linux-kernel - [RFC] [PATCH -mm] reiser4: replace uid==0 check with capability

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Date:	Wed, 12 Dec 2007 15:01:07 -0600
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Linux Containers <containers@...ts.osdl.org>,
	lkml <linux-kernel@...r.kernel.org>, reiserfs-dev@...esys.com,
	reiserfs-devel@...r.kernel.org
Subject: [RFC] [PATCH -mm] reiser4: replace uid==0 check with capability

>From c257cb67ce00c8769730cfa92379a53009d99b28 Mon Sep 17 00:00:00 2001
From: serue@...ibm.com <serue@...ibm.com>
Date: Wed, 5 Dec 2007 14:02:45 -0800
Subject: [RFC] [PATCH -mm] reiser4: replace uid==0 check with capability

Reiser4 gives root some reserved blocks.  Replace the uid==0 check, which
is not safe in the face of user namespaces, with a CAP_SYS_RESOURCE check,
which seems appropriate.

The per-uid and per-guid reservations appear unimplemented so I'm ignoring
them.

Signed-off-by: Serge Hallyn <serue@...ibm.com>
---
 fs/reiser4/super.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/reiser4/super.c b/fs/reiser4/super.c
index bc4113e..50e3d09 100644
--- a/fs/reiser4/super.c
+++ b/fs/reiser4/super.c
@@ -144,7 +144,7 @@ long reiser4_reserved_blocks(const struct super_block *super	/* super block
 		reserved += reserved_for_gid(super, gid);
 	if (REISER4_SUPPORT_UID_SPACE_RESERVATION)
 		reserved += reserved_for_uid(super, uid);
-	if (REISER4_SUPPORT_ROOT_SPACE_RESERVATION && (uid == 0))
+	if (REISER4_SUPPORT_ROOT_SPACE_RESERVATION && capable(CAP_SYS_RESOURCE))
 		reserved += reserved_for_root(super);
 	return reserved;
 }
-- 
1.5.1

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