Re: [RFC PATCH 0/2] Loop device psuedo filesystem

[Seth Forshee]

On Tue, Sep 16, 2014 at 12:12:47PM -0400, Shea Levy wrote:
> OK, compiling with BLK_DEV_LOOP=y (on top of 3.16.2), I was able to
> mount loopfs, request a loop device from loop-control, and associate it
> with an image with an ext4 partition with losetup, but mount still gives
> EPERM (all as root in a userns started from an unprivileged account). Is
> this expected? I do have read and write permissions to the resultant
> loop device. If this is expected, what would be needed to be able to
> mount the device?

Yes. Very few filesystems allow mounting from a userns right now, and
probably no "regular" filesystems do, only special filesystems like
sysfs. At minimum you'll need to add the FS_USERNS_MOUNT flag to any
filesystems you want to use, but even then the user/group ids probably
won't be translated into the userns.

> Also, this isn't an issue exactly, but the free devices started at 8
> (presumably because I have /dev/loop[0-7]) and appear in /dev in the
> root ns (presumably via udev) until I unmounted.

Right. 0-7 get created at module init time and end up allocated to the
init_user_ns superblock, so the first "free" id for your ns is 8.

I've brought up the problem of the devices for the userns also showing
up in devtmpfs. It was dismissed as not really being an issue, though I
still don't agree with that viewpoint. My proposed solution of assigning
devices to namespaces and then creating a namespaced devtmpfs was
rejected as well.

Just so you know, I'm not doing any further development of these patches
right now. I've shifted my efforts to getting fuse mountable from user
namespaces (https://lkml.org/lkml/2014/9/12/367).

Seth

> 
> ~Shea
> 
> On Mon, Sep 15, 2014 at 07:20:52PM -0400, Shea Levy wrote:
> > Hi Seth,
> > 
> > I applied your patches to 3.15-rc7, and had the same problem, the build
> > fails with:
> > 
> > > make[3]: *** No rule to make target `fs/loopfs/loopfs.c', needed by `fs/loopfs/loopfs.o'.  Stop.
> > 
> > I've attached the config I used, I generated it via make allnoconfig and
> > then enabled MODULES, BLK, BLK_DEV, and BLK_DEV_LOOP=m in make nconfig.
> > 
> > The build succeeds if I set BLK_DEV_LOOP=y, so I'll go ahead with my
> > testing using that.
> > 
> > ~Shea
> > 
> > On Mon, Sep 15, 2014 at 03:55:32PM -0500, Seth Forshee wrote:
> > > On Mon, Sep 15, 2014 at 04:38:44PM -0400, Shea Levy wrote:
> > > > Hi,
> > > > 
> > > > I wanted to test these patches (to support creating and filling a disk
> > > > image containing a btrfs filesystem and several subvolumes as an
> > > > unprivileged user), but the build fails due to what looks like a missing
> > > > loopfs.c in fs/loopfs (or alternatively an erroneous line in
> > > > fs/loopfs/Makefile). I built based off of 3.17-rc5.
> > > 
> > > There's no loopfs.c, loopfs.o gets built from inode.o which is in turn
> > > built from inode.c. I'm pretty sure the patches built when I posted
> > > them, which seems to be 3.15-rc7 based on the branch I've got here.
> > > 
> > > Seth
> > > 
> > > > 
> > > > ~Shea
> > > > 
> > > > 
> > > > On Tue, May 27, 2014 at 11:58:54PM +0200, Seth Forshee wrote:
> > > > > I'm posting these patches in response to the ongoing discussion of loop
> > > > > devices in containers at [1].
> > > > > 
> > > > > The patches implement a psuedo filesystem for loop devices, which will
> > > > > allow use of loop devices in containters using standard utilities. Under
> > > > > normal use a loopfs mount will initially contain a single device node
> > > > > for loop-control which can be used to request and release loop devices.
> > > > > Any devices allocated via this node will automatically appear in that
> > > > > loopfs mount (and in devtmpfs) but not in any other loopfs mounts.
> > > > > CAP_SYS_ADMIN in the userns of the process which performed the mount is
> > > > > allowed to perform privileged loop ioctls on these devices.
> > > > > 
> > > > > Alternately loopfs can be mounted with the hostmount option, intended
> > > > > for mounting /dev/loop in the host. This is the default mount for any
> > > > > devices not created via loop-control in a loopfs mount (e.g. devices
> > > > > created during driver init, devices created via /dev/loop-control, etc).
> > > > > This is only available to system-wide CAP_SYS_ADMIN.
> > > > > 
> > > > > I still have some testing to do on these patches, but they work at
> > > > > minimum for simple use cases. It's possible to use an unmodified losetup
> > > > > if it's new enough to know about loop-control, with a couple of caveats:
> > > > > 
> > > > >  * /dev/loop-control must be symlinked to /dev/loop/loop-control
> > > > >  * In some cases losetup attempts to use /dev/loopN when the device node
> > > > >    is at /dev/loop/N. For example, 'losetup -f disk.img' fails.
> > > > > 
> > > > > Device nodes for loop partitions are not created in loopfs. These
> > > > > devices are created by the generic block layer, and the loop driver has
> > > > > no way of knowing when they are created, so some kind of hook into the
> > > > > driver will be needed to support this.
> > > > > 
> > > > > Thanks,
> > > > > Seth
> > > > > 
> > > > > [1] http://article.gmane.org/gmane.linux.kernel/1703988
> > > > > 
> > > > > Seth Forshee (2):
> > > > >   loop: Add loop filesystem
> > > > >   loop: Permit priveleged operations within user namespaces
> > > > > 
> > > > >  drivers/block/loop.c       | 137 +++++++++++++----
> > > > >  drivers/block/loop.h       |   2 +
> > > > >  fs/Makefile                |   1 +
> > > > >  fs/loopfs/Makefile         |   6 +
> > > > >  fs/loopfs/inode.c          | 360 +++++++++++++++++++++++++++++++++++++++++++++
> > > > >  include/linux/loopfs.h     |  53 +++++++
> > > > >  include/uapi/linux/magic.h |   1 +
> > > > >  7 files changed, 535 insertions(+), 25 deletions(-)
> > > > >  create mode 100644 fs/loopfs/Makefile
> > > > >  create mode 100644 fs/loopfs/inode.c
> > > > >  create mode 100644 include/linux/loopfs.h
> > > > > 
> > > > > --
> > > > > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> > > > > the body of a message to majordomo@xxxxxxxxxxxxxxx
> > > > > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > > > > Please read the FAQ at  http://www.tux.org/lkml/
> > > > > 
> > > > > 
> 
> > #
> > # Automatically generated file; DO NOT EDIT.
