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Message-ID: <CAHC9VhR1kGT0+zM3smAQMEzGQLmVNhHu40f=YK3qavuYvcQYQQ@mail.gmail.com>
Date: Thu, 13 Oct 2022 18:47:42 -0400
From: Paul Moore <paul@...l-moore.com>
To: Kees Cook <keescook@...omium.org>
Cc: Mimi Zohar <zohar@...ux.ibm.com>,
Mickaël Salaün <mic@...ikod.net>,
KP Singh <kpsingh@...nel.org>,
Casey Schaufler <casey@...aufler-ca.com>,
John Johansen <john.johansen@...onical.com>,
James Morris <jmorris@...ei.org>, linux-kernel@...r.kernel.org,
linux-security-module@...r.kernel.org,
linux-integrity@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH 0/9] integrity: Move hooks into LSM
On Thu, Oct 13, 2022 at 6:36 PM Kees Cook <keescook@...omium.org> wrote:
>
> Hi,
>
> It's been over 4 years since LSM stack was introduced. The integrity
> subsystem is long overdue for moving to this infrastructure. Here's my
> first pass at converting integrity and ima (and some of evm) into LSM
> hooks. This should be enough of an example to finish evm, and introduce
> the missing hooks for both. For example, after this, it looks like ima
> only has a couple places it's still doing things outside of the LSM. At
> least these stood out:
>
> fs/namei.c: ima_post_create_tmpfile(mnt_userns, inode);
> fs/namei.c: ima_post_path_mknod(mnt_userns, dentry);
>
> Mimi, can you please take this series and finish the conversion for
> what's missing in ima and evm?
>
> I would also call attention to "175 insertions(+), 240 deletions(-)" --
> as expected, this is a net reduction in code.
>
> Thanks!
Without looking at any of the code, I just want to say this 100% gets
my vote; this is something we need to make happen at some point.
Thanks Kees!
> Kees Cook (9):
> integrity: Prepare for having "ima" and "evm" available in "integrity"
> LSM
> security: Move trivial IMA hooks into LSM
> ima: Move xattr hooks into LSM
> ima: Move ima_file_free() into LSM
> LSM: Introduce inode_post_setattr hook
> fs: Introduce file_to_perms() helper
> ima: Move ima_file_check() into LSM
> integrity: Move trivial hooks into LSM
> integrity: Move integrity_inode_get() out of global header
>
> fs/attr.c | 3 +-
> fs/file_table.c | 1 -
> fs/namei.c | 2 -
> fs/nfsd/vfs.c | 6 --
> include/linux/evm.h | 6 --
> include/linux/fs.h | 22 +++++++
> include/linux/ima.h | 87 ---------------------------
> include/linux/integrity.h | 30 +--------
> include/linux/lsm_hook_defs.h | 3 +
> security/Kconfig | 10 +--
> security/apparmor/include/file.h | 18 ++----
> security/integrity/evm/evm_main.c | 14 ++++-
> security/integrity/iint.c | 28 +++++++--
> security/integrity/ima/ima.h | 12 ++++
> security/integrity/ima/ima_appraise.c | 21 +++++--
> security/integrity/ima/ima_main.c | 66 ++++++++++++++------
> security/integrity/integrity.h | 8 +++
> security/security.c | 78 ++++++------------------
> 18 files changed, 175 insertions(+), 240 deletions(-)
--
paul-moore.com
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