linux-kernel - Re: [PATCH 14/13] sysfs: sysfs_setattr remove unnecessary permission check.

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Message-ID: <20091104142515.GC4355@us.ibm.com>
Date:	Wed, 4 Nov 2009 08:25:15 -0600
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	Kay Sievers <kay.sievers@...y.org>, Greg KH <greg@...ah.com>,
	linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	linux-fsdevel@...r.kernel.org,
	Eric Dumazet <eric.dumazet@...il.com>,
	Benjamin LaHaise <bcrl@...et.ca>
Subject: Re: [PATCH 14/13] sysfs: sysfs_setattr remove unnecessary
	permission check.

Quoting Eric W. Biederman (ebiederm@...ssion.com):
> 
> inode_change_ok already clears the SGID bit when necessary so there is
> no reason for sysfs_setattr to carry code to do the same, and it is
> good to kill the extra copy because when I moved the code, I goofed
> and in certain corner cases the code will look at the wrong gid.
> 
> Signed-off-by: Eric W. Biederman <ebiederm@...stanetworks.com>

Acked-by: Serge Hallyn <serue@...ibm.com>

> ---
>  fs/sysfs/inode.c |    4 ----
>  1 files changed, 0 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
> index 72e2e99..e2595a7 100644
> --- a/fs/sysfs/inode.c
> +++ b/fs/sysfs/inode.c
> @@ -120,10 +120,6 @@ int sysfs_setattr(struct dentry * dentry, struct iattr * iattr)
>  		return error;
> 
>  	iattr->ia_valid &= ~ATTR_SIZE; /* ignore size changes */
> -	if (iattr->ia_valid & ATTR_MODE) {
> -		if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
> -			iattr->ia_mode &= ~S_ISGID;
> -	}
> 
>  	error = inode_setattr(inode, iattr);
>  	if (error)
> -- 
> 1.6.5.2.143.g8cc62
> 
> --
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