> > # Linux/x86 3.15.0-rc7 Kernel Configuration
> > #
> > CONFIG_64BIT=y
> > CONFIG_X86_64=y
> > CONFIG_X86=y
> > CONFIG_INSTRUCTION_DECODER=y
> > CONFIG_OUTPUT_FORMAT="elf64-x86-64"
> > CONFIG_ARCH_DEFCONFIG="arch/x86/configs/x86_64_defconfig"
> > CONFIG_LOCKDEP_SUPPORT=y
> > CONFIG_STACKTRACE_SUPPORT=y
> > CONFIG_HAVE_LATENCYTOP_SUPPORT=y
> > CONFIG_MMU=y
> > CONFIG_NEED_DMA_MAP_STATE=y
> > CONFIG_NEED_SG_DMA_LENGTH=y
> > CONFIG_GENERIC_ISA_DMA=y
> > CONFIG_GENERIC_HWEIGHT=y
> > CONFIG_ARCH_MAY_HAVE_PC_FDC=y
> > CONFIG_RWSEM_XCHGADD_ALGORITHM=y
> > CONFIG_GENERIC_CALIBRATE_DELAY=y
> > CONFIG_ARCH_HAS_CPU_RELAX=y
> > CONFIG_ARCH_HAS_CACHE_LINE_SIZE=y
> > CONFIG_HAVE_SETUP_PER_CPU_AREA=y
> > CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK=y
> > CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK=y
> > CONFIG_ARCH_HIBERNATION_POSSIBLE=y
> > CONFIG_ARCH_SUSPEND_POSSIBLE=y
> > CONFIG_ARCH_WANT_HUGE_PMD_SHARE=y
> > CONFIG_ARCH_WANT_GENERAL_HUGETLB=y
> > CONFIG_ZONE_DMA32=y
> > CONFIG_AUDIT_ARCH=y
> > CONFIG_ARCH_SUPPORTS_OPTIMIZED_INLINING=y
> > CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC=y
> > CONFIG_ARCH_HWEIGHT_CFLAGS="-fcall-saved-rdi -fcall-saved-rsi -fcall-saved-rdx -fcall-saved-rcx -fcall-saved-r8 -fcall-saved-r9 -fcall-saved-r10 -fcall-saved-r11"
> > CONFIG_ARCH_SUPPORTS_UPROBES=y
> > CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config"
> > CONFIG_IRQ_WORK=y
> > CONFIG_BUILDTIME_EXTABLE_SORT=y
> > 
> > #
> > # General setup
> > #
> > CONFIG_BROKEN_ON_SMP=y
> > CONFIG_INIT_ENV_ARG_LIMIT=32
> > CONFIG_CROSS_COMPILE=""
> > # CONFIG_COMPILE_TEST is not set
> > CONFIG_LOCALVERSION=""
> > # CONFIG_LOCALVERSION_AUTO is not set
> > CONFIG_HAVE_KERNEL_GZIP=y
> > CONFIG_HAVE_KERNEL_BZIP2=y
> > CONFIG_HAVE_KERNEL_LZMA=y
> > CONFIG_HAVE_KERNEL_XZ=y
> > CONFIG_HAVE_KERNEL_LZO=y
> > CONFIG_HAVE_KERNEL_LZ4=y
> > CONFIG_KERNEL_GZIP=y
> > # CONFIG_KERNEL_BZIP2 is not set
> > # CONFIG_KERNEL_LZMA is not set
> > # CONFIG_KERNEL_XZ is not set
> > # CONFIG_KERNEL_LZO is not set
> > # CONFIG_KERNEL_LZ4 is not set
> > CONFIG_DEFAULT_HOSTNAME="(none)"
> > CONFIG_SWAP=y
> > # CONFIG_SYSVIPC is not set
> > # CONFIG_FHANDLE is not set
> > # CONFIG_USELIB is not set
> > CONFIG_HAVE_ARCH_AUDITSYSCALL=y
> > 
> > #
> > # IRQ subsystem
> > #
> > CONFIG_GENERIC_IRQ_PROBE=y
> > CONFIG_GENERIC_IRQ_SHOW=y
> > CONFIG_IRQ_FORCED_THREADING=y
> > CONFIG_SPARSE_IRQ=y
> > CONFIG_CLOCKSOURCE_WATCHDOG=y
> > CONFIG_ARCH_CLOCKSOURCE_DATA=y
> > CONFIG_GENERIC_TIME_VSYSCALL=y
> > CONFIG_GENERIC_CLOCKEVENTS=y
> > CONFIG_GENERIC_CLOCKEVENTS_BUILD=y
> > CONFIG_GENERIC_CLOCKEVENTS_BROADCAST=y
> > CONFIG_GENERIC_CLOCKEVENTS_MIN_ADJUST=y
> > CONFIG_GENERIC_CMOS_UPDATE=y
> > 
> > #
> > # Timers subsystem
> > #
> > CONFIG_HZ_PERIODIC=y
> > # CONFIG_NO_HZ_IDLE is not set
> > # CONFIG_NO_HZ is not set
> > # CONFIG_HIGH_RES_TIMERS is not set
> > 
> > #
> > # CPU/Task time and stats accounting
> > #
> > CONFIG_TICK_CPU_ACCOUNTING=y
> > # CONFIG_VIRT_CPU_ACCOUNTING_GEN is not set
> > # CONFIG_IRQ_TIME_ACCOUNTING is not set
> > # CONFIG_BSD_PROCESS_ACCT is not set
> > 
> > #
> > # RCU Subsystem
> > #
> > CONFIG_TINY_RCU=y
> > # CONFIG_PREEMPT_RCU is not set
> > # CONFIG_RCU_STALL_COMMON is not set
> > # CONFIG_TREE_RCU_TRACE is not set
> > # CONFIG_IKCONFIG is not set
> > CONFIG_LOG_BUF_SHIFT=17
> > CONFIG_HAVE_UNSTABLE_SCHED_CLOCK=y
> > CONFIG_ARCH_SUPPORTS_NUMA_BALANCING=y
> > CONFIG_ARCH_SUPPORTS_INT128=y
> > CONFIG_ARCH_WANTS_PROT_NUMA_PROT_NONE=y
> > # CONFIG_CGROUPS is not set
> > # CONFIG_CHECKPOINT_RESTORE is not set
> > # CONFIG_NAMESPACES is not set
