linux-kernel - [PATCH 00/17] Enable strict compile-time memcpy() fortify checks

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Date:   Mon, 13 Dec 2021 14:33:14 -0800
From:   Kees Cook <keescook@...omium.org>
To:     linux-hardening@...r.kernel.org
Cc:     Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org
Subject: [PATCH 00/17] Enable strict compile-time memcpy() fortify checks

Hi,

This is "phase 2" (of several phases) to hardening the kernel against
memcpy-based buffer overflows. With nearly all compile-time fixes
landed, the next step is to turn on the warning globally to keep future
compile-time issues from happening, and let us take the step towards
run-time checking (and towards a new API for flexible array structures).

This series is based on latest linux-next, and several patches here
have already been taken by subsystem maintainers but haven't appeared
in linux-next yet, and are noted below.

-Kees

refactoring patches expected to be going via subsystem trees:
    sata_fsl: Use struct_group() for memcpy() region
	https://lore.kernel.org/lkml/23527f89-d098-ab6b-f3c9-a8a395e32df5@opensource.wdc.com/
    ath11k: Use memset_startat() for clearing queue descriptors
	https://lore.kernel.org/lkml/163777372886.11557.5551795598856429949.kvalo@codeaurora.org/

refactoring patches going via my topic tree due to having no current response:
    net/mlx5e: Use struct_group() for memcpy() region
	https://lore.kernel.org/lkml/20211118183748.1283069-1-keescook@chromium.org/
    net/mlx5e: Avoid field-overflowing memcpy()
	https://lore.kernel.org/lkml/20211209053402.2202206-1-keescook@chromium.org/
    media: omap3isp: Use struct_group() for memcpy() region
	https://lore.kernel.org/lkml/20211118184352.1284792-1-keescook@chromium.org/
    drbd: Use struct_group() to zero algs
	https://lore.kernel.org/lkml/20211118203712.1288866-1-keescook@chromium.org/
    dm integrity: Use struct_group() to zero struct journal_sector
	https://lore.kernel.org/lkml/20211118203640.1288585-1-keescook@chromium.org/
    iw_cxgb4: Use memset_startat() for cpl_t5_pass_accept_rpl
	https://lore.kernel.org/lkml/20211118202335.1285836-1-keescook@chromium.org/

refactoring patches going via my topic tree due to Acks:
    KVM: x86: Replace memset() "optimization" with normal per-field writes
	https://lore.kernel.org/lkml/202108181605.44C504C@keescook/
    RDMA/mlx5: Use memset_after() to zero struct mlx5_ib_mr
	https://lore.kernel.org/lkml/YbByJSkBgLRp5S8V@unreal/
    intel_th: msu: Use memset_startat() for clearing hw header
	https://lore.kernel.org/lkml/87sfyzi97l.fsf@ashishki-desk.ger.corp.intel.com/
    IB/mthca: Use memset_startat() for clearing mpt_entry
	https://lore.kernel.org/lkml/20211118202126.1285376-1-keescook@chromium.org/
    scsi: lpfc: Use struct_group() to initialize struct lpfc_cgn_info
	https://lore.kernel.org/lkml/1164349c-93a5-ebb8-94aa-dbe03957c40f@gmail.com/

fortify changes going via my topic tree:
    fortify: Detect struct member overflows in memcpy() at compile-time
    fortify: Detect struct member overflows in memmove() at compile-time
    fortify: Detect struct member overflows in memset() at compile-time
    fortify: Work around Clang inlining bugs


 arch/x86/boot/compressed/misc.c               |   3 +-
 arch/x86/kvm/emulate.c                        |   9 +-
 arch/x86/kvm/kvm_emulate.h                    |   6 +-
 arch/x86/lib/memcpy_32.c                      |   1 +
 drivers/ata/sata_fsl.c                        |  10 +-
 drivers/block/drbd/drbd_main.c                |   3 +-
 drivers/block/drbd/drbd_protocol.h            |   6 +-
 drivers/block/drbd/drbd_receiver.c            |   3 +-
 drivers/hwtracing/intel_th/msu.c              |   4 +-
 drivers/infiniband/hw/cxgb4/cm.c              |   5 +-
 drivers/infiniband/hw/mlx5/mlx5_ib.h          |   4 +-
 drivers/infiniband/hw/mthca/mthca_mr.c        |   3 +-
 drivers/md/dm-integrity.c                     |   9 +-
 drivers/media/platform/omap3isp/ispstat.c     |   5 +-
 drivers/net/ethernet/chelsio/cxgb4/t4_msg.h   |   2 +-
 drivers/net/ethernet/mellanox/mlx5/core/en.h  |   6 +-
 .../net/ethernet/mellanox/mlx5/core/en/xdp.c  |   4 +-
 .../net/ethernet/mellanox/mlx5/core/en_tx.c   |   2 +-
 drivers/net/wireless/ath/ath11k/hal_rx.c      |  13 +-
 drivers/scsi/lpfc/lpfc.h                      |  90 ++++---
 drivers/scsi/lpfc/lpfc_init.c                 |   4 +-
 include/linux/fortify-string.h                | 245 +++++++++++++-----
 include/linux/if_vlan.h                       |   6 +-
 include/uapi/linux/omap3isp.h                 |  21 +-
 lib/Makefile                                  |   3 +-
 lib/string_helpers.c                          |   6 +
 .../read_overflow2_field-memcpy.c             |   5 +
 .../read_overflow2_field-memmove.c            |   5 +
 .../write_overflow_field-memcpy.c             |   5 +
 .../write_overflow_field-memmove.c            |   5 +
 .../write_overflow_field-memset.c             |   5 +
 scripts/test_fortify.sh                       |   8 +-
 security/Kconfig                              |   2 +-
 33 files changed, 344 insertions(+), 164 deletions(-)
 create mode 100644 lib/test_fortify/read_overflow2_field-memcpy.c
 create mode 100644 lib/test_fortify/read_overflow2_field-memmove.c
 create mode 100644 lib/test_fortify/write_overflow_field-memcpy.c
 create mode 100644 lib/test_fortify/write_overflow_field-memmove.c
 create mode 100644 lib/test_fortify/write_overflow_field-memset.c

-- 
2.30.2