diff options
Diffstat (limited to 'kernel/fork.c')
| -rw-r--r-- | kernel/fork.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index 2f5f00301182..0280a5996d1d 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -945,6 +945,22 @@ bad_fork_free: goto fork_out; } +static inline int fork_traceflag (unsigned clone_flags) +{ + if (clone_flags & (CLONE_UNTRACED | CLONE_IDLETASK)) + return 0; + else if (clone_flags & CLONE_VFORK) { + if (current->ptrace & PT_TRACE_VFORK) + return PTRACE_EVENT_VFORK; + } else if ((clone_flags & CSIGNAL) != SIGCHLD) { + if (current->ptrace & PT_TRACE_CLONE) + return PTRACE_EVENT_CLONE; + } else if (current->ptrace & PT_TRACE_FORK) + return PTRACE_EVENT_FORK; + + return 0; +} + /* * Ok, this is the main fork-routine. * @@ -958,6 +974,13 @@ struct task_struct *do_fork(unsigned long clone_flags, int *user_tid) { struct task_struct *p; + int trace = 0; + + if (unlikely(current->ptrace)) { + trace = fork_traceflag (clone_flags); + if (trace) + clone_flags |= CLONE_PTRACE; + } p = copy_process(clone_flags, stack_start, regs, stack_size, user_tid); if (!IS_ERR(p)) { @@ -973,6 +996,12 @@ struct task_struct *do_fork(unsigned long clone_flags, wake_up_forked_process(p); /* do this last */ ++total_forks; + + if (unlikely (trace)) { + current->ptrace_message = (unsigned long) p->pid; + ptrace_notify ((trace << 8) | SIGTRAP); + } + if (clone_flags & CLONE_VFORK) wait_for_completion(&vfork); else |