linux/arch/arm
Linus Torvalds 1ec6574a3c This set of changes updates init and user mode helper tasks to be
ordinary user mode tasks.
 
 In commit 40966e316f ("kthread: Ensure struct kthread is present for
 all kthreads") caused init and the user mode helper threads that call
 kernel_execve to have struct kthread allocated for them.  This struct
 kthread going away during execve in turned made a use after free of
 struct kthread possible.
 
 The commit 343f4c49f2 ("kthread: Don't allocate kthread_struct for
 init and umh") is enough to fix the use after free and is simple enough
 to be backportable.
 
 The rest of the changes pass struct kernel_clone_args to clean things
 up and cause the code to make sense.
 
 In making init and the user mode helpers tasks purely user mode tasks
 I ran into two complications.  The function task_tick_numa was
 detecting tasks without an mm by testing for the presence of
 PF_KTHREAD.  The initramfs code in populate_initrd_image was using
 flush_delayed_fput to ensuere the closing of all it's file descriptors
 was complete, and flush_delayed_fput does not work in a userspace thread.
 
 I have looked and looked and more complications and in my code review
 I have not found any, and neither has anyone else with the code sitting
 in linux-next.
 
 Link: https://lkml.kernel.org/r/87mtfu4up3.fsf@email.froward.int.ebiederm.org
 
 Eric W. Biederman (8):
       kthread: Don't allocate kthread_struct for init and umh
       fork: Pass struct kernel_clone_args into copy_thread
       fork: Explicity test for idle tasks in copy_thread
       fork: Generalize PF_IO_WORKER handling
       init: Deal with the init process being a user mode process
       fork: Explicitly set PF_KTHREAD
       fork: Stop allowing kthreads to call execve
       sched: Update task_tick_numa to ignore tasks without an mm
 
  arch/alpha/kernel/process.c      | 13 ++++++------
  arch/arc/kernel/process.c        | 13 ++++++------
  arch/arm/kernel/process.c        | 12 ++++++-----
  arch/arm64/kernel/process.c      | 12 ++++++-----
  arch/csky/kernel/process.c       | 15 ++++++-------
  arch/h8300/kernel/process.c      | 10 ++++-----
  arch/hexagon/kernel/process.c    | 12 ++++++-----
  arch/ia64/kernel/process.c       | 15 +++++++------
  arch/m68k/kernel/process.c       | 12 ++++++-----
  arch/microblaze/kernel/process.c | 12 ++++++-----
  arch/mips/kernel/process.c       | 13 ++++++------
  arch/nios2/kernel/process.c      | 12 ++++++-----
  arch/openrisc/kernel/process.c   | 12 ++++++-----
  arch/parisc/kernel/process.c     | 18 +++++++++-------
  arch/powerpc/kernel/process.c    | 15 +++++++------
  arch/riscv/kernel/process.c      | 12 ++++++-----
  arch/s390/kernel/process.c       | 12 ++++++-----
  arch/sh/kernel/process_32.c      | 12 ++++++-----
  arch/sparc/kernel/process_32.c   | 12 ++++++-----
  arch/sparc/kernel/process_64.c   | 12 ++++++-----
  arch/um/kernel/process.c         | 15 +++++++------
  arch/x86/include/asm/fpu/sched.h |  2 +-
  arch/x86/include/asm/switch_to.h |  8 +++----
  arch/x86/kernel/fpu/core.c       |  4 ++--
  arch/x86/kernel/process.c        | 18 +++++++++-------
  arch/xtensa/kernel/process.c     | 17 ++++++++-------
  fs/exec.c                        |  8 ++++---
  include/linux/sched/task.h       |  8 +++++--
  init/initramfs.c                 |  2 ++
  init/main.c                      |  2 +-
  kernel/fork.c                    | 46 +++++++++++++++++++++++++++++++++-------
  kernel/sched/fair.c              |  2 +-
  kernel/umh.c                     |  6 +++---
  33 files changed, 234 insertions(+), 160 deletions(-)
 
 Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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Merge tag 'kthread-cleanups-for-v5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

Pull kthread updates from Eric Biederman:
 "This updates init and user mode helper tasks to be ordinary user mode
  tasks.

  Commit 40966e316f ("kthread: Ensure struct kthread is present for
  all kthreads") caused init and the user mode helper threads that call
  kernel_execve to have struct kthread allocated for them. This struct
  kthread going away during execve in turned made a use after free of
  struct kthread possible.

  Here, commit 343f4c49f2 ("kthread: Don't allocate kthread_struct for
  init and umh") is enough to fix the use after free and is simple
  enough to be backportable.

  The rest of the changes pass struct kernel_clone_args to clean things
  up and cause the code to make sense.

  In making init and the user mode helpers tasks purely user mode tasks
  I ran into two complications. The function task_tick_numa was
  detecting tasks without an mm by testing for the presence of
  PF_KTHREAD. The initramfs code in populate_initrd_image was using
  flush_delayed_fput to ensuere the closing of all it's file descriptors
  was complete, and flush_delayed_fput does not work in a userspace
  thread.

