linux-kernel - [PATCH] powerpc/spufs: convert userns uid/gid mount options to kuid/kgid

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Date:	Wed, 21 Aug 2013 14:33:51 -0400
From:	Dwight Engen <dwight.engen@...cle.com>
To:	Ben Myers <bpm@....com>
Cc:	Jeremy Kerr <jk@...abs.org>, cbe-oss-dev@...ts.ozlabs.org,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Arnd Bergmann <arnd@...db.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linux-kernel@...r.kernel.org, xfs@....sgi.com,
	linux-next@...r.kernel.org, Gao feng <gaofeng@...fujitsu.com>,
	linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH] powerpc/spufs: convert userns uid/gid mount options to
 kuid/kgid

Acked-by: Jeremy Kerr <jk@...abs.org>
Tested-by: Jeremy Kerr <jk@...abs.org>
Signed-off-by: Dwight Engen <dwight.engen@...cle.com>
---
 arch/powerpc/platforms/cell/spufs/inode.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/platforms/cell/spufs/inode.c b/arch/powerpc/platforms/cell/spufs/inode.c
index f390042..87ba7cf 100644
--- a/arch/powerpc/platforms/cell/spufs/inode.c
+++ b/arch/powerpc/platforms/cell/spufs/inode.c
@@ -620,12 +620,16 @@ spufs_parse_options(struct super_block *sb, char *options, struct inode *root)
 		case Opt_uid:
 			if (match_int(&args[0], &option))
 				return 0;
-			root->i_uid = option;
+			root->i_uid = make_kuid(current_user_ns(), option);
+			if (!uid_valid(root->i_uid))
+				return 0;
 			break;
 		case Opt_gid:
 			if (match_int(&args[0], &option))
 				return 0;
-			root->i_gid = option;
+			root->i_gid = make_kgid(current_user_ns(), option);
+			if (!gid_valid(root->i_gid))
+				return 0;
 			break;
 		case Opt_mode:
 			if (match_octal(&args[0], &option))
-- 
1.8.1.4

On Wed, 21 Aug 2013 10:56:54 -0500
Ben Myers <bpm@....com> wrote:

> Hey Dwight,
> 
> On Wed, Aug 21, 2013 at 02:30:04PM +0800, Jeremy Kerr wrote:
> > > Yes, I agree. The other filesystems that take an Opt_uid as well
> > > do use current_user_ns() and not init_user_ns. They also do a
> > > uid_valid() check and fail the mount (or fallback to
> > > GLOBAL_ROOT_UID). So I think that would look like this:
> > 
> > Looks good to me. Builds and mounts as expected.
> > 
> > Acked-by: Jeremy Kerr <jk@...abs.org>
> 
> Could you repost this patch with the right subject and a commit
> header?  Given Jeremy's Ack I think we could proceed to pull this in.

Sure, I just wanted to make sure someone had tested it first, which it
looks like Jeremy did, thanks.

> Regards,
> 	Ben

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