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    Subject[PATCH 4.14 20/50] proc: dont allow async path resolution of /proc/self components
    Date
    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.

    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 398cdf9a9f0c6..eba167e1700ef 100644
    --- a/fs/proc/self.c
    +++ b/fs/proc/self.c
    @@ -15,6 +15,13 @@ 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);
    /* 11 for max length of signed int in decimal + NULL term */
    --
    2.27.0


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