  I have looked and looked and more complications and in my code review
  I have not found any, and neither has anyone else with the code
  sitting in linux-next"

* tag 'kthread-cleanups-for-v5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
  sched: Update task_tick_numa to ignore tasks without an mm
  fork: Stop allowing kthreads to call execve
  fork: Explicitly set PF_KTHREAD
  init: Deal with the init process being a user mode process
  fork: Generalize PF_IO_WORKER handling
  fork: Explicity test for idle tasks in copy_thread
  fork: Pass struct kernel_clone_args into copy_thread
  kthread: Don't allocate kthread_struct for init and umh
2022-06-03 16:03:05 -07:00
..
boot USB / Thunderbolt changes for 5.19-rc1 2022-06-03 11:17:49 -07:00
common
configs ARM: omap1: enable multiplatform 2022-06-03 20:48:53 +02:00
crypto
include ARM: multiplatform changes, part 2 2022-06-02 15:23:54 -07:00
kernel This set of changes updates init and user mode helper tasks to be 2022-06-03 16:03:05 -07:00
lib
mach-actions
mach-airoha
mach-alpine
mach-artpec
mach-asm9260
mach-aspeed
mach-at91 AT91 SoC #2 for 5.19: 2022-05-27 15:56:30 +02:00
mach-axxia
mach-bcm
mach-berlin
mach-clps711x
mach-cns3xxx
mach-davinci gpio updates for v5.19 2022-05-26 14:51:38 -07:00
mach-digicolor
mach-dove
mach-ep93xx ARM: ep93xx: Make ts72xx_register_flash() static 2022-05-27 16:00:58 +02:00
mach-exynos ARM: ARMv4T/v5 multiplatform support for v5.19, part 1 2022-05-26 10:43:09 -07:00
mach-footbridge
mach-gemini
mach-highbank
mach-hisi ARM: ARMv4T/v5 multiplatform support for v5.19, part 1 2022-05-26 10:43:09 -07:00
mach-hpe ARM: hpe: Introduce the HPE GXP architecture 2022-05-18 14:05:53 +02:00
mach-imx
mach-iop32x ARM: ARMv4T/v5 multiplatform support for v5.19, part 1 2022-05-26 10:43:09 -07:00
mach-ixp4xx ARM: ixp4xx: Consolidate Kconfig fixing issue 2022-05-25 15:54:11 +02:00
mach-keystone
mach-lpc18xx
mach-lpc32xx
mach-mediatek
mach-meson
mach-milbeaut
mach-mmp ARM: multiplatform changes, part 2 2022-06-02 15:23:54 -07:00
mach-moxart
mach-mstar
mach-mv78xx0
mach-mvebu
mach-mxs
mach-nomadik ARM: ARMv4T/v5 multiplatform support for v5.19, part 1 2022-05-26 10:43:09 -07:00
mach-npcm
mach-nspire
mach-omap1 ARM: omap1: enable multiplatform 2022-06-03 20:48:53 +02:00
mach-omap2 ARM: ARMv4T/v5 multiplatform support for v5.19, part 1 2022-05-26 10:43:09 -07:00
mach-orion5x ARM: ARMv4T/v5 multiplatform support for v5.19, part 1 2022-05-26 10:43:09 -07:00
mach-oxnas
mach-pxa ARM: multiplatform changes, part 2 2022-06-02 15:23:54 -07:00
mach-qcom
mach-rda
mach-realtek
mach-rockchip
mach-rpc
mach-s3c ARM: ARMv4T/v5 multiplatform support for v5.19, part 1 2022-05-26 10:43:09 -07:00
mach-s5pv210
mach-sa1100
mach-shmobile
mach-socfpga
mach-spear
mach-sti
mach-stm32
mach-sunxi ARM: ARMv4T/v5 multiplatform support for v5.19, part 1 2022-05-26 10:43:09 -07:00
mach-tegra
mach-uniphier
mach-ux500
mach-versatile ARM: ARMv4T/v5 multiplatform support for v5.19, part 1 2022-05-26 10:43:09 -07:00
mach-vt8500
mach-zynq
mm ARM: multiplatform changes, part 2 2022-06-02 15:23:54 -07:00
net
nwfpe
plat-orion
probes
tools
vdso randstruct: Split randstruct Makefile and CFLAGS 2022-05-08 01:33:06 -07:00
vfp
xen dma-mapping updates for Linux 5.19 2022-05-25 19:18:36 -07:00
Kbuild
Kconfig ARM: omap1: enable multiplatform 2022-06-03 20:48:53 +02:00
Kconfig-nommu
Kconfig.assembler
Kconfig.debug ARM: ARMv4T/v5 multiplatform support for v5.19, part 1 2022-05-26 10:43:09 -07:00
Makefile ARM: SoC changes, part 2 2022-06-02 15:27:44 -07:00