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fix ptrace_detach bug

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refs #662
This commit is contained in:
Tomoki Shirasawa
2015-12-16 17:41:57 +09:00
parent a055fb525d
commit 7e5c7445e2
1 changed files with 19 additions and 18 deletions
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37
kernel/syscall.c
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@ -1592,20 +1592,6 @@ static int ptrace_report_clone(struct thread *thread, struct thread *new, int ev
parent_pid = thread->proc->parent->pid;
mcs_rwlock_writer_unlock_noirq(&thread->proc->update_lock, &lock);
dkprintf("ptrace_report_clone,kill SIGCHLD\n");
memset(&info, '\0', sizeof info);
info.si_signo = SIGCHLD;
info.si_code = CLD_TRAPPED;
info._sifields._sigchld.si_pid = thread->proc->pid;
info._sifields._sigchld.si_status = thread->proc->exit_status;
rc = do_kill(cpu_local_var(current), parent_pid, -1, SIGCHLD, &info, 0);
if(rc < 0) {
dkprintf("ptrace_report_clone,do_kill failed\n");
}
/* Wake parent (if sleeping in wait4()) */
waitq_wakeup(&thread->proc->parent->waitpid_q);
if (event != PTRACE_EVENT_VFORK_DONE) {
/* PTRACE_EVENT_FORK or PTRACE_EVENT_VFORK or PTRACE_EVENT_CLONE */
@ -1636,6 +1622,20 @@ static int ptrace_report_clone(struct thread *thread, struct thread *new, int ev
mcs_rwlock_writer_unlock_noirq(&new->proc->update_lock, &updatelock);
}
dkprintf("ptrace_report_clone,kill SIGCHLD\n");
memset(&info, '\0', sizeof info);
info.si_signo = SIGCHLD;
info.si_code = CLD_TRAPPED;
info._sifields._sigchld.si_pid = thread->proc->pid;
info._sifields._sigchld.si_status = thread->proc->exit_status;
rc = do_kill(cpu_local_var(current), parent_pid, -1, SIGCHLD, &info, 0);
if(rc < 0) {
dkprintf("ptrace_report_clone,do_kill failed\n");
}
/* Wake parent (if sleeping in wait4()) */
waitq_wakeup(&thread->proc->parent->waitpid_q);
return error;
}
@ -4203,18 +4203,19 @@ int ptrace_detach(int pid, int data)
goto out;
}
mcs_rwlock_writer_lock_noirq(&proc->update_lock, &updatelock);
child = thread->proc;
mcs_rwlock_writer_lock_noirq(&child->update_lock, &updatelock);
parent = child->ppid_parent;
if (!(proc->ptrace & PT_TRACED) || proc->parent != proc) {
mcs_rwlock_writer_unlock_noirq(&proc->update_lock, &updatelock);
if (!(child->ptrace & PT_TRACED) || child->parent != proc) {
mcs_rwlock_writer_unlock_noirq(&child->update_lock, &updatelock);
thread_unlock(thread, &lock);
error = -ESRCH;
goto out;
}
mcs_rwlock_writer_unlock_noirq(&child->update_lock, &updatelock);
mcs_rwlock_writer_lock_noirq(&proc->children_lock, &childlock);
list_del(&proc->siblings_list);
list_del(&child->siblings_list);
mcs_rwlock_writer_unlock_noirq(&proc->children_lock, &childlock);
mcs_rwlock_writer_lock_noirq(&parent->children_lock, &childlock);