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From:   Haifeng Xu <haifeng.xu@shopee.com>
To:     brauner@kernel.org
Cc:     ebiederm@xmission.com, tglx@linutronix.de, luto@kernel.org,
        bigeasy@linutronix.de, akpm@linux-foundation.org,
        fenghua.yu@intel.com, peterz@infradead.org,
        linux-kernel@vger.kernel.org, Haifeng Xu <haifeng.xu@shopee.com>
Subject: [PATCH] fork: Avoid inherit PF_IO_WORKER flag
Date:   Thu, 15 Dec 2022 02:01:22 +0000
Message-Id: <20221215020122.762684-1-haifeng.xu@shopee.com>
MIME-Version: 1.0
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copy_process examines arguments in kernel_clone_args to see if
PF_IO_WORKER need to be set, so the flag should not inherit from
parent process.

Signed-off-by: Haifeng Xu <haifeng.xu@shopee.com>
---
 kernel/fork.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/fork.c b/kernel/fork.c
index 947eb1a6399a..50498e5d10dd 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -2088,6 +2088,7 @@ static __latent_entropy struct task_struct *copy_process(
 	p->flags &= ~PF_KTHREAD;
 	if (args->kthread)
 		p->flags |= PF_KTHREAD;
+	p->flags &= ~PF_IO_WORKER;
 	if (args->io_thread) {
 		/*
 		 * Mark us an IO worker, and block any signal that isn't
-- 
2.25.1