.mount = ramfs_mount, .kill_sb = ramfs_kill_sb, .fs_flags = FS_USERNS_MOUNT, }; 2.2 ramfs_mount struct dentry *ramfs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) { return mount_nodev(fs_type, flags, data, ramfs_fill_super); } int ra...
.name = "tmpfs", .mount = shmem_mount, .kill_sb = kill_litter_super, .fs_flags = FS_USERNS_MOUNT, }; int __init shmem_init(void) { int error; shmem_init_inodecache(); error = register_filesystem(&shmem_fs_type); shm_mnt = kern_mount(&shmem_fs_type); return 0; } kern_o...
mount()函数触发SyS_mount系统调用,并最终进入内核sget_userns函数校验此时的fs_flags值是否为FS_USERNS_MOUNT,以及是否具备CAP_SYS_ADMIN的权限,此处校验通过,Overlayfs正常挂载。//include/linux/fs.h#define FS_USERNS_MOUNT 8 /* Can be mounted by userns root *///fs/super.cstruct...
使用默认配置的ubuntu.所有版本存在该cve-2015-1328漏洞,允许本地root特权提升,当在upper文件系统目录中创建新文件时,overlayfs文件系统并不能恰当检查文件权限 该漏洞能被某非特权进程利用,此进程在内核中(带有CONFIG_USER_NS=y、且其位置的overlayfs带有FS_USERNS_MOUNT标志),可让挂载的overlayfs在非特权的目录中挂...
struct file_system_type{constchar*name;//文件系统的名字int fs_flags;#defineFS_REQUIRES_DEV1#defineFS_BINARY_MOUNTDATA2#defineFS_HAS_SUBTYPE4#defineFS_USERNS_MOUNT8/* Can be mounted by userns root */#defineFS_RENAME_DOES_D_MOVE32768/* FS will handle d_move() during rename() internally....
(http://people.canonical.com/~ubuntu-security/cve/2015/CVE-2015-1328.html) *=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=* CVE-2015-1328 / ofs.c overlayfs incorrect permission handling + FS_USERNS_MOUNT user@ubuntu-server-1504:~$ uname -a Linux...
during mountpoint lookups or walking back * up the tree. * * It should be taken for write in all cases where the vfsmount * tree or hash is modified or when a vfsmount structure is modified. */ DEFINE_BRLOCK(vfsmount_lock); static inline unsigned long hash(struct vfsmount *mnt, ...
* @mnt_userns: The user namespace of the mount * @idmap: The idmap of the mount * @dir: inode that is being unlinked * @dentry: dentry that is being unlinked * @omode: mode for new directory * */ static int v9fs_vfs_mkdir_dotl(struct user_namespace *mnt_userns, static int v9...
所在目录如果有merged目录,通常这一层称之这联合挂载点 (union mount) work目录是OverlayFS内部使用 具体说明,如下 l (小L)目录解释 切换至/var/lib/docker/overlay2目录下 <root@SIT-K8S-WN6 /data/docker/overlay2># ls由于主机上的container过多,删除了一部分 74dd890cbb4f6d8ef246d6a5412683d1badd7...
|d_parent: struct dentry *; | |mnt_mountpoint: struct dentry*; | |d_name: struct qstr; | |vfs_inode: struct inode; | |d_inode: struct inode*; ---+--->|+-struct inode ---+| |d_op: struct dentry_operations*;| ||i_op: struct inode_operations*;|| |d_sb: struct super_...