This series backports the patchset
"exit: Put an upper limit on how often we can oops"
(https://lore.kernel.org/linux-mm/20221117233838.give.484-kees@kernel.org/T/#u)
to 5.15, as recommended at
https://googleprojectzero.blogspot.com/2023/01/exploiting-null-dereferences-in-linux.html

This required backporting various prerequisite patches.

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

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 (8):
  panic: Separate sysctl logic from CONFIG_SMP
  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 (3):
  hexagon: Fix function name in die()
  h8300: Fix build errors from do_exit() to make_task_dead() transition
  csky: Fix function name in csky_alignment() and die()

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

Tiezhu Yang (3):
  panic: unset panic_on_warn inside panic()
  ubsan: no need to unset panic_on_warn in ubsan_epilogue()
  kasan: no need to unset panic_on_warn in end_report()

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

tangmeng (1):
  kernel/panic: move panic sysctls to its own file

 .../ABI/testing/sysfs-kernel-oops_count       |  6 ++
 .../ABI/testing/sysfs-kernel-warn_count       |  6 ++
 Documentation/admin-guide/sysctl/kernel.rst   | 19 ++++
 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/csky/abiv1/alignment.c                   |  2 +-
 arch/csky/kernel/traps.c                      |  2 +-
 arch/csky/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/nds32/kernel/fpu.c                       |  2 +-
 arch/nds32/kernel/traps.c                     |  8 +-
 arch/nios2/kernel/traps.c                     |  4 +-
 arch/openrisc/kernel/traps.c                  |  2 +-
 arch/parisc/kernel/traps.c                    |  2 +-
 arch/powerpc/kernel/traps.c                   |  8 +-
 arch/riscv/kernel/traps.c                     |  2 +-
 arch/riscv/mm/fault.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/panic.h                         |  7 +-
 include/linux/sched/task.h                    |  1 +
 include/linux/sysctl.h                        |  3 +
 kernel/exit.c                                 | 72 +++++++++++++++
 kernel/kcsan/report.c                         |  3 +-
 kernel/panic.c                                | 90 ++++++++++++++++---
 kernel/sched/core.c                           |  3 +-
 kernel/sysctl.c                               | 11 ---
 lib/ubsan.c                                   | 11 +--
 mm/kasan/report.c                             | 12 +--
 mm/kfence/report.c                            |  3 +-
 tools/objtool/check.c                         |  3 +-
 53 files changed, 281 insertions(+), 111 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-kernel-oops_count
 create mode 100644 Documentation/ABI/testing/sysfs-kernel-warn_count


base-commit: aabd5ba7e9b03e9a211a4842ab4a93d46f684d2c
-- 
2.39.1

On Tue, Jan 24, 2023 at 10:50:50AM -0800, Eric Biggers wrote:
>This series backports the patchset
>"exit: Put an upper limit on how often we can oops"
>(https://lore.kernel.org/linux-mm/20221117233838.give.484-kees@kernel.org/T/#u)
>to 5.15, as recommended at
>https://googleprojectzero.blogspot.com/2023/01/exploiting-null-dereferences-in-linux.html

I've queued up this and the 5.10 backport, thanks!

-- 
Thanks,
Sasha