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authorDwight Engen <dwight.engen@oracle.com>2013-08-15 14:08:00 -0400
committerBen Myers <bpm@sgi.com>2013-08-15 14:19:25 -0500
commitfd5e2aa8653665ae1cc60f7aca1069abdbcad3f6 (patch)
tree5d05c2c4190f30534f866ef881a8391bc7ea322c
parent288bbe0eeb3da7238482ca586c6fb029801336be (diff)
xfs: ioctl check for capabilities in the current user namespace
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. Only allow changing of projid from init_user_ns. Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Gao feng <gaofeng@cn.fujitsu.com> Signed-off-by: Dwight Engen <dwight.engen@oracle.com> Signed-off-by: Ben Myers <bpm@sgi.com>
-rw-r--r--fs/xfs/xfs_ioctl.c11
-rw-r--r--kernel/capability.c1
2 files changed, 10 insertions, 2 deletions
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index e9c17e2ed6d7..999c1efd6af5 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -1015,15 +1015,22 @@ 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;
}
/*
* Do a quota reservation only if projid is actually going to change.
+ * Only allow changing of projid from init_user_ns since it is a
+ * non user namespace aware identifier.
*/
if (mask & FSX_PROJID) {
+ if (current_user_ns() != &init_user_ns) {
+ code = XFS_ERROR(EINVAL);
+ goto error_return;
+ }
+
if (XFS_IS_QUOTA_RUNNING(mp) &&
XFS_IS_PQUOTA_ON(mp) &&
xfs_get_projid(ip) != fa->fsx_projid) {
@@ -1137,7 +1144,7 @@ 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 f6c2ce5701e1..a4b67446dc87 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);