From f701e5b73a1a79ea62ffd45d9e2bed4c7d5c1fd2 Mon Sep 17 00:00:00 2001 From: Vladimir Zapolskiy Date: Fri, 15 Jul 2011 20:45:18 +0300 Subject: connector: add an event for monitoring process tracers This change adds a procfs connector event, which is emitted on every successful process tracer attach or detach. If some process connects to other one, kernelspace connector reports process id and thread group id of both these involved processes. On disconnection null process id is returned. Such an event allows to create a simple automated userspace mechanism to be aware about processes connecting to others, therefore predefined process policies can be applied to them if needed. Note, a detach signal is emitted only in case, if a tracer process explicitly executes PTRACE_DETACH request. In other cases like tracee or tracer exit detach event from proc connector is not reported. Signed-off-by: Vladimir Zapolskiy Acked-by: Evgeniy Polyakov Cc: David S. Miller Signed-off-by: Oleg Nesterov --- kernel/ptrace.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'kernel/ptrace.c') diff --git a/kernel/ptrace.c b/kernel/ptrace.c index d7ccc79454f5..9de3ecfd20f9 100644 --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -23,6 +23,7 @@ #include #include #include +#include static int ptrace_trapping_sleep_fn(void *flags) @@ -305,9 +306,12 @@ unlock_tasklist: unlock_creds: mutex_unlock(&task->signal->cred_guard_mutex); out: - if (!retval) + if (!retval) { wait_on_bit(&task->jobctl, JOBCTL_TRAPPING_BIT, ptrace_trapping_sleep_fn, TASK_UNINTERRUPTIBLE); + proc_ptrace_connector(task, PTRACE_ATTACH); + } + return retval; } @@ -415,6 +419,7 @@ static int ptrace_detach(struct task_struct *child, unsigned int data) } write_unlock_irq(&tasklist_lock); + proc_ptrace_connector(child, PTRACE_DETACH); if (unlikely(dead)) release_task(child); -- cgit v1.2.3