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-rw-r--r--fs/inode.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/inode.c b/fs/inode.c
index ba2bafa22885..30b720cffd9c 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -2214,6 +2214,19 @@ int vfs_ioc_fssetxattr_check(struct inode *inode, const struct fsxattr *old_fa,
!capable(CAP_LINUX_IMMUTABLE))
return -EPERM;
+ /*
+ * Project Quota ID state is only allowed to change from within the init
+ * namespace. Enforce that restriction only if we are trying to change
+ * the quota ID state. Everything else is allowed in user namespaces.
+ */
+ if (current_user_ns() != &init_user_ns) {
+ if (old_fa->fsx_projid != fa->fsx_projid)
+ return -EINVAL;
+ if ((old_fa->fsx_xflags ^ fa->fsx_xflags) &
+ FS_XFLAG_PROJINHERIT)
+ return -EINVAL;
+ }
+
return 0;
}
EXPORT_SYMBOL(vfs_ioc_fssetxattr_check);