[4.14,00/16] Backport oops_limit to 4.14

Message

Eric Biggers Feb. 2, 2023, 5:43 a.m. UTC

From: Eric Biggers <[e-mail]>

This series backports the patchset
"exit: Put an upper limit on how often we can oops"
(https://lore.kernel.org/linux-mm/[e-mail]/T/#u)
to 4.14, as recommended at
https://googleprojectzero.blogspot.com/2023/01/exploiting-null-dereferences-in-linux.html
This follows the backports to 5.10 and 5.15 which already released, and
the backports to 5.4 and 4.19 that I just sent out too.

This required backporting various prerequisite patches.

I've tested that oops_limit and warn_limit work correctly on x86_64.

David Gow (1):
  mm: kasan: do not panic if both panic_on_warn and kasan_multishot set

Eric W. Biederman (2):
  exit: Add and use make_task_dead.
  objtool: Add a missing comma to avoid string concatenation

Jann Horn (1):
  exit: Put an upper limit on how often we can oops

Kees Cook (7):
  exit: Expose "oops_count" to sysfs
  exit: Allow oops_limit to be disabled
  panic: Consolidate open-coded panic_on_warn checks
  panic: Introduce warn_limit
  panic: Expose "warn_count" to sysfs
  docs: Fix path paste-o for /sys/kernel/warn_count
  exit: Use READ_ONCE() for all oops/warn limit reads

Nathan Chancellor (2):
  hexagon: Fix function name in die()
  h8300: Fix build errors from do_exit() to make_task_dead() transition

Randy Dunlap (1):
  ia64: make IA64_MCA_RECOVERY bool instead of tristate

Tiezhu Yang (1):
  panic: unset panic_on_warn inside panic()

Xiaoming Ni (1):
  sysctl: add a new register_sysctl_init() interface

 .../ABI/testing/sysfs-kernel-oops_count       |  6 ++
 .../ABI/testing/sysfs-kernel-warn_count       |  6 ++
 Documentation/sysctl/kernel.txt               | 20 +++++
 arch/alpha/kernel/traps.c                     |  6 +-
 arch/alpha/mm/fault.c                         |  2 +-
 arch/arm/kernel/traps.c                       |  2 +-
 arch/arm/mm/fault.c                           |  2 +-
 arch/arm64/kernel/traps.c                     |  2 +-
 arch/arm64/mm/fault.c                         |  2 +-
 arch/h8300/kernel/traps.c                     |  3 +-
 arch/h8300/mm/fault.c                         |  2 +-
 arch/hexagon/kernel/traps.c                   |  2 +-
 arch/ia64/Kconfig                             |  2 +-
 arch/ia64/kernel/mca_drv.c                    |  2 +-
 arch/ia64/kernel/traps.c                      |  2 +-
 arch/ia64/mm/fault.c                          |  2 +-
 arch/m68k/kernel/traps.c                      |  2 +-
 arch/m68k/mm/fault.c                          |  2 +-
 arch/microblaze/kernel/exceptions.c           |  4 +-
 arch/mips/kernel/traps.c                      |  2 +-
 arch/nios2/kernel/traps.c                     |  4 +-
 arch/openrisc/kernel/traps.c                  |  2 +-
 arch/parisc/kernel/traps.c                    |  2 +-
 arch/powerpc/kernel/traps.c                   |  2 +-
 arch/s390/kernel/dumpstack.c                  |  2 +-
 arch/s390/kernel/nmi.c                        |  2 +-
 arch/sh/kernel/traps.c                        |  2 +-
 arch/sparc/kernel/traps_32.c                  |  4 +-
 arch/sparc/kernel/traps_64.c                  |  4 +-
 arch/x86/entry/entry_32.S                     |  6 +-
 arch/x86/entry/entry_64.S                     |  6 +-
 arch/x86/kernel/dumpstack.c                   |  4 +-
 arch/xtensa/kernel/traps.c                    |  2 +-
 fs/proc/proc_sysctl.c                         | 33 ++++++++
 include/linux/kernel.h                        |  1 +
 include/linux/sched/task.h                    |  1 +
 include/linux/sysctl.h                        |  3 +
 kernel/exit.c                                 | 72 ++++++++++++++++++
 kernel/panic.c                                | 75 ++++++++++++++++---
 kernel/sched/core.c                           |  3 +-
 mm/kasan/report.c                             |  4 +-
 tools/objtool/check.c                         |  3 +-
 42 files changed, 252 insertions(+), 58 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-kernel-oops_count
 create mode 100644 Documentation/ABI/testing/sysfs-kernel-warn_count


base-commit: 3949d16100044eeb6723eca03b1038b469fb9ae8