linux-kernel - Re: [PATCH 5/8] SELinux: Stub in copy-up handling

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Date:	Thu, 18 Jun 2015 08:34:02 -0700
From:	Casey Schaufler <casey@...aufler-ca.com>
To:	David Howells <dhowells@...hat.com>, sds@...ho.nsa.gov,
	viro@...iv.linux.org.uk, miklos@...redi.hu
CC:	linux-fsdevel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-unionfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	Casey Schaufler <casey@...aufler-ca.com>
Subject: Re: [PATCH 5/8] SELinux: Stub in copy-up handling

On 6/18/2015 6:32 AM, David Howells wrote:
> Provide stubs for union/overlay copy-up handling.  The xattr copy up stub
> discards lower SELinux xattrs rather than letting them be copied up so that
> the security label on the copy doesn't get corrupted.

Are you planning to do this for Smack, too?

>
> Signed-off-by: David Howells <dhowells@...hat.com>
> ---
>
>  security/selinux/hooks.c |   16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
>
> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index ffa5a642629a..c5d893e2ff23 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -3200,6 +3200,20 @@ static void selinux_inode_getsecid(const struct inode *inode, u32 *secid)
>  	*secid = isec->sid;
>  }
>  
> +static int selinux_inode_copy_up(struct dentry *src, struct dentry *dst)
> +{
> +	return 0;
> +}
> +
> +static int selinux_inode_copy_up_xattr(struct dentry *src, struct dentry *dst,
> +				       const char *name, void *value,
> +				       size_t *size)
> +{
> +	if (strcmp(name, XATTR_NAME_SELINUX) == 0)
> +		return 1; /* Discard */
> +	return 0;
> +}
> +
>  /* file security operations */
>  
>  static int selinux_revalidate_file_permission(struct file *file, int mask)
> @@ -5917,6 +5931,8 @@ static struct security_operations selinux_ops = {
>  	.inode_setsecurity =		selinux_inode_setsecurity,
>  	.inode_listsecurity =		selinux_inode_listsecurity,
>  	.inode_getsecid =		selinux_inode_getsecid,
> +	.inode_copy_up =		selinux_inode_copy_up,
> +	.inode_copy_up_xattr =		selinux_inode_copy_up_xattr,
>  
>  	.file_permission =		selinux_file_permission,
>  	.file_alloc_security =		selinux_file_alloc_security,
>
> --
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