> > # CONFIG_SCHED_AUTOGROUP is not set
> > # CONFIG_RELAY is not set
> > # CONFIG_BLK_DEV_INITRD is not set
> > # CONFIG_CC_OPTIMIZE_FOR_SIZE is not set
> > CONFIG_ANON_INODES=y
> > CONFIG_SYSCTL_EXCEPTION_TRACE=y
> > CONFIG_HAVE_PCSPKR_PLATFORM=y
> > CONFIG_EXPERT=y
> > # CONFIG_SYSFS_SYSCALL is not set
> > # CONFIG_KALLSYMS is not set
> > # CONFIG_PRINTK is not set
> > # CONFIG_BUG is not set
> > # CONFIG_PCSPKR_PLATFORM is not set
> > # CONFIG_BASE_FULL is not set
> > # CONFIG_FUTEX is not set
> > # CONFIG_EPOLL is not set
> > # CONFIG_SIGNALFD is not set
> > # CONFIG_TIMERFD is not set
> > # CONFIG_EVENTFD is not set
> > # CONFIG_SHMEM is not set
> > # CONFIG_AIO is not set
> > CONFIG_EMBEDDED=y
> > CONFIG_HAVE_PERF_EVENTS=y
> > 
> > #
> > # Kernel Performance Events And Counters
> > #
> > CONFIG_PERF_EVENTS=y
> > # CONFIG_DEBUG_PERF_USE_VMALLOC is not set
> > # CONFIG_VM_EVENT_COUNTERS is not set
> > # CONFIG_COMPAT_BRK is not set
> > # CONFIG_SLAB is not set
> > CONFIG_SLUB=y
> > # CONFIG_SLOB is not set
> > # CONFIG_PROFILING is not set
> > CONFIG_HAVE_OPROFILE=y
> > CONFIG_OPROFILE_NMI_TIMER=y
> > # CONFIG_KPROBES is not set
> > # CONFIG_JUMP_LABEL is not set
> > # CONFIG_UPROBES is not set
> > # CONFIG_HAVE_64BIT_ALIGNED_ACCESS is not set
> > CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS=y
> > CONFIG_ARCH_USE_BUILTIN_BSWAP=y
> > CONFIG_HAVE_IOREMAP_PROT=y
> > CONFIG_HAVE_KPROBES=y
> > CONFIG_HAVE_KRETPROBES=y
> > CONFIG_HAVE_OPTPROBES=y
> > CONFIG_HAVE_KPROBES_ON_FTRACE=y
> > CONFIG_HAVE_ARCH_TRACEHOOK=y
> > CONFIG_HAVE_DMA_ATTRS=y
> > CONFIG_GENERIC_SMP_IDLE_THREAD=y
> > CONFIG_HAVE_REGS_AND_STACK_ACCESS_API=y
> > CONFIG_HAVE_DMA_API_DEBUG=y
> > CONFIG_HAVE_HW_BREAKPOINT=y
> > CONFIG_HAVE_MIXED_BREAKPOINTS_REGS=y
> > CONFIG_HAVE_USER_RETURN_NOTIFIER=y
> > CONFIG_HAVE_PERF_EVENTS_NMI=y
> > CONFIG_HAVE_PERF_REGS=y
> > CONFIG_HAVE_PERF_USER_STACK_DUMP=y
> > CONFIG_HAVE_ARCH_JUMP_LABEL=y
> > CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG=y
> > CONFIG_HAVE_ALIGNED_STRUCT_PAGE=y
> > CONFIG_HAVE_CMPXCHG_LOCAL=y
> > CONFIG_HAVE_CMPXCHG_DOUBLE=y
> > CONFIG_HAVE_ARCH_SECCOMP_FILTER=y
> > CONFIG_HAVE_CC_STACKPROTECTOR=y
> > # CONFIG_CC_STACKPROTECTOR is not set
> > CONFIG_CC_STACKPROTECTOR_NONE=y
> > # CONFIG_CC_STACKPROTECTOR_REGULAR is not set
> > # CONFIG_CC_STACKPROTECTOR_STRONG is not set
> > CONFIG_HAVE_CONTEXT_TRACKING=y
> > CONFIG_HAVE_VIRT_CPU_ACCOUNTING_GEN=y
> > CONFIG_HAVE_IRQ_TIME_ACCOUNTING=y
> > CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE=y
> > CONFIG_HAVE_ARCH_SOFT_DIRTY=y
> > CONFIG_MODULES_USE_ELF_RELA=y
> > CONFIG_HAVE_IRQ_EXIT_ON_IRQ_STACK=y
> > 
> > #
> > # GCOV-based kernel profiling
> > #
> > # CONFIG_HAVE_GENERIC_DMA_COHERENT is not set
> > CONFIG_BASE_SMALL=1
> > CONFIG_MODULES=y
> > # CONFIG_MODULE_FORCE_LOAD is not set
> > # CONFIG_MODULE_UNLOAD is not set
> > # CONFIG_MODVERSIONS is not set
> > # CONFIG_MODULE_SRCVERSION_ALL is not set
> > # CONFIG_MODULE_SIG is not set
> > CONFIG_BLOCK=y
> > CONFIG_BLK_DEV_BSG=y
> > # CONFIG_BLK_DEV_BSGLIB is not set
> > # CONFIG_BLK_DEV_INTEGRITY is not set
> > # CONFIG_BLK_CMDLINE_PARSER is not set
> > 
> > #
> > # Partition Types
> > #
> > # CONFIG_PARTITION_ADVANCED is not set
> > CONFIG_MSDOS_PARTITION=y
> > CONFIG_EFI_PARTITION=y
> > 
> > #
> > # IO Schedulers
> > #
> > CONFIG_IOSCHED_NOOP=y
> > CONFIG_IOSCHED_DEADLINE=y
> > CONFIG_IOSCHED_CFQ=y
> > # CONFIG_DEFAULT_DEADLINE is not set
> > CONFIG_DEFAULT_CFQ=y
> > # CONFIG_DEFAULT_NOOP is not set
> > CONFIG_DEFAULT_IOSCHED="cfq"
> > CONFIG_INLINE_SPIN_UNLOCK_IRQ=y
> > CONFIG_INLINE_READ_UNLOCK=y
