Re: [PATCH v3 00/19] Introduce partial kernel_read_file() support

[Scott Branden]

On 2020-07-24 2:36 p.m., Kees Cook wrote:
> v3:
> - add reviews/acks
> - add "IMA: Add support for file reads without contents" patch
> - trim CC list, in case that's why vger ignored v2
> v2: [missing from lkml archives! (CC list too long?) repeating changes here]
> - fix issues in firmware test suite
> - add firmware partial read patches
> - various bug fixes/cleanups
> v1: https://lore.kernel.org/lkml/20200717174309.1164575-1-keescook@xxxxxxxxxxxx/
>
> Hi,
>
> Here's my tree for adding partial read support in kernel_read_file(),
> which fixes a number of issues along the way. It's got Scott's firmware
> and IMA patches ported and everything tests cleanly for me (even with
> CONFIG_IMA_APPRAISE=y).
>
> I think the intention is for this to go via Greg's tree since Scott's
> driver code will depend on it?
v3 of this patch series looks good and passes all of my tests.
Remaining patches
Acked-by: Scott Branden <scott.branden@xxxxxxxxxxxx>

I have added latest bcm-vk driver code to Kees' patch series and added 
it here:
https://github.com/sbranden/linux/tree/kernel_read_file_for_kees_v3

If everyone finds Kees' patch series acceptable then the 3 patches 
adding the bcm-vk driver
need to be added to the series. I can send the 3 patches out separately 
and then
the two patch series can be combined in Greg or someone's tree if that 
works?
Or if an in-kernel user beyond kernel selftest is needed for 
request_partial_firmware_into_buf
in Kees' patch series then another PATCH v4 needs to be sent out 
including the bcm-vk driver.
> Thanks,
>
> -Kees
>
>
> Kees Cook (15):

Thanks for help Kees, it's works now.
>    test_firmware: Test platform fw loading on non-EFI systems
>    selftest/firmware: Add selftest timeout in settings
>    firmware_loader: EFI firmware loader must handle pre-allocated buffer
>    fs/kernel_read_file: Remove FIRMWARE_PREALLOC_BUFFER enum
>    fs/kernel_read_file: Remove FIRMWARE_EFI_EMBEDDED enum
>    fs/kernel_read_file: Split into separate source file
>    fs/kernel_read_file: Remove redundant size argument
>    fs/kernel_read_file: Switch buffer size arg to size_t
>    fs/kernel_read_file: Add file_size output argument
>    LSM: Introduce kernel_post_load_data() hook
>    firmware_loader: Use security_post_load_data()
>    module: Call security_kernel_post_load_data()
>    LSM: Add "contents" flag to kernel_read_file hook
>    fs/kernel_file_read: Add "offset" arg for partial reads
>    firmware: Store opt_flags in fw_priv
>
> Scott Branden (4):
>    fs/kernel_read_file: Split into separate include file
>    IMA: Add support for file reads without contents
>    firmware: Add request_partial_firmware_into_buf()
>    test_firmware: Test partial read support
>
>   drivers/base/firmware_loader/fallback.c       |  19 +-
>   drivers/base/firmware_loader/fallback.h       |   5 +-
>   .../base/firmware_loader/fallback_platform.c  |  16 +-
>   drivers/base/firmware_loader/firmware.h       |   7 +-
>   drivers/base/firmware_loader/main.c           | 143 ++++++++++---
>   drivers/firmware/efi/embedded-firmware.c      |  21 +-
>   drivers/firmware/efi/embedded-firmware.h      |  19 ++
>   fs/Makefile                                   |   3 +-
>   fs/exec.c                                     | 132 +-----------
>   fs/kernel_read_file.c                         | 189 ++++++++++++++++++
>   include/linux/efi_embedded_fw.h               |  13 --
>   include/linux/firmware.h                      |  12 ++
>   include/linux/fs.h                            |  39 ----
>   include/linux/ima.h                           |  19 +-
>   include/linux/kernel_read_file.h              |  55 +++++
>   include/linux/lsm_hook_defs.h                 |   6 +-
>   include/linux/lsm_hooks.h                     |  12 ++
>   include/linux/security.h                      |  19 +-
>   kernel/kexec.c                                |   2 +-
>   kernel/kexec_file.c                           |  19 +-
>   kernel/module.c                               |  24 ++-
>   lib/test_firmware.c                           | 159 +++++++++++++--
>   security/integrity/digsig.c                   |   8 +-
>   security/integrity/ima/ima_fs.c               |  10 +-
>   security/integrity/ima/ima_main.c             |  70 +++++--
>   security/integrity/ima/ima_policy.c           |   1 +
>   security/loadpin/loadpin.c                    |  17 +-
>   security/security.c                           |  26 ++-
>   security/selinux/hooks.c                      |   8 +-
>   .../selftests/firmware/fw_filesystem.sh       |  91 +++++++++
>   tools/testing/selftests/firmware/settings     |   8 +
>   tools/testing/selftests/kselftest/runner.sh   |   6 +-
>   32 files changed, 860 insertions(+), 318 deletions(-)
>   create mode 100644 drivers/firmware/efi/embedded-firmware.h
>   create mode 100644 fs/kernel_read_file.c
>   create mode 100644 include/linux/kernel_read_file.h
>   create mode 100644 tools/testing/selftests/firmware/settings