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From: Stefan Metzmacher <[email protected]>
To: [email protected]
Cc: Stefan Metzmacher <[email protected]>
Subject: [PATCH v2 5/5] fs/proc: hide PF_IO_WORKER in get_task_cmdline()
Date: Sat, 20 Mar 2021 01:00:31 +0100	[thread overview]
Message-ID: <d4487f959c778d0b1d4c5738b75bcff17d21df5b.1616197787.git.metze@samba.org> (raw)
In-Reply-To: <[email protected]>

We should not return the userspace cmdline for io_worker threads.

Signed-off-by: Stefan Metzmacher <[email protected]>
---
 fs/proc/base.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 3851bfcdba56..6e04278de582 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -344,6 +344,9 @@ static ssize_t get_task_cmdline(struct task_struct *tsk, char __user *buf,
 	struct mm_struct *mm;
 	ssize_t ret;
 
+	if (tsk->flags & PF_IO_WORKER)
+		return 0;
+
 	mm = get_task_mm(tsk);
 	if (!mm)
 		return 0;
-- 
2.25.1


  parent reply	other threads:[~2021-03-20  0:02 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-19 23:27 Problems with io_threads Stefan Metzmacher
2021-03-15 17:01 ` [RFC PATCH 00/10] Complete setup before calling wake_up_new_task() and improve task->comm Stefan Metzmacher
2021-03-15 17:01   ` [RFC PATCH 01/10] kernel: always initialize task->pf_io_worker to NULL Stefan Metzmacher
2021-03-15 17:01   ` [RFC PATCH 02/10] io_uring: io_sq_thread() no longer needs to reset current->pf_io_worker Stefan Metzmacher
2021-03-15 17:01   ` [RFC PATCH 03/10] io-wq: call set_task_comm() before wake_up_new_task() Stefan Metzmacher
2021-03-15 17:01   ` [RFC PATCH 04/10] io_uring: complete sq_thread setup before calling wake_up_new_task() Stefan Metzmacher
2021-03-15 17:01   ` [RFC PATCH 05/10] io-wq: protect against future set_task_comm() overflows Stefan Metzmacher
2021-03-15 17:01   ` [RFC PATCH 06/10] io_uring: " Stefan Metzmacher
2021-03-15 17:01   ` [RFC PATCH 07/10] fs/proc: hide PF_IO_WORKER in get_task_cmdline() Stefan Metzmacher
2021-03-15 17:01   ` [RFC PATCH 08/10] fs/proc: protect /proc/<pid>/[task/<tid>]/comm for PF_IO_WORKER Stefan Metzmacher
2021-03-15 17:01   ` [RFC PATCH 09/10] io-wq: add io_wq_worker_comm() helper function for dynamic proc_task_comm() generation Stefan Metzmacher
2021-03-15 17:01   ` [RFC PATCH 10/10] fs/proc: make use of io_wq_worker_comm() for PF_IO_WORKER threads Stefan Metzmacher
2021-03-17 22:42   ` [RFC PATCH 00/10] Complete setup before calling wake_up_new_task() and improve task->comm Jens Axboe
2021-03-17 23:06     ` Stefan Metzmacher
2021-03-17 23:26       ` Jens Axboe
2021-03-20  0:00   ` [PATCH v2 0/5] " Stefan Metzmacher
2021-03-20  0:00     ` [PATCH v2 1/5] kernel: always initialize task->pf_io_worker to NULL Stefan Metzmacher
2021-03-20  0:00     ` [PATCH v2 2/5] io_uring: io_sq_thread() no longer needs to reset current->pf_io_worker Stefan Metzmacher
2021-03-20  0:00     ` [PATCH v2 3/5] io-wq: call set_task_comm() before wake_up_new_task() Stefan Metzmacher
2021-03-20  0:00     ` [PATCH v2 4/5] io_uring: complete sq_thread setup before calling wake_up_new_task() Stefan Metzmacher
2021-03-20  0:00     ` Stefan Metzmacher [this message]
2021-03-20  1:24     ` [PATCH v2 0/5] Complete setup before calling wake_up_new_task() and improve task->comm Jens Axboe
2021-03-20 19:22       ` Stefan Metzmacher
2021-03-20 22:39         ` Jens Axboe
2021-03-19 23:46 ` Problems with io_threads Jens Axboe
2021-03-20  0:25   ` Stefan Metzmacher
2021-03-20  1:20     ` Jens Axboe

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