> > CONFIG_INLINE_READ_UNLOCK_IRQ=y
> > CONFIG_INLINE_WRITE_UNLOCK=y
> > CONFIG_INLINE_WRITE_UNLOCK_IRQ=y
> > # CONFIG_FREEZER is not set
> > 
> > #
> > # Processor type and features
> > #
> > # CONFIG_ZONE_DMA is not set
> > # CONFIG_SMP is not set
> > CONFIG_X86_MPPARSE=y
> > # CONFIG_X86_EXTENDED_PLATFORM is not set
> > # CONFIG_SCHED_OMIT_FRAME_POINTER is not set
> > # CONFIG_HYPERVISOR_GUEST is not set
> > CONFIG_NO_BOOTMEM=y
> > # CONFIG_MEMTEST is not set
> > # CONFIG_M486 is not set
> > # CONFIG_M586 is not set
> > # CONFIG_M586TSC is not set
> > # CONFIG_M586MMX is not set
> > # CONFIG_M686 is not set
> > # CONFIG_MPENTIUMII is not set
> > # CONFIG_MPENTIUMIII is not set
> > # CONFIG_MPENTIUMM is not set
> > # CONFIG_MPENTIUM4 is not set
> > # CONFIG_MK6 is not set
> > # CONFIG_MK7 is not set
> > # CONFIG_MK8 is not set
> > # CONFIG_MCRUSOE is not set
> > # CONFIG_MEFFICEON is not set
> > # CONFIG_MWINCHIPC6 is not set
> > # CONFIG_MWINCHIP3D is not set
> > # CONFIG_MELAN is not set
> > # CONFIG_MGEODEGX1 is not set
> > # CONFIG_MGEODE_LX is not set
> > # CONFIG_MCYRIXIII is not set
> > # CONFIG_MVIAC3_2 is not set
> > # CONFIG_MVIAC7 is not set
> > # CONFIG_MPSC is not set
> > # CONFIG_MCORE2 is not set
> > # CONFIG_MATOM is not set
> > CONFIG_GENERIC_CPU=y
> > CONFIG_X86_INTERNODE_CACHE_SHIFT=6
> > CONFIG_X86_L1_CACHE_SHIFT=6
> > CONFIG_X86_TSC=y
> > CONFIG_X86_CMPXCHG64=y
> > CONFIG_X86_CMOV=y
> > CONFIG_X86_MINIMUM_CPU_FAMILY=64
> > CONFIG_X86_DEBUGCTLMSR=y
> > # CONFIG_PROCESSOR_SELECT is not set
> > CONFIG_CPU_SUP_INTEL=y
> > CONFIG_CPU_SUP_AMD=y
> > CONFIG_CPU_SUP_CENTAUR=y
> > CONFIG_HPET_TIMER=y
> > # CONFIG_DMI is not set
> > CONFIG_SWIOTLB=y
> > CONFIG_IOMMU_HELPER=y
> > CONFIG_NR_CPUS=1
> > CONFIG_PREEMPT_NONE=y
> > # CONFIG_PREEMPT_VOLUNTARY is not set
> > # CONFIG_PREEMPT is not set
> > CONFIG_X86_LOCAL_APIC=y
> > CONFIG_X86_IO_APIC=y
> > # CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS is not set
> > # CONFIG_X86_MCE is not set
> > # CONFIG_I8K is not set
> > # CONFIG_MICROCODE is not set
> > # CONFIG_MICROCODE_INTEL_EARLY is not set
> > # CONFIG_MICROCODE_AMD_EARLY is not set
> > # CONFIG_X86_MSR is not set
> > # CONFIG_X86_CPUID is not set
> > # CONFIG_NOHIGHMEM is not set
> > # CONFIG_HIGHMEM4G is not set
> > # CONFIG_HIGHMEM64G is not set
> > # CONFIG_VMSPLIT_3G is not set
> > # CONFIG_VMSPLIT_3G_OPT is not set
> > # CONFIG_VMSPLIT_2G is not set
> > # CONFIG_VMSPLIT_2G_OPT is not set
> > # CONFIG_VMSPLIT_1G is not set
> > CONFIG_ARCH_PHYS_ADDR_T_64BIT=y
> > CONFIG_ARCH_DMA_ADDR_T_64BIT=y
> > CONFIG_DIRECT_GBPAGES=y
> > CONFIG_ARCH_SPARSEMEM_ENABLE=y
> > CONFIG_ARCH_SPARSEMEM_DEFAULT=y
> > CONFIG_ARCH_SELECT_MEMORY_MODEL=y
> > CONFIG_ILLEGAL_POINTER_VALUE=0xdead000000000000
> > CONFIG_SELECT_MEMORY_MODEL=y
> > # CONFIG_FLATMEM_MANUAL is not set
> > CONFIG_SPARSEMEM_MANUAL=y
> > CONFIG_SPARSEMEM=y
> > CONFIG_HAVE_MEMORY_PRESENT=y
> > CONFIG_SPARSEMEM_EXTREME=y
> > CONFIG_SPARSEMEM_VMEMMAP_ENABLE=y
> > CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER=y
> > CONFIG_SPARSEMEM_VMEMMAP=y
> > CONFIG_HAVE_MEMBLOCK=y
> > CONFIG_HAVE_MEMBLOCK_NODE_MAP=y
> > CONFIG_ARCH_DISCARD_MEMBLOCK=y
> > # CONFIG_HAVE_BOOTMEM_INFO_NODE is not set
> > # CONFIG_MEMORY_HOTPLUG is not set
> > CONFIG_PAGEFLAGS_EXTENDED=y
> > CONFIG_SPLIT_PTLOCK_CPUS=4
> > CONFIG_ARCH_ENABLE_SPLIT_PMD_PTLOCK=y
> > # CONFIG_COMPACTION is not set
> > CONFIG_PHYS_ADDR_T_64BIT=y
> > CONFIG_ZONE_DMA_FLAG=0
> > CONFIG_VIRT_TO_BUS=y
> > # CONFIG_KSM is not set
> > CONFIG_DEFAULT_MMAP_MIN_ADDR=4096
> > # CONFIG_TRANSPARENT_HUGEPAGE is not set
> > # CONFIG_CROSS_MEMORY_ATTACH is not set
> > CONFIG_NEED_PER_CPU_KM=y
> > # CONFIG_CLEANCACHE is not set
> > # CONFIG_FRONTSWAP is not set
> > # CONFIG_CMA is not set
> > # CONFIG_ZBUD is not set
> > # CONFIG_ZSMALLOC is not set
> > CONFIG_GENERIC_EARLY_IOREMAP=y
> > # CONFIG_X86_CHECK_BIOS_CORRUPTION is not set
> > CONFIG_X86_RESERVE_LOW=64
> > # CONFIG_MTRR is not set
> > # CONFIG_ARCH_RANDOM is not set
> > # CONFIG_X86_SMAP is not set
> > # CONFIG_SECCOMP is not set
> > # CONFIG_HZ_100 is not set
> > CONFIG_HZ_250=y
> > # CONFIG_HZ_300 is not set
> > # CONFIG_HZ_1000 is not set
> > CONFIG_HZ=250
> > # CONFIG_SCHED_HRTICK is not set
> > # CONFIG_KEXEC is not set
> > # CONFIG_CRASH_DUMP is not set
> > CONFIG_PHYSICAL_START=0x1000000
> > # CONFIG_RELOCATABLE is not set
> > CONFIG_PHYSICAL_ALIGN=0x200000
> > # CONFIG_CMDLINE_BOOL is not set
> > CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y
> > 
> > #
> > # Power management and ACPI options
> > #
> > # CONFIG_SUSPEND is not set
> > # CONFIG_HIBERNATION is not set
> > # CONFIG_PM_RUNTIME is not set
> > # CONFIG_SFI is not set
> > 
> > #
> > # CPU Frequency scaling
> > #
> > # CONFIG_CPU_FREQ is not set
> > 
> > #
> > # CPU Idle
> > #
> > # CONFIG_CPU_IDLE is not set
> > # CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED is not set
> > 
> > #
> > # Memory power savings
> > #
> > # CONFIG_I7300_IDLE is not set
> > 
> > #
> > # Bus options (PCI etc.)
> > #
> > # CONFIG_PCI is not set
> > CONFIG_ISA_DMA_API=y
> > # CONFIG_PCCARD is not set
> > # CONFIG_X86_SYSFB is not set
> > 
> > #
> > # Executable file formats / Emulations
> > #
> > # CONFIG_BINFMT_ELF is not set
> > CONFIG_ARCH_BINFMT_ELF_RANDOMIZE_PIE=y
> > # CONFIG_BINFMT_SCRIPT is not set
> > # CONFIG_HAVE_AOUT is not set
> > # CONFIG_BINFMT_MISC is not set
> > # CONFIG_COREDUMP is not set
> > # CONFIG_IA32_EMULATION is not set
> > CONFIG_X86_DEV_DMA_OPS=y
> > # CONFIG_NET is not set
> > CONFIG_HAVE_BPF_JIT=y
> > 
> > #
> > # Device Drivers
> > #
> > 
> > #
> > # Generic Driver Options
> > #
> > CONFIG_UEVENT_HELPER_PATH=""
> > # CONFIG_DEVTMPFS is not set
> > # CONFIG_STANDALONE is not set
> > # CONFIG_PREVENT_FIRMWARE_BUILD is not set
> > # CONFIG_FW_LOADER is not set
> > # CONFIG_DEBUG_DRIVER is not set
> > # CONFIG_DEBUG_DEVRES is not set
> > # CONFIG_SYS_HYPERVISOR is not set
> > # CONFIG_GENERIC_CPU_DEVICES is not set
> > CONFIG_GENERIC_CPU_AUTOPROBE=y
> > # CONFIG_DMA_SHARED_BUFFER is not set
> > 
> > #
> > # Bus devices
> > #
> > # CONFIG_MTD is not set
> > # CONFIG_PARPORT is not set
> > CONFIG_ARCH_MIGHT_HAVE_PC_PARPORT=y
> > CONFIG_BLK_DEV=y
> > # CONFIG_BLK_DEV_NULL_BLK is not set
> > # CONFIG_BLK_DEV_FD is not set
> > # CONFIG_BLK_DEV_COW_COMMON is not set
> > CONFIG_BLK_DEV_LOOP=m
> > CONFIG_BLK_DEV_LOOP_MIN_COUNT=8
> > # CONFIG_BLK_DEV_CRYPTOLOOP is not set
> > 
> > #
> > # DRBD disabled because PROC_FS or INET not selected
> > #
> > # CONFIG_BLK_DEV_RAM is not set
> > # CONFIG_CDROM_PKTCDVD is not set
> > # CONFIG_BLK_DEV_HD is not set
> > 
> > #
> > # Misc devices
> > #
> > # CONFIG_DUMMY_IRQ is not set
> > # CONFIG_ATMEL_SSC is not set
> > # CONFIG_ENCLOSURE_SERVICES is not set
> > # CONFIG_SRAM is not set
> > # CONFIG_C2PORT is not set
> > 
> > #
> > # EEPROM support
> > #
> > # CONFIG_EEPROM_93CX6 is not set
> > 
> > #
> > # Texas Instruments shared transport line discipline
> > #
> > 
> > #
> > # Altera FPGA firmware download module
> > #
> > 
> > #
> > # Intel MIC Host Driver
> > #
> > 
> > #
> > # Intel MIC Card Driver
> > #
> > # CONFIG_INTEL_MIC_CARD is not set
> > # CONFIG_ECHO is not set
