1 files changed, 10 insertions, 130 deletions

diff --git a/kernel/signal.c b/kernel/signal.c
index 1368e67c8482..2ac3a668d9dd 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -38,125 +38,6 @@
 
 static struct kmem_cache *sigqueue_cachep;
 
-/*
- * In POSIX a signal is sent either to a specific thread (Linux task)
- * or to the process as a whole (Linux thread group).  How the signal
- * is sent determines whether it's to one thread or the whole group,
- * which determines which signal mask(s) are involved in blocking it
- * from being delivered until later.  When the signal is delivered,
- * either it's caught or ignored by a user handler or it has a default
- * effect that applies to the whole thread group (POSIX process).
- *
- * The possible effects an unblocked signal set to SIG_DFL can have are:
- *   ignore     - Nothing Happens
- *   terminate  - kill the process, i.e. all threads in the group,
- *                similar to exit_group.  The group leader (only) reports
- *                WIFSIGNALED status to its parent.
- *   coredump   - write a core dump file describing all threads using
- *                the same mm and then kill all those threads
- *   stop       - stop all the threads in the group, i.e. TASK_STOPPED state
- *
- * SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.
- * Other signals when not blocked and set to SIG_DFL behaves as follows.
- * The job control signals also have other special effects.
- *
- *      +--------------------+------------------+
- *      |  POSIX signal      |  default action  |
- *      +--------------------+------------------+
- *      |  SIGHUP            |  terminate       |
- *      |  SIGINT            |  terminate       |
- *      |  SIGQUIT           |  coredump        |
- *      |  SIGILL            |  coredump        |
- *      |  SIGTRAP           |  coredump        |
- *      |  SIGABRT/SIGIOT    |  coredump        |
- *      |  SIGBUS            |  coredump        |
- *      |  SIGFPE            |  coredump        |
- *      |  SIGKILL           |  terminate(+)    |
- *      |  SIGUSR1           |  terminate       |
- *      |  SIGSEGV           |  coredump        |
- *      |  SIGUSR2           |  terminate       |
- *      |  SIGPIPE           |  terminate       |
- *      |  SIGALRM           |  terminate       |
- *      |  SIGTERM           |  terminate       |
- *      |  SIGCHLD           |  ignore          |
- *      |  SIGCONT           |  ignore(*)       |
- *      |  SIGSTOP           |  stop(*)(+)      |
- *      |  SIGTSTP           |  stop(*)         |
- *      |  SIGTTIN           |  stop(*)         |
- *      |  SIGTTOU           |  stop(*)         |
- *      |  SIGURG            |  ignore          |
- *      |  SIGXCPU           |  coredump        |
- *      |  SIGXFSZ           |  coredump        |
- *      |  SIGVTALRM         |  terminate       |
- *      |  SIGPROF           |  terminate       |
- *      |  SIGPOLL/SIGIO     |  terminate       |
- *      |  SIGSYS/SIGUNUSED  |  coredump        |
- *      |  SIGSTKFLT         |  terminate       |
- *      |  SIGWINCH          |  ignore          |
- *      |  SIGPWR            |  terminate       |
- *      |  SIGRTMIN-SIGRTMAX |  terminate       |
- *      +--------------------+------------------+
- *      |  non-POSIX signal  |  default action  |
- *      +--------------------+------------------+
- *      |  SIGEMT            |  coredump        |
- *      +--------------------+------------------+
- *
- * (+) For SIGKILL and SIGSTOP the action is "always", not just "default".
- * (*) Special job control effects:
- * When SIGCONT is sent, it resumes the process (all threads in the group)
- * from TASK_STOPPED state and also clears any pending/queued stop signals
- * (any of those marked with "stop(*)").  This happens regardless of blocking,
- * catching, or ignoring SIGCONT.  When any stop signal is sent, it clears
- * any pending/queued SIGCONT signals; this happens regardless of blocking,
- * catching, or ignored the stop signal, though (except for SIGSTOP) the
- * default action of stopping the process may happen later or never.
- */
-
-#ifdef SIGEMT
-#define M_SIGEMT        M(SIGEMT)
-#else
-#define M_SIGEMT        0
-#endif
-
-#if SIGRTMIN > BITS_PER_LONG
-#define M(sig) (1ULL << ((sig)-1))
-#else
-#define M(sig) (1UL << ((sig)-1))
-#endif
-#define T(sig, mask) (M(sig) & (mask))
-
-#define SIG_KERNEL_ONLY_MASK (\
-        M(SIGKILL)   |  M(SIGSTOP)                                   )
-
-#define SIG_KERNEL_STOP_MASK (\
-        M(SIGSTOP)   |  M(SIGTSTP)   |  M(SIGTTIN)   |  M(SIGTTOU)   )
-
-#define SIG_KERNEL_COREDUMP_MASK (\
-        M(SIGQUIT)   |  M(SIGILL)    |  M(SIGTRAP)   |  M(SIGABRT)   | \
-        M(SIGFPE)    |  M(SIGSEGV)   |  M(SIGBUS)    |  M(SIGSYS)    | \
-        M(SIGXCPU)   |  M(SIGXFSZ)   |  M_SIGEMT                     )
-
-#define SIG_KERNEL_IGNORE_MASK (\
-        M(SIGCONT)   |  M(SIGCHLD)   |  M(SIGWINCH)  |  M(SIGURG)    )
-
-#define sig_kernel_only(sig) \
-                (((sig) < SIGRTMIN)  && T(sig, SIG_KERNEL_ONLY_MASK))
-#define sig_kernel_coredump(sig) \
-                (((sig) < SIGRTMIN)  && T(sig, SIG_KERNEL_COREDUMP_MASK))
-#define sig_kernel_ignore(sig) \
-                (((sig) < SIGRTMIN)  && T(sig, SIG_KERNEL_IGNORE_MASK))
-#define sig_kernel_stop(sig) \
-                (((sig) < SIGRTMIN)  && T(sig, SIG_KERNEL_STOP_MASK))
-
-#define sig_needs_tasklist(sig) ((sig) == SIGCONT)
-
-#define sig_user_defined(t, signr) \
-        (((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) &&  \
-         ((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN))
-
-#define sig_fatal(t, signr) \
-        (!T(signr, SIG_KERNEL_IGNORE_MASK|SIG_KERNEL_STOP_MASK) && \
-         (t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL)
 
 static int sig_ignored(struct task_struct *t, int sig)
 {
@@ -328,6 +209,16 @@ void flush_signals(struct task_struct *t)
         spin_unlock_irqrestore(&t->sighand->siglock, flags);
 }
 
+void ignore_signals(struct task_struct *t)
+{
+        int i;
+
+        for (i = 0; i < _NSIG; ++i)
+                t->sighand->action[i].sa.sa_handler = SIG_IGN;
+
+        flush_signals(t);
+}
+
 /*
  * Flush all handlers for a task.
  */
@@ -1032,17 +923,6 @@ void zap_other_threads(struct task_struct *p)
                 if (t->exit_state)
                         continue;
 
-                /*
-                 * We don't want to notify the parent, since we are
-                 * killed as part of a thread group due to another
-                 * thread doing an execve() or similar. So set the
-                 * exit signal to -1 to allow immediate reaping of
-                 * the process.  But don't detach the thread group
-                 * leader.
-                 */
-                if (t != p->group_leader)
-                        t->exit_signal = -1;
-
                 /* SIGKILL will be handled before any pending SIGSTOP */
                 sigaddset(&t->pending.signal, SIGKILL);
                 signal_wake_up(t, 1);