Commit 49d04a69 authored Nov 13, 2020 by Jens Axboe Committed by Greg Kroah-Hartman Dec 02, 2020

proc: don't allow async path resolution of /proc/self components



[ Upstream commit 8d4c3e76e3be11a64df95ddee52e99092d42fc19 ]

If this is attempted by a kthread, then return -EOPNOTSUPP as we don't
currently support that. Once we can get task_pid_ptr() doing the right
thing, then this can go away again.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>

parent e7daa884

fs/proc/self.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -16,6 +16,13 @@ static const char proc_self_get_link(struct dentry dentry,
		pid_t tgid = task_tgid_nr_ns(current, ns);
		char *name;

		/*
		* Not currently supported. Once we can inherit all of struct pid,
		* we can allow this.
		*/
		if (current->flags & PF_KTHREAD)
		return ERR_PTR(-EOPNOTSUPP);

		if (!tgid)
		return ERR_PTR(-ENOENT);
		/* max length of unsigned int in decimal + NULL term */