[GIT PULL] hardening updates for v7.4-rc1

[GIT PULL] hardening updates for v7.4-rc1

[Kees Cook]

Hi Linus,

Please pull these hardening updates for v7.4-rc1. There are 2 topics
that stand out: the kmalloc_obj*-style API for devm_kmalloc() (for which
I'll be sending a separate tree-wide patch near the end of -rc1), and the
seq_buf API clean-ups and improvements (which is expected to have a small
follow-up fix coming). The things scattered around the tree outside of
normal areas are mainly clean-ups and fixes related to both those topics.

Thanks!

-Kees

The following changes since commit df2908090cda368b01ff43709f51890076c56157:

  Linux 7.3-rc2 (2026-09-06 15:07:20 -0700)

are available in the Git repository at:

  https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git tags/hardening-v7.4-rc1

for you to fetch changes up to 2f70a9b7e9c74b92a85a2584090f0f5c4cbaa4be:

  overflow: Match arithmetic in both parts of __builtin_choose_expr (2026-10-14 18:05:52 -0700)

----------------------------------------------------------------
hardening updates for v7.4-rc1

- Provide kmalloc_obj*-style API for devm_kmalloc()

- Improve seq_buf API for saner C String handling with several bug
  fixes along the way (Kees Cook, Bill Wendling)

- Overflow helper readability improvements (Bill Wendling)

- Unexport native_write_cr4() (Dennis Chen)

- um: fix CONFIG_GCOV for built-in code (Johannes Berg)

- Improve stackinit test coverage (Justin Stitt)

- KMSAN: fix memset() when using fortify-source, again (Arnd Bergmann)

- lkdtm: use kmalloc() instead of __get_free_page (Mahad Ibrahim)

- signalfd: don't dequeue the forced fatal signals (Oleg Nesterov)

- Fix randstruct to recognize new container_of() behavior

- coccinelle: kmalloc_obj: Convert multi-byte integral allocations too

- Fix a couple remaining allocation return type mismatches

----------------------------------------------------------------
Arnd Bergmann (1):
      KMSAN: fix memset() when using fortify-source, again

Bill Wendling (2):
      seq_buf: Add seq_buf_init_append()
      overflow: Match arithmetic in both parts of __builtin_choose_expr

Dennis Chen (1):
      lkdtm: Make UNSET_SMEP built-in-only and unexport native_write_cr4()

Johannes Berg (1):
      um: fix CONFIG_GCOV for built-in code

Justin Stitt (2):
      MAINTAINERS: Add stackinit KUnit test to HARDENING
      kunit/stackinit: Cover declarations bypassed by goto and switch

Kees Cook (20):
      randstruct: fix container_of() false positives after __mptr removal
      randstruct: report bad casts as warnings rather than notes
      coccinelle: kmalloc_obj: Convert multi-byte integral allocations
      kunit/stackinit: Clean up XFAIL under instrumentation
      mm: Move default_gfp() into gfp_types.h
      devres: Provide kmalloc_obj*-style API for devm_kmalloc
      .get_maintainer.ignore: Add Kees Cook
      seq_buf: Do not print an empty line from an overflowed seq_buf_do_printk()
      seq_buf: Do not pop from an overflowed seq_buf
      scsi: lpfc: Print rx monitor records straight into the seq_buf
      seq_buf: Copy what fits when seq_buf_puts() and seq_buf_putmem() overflow
      seq_buf: Clear what a writer did not claim when a seq_buf overflows
      seq_buf: Add seq_buf_strlen()
      seq_buf: Add seq_buf_terminate()
      bpf: Remove dead newline stripping from format_disasm_line()
      powerpc/papr_scm: Return the string length from the sysfs show functions
      nvdimm: ndtest: Return the string length from flags_show()
      docs: core-api: Document the seq_buf API
      coresight: cti: Add const to con_groups allocation type
      extcon: realtek: Remove const from type_c_cfg allocation type

Mahad Ibrahim (1):
      lkdtm: use kmalloc() instead of __get_free_page

Oleg Nesterov (1):
      signalfd: don't dequeue the forced fatal signals

 scripts/coccinelle/api/kmalloc_objs.cocci         | 161 +++++--
 scripts/gcc-plugins/randomize_layout_plugin.c     |  63 ++-
 Documentation/core-api/kernel-api.rst             |   9 +
 include/linux/device/devres.h                     | 102 ++++
 include/linux/fortify-string.h                    |   2 -
 include/linux/gfp.h                               |   4 -
 include/linux/gfp_types.h                         |   4 +
 include/linux/overflow.h                          |   2 +-
 include/linux/seq_buf.h                           | 141 +++++-
 include/linux/trace_seq.h                         |   5 +-
 arch/um/include/asm/common.lds.S                  |   1 +
 drivers/misc/lkdtm/core.c                         |  16 +-
 arch/powerpc/platforms/pseries/papr_scm.c         |   6 +-
 arch/x86/kernel/cpu/common.c                      |   3 -
 drivers/extcon/extcon-rtk-type-c.c                |   3 +-
 drivers/hwtracing/coresight/coresight-cti-sysfs.c |   2 +-
 drivers/misc/lkdtm/bugs.c                         |   4 +-
 drivers/scsi/lpfc/lpfc_sli.c                      |  45 +-
 fs/signalfd.c                                     |  28 +-
 kernel/bpf/diagnostics.c                          |   8 +-
 kernel/trace/trace_events.c                       |   4 +-
 kernel/trace/trace_events_hist.c                  |   6 +-
 lib/seq_buf.c                                     |  37 +-
 lib/tests/seq_buf_kunit.c                         | 537 +++++++++++++++++++++-
 lib/tests/stackinit_kunit.c                       |  93 ++--
 tools/testing/nvdimm/test/ndtest.c                |   2 +-
 .get_maintainer.ignore                            |   1 +
 MAINTAINERS                                       |   1 +
 28 files changed, 1145 insertions(+), 145 deletions(-)

-- 
Kees Cook