linux-kernel - Re: [PATCH] Smack: ignore private inode for smack_file

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Message-ID: <555111E5.4040100@schaufler-ca.com>
Date:	Mon, 11 May 2015 13:32:37 -0700
From:	Casey Schaufler <casey@...aufler-ca.com>
To:	Seung-Woo Kim <sw0312.kim@...sung.com>, james.l.morris@...cle.com,
	serge@...lyn.com, linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org
CC:	sds@...ho.nsa.gov, sumit.semwal@...aro.org,
	linaro-mm-sig@...ts.linaro.org, jy0922.shim@...sung.com,
	Casey Schaufler <casey@...aufler-ca.com>
Subject: Re: [PATCH] Smack: ignore private inode for smack_file_receive

On 4/16/2015 10:14 PM, Seung-Woo Kim wrote:
> The dmabuf fd can be shared between processes via unix domain
> socket. The file of dmabuf fd is came from anon_inode. The inode
> has no set and get xattr operations, so it can not be shared
> between processes with smack. This patch fixes just to ignore
> private inode including anon_inode for smack_file_receive.
>
> Signed-off-by: Seung-Woo Kim <sw0312.kim@...sung.com>

Acked-by: Casey Schaufler <casey@...aufler-ca.com>
Applied to git@...hub.com:cschaufler/smack-next.git smack-for-4.2

> ---
>  security/smack/smack_lsm.c |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
>
> diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
> index 69fdc38..d1bb411 100644
> --- a/security/smack/smack_lsm.c
> +++ b/security/smack/smack_lsm.c
> @@ -1673,6 +1673,9 @@ static int smack_file_receive(struct file *file)
>  	struct smk_audit_info ad;
>  	struct inode *inode = file_inode(file);
>  
> +	if (unlikely(IS_PRIVATE(inode)))
> +		return 0;
> +
>  	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
>  	smk_ad_setfield_u_fs_path(&ad, file->f_path);
>  	/*

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