/*
* Tracing hooks
*
- * Copyright (C) 2008 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2008-2009 Red Hat, Inc. All rights reserved.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
*/
static inline void tracehook_report_syscall_exit(struct pt_regs *regs, int step)
{
+ if (step) {
+ siginfo_t info;
+ user_single_step_siginfo(current, regs, &info);
+ force_sig_info(SIGTRAP, &info, current);
+ return;
+ }
+
ptrace_report_syscall(regs);
}
*
* Return %LSM_UNSAFE_* bits applied to an exec because of tracing.
*
- * Called with task_lock() held on @task.
+ * @task->cred_guard_mutex is held by the caller through the do_execve().
*/
static inline int tracehook_unsafe_exec(struct task_struct *task)
{
/**
* tracehook_report_clone - in parent, new child is about to start running
- * @trace: return value from tracehook_prepare_clone()
* @regs: parent's user register state
* @clone_flags: flags from parent's system call
* @pid: new child's PID in the parent's namespace
* @child: new child task
*
- * Called after a child is set up, but before it has been started
- * running. @trace is the value returned by tracehook_prepare_clone().
+ * Called after a child is set up, but before it has been started running.
* This is not a good place to block, because the child has not started
* yet. Suspend the child here if desired, and then block in
* tracehook_report_clone_complete(). This must prevent the child from
*
* Called with no locks held, but the child cannot run until this returns.
*/
-static inline void tracehook_report_clone(int trace, struct pt_regs *regs,
+static inline void tracehook_report_clone(struct pt_regs *regs,
unsigned long clone_flags,
pid_t pid, struct task_struct *child)
{
- if (unlikely(trace) || unlikely(clone_flags & CLONE_PTRACE)) {
+ if (unlikely(task_ptrace(child))) {
/*
- * The child starts up with an immediate SIGSTOP.
+ * It doesn't matter who attached/attaching to this
+ * task, the pending SIGSTOP is right in any case.
*/
sigaddset(&child->pending.signal, SIGSTOP);
set_tsk_thread_flag(child, TIF_SIGPENDING);
* tracehook_consider_ignored_signal - suppress short-circuit of ignored signal
* @task: task receiving the signal
* @sig: signal number being sent
- * @handler: %SIG_IGN or %SIG_DFL
*
* Return zero iff tracing doesn't care to examine this ignored signal,
* so it can short-circuit normal delivery and never even get queued.
- * Either @handler is %SIG_DFL and @sig's default is ignore, or it's %SIG_IGN.
*
* Called with @task->sighand->siglock held.
*/
static inline int tracehook_consider_ignored_signal(struct task_struct *task,
- int sig,
- void __user *handler)
+ int sig)
{
return (task_ptrace(task) & PT_PTRACED) != 0;
}
* tracehook_consider_fatal_signal - suppress special handling of fatal signal
* @task: task receiving the signal
* @sig: signal number being sent
- * @handler: %SIG_DFL or %SIG_IGN
*
* Return nonzero to prevent special handling of this termination signal.
- * Normally @handler is %SIG_DFL. It can be %SIG_IGN if @sig is ignored,
- * in which case force_sig() is about to reset it to %SIG_DFL.
+ * Normally handler for signal is %SIG_DFL. It can be %SIG_IGN if @sig is
+ * ignored, in which case force_sig() is about to reset it to %SIG_DFL.
* When this returns zero, this signal might cause a quick termination
* that does not give the debugger a chance to intercept the signal.
*
* Called with or without @task->sighand->siglock held.
*/
static inline int tracehook_consider_fatal_signal(struct task_struct *task,
- int sig,
- void __user *handler)
+ int sig)
{
return (task_ptrace(task) & PT_PTRACED) != 0;
}
/**
* tracehook_notify_jctl - report about job control stop/continue
- * @notify: nonzero if this is the last thread in the group to stop
+ * @notify: zero, %CLD_STOPPED or %CLD_CONTINUED
* @why: %CLD_STOPPED or %CLD_CONTINUED
*
* This is called when we might call do_notify_parent_cldstop().
- * It's called when about to stop for job control; we are already in
- * %TASK_STOPPED state, about to call schedule(). It's also called when
- * a delayed %CLD_STOPPED or %CLD_CONTINUED report is ready to be made.
*
- * Return nonzero to generate a %SIGCHLD with @why, which is
- * normal if @notify is nonzero.
+ * @notify is zero if we would not ordinarily send a %SIGCHLD,
+ * or is the %CLD_STOPPED or %CLD_CONTINUED .si_code for %SIGCHLD.
*
- * Called with no locks held.
+ * @why is %CLD_STOPPED when about to stop for job control;
+ * we are already in %TASK_STOPPED state, about to call schedule().
+ * It might also be that we have just exited (check %PF_EXITING),
+ * but need to report that a group-wide stop is complete.
+ *
+ * @why is %CLD_CONTINUED when waking up after job control stop and
+ * ready to make a delayed @notify report.
+ *
+ * Return the %CLD_* value for %SIGCHLD, or zero to generate no signal.
+ *
+ * Called with the siglock held.
*/
static inline int tracehook_notify_jctl(int notify, int why)
{
- return notify || (current->ptrace & PT_PTRACED);
+ return notify ?: (current->ptrace & PT_PTRACED) ? why : 0;
+}
+
+/**
+ * tracehook_finish_jctl - report about return from job control stop
+ *
+ * This is called by do_signal_stop() after wakeup.
+ */
+static inline void tracehook_finish_jctl(void)
+{
}
#define DEATH_REAP -1
static inline int tracehook_notify_death(struct task_struct *task,
void **death_cookie, int group_dead)
{
- if (task->exit_signal == -1)
+ if (task_detached(task))
return task->ptrace ? SIGCHLD : DEATH_REAP;
/*
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff