linux-kernel - [PATCH] fork: Avoid inherit PF_IO

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-Id: <20221215020122.762684-1-haifeng.xu@shopee.com>
Date:   Thu, 15 Dec 2022 02:01:22 +0000
From:   Haifeng Xu <haifeng.xu@...pee.com>
To:     brauner@...nel.org
Cc:     ebiederm@...ssion.com, tglx@...utronix.de, luto@...nel.org,
        bigeasy@...utronix.de, akpm@...ux-foundation.org,
        fenghua.yu@...el.com, peterz@...radead.org,
        linux-kernel@...r.kernel.org, Haifeng Xu <haifeng.xu@...pee.com>
Subject: [PATCH] fork: Avoid inherit PF_IO_WORKER flag

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@...pee.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