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[PATCH 3/6] ioctl: check for capabilities in the current user namespace

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: [PATCH 3/6] ioctl: check for capabilities in the current user namespace
From: Dwight Engen <dwight.engen@xxxxxxxxxx>
Date: Fri, 28 Jun 2013 11:11:19 -0400
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxx>, xfs@xxxxxxxxxxx, Serge Hallyn <serge.hallyn@xxxxxxxxxx>, Brian Foster <bfoster@xxxxxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20130626020924.GD29376@dastard>
Organization: Oracle Corporation
References: <20130619110948.0bfafa2b@xxxxxxxxxx> <20130620001341.GM29338@dastard> <20130620095410.1917d235@xxxxxxxxxx> <20130620220311.GT29376@dastard> <20130621111420.5592707e@xxxxxxxxxx> <20130624003316.GH29376@dastard> <20130624091035.6274800f@xxxxxxxxxx> <20130626020924.GD29376@dastard>
Use inode_capable() to check if SUID|SGID bits should be cleared to match
similar check in inode_change_ok().

The check for CAP_LINUX_IMMUTABLE was not modified since all other file
systems also check against init_user_ns rather than current_user_ns.

Signed-off-by: Dwight Engen <dwight.engen@xxxxxxxxxx>
---
 fs/xfs/xfs_ioctl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 5e99968..bedf510 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -981,7 +981,7 @@ xfs_ioctl_setattr(
         * to the file owner ID, except in cases where the
         * CAP_FSETID capability is applicable.
         */
-       if (current_fsuid() != ip->i_d.di_uid && !capable(CAP_FOWNER)) {
+       if (!inode_owner_or_capable(VFS_I(ip))) {
                code = XFS_ERROR(EPERM);
                goto error_return;
        }
@@ -1103,7 +1103,7 @@ xfs_ioctl_setattr(
                 * cleared upon successful return from chown()
                 */
                if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) &&
-                   !capable(CAP_FSETID))
+                   !inode_capable(VFS_I(ip), CAP_FSETID))
                        ip->i_d.di_mode &= ~(S_ISUID|S_ISGID);
 
                /*
-- 
1.8.1.4

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