> > CONFIG_HAVE_IDE=y
> > # CONFIG_IDE is not set
> > 
> > #
> > # SCSI device support
> > #
> > CONFIG_SCSI_MOD=y
> > # CONFIG_RAID_ATTRS is not set
> > # CONFIG_SCSI is not set
> > # CONFIG_SCSI_DMA is not set
> > # CONFIG_SCSI_NETLINK is not set
> > # CONFIG_ATA is not set
> > # CONFIG_MD is not set
> > # CONFIG_MACINTOSH_DRIVERS is not set
> > 
> > #
> > # Input device support
> > #
> > # CONFIG_INPUT is not set
> > 
> > #
> > # Hardware I/O ports
> > #
> > # CONFIG_SERIO is not set
> > CONFIG_ARCH_MIGHT_HAVE_PC_SERIO=y
> > # CONFIG_GAMEPORT is not set
> > 
> > #
> > # Character devices
> > #
> > # CONFIG_TTY is not set
> > # CONFIG_DEVKMEM is not set
> > # CONFIG_IPMI_HANDLER is not set
> > # CONFIG_HW_RANDOM is not set
> > # CONFIG_NVRAM is not set
> > # CONFIG_RAW_DRIVER is not set
> > # CONFIG_HANGCHECK_TIMER is not set
> > # CONFIG_TCG_TPM is not set
> > # CONFIG_TELCLOCK is not set
> > # CONFIG_I2C is not set
> > # CONFIG_SPI is not set
> > # CONFIG_SPMI is not set
> > # CONFIG_HSI is not set
> > 
> > #
> > # PPS support
> > #
> > # CONFIG_PPS is not set
> > 
> > #
> > # PPS generators support
> > #
> > 
> > #
> > # PTP clock support
> > #
> > 
> > #
> > # Enable PHYLIB and NETWORK_PHY_TIMESTAMPING to see the additional clocks.
> > #
> > CONFIG_ARCH_WANT_OPTIONAL_GPIOLIB=y
> > # CONFIG_GPIOLIB is not set
> > # CONFIG_W1 is not set
> > # CONFIG_POWER_SUPPLY is not set
> > # CONFIG_POWER_AVS is not set
> > # CONFIG_HWMON is not set
> > # CONFIG_THERMAL is not set
> > # CONFIG_WATCHDOG is not set
> > CONFIG_SSB_POSSIBLE=y
> > 
> > #
> > # Sonics Silicon Backplane
> > #
> > # CONFIG_SSB is not set
> > CONFIG_BCMA_POSSIBLE=y
> > 
> > #
> > # Broadcom specific AMBA
> > #
> > # CONFIG_BCMA is not set
> > 
> > #
> > # Multifunction device drivers
> > #
> > # CONFIG_MFD_CORE is not set
> > # CONFIG_MFD_CROS_EC is not set
> > # CONFIG_HTC_PASIC3 is not set
> > # CONFIG_MFD_KEMPLD is not set
> > # CONFIG_MFD_SM501 is not set
> > # CONFIG_ABX500_CORE is not set
> > # CONFIG_MFD_SYSCON is not set
> > # CONFIG_MFD_TI_AM335X_TSCADC is not set
> > # CONFIG_MFD_TMIO is not set
> > # CONFIG_REGULATOR is not set
> > # CONFIG_MEDIA_SUPPORT is not set
> > 
> > #
> > # Graphics support
> > #
> > 
> > #
> > # Direct Rendering Manager
> > #
> > # CONFIG_DRM is not set
> > 
> > #
> > # Frame buffer Devices
> > #
> > # CONFIG_FB is not set
> > # CONFIG_EXYNOS_VIDEO is not set
> > # CONFIG_BACKLIGHT_LCD_SUPPORT is not set
> > # CONFIG_VGASTATE is not set
> > # CONFIG_SOUND is not set
> > CONFIG_USB_OHCI_LITTLE_ENDIAN=y
> > # CONFIG_USB_SUPPORT is not set
> > # CONFIG_MMC is not set
> > # CONFIG_MEMSTICK is not set
> > # CONFIG_NEW_LEDS is not set
> > # CONFIG_ACCESSIBILITY is not set
> > # CONFIG_EDAC is not set
> > CONFIG_RTC_LIB=y
> > # CONFIG_RTC_CLASS is not set
> > # CONFIG_DMADEVICES is not set
> > # CONFIG_AUXDISPLAY is not set
> > # CONFIG_UIO is not set
> > # CONFIG_VIRT_DRIVERS is not set
> > 
> > #
> > # Virtio drivers
> > #
> > # CONFIG_VIRTIO_MMIO is not set
> > 
> > #
> > # Microsoft Hyper-V guest support
> > #
> > # CONFIG_STAGING is not set
> > # CONFIG_X86_PLATFORM_DEVICES is not set
> > # CONFIG_CHROME_PLATFORMS is not set
> > 
> > #
> > # Hardware Spinlock drivers
> > #
> > CONFIG_CLKEVT_I8253=y
> > CONFIG_CLKBLD_I8253=y
> > # CONFIG_SH_TIMER_CMT is not set
> > # CONFIG_SH_TIMER_MTU2 is not set
> > # CONFIG_SH_TIMER_TMU is not set
> > # CONFIG_EM_TIMER_STI is not set
> > # CONFIG_MAILBOX is not set
> > # CONFIG_IOMMU_SUPPORT is not set
> > 
> > #
> > # Remoteproc drivers
> > #
> > # CONFIG_STE_MODEM_RPROC is not set
> > 
> > #
