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Date: Fri, 28 Feb 2020 14:18:14 -0600
From: ebiederm@...ssion.com (Eric W. Biederman)
To: <linux-kernel@...r.kernel.org>
Cc: Al Viro <viro@...iv.linux.org.uk>, Kernel Hardening
<kernel-hardening@...ts.openwall.com>, Linux API
<linux-api@...r.kernel.org>, Linux FS Devel
<linux-fsdevel@...r.kernel.org>, Linux Security Module
<linux-security-module@...r.kernel.org>, Akinobu Mita
<akinobu.mita@...il.com>, Alexey Dobriyan <adobriyan@...il.com>, Andrew
Morton <akpm@...ux-foundation.org>, Andy Lutomirski <luto@...nel.org>,
Daniel Micay <danielmicay@...il.com>, Djalal Harouni <tixxdz@...il.com>,
"Dmitry V . Levin" <ldv@...linux.org>, Greg Kroah-Hartman
<gregkh@...uxfoundation.org>, Ingo Molnar <mingo@...nel.org>, "J . Bruce
Fields" <bfields@...ldses.org>, Jeff Layton <jlayton@...chiereds.net>,
Jonathan Corbet <corbet@....net>, Kees Cook <keescook@...omium.org>,
Oleg Nesterov <oleg@...hat.com>, Alexey Gladkov
<gladkov.alexey@...il.com>, Linus Torvalds
<torvalds@...ux-foundation.org>, Jeff Dike <jdike@...toit.com>, Richard
Weinberger <richard@....at>, Anton Ivanov
<anton.ivanov@...bridgegreys.com>
Subject: [PATCH 1/3] uml: Don't consult current to find the proc_mnt in mconsole_proc
Inspection of the control flow reveals that mconsole_proc is either
called from mconsole_stop called from mc_work_proc or from
mc_work_proc directly. The function mc_work_proc is dispatched to a
kernel thread with schedule_work.
All of the threads that run dispatched by schedule_work are in the
init pid namespace.
So make the code clearer and by using init_pid_ns instead of
task_active_pid_ns(current).
Cc: Jeff Dike <jdike@...toit.com>
Cc: Richard Weinberger <richard@....at>
Cc: Anton Ivanov <anton.ivanov@...bridgegreys.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
arch/um/drivers/mconsole_kern.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
index b80a1d616e4e..e8f5c81c2c6c 100644
--- a/arch/um/drivers/mconsole_kern.c
+++ b/arch/um/drivers/mconsole_kern.c
@@ -123,7 +123,7 @@ void mconsole_log(struct mc_request *req)
void mconsole_proc(struct mc_request *req)
{
- struct vfsmount *mnt = task_active_pid_ns(current)->proc_mnt;
+ struct vfsmount *mnt = init_pid_ns.proc_mnt;
char *buf;
int len;
struct file *file;
--
2.25.0
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