From af1abab986b85fdeb3e98c037988cfa4bf9d4018 Mon Sep 17 00:00:00 2001
From: "Eric W. Biederman" <ebiederm@xmission.com>
Date: Wed, 27 Jun 2018 14:39:54 -0500
Subject: [PATCH] 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@addtoit.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.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 b80a1d616e4ea..e8f5c81c2c6c4 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;