the kernel space fault trashing the
previously stored fault information if it arrives between the
userspace fault happening and the SIGSEGV being delivered to the process.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Acked-by: Jan Beulich <jbeulich@novell.com>
--
 arch/i386/kernel/traps.c   |   24 ++++++++++++++++++------
 arch/x86_64/kernel/traps.c |   30 +++++++++++++++++++++++-------
 2 files changed, 41 insertions(+), 13 deletions(-)

1 files changed, 23 insertions, 7 deletions

diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index 09d2e8a10a49..cceef5bd7302 100644
--- a/arch/x86_64/kernel/traps.c
+++ b/arch/x86_64/kernel/traps.c
@@ -581,10 +581,20 @@ static void __kprobes do_trap(int trapnr, int signr, char *str,
 {
         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",
@@ -605,8 +615,11 @@ static void __kprobes do_trap(int trapnr, int signr, char *str,
                 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;
         }
 }
@@ -682,10 +695,10 @@ asmlinkage void __kprobes do_general_protection(struct pt_regs * regs,
 
         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",
@@ -704,6 +717,9 @@ asmlinkage void __kprobes do_general_protection(struct pt_regs * regs,
                         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;