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[PATCH v7 3/7] xfs: ioctl check for capabilities in the current user nam

To: xfs@xxxxxxxxxxx
Subject: [PATCH v7 3/7] xfs: ioctl check for capabilities in the current user namespace
From: Dwight Engen <dwight.engen@xxxxxxxxxx>
Date: Mon, 29 Jul 2013 23:06:50 -0400
Delivered-to: xfs@xxxxxxxxxxx
Organization: Oracle Corporation
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.

Reviewed-by: Dave Chinner <dchinner@xxxxxxxxxx>
Signed-off-by: Dwight Engen <dwight.engen@xxxxxxxxxx>
---
 fs/xfs/xfs_ioctl.c  | 4 ++--
 kernel/capability.c | 1 +
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 6e2bca5..8edc780 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);
 
                /*
diff --git a/kernel/capability.c b/kernel/capability.c
index f6c2ce5..a4b6744 100644
--- a/kernel/capability.c
+++ b/kernel/capability.c
@@ -464,3 +464,4 @@ bool inode_capable(const struct inode *inode, int cap)
 
        return ns_capable(ns, cap) && kuid_has_mapping(ns, inode->i_uid);
 }
+EXPORT_SYMBOL(inode_capable);
-- 
1.8.1.4

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