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SubjectRe: [PATCH 4.19 21/57] proc: dont allow async path resolution of /proc/self components
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Hi,

On 2020/12/1 16:53, Greg Kroah-Hartman wrote:
> From: Jens Axboe <axboe@kernel.dk>
>
> [ Upstream commit 8d4c3e76e3be11a64df95ddee52e99092d42fc19 ]
>
> If this is attempted by a kthread, then return -EOPNOTSUPP as we don't
> currently support that. Once we can get task_pid_ptr() doing the right
> thing, then this can go away again.

https://www.spinics.net/lists/io-uring/msg05297.html

This patch seems used for io-wq worker which is merged in

v5.5-rc1, why we need this in linux-4.19.y ?


Thanks,

Yang

>
> Signed-off-by: Jens Axboe <axboe@kernel.dk>
> Signed-off-by: Sasha Levin <sashal@kernel.org>
> ---
> fs/proc/self.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/fs/proc/self.c b/fs/proc/self.c
> index cc6d4253399d1..7922edf70ce1a 100644
> --- a/fs/proc/self.c
> +++ b/fs/proc/self.c
> @@ -16,6 +16,13 @@ static const char *proc_self_get_link(struct dentry *dentry,
> pid_t tgid = task_tgid_nr_ns(current, ns);
> char *name;
>
> + /*
> + * Not currently supported. Once we can inherit all of struct pid,
> + * we can allow this.
> + */
> + if (current->flags & PF_KTHREAD)
> + return ERR_PTR(-EOPNOTSUPP);
> +
> if (!tgid)
> return ERR_PTR(-ENOENT);
> /* max length of unsigned int in decimal + NULL term */

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