netdev - RE: [PATCH v2 0/6] bpf-lsm: Extend interoperability with IMA

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Date:   Fri, 18 Feb 2022 15:01:57 +0000
From:   Roberto Sassu <roberto.sassu@...wei.com>
To:     "zohar@...ux.ibm.com" <zohar@...ux.ibm.com>,
        "shuah@...nel.org" <shuah@...nel.org>,
        "ast@...nel.org" <ast@...nel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "andrii@...nel.org" <andrii@...nel.org>,
        "kpsingh@...nel.org" <kpsingh@...nel.org>,
        "revest@...omium.org" <revest@...omium.org>
CC:     "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 0/6] bpf-lsm: Extend interoperability with IMA

> From: Roberto Sassu
> Sent: Tuesday, February 15, 2022 1:41 PM
> Extend the interoperability with IMA, to give wider flexibility for the
> implementation of integrity-focused LSMs based on eBPF.
> 
> Patch 1 fixes some style issues.
> 
> Patches 2-4 gives the ability to eBPF-based LSMs to take advantage of the
> measurement capability of IMA without needing to setup a policy in IMA
> (those LSMs might implement the policy capability themselves).
> 
> Patches 5-6 allows eBPF-based LSMs to evaluate files read by the kernel.

Hi everyone

I published the new DIGLIM eBPF, that takes advantage of
the new features introduced with this patch set:

https://github.com/robertosassu/diglim-ebpf

the eBPF program is in ebpf/diglim_kern.c

If you could have a look and give me some comments
or suggestions, it would be very appreciated!

Thanks

Roberto

HUAWEI TECHNOLOGIES Duesseldorf GmbH, HRB 56063
Managing Director: Li Peng, Zhong Ronghua

> Changelog
> 
> v1:
> - Modify ima_file_hash() only and allow the usage of the function with the
>   modified behavior by eBPF-based LSMs through the new function
>   bpf_ima_file_hash() (suggested by Mimi)
> - Make bpf_lsm_kernel_read_file() sleepable so that bpf_ima_inode_hash()
>   and bpf_ima_file_hash() can be called inside the implementation of
>   eBPF-based LSMs for this hook
> 
> Roberto Sassu (6):
>   ima: Fix documentation-related warnings in ima_main.c
>   ima: Always return a file measurement in ima_file_hash()
>   bpf-lsm: Introduce new helper bpf_ima_file_hash()
>   selftests/bpf: Add test for bpf_ima_file_hash()
>   bpf-lsm: Make bpf_lsm_kernel_read_file() as sleepable
>   selftests/bpf: Add test for bpf_lsm_kernel_read_file()
> 
>  include/uapi/linux/bpf.h                      | 11 +++++
>  kernel/bpf/bpf_lsm.c                          | 21 +++++++++
>  security/integrity/ima/ima_main.c             | 47 ++++++++++++-------
>  tools/include/uapi/linux/bpf.h                | 11 +++++
>  tools/testing/selftests/bpf/ima_setup.sh      |  2 +
>  .../selftests/bpf/prog_tests/test_ima.c       | 30 ++++++++++--
>  tools/testing/selftests/bpf/progs/ima.c       | 34 ++++++++++++--
>  7 files changed, 132 insertions(+), 24 deletions(-)
> 
> --
> 2.32.0