Re: PATCH -mm] fix create_new_namespaces() return value

[Badari Pulavarty <pbadari@us.ibm.com>]

Cedric Le Goater wrote:

> The following patch modifies create_new_namespaces() to also use the 
> errors returned by the copy_*_ns routines and not to systematically 
> return ENOMEM.

In my initial version, I did same. It doesn't work :(

copy_*_ns() routines doesn't return any errors. All they return is NULL 
in case of a
failure + with the exception of copy_mnt_ns, there are no other failure 
cases.
So, there is no way to find out why the copy_*_ns() routines failed from 
create_new_namespaces().
If you really really want to do this, change all copy_*_ns() routines to 
returns meaningful
errors instead of NULL.

> Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
> Cc: Serge E. Hallyn <serue@us.ibm.com>
> Cc: Badari Pulavarty <pbadari@us.ibm.com>
> Cc: Pavel Emelianov <xemul@openvz.org>
> Cc: Herbert Poetzl <herbert@13thfloor.at>
> Cc: Eric W. Biederman <ebiederm@xmission.com>
> ---
> kernel/nsproxy.c |   23 +++++++++++++++++------
> 1 file changed, 17 insertions(+), 6 deletions(-)
>
> Index: 2.6.22-rc4-mm2/kernel/nsproxy.c
> ===================================================================
> --- 2.6.22-rc4-mm2.orig/kernel/nsproxy.c
> +++ 2.6.22-rc4-mm2/kernel/nsproxy.c
> @@ -58,30 +58,41 @@ static struct nsproxy *create_new_namesp
> 			struct fs_struct *new_fs)
> {
> 	struct nsproxy *new_nsp;
> +	int err;
>
> 	new_nsp = clone_nsproxy(tsk->nsproxy);
> 	if (!new_nsp)
> 		return ERR_PTR(-ENOMEM);
>
> 	new_nsp->mnt_ns = copy_mnt_ns(flags, tsk->nsproxy->mnt_ns, new_fs);
> -	if (IS_ERR(new_nsp->mnt_ns))
> +	if (IS_ERR(new_nsp->mnt_ns)) {
> +		err = PTR_ERR(new_nsp->mnt_ns);
> 		goto out_ns;
> +	}
>
> 	new_nsp->uts_ns = copy_utsname(flags, tsk->nsproxy->uts_ns);
> -	if (IS_ERR(new_nsp->uts_ns))
> +	if (IS_ERR(new_nsp->uts_ns)) {
> +		err = PTR_ERR(new_nsp->uts_ns);
> 		goto out_uts;
> +	}
>
> 	new_nsp->ipc_ns = copy_ipcs(flags, tsk->nsproxy->ipc_ns);
> -	if (IS_ERR(new_nsp->ipc_ns))
> +	if (IS_ERR(new_nsp->ipc_ns)) {
> +		err = PTR_ERR(new_nsp->ipc_ns);
> 		goto out_ipc;
> +	}
>
> 	new_nsp->pid_ns = copy_pid_ns(flags, tsk->nsproxy->pid_ns);
> -	if (IS_ERR(new_nsp->pid_ns))
> +	if (IS_ERR(new_nsp->pid_ns)) {
> +		err = PTR_ERR(new_nsp->pid_ns);
> 		goto out_pid;
> +	}
>
> 	new_nsp->user_ns = copy_user_ns(flags, tsk->nsproxy->user_ns);
> -	if (IS_ERR(new_nsp->user_ns))
> +	if (IS_ERR(new_nsp->user_ns)) {
> +		err = PTR_ERR(new_nsp->user_ns);
Hmm.. copy_user_ns() ? I don't see this in rc4-mm2.

Thanks,
Badari


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