linux-kernel - [PATCH 3/3] vhost: pass kthread user to check RLIMIT

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Date:   Wed, 23 Jun 2021 22:08:04 -0500
From:   Mike Christie <michael.christie@...cle.com>
To:     linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, mst@...hat.com,
        sgarzare@...hat.com, jasowang@...hat.com, stefanha@...hat.com,
        christian@...uner.io, akpm@...ux-foundation.org,
        peterz@...radead.org, christian.brauner@...ntu.com
Cc:     Mike Christie <michael.christie@...cle.com>
Subject: [PATCH 3/3] vhost: pass kthread user to check RLIMIT_NPROC

This has vhost pass in the user to the kthread API, so the process doing
the ioctl has its RLIMIT_NPROC checked and its processes count
incremented.

Signed-off-by: Mike Christie <michael.christie@...cle.com>
---
 drivers/vhost/vhost.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 5ccb0705beae..141cca6fd50a 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -595,8 +595,9 @@ long vhost_dev_set_owner(struct vhost_dev *dev)
 
 	dev->kcov_handle = kcov_common_handle();
 	if (dev->use_worker) {
-		worker = kthread_create(vhost_worker, dev,
-					"vhost-%d", current->pid);
+		worker = kthread_create_for_user(vhost_worker, dev,
+						 current->real_cred->user,
+						 "vhost-%d", current->pid);
 		if (IS_ERR(worker)) {
 			err = PTR_ERR(worker);
 			goto err_worker;
-- 
2.25.1