lkml.org 
[lkml]   [2017]   [Apr]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Subject[PATCH 00/24] Kernel lockdown
    From
    Date

    These patches provide a facility by which a variety of avenues by which
    userspace can feasibly modify the running kernel image can be locked down.
    These include:

    (*) No unsigned modules and no modules for which can't validate the
    signature.

    (*) No use of ioperm(), iopl() and no writing to /dev/port.

    (*) No writing to /dev/mem or /dev/kmem.

    (*) No hibernation.

    (*) Restrict PCI BAR access.

    (*) Restrict MSR access.

    (*) No kexec_load().

    (*) Certain ACPI restrictions.

    (*) Restrict debugfs interface to ASUS WMI.

    The lock-down can be configured to be triggered by the EFI secure boot
    status, provided the shim isn't insecure. The lock-down can be lifted by
    typing SysRq+x on a keyboard attached to the system.


    The patches can be found here also:

    http://git.kernel.org/cgit/linux/kernel/git/dhowells/linux-fs.git/log/?h=efi-lockdown

    They are dependent on the hwparam branch, which I posted separately.

    David
    ---
    Chun-Yi Lee (2):
    kexec_file: Disable at runtime if securelevel has been set
    bpf: Restrict kernel image access functions when the kernel is locked down

    Dave Young (1):
    Copy secure_boot flag in boot params across kexec reboot

    David Howells (7):
    Add the ability to lock down access to the running kernel image
    efi: Lock down the kernel if booted in secure boot mode
    Enforce module signatures if the kernel is locked down
    scsi: Lock down the eata driver
    Prohibit PCMCIA CIS storage when the kernel is locked down
    Lock down TIOCSSERIAL
    Lock down module params that specify hardware parameters (eg. ioport)

    Josh Boyer (3):
    efi: Add EFI_SECURE_BOOT bit
    hibernate: Disable when the kernel is locked down
    acpi: Ignore acpi_rsdp kernel param when the kernel has been locked down

    Kyle McMartin (1):
    Add a sysrq option to exit secure boot mode

    Linn Crosetto (2):
    acpi: Disable ACPI table override if the kernel is locked down
    acpi: Disable APEI error injection if the kernel is locked down

    Matthew Garrett (8):
    Restrict /dev/mem and /dev/kmem when the kernel is locked down
    kexec: Disable at runtime if the kernel is locked down
    uswsusp: Disable when the kernel is locked down
    PCI: Lock down BAR access when the kernel is locked down
    x86: Lock down IO port access when the kernel is locked down
    x86: Restrict MSR access when the kernel is locked down
    asus-wmi: Restrict debugfs interface when the kernel is locked down
    ACPI: Limit access to custom_method when the kernel is locked down


    arch/x86/Kconfig | 22 ++++++++++++++++++++
    arch/x86/kernel/ioport.c | 4 ++--
    arch/x86/kernel/kexec-bzimage64.c | 1 +
    arch/x86/kernel/msr.c | 7 ++++++
    arch/x86/kernel/setup.c | 40 ++++++++++++++++++++++++++++++++++++-
    drivers/acpi/apei/einj.c | 3 +++
    drivers/acpi/custom_method.c | 3 +++
    drivers/acpi/osl.c | 2 +-
    drivers/acpi/tables.c | 5 +++++
    drivers/char/mem.c | 8 +++++++
    drivers/input/misc/uinput.c | 1 +
    drivers/pci/pci-sysfs.c | 9 ++++++++
    drivers/pci/proc.c | 8 ++++++-
    drivers/pci/syscall.c | 2 +-
    drivers/pcmcia/cistpl.c | 5 +++++
    drivers/platform/x86/asus-wmi.c | 9 ++++++++
    drivers/scsi/eata.c | 7 ++++++
    drivers/tty/serial/serial_core.c | 6 ++++++
    drivers/tty/sysrq.c | 19 ++++++++++++------
    include/linux/efi.h | 1 +
    include/linux/input.h | 5 +++++
    include/linux/kernel.h | 9 ++++++++
    include/linux/security.h | 11 ++++++++++
    include/linux/sysrq.h | 8 ++++++-
    kernel/debug/kdb/kdb_main.c | 2 +-
    kernel/kexec.c | 7 ++++++
    kernel/kexec_file.c | 6 ++++++
    kernel/module.c | 2 +-
    kernel/params.c | 27 ++++++++++++++++++++-----
    kernel/power/hibernate.c | 2 +-
    kernel/power/user.c | 3 +++
    kernel/trace/bpf_trace.c | 11 ++++++++++
    security/Kconfig | 15 ++++++++++++++
    security/Makefile | 3 +++
    security/lock_down.c | 40 +++++++++++++++++++++++++++++++++++++
    35 files changed, 291 insertions(+), 22 deletions(-)
    create mode 100644 security/lock_down.c

    \
     
     \ /
      Last update: 2017-04-05 22:15    [W:2.037 / U:0.024 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site