Re: [RESEND][PATCH] userns: use marco instead of magic number for max userns level

[Serge Hallyn]

Quoting Chen Hanxiao (chenhanxiao@xxxxxxxxxxxxxx):
> Use marco instead of magic number
> for max user namespace level.
> 
> Signed-off-by: Chen Hanxiao <chenhanxiao@xxxxxxxxxxxxxx>

Acked-by: Serge E. Hallyn <serge.hallyn@xxxxxxxxxx>

> ---
>  kernel/user_namespace.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
> index aa312b0..5435489 100644
> --- a/kernel/user_namespace.c
> +++ b/kernel/user_namespace.c
> @@ -47,6 +47,8 @@ static void set_cred_user_ns(struct cred *cred, struct user_namespace *user_ns)
>  	cred->user_ns = user_ns;
>  }
>  
> +#define MAX_USER_NS_LEVEL 32
> +
>  /*
>   * Create a new user namespace, deriving the creator from the user in the
>   * passed credentials, and replacing that user with the new root user for the
> @@ -62,7 +64,7 @@ int create_user_ns(struct cred *new)
>  	kgid_t group = new->egid;
>  	int ret;
>  
> -	if (parent_ns->level > 32)
> +	if (parent_ns->level > MAX_USER_NS_LEVEL)
>  		return -EUSERS;
>  
>  	/*
> -- 
> 1.9.0
> 
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