> > # Rpmsg drivers
> > #
> > # CONFIG_PM_DEVFREQ is not set
> > # CONFIG_EXTCON is not set
> > # CONFIG_MEMORY is not set
> > # CONFIG_IIO is not set
> > # CONFIG_PWM is not set
> > # CONFIG_IPACK_BUS is not set
> > # CONFIG_RESET_CONTROLLER is not set
> > # CONFIG_FMC is not set
> > 
> > #
> > # PHY Subsystem
> > #
> > # CONFIG_GENERIC_PHY is not set
> > # CONFIG_PHY_SAMSUNG_USB2 is not set
> > # CONFIG_POWERCAP is not set
> > # CONFIG_MCB is not set
> > 
> > #
> > # Firmware Drivers
> > #
> > # CONFIG_EDD is not set
> > # CONFIG_FIRMWARE_MEMMAP is not set
> > # CONFIG_DELL_RBU is not set
> > # CONFIG_DCDBAS is not set
> > # CONFIG_GOOGLE_FIRMWARE is not set
> > 
> > #
> > # File systems
> > #
> > CONFIG_DCACHE_WORD_ACCESS=y
> > # CONFIG_EXT2_FS is not set
> > # CONFIG_EXT3_FS is not set
> > # CONFIG_EXT4_FS is not set
> > # CONFIG_REISERFS_FS is not set
> > # CONFIG_JFS_FS is not set
> > # CONFIG_XFS_FS is not set
> > # CONFIG_GFS2_FS is not set
> > # CONFIG_BTRFS_FS is not set
> > # CONFIG_NILFS2_FS is not set
> > # CONFIG_FS_POSIX_ACL is not set
> > # CONFIG_FILE_LOCKING is not set
> > # CONFIG_FSNOTIFY is not set
> > # CONFIG_DNOTIFY is not set
> > # CONFIG_INOTIFY_USER is not set
> > # CONFIG_FANOTIFY is not set
> > # CONFIG_QUOTA is not set
> > # CONFIG_QUOTACTL is not set
> > # CONFIG_AUTOFS4_FS is not set
> > # CONFIG_FUSE_FS is not set
> > 
> > #
> > # Caches
> > #
> > # CONFIG_FSCACHE is not set
> > 
> > #
> > # CD-ROM/DVD Filesystems
> > #
> > # CONFIG_ISO9660_FS is not set
> > # CONFIG_UDF_FS is not set
> > 
> > #
> > # DOS/FAT/NT Filesystems
> > #
> > # CONFIG_MSDOS_FS is not set
> > # CONFIG_VFAT_FS is not set
> > # CONFIG_NTFS_FS is not set
> > 
> > #
> > # Pseudo filesystems
> > #
> > # CONFIG_PROC_FS is not set
> > # CONFIG_KERNFS is not set
> > # CONFIG_SYSFS is not set
> > # CONFIG_HUGETLBFS is not set
> > # CONFIG_HUGETLB_PAGE is not set
> > # CONFIG_CONFIGFS_FS is not set
> > # CONFIG_MISC_FILESYSTEMS is not set
> > # CONFIG_NLS is not set
> > 
> > #
> > # Kernel hacking
> > #
> > CONFIG_TRACE_IRQFLAGS_SUPPORT=y
> > 
> > #
> > # printk and dmesg options
> > #
> > CONFIG_DEFAULT_MESSAGE_LOGLEVEL=4
> > 
> > #
> > # Compile-time checks and compiler options
> > #
> > # CONFIG_DEBUG_INFO is not set
> > # CONFIG_ENABLE_WARN_DEPRECATED is not set
> > # CONFIG_ENABLE_MUST_CHECK is not set
> > CONFIG_FRAME_WARN=1024
> > # CONFIG_STRIP_ASM_SYMS is not set
> > # CONFIG_READABLE_ASM is not set
> > # CONFIG_UNUSED_SYMBOLS is not set
> > # CONFIG_DEBUG_FS is not set
> > # CONFIG_HEADERS_CHECK is not set
> > # CONFIG_DEBUG_SECTION_MISMATCH is not set
> > CONFIG_ARCH_WANT_FRAME_POINTERS=y
> > # CONFIG_FRAME_POINTER is not set
> > # CONFIG_DEBUG_FORCE_WEAK_PER_CPU is not set
> > # CONFIG_MAGIC_SYSRQ is not set
> > CONFIG_DEBUG_KERNEL=y
> > 
> > #
> > # Memory Debugging
> > #
> > # CONFIG_DEBUG_PAGEALLOC is not set
> > # CONFIG_DEBUG_OBJECTS is not set
> > CONFIG_HAVE_DEBUG_KMEMLEAK=y
> > # CONFIG_DEBUG_KMEMLEAK is not set
> > # CONFIG_DEBUG_STACK_USAGE is not set
> > # CONFIG_DEBUG_VM is not set
> > # CONFIG_DEBUG_VIRTUAL is not set
> > # CONFIG_DEBUG_MEMORY_INIT is not set
> > CONFIG_HAVE_DEBUG_STACKOVERFLOW=y
> > # CONFIG_DEBUG_STACKOVERFLOW is not set
> > CONFIG_HAVE_ARCH_KMEMCHECK=y
> > # CONFIG_KMEMCHECK is not set
> > # CONFIG_DEBUG_SHIRQ is not set
> > 
> > #
> > # Debug Lockups and Hangs
> > #
> > # CONFIG_LOCKUP_DETECTOR is not set
> > # CONFIG_DETECT_HUNG_TASK is not set
> > # CONFIG_PANIC_ON_OOPS is not set
> > CONFIG_PANIC_ON_OOPS_VALUE=0
> > CONFIG_PANIC_TIMEOUT=0
> > 
> > #
> > # Lock Debugging (spinlocks, mutexes, etc...)
