Revert "kernel: treat PF_IO_WORKER like PF_KTHREAD for ptrace/signals"

This reverts commit 6fb8f43cede0e4bd3ead847de78d531424a96be9.

The IO threads do allow signals now, including SIGSTOP, and we can allow
ptrace attach. Attaching won't reveal anything interesting for the IO
threads, but it will allow eg gdb to attach to a task with io_urings
and IO threads without complaining. And once attached, it will allow
the usual introspection into regular threads.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 821cf17..61db50f 100644 (file)
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -375,7 +375,7 @@ static int ptrace_attach(struct task_struct *task, long request,
        audit_ptrace(task);
 
        retval = -EPERM;
-       if (unlikely(task->flags & (PF_KTHREAD | PF_IO_WORKER)))
+       if (unlikely(task->flags & PF_KTHREAD))
                goto out;
        if (same_thread_group(task, current))
                goto out;

diff --git a/kernel/signal.c b/kernel/signal.c
index 9e172b9..dd86841 100644 (file)
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -91,7 +91,7 @@ static bool sig_task_ignored(struct task_struct *t, int sig, bool force)
                return true;
 
        /* Only allow kernel generated signals to this kthread */
-       if (unlikely((t->flags & (PF_KTHREAD | PF_IO_WORKER)) &&
+       if (unlikely((t->flags & PF_KTHREAD) &&
                     (handler == SIG_KTHREAD_KERNEL) && !force))
                return true;
 
@@ -1097,7 +1097,7 @@ static int __send_signal(int sig, struct kernel_siginfo *info, struct task_struc
        /*
         * Skip useless siginfo allocation for SIGKILL and kernel threads.
         */
-       if ((sig == SIGKILL) || (t->flags & (PF_KTHREAD | PF_IO_WORKER)))
+       if ((sig == SIGKILL) || (t->flags & PF_KTHREAD))
                goto out_set;
 
        /*