kgdb, x86, arm, mips, powerpc: ignore user space single stepping

On the x86 arch, user space single step exceptions should be ignored
if they occur in the kernel space, such as ptrace stepping through a
system call.

First check if it is kgdb that is executing a single step, then ensure
it is not an accidental traversal into the user space, while in kgdb,
any other time the TIF_SINGLESTEP is set, kgdb should ignore the
exception.

On x86, arm, mips and powerpc, the kgdb_contthread usage was
inconsistent with the way single stepping is implemented in the kgdb
core.  The arch specific stub should always set the
kgdb_cpu_doing_single_step correctly if it is single stepping.  This
allows kgdb to correctly process an instruction steps if ptrace
happens to be requesting an instruction step over a system call.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>

1 files changed, 11 insertions, 7 deletions

diff --git a/arch/x86/kernel/kgdb.c b/arch/x86/kernel/kgdb.c
index f47f0eb886b8..00f7896c9a19 100644
--- a/arch/x86/kernel/kgdb.c
+++ b/arch/x86/kernel/kgdb.c
@@ -378,10 +378,8 @@ int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
                 if (remcomInBuffer[0] == 's') {
                         linux_regs->flags |= X86_EFLAGS_TF;
                         kgdb_single_step = 1;
-                        if (kgdb_contthread) {
-                                atomic_set(&kgdb_cpu_doing_single_step,
-                                           raw_smp_processor_id());
-                        }
+                        atomic_set(&kgdb_cpu_doing_single_step,
+                                   raw_smp_processor_id());
                 }
 
                 get_debugreg(dr6, 6);
@@ -466,9 +464,15 @@ static int __kgdb_notify(struct die_args *args, unsigned long cmd)
 
         case DIE_DEBUG:
                 if (atomic_read(&kgdb_cpu_doing_single_step) ==
-                        raw_smp_processor_id() &&
-                        user_mode(regs))
-                        return single_step_cont(regs, args);
+                    raw_smp_processor_id()) {
+                        if (user_mode(regs))
+                                return single_step_cont(regs, args);
+                        break;
+                } else if (test_thread_flag(TIF_SINGLESTEP))
+                        /* This means a user thread is single stepping
+                         * a system call which should be ignored
+                         */
+                        return NOTIFY_DONE;
                 /* fall through */
         default:
                 if (user_mode(regs))