> > #
> > # CONFIG_DEBUG_SPINLOCK is not set
> > # CONFIG_DEBUG_MUTEXES is not set
> > # CONFIG_DEBUG_WW_MUTEX_SLOWPATH is not set
> > # CONFIG_DEBUG_LOCK_ALLOC is not set
> > # CONFIG_PROVE_LOCKING is not set
> > # CONFIG_LOCK_STAT is not set
> > # CONFIG_DEBUG_ATOMIC_SLEEP is not set
> > # CONFIG_DEBUG_LOCKING_API_SELFTESTS is not set
> > # CONFIG_LOCK_TORTURE_TEST is not set
> > # CONFIG_DEBUG_KOBJECT is not set
> > # CONFIG_DEBUG_LIST is not set
> > # CONFIG_DEBUG_SG is not set
> > # CONFIG_DEBUG_NOTIFIERS is not set
> > # CONFIG_DEBUG_CREDENTIALS is not set
> > 
> > #
> > # RCU Debugging
> > #
> > # CONFIG_SPARSE_RCU_POINTER is not set
> > # CONFIG_TORTURE_TEST is not set
> > # CONFIG_RCU_TORTURE_TEST is not set
> > # CONFIG_RCU_TRACE is not set
> > # CONFIG_DEBUG_BLOCK_EXT_DEVT is not set
> > # CONFIG_NOTIFIER_ERROR_INJECTION is not set
> > # CONFIG_FAULT_INJECTION is not set
> > CONFIG_ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS=y
> > # CONFIG_DEBUG_STRICT_USER_COPY_CHECKS is not set
> > CONFIG_USER_STACKTRACE_SUPPORT=y
> > CONFIG_HAVE_FUNCTION_TRACER=y
> > CONFIG_HAVE_FUNCTION_GRAPH_TRACER=y
> > CONFIG_HAVE_FUNCTION_GRAPH_FP_TEST=y
> > CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST=y
> > CONFIG_HAVE_DYNAMIC_FTRACE=y
> > CONFIG_HAVE_DYNAMIC_FTRACE_WITH_REGS=y
> > CONFIG_HAVE_FTRACE_MCOUNT_RECORD=y
> > CONFIG_HAVE_SYSCALL_TRACEPOINTS=y
> > CONFIG_HAVE_FENTRY=y
> > CONFIG_HAVE_C_RECORDMCOUNT=y
> > CONFIG_TRACING_SUPPORT=y
> > # CONFIG_FTRACE is not set
> > 
> > #
> > # Runtime Testing
> > #
> > # CONFIG_TEST_LIST_SORT is not set
> > # CONFIG_BACKTRACE_SELF_TEST is not set
> > # CONFIG_RBTREE_TEST is not set
> > # CONFIG_INTERVAL_TREE_TEST is not set
> > # CONFIG_PERCPU_TEST is not set
> > # CONFIG_ATOMIC64_SELFTEST is not set
> > # CONFIG_TEST_STRING_HELPERS is not set
> > # CONFIG_TEST_KSTRTOX is not set
> > # CONFIG_DMA_API_DEBUG is not set
> > # CONFIG_TEST_MODULE is not set
> > # CONFIG_TEST_USER_COPY is not set
> > # CONFIG_SAMPLES is not set
> > CONFIG_HAVE_ARCH_KGDB=y
> > # CONFIG_KGDB is not set
> > # CONFIG_STRICT_DEVMEM is not set
> > # CONFIG_X86_VERBOSE_BOOTUP is not set
> > # CONFIG_EARLY_PRINTK is not set
> > # CONFIG_X86_PTDUMP is not set
> > # CONFIG_DEBUG_RODATA is not set
> > # CONFIG_DEBUG_SET_MODULE_RONX is not set
> > # CONFIG_DEBUG_NX_TEST is not set
> > # CONFIG_DOUBLEFAULT is not set
> > # CONFIG_DEBUG_TLBFLUSH is not set
> > # CONFIG_IOMMU_STRESS is not set
> > CONFIG_HAVE_MMIOTRACE_SUPPORT=y
> > CONFIG_IO_DELAY_TYPE_0X80=0
> > CONFIG_IO_DELAY_TYPE_0XED=1
> > CONFIG_IO_DELAY_TYPE_UDELAY=2
> > CONFIG_IO_DELAY_TYPE_NONE=3
> > CONFIG_IO_DELAY_0X80=y
> > # CONFIG_IO_DELAY_0XED is not set
> > # CONFIG_IO_DELAY_UDELAY is not set
> > # CONFIG_IO_DELAY_NONE is not set
> > CONFIG_DEFAULT_IO_DELAY_TYPE=0
> > # CONFIG_CPA_DEBUG is not set
> > # CONFIG_OPTIMIZE_INLINING is not set
> > # CONFIG_DEBUG_NMI_SELFTEST is not set
> > # CONFIG_X86_DEBUG_STATIC_CPU_HAS is not set
> > 
> > #
> > # Security options
> > #
> > # CONFIG_KEYS is not set
> > # CONFIG_SECURITY_DMESG_RESTRICT is not set
> > # CONFIG_SECURITYFS is not set
> > CONFIG_DEFAULT_SECURITY_DAC=y
> > CONFIG_DEFAULT_SECURITY=""
> > # CONFIG_CRYPTO is not set
> > CONFIG_HAVE_KVM=y
> > # CONFIG_VIRTUALIZATION is not set
> > # CONFIG_BINARY_PRINTF is not set
> > 
> > #
> > # Library routines
> > #
> > CONFIG_BITREVERSE=y
> > CONFIG_GENERIC_STRNCPY_FROM_USER=y
> > CONFIG_GENERIC_STRNLEN_USER=y
> > CONFIG_GENERIC_FIND_FIRST_BIT=y
> > CONFIG_GENERIC_PCI_IOMAP=y
> > CONFIG_GENERIC_IOMAP=y
> > CONFIG_GENERIC_IO=y
> > CONFIG_ARCH_USE_CMPXCHG_LOCKREF=y
> > # CONFIG_CRC_CCITT is not set
> > # CONFIG_CRC16 is not set
> > # CONFIG_CRC_T10DIF is not set
> > # CONFIG_CRC_ITU_T is not set
> > CONFIG_CRC32=y
> > # CONFIG_CRC32_SELFTEST is not set
> > CONFIG_CRC32_SLICEBY8=y
> > # CONFIG_CRC32_SLICEBY4 is not set
> > # CONFIG_CRC32_SARWATE is not set
> > # CONFIG_CRC32_BIT is not set
> > # CONFIG_CRC7 is not set
> > # CONFIG_LIBCRC32C is not set
> > # CONFIG_CRC8 is not set
> > # CONFIG_AUDIT_ARCH_COMPAT_GENERIC is not set
> > # CONFIG_RANDOM32_SELFTEST is not set
> > # CONFIG_XZ_DEC is not set
> > # CONFIG_XZ_DEC_BCJ is not set
> > CONFIG_HAS_IOMEM=y
> > CONFIG_HAS_IOPORT_MAP=y
> > CONFIG_HAS_DMA=y
> > CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE=y
> > # CONFIG_AVERAGE is not set
> > # CONFIG_CORDIC is not set
> > # CONFIG_DDR is not set
> 
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