linux-kernel - Re: [RFC 0/2] ima: evm: Add kernel cmdline options to disable IMA/EVM

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Message-ID: <6CD5F54D-E4CD-4B6E-AA73-4DC3F72ACF03@fb.com>
Date: Tue, 17 Dec 2024 22:02:26 +0000
From: Song Liu <songliubraving@...a.com>
To: Casey Schaufler <casey@...aufler-ca.com>
CC: Song Liu <song@...nel.org>,
        "linux-fsdevel@...r.kernel.org"
	<linux-fsdevel@...r.kernel.org>,
        "linux-integrity@...r.kernel.org"
	<linux-integrity@...r.kernel.org>,
        "linux-security-module@...r.kernel.org"
	<linux-security-module@...r.kernel.org>,
        "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>,
        "roberto.sassu@...wei.com"
	<roberto.sassu@...wei.com>,
        "dmitry.kasatkin@...il.com"
	<dmitry.kasatkin@...il.com>,
        "eric.snowberg@...cle.com"
	<eric.snowberg@...cle.com>,
        "paul@...l-moore.com" <paul@...l-moore.com>,
        "jmorris@...ei.org" <jmorris@...ei.org>,
        "serge@...lyn.com"
	<serge@...lyn.com>,
        Kernel Team <kernel-team@...a.com>,
        "brauner@...nel.org"
	<brauner@...nel.org>,
        "jack@...e.cz" <jack@...e.cz>,
        "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>
Subject: Re: [RFC 0/2] ima: evm: Add kernel cmdline options to disable IMA/EVM



> On Dec 17, 2024, at 1:29 PM, Casey Schaufler <casey@...aufler-ca.com> wrote:
> 
> On 12/17/2024 12:25 PM, Song Liu wrote:
>> While reading and testing LSM code, I found IMA/EVM consume per inode
>> storage even when they are not in use. Add options to diable them in
>> kernel command line. The logic and syntax is mostly borrowed from an
>> old serious [1].
> 
> Why not omit ima and evm from the lsm= parameter?

Both ima and evm have LSM_ORDER_LAST, so they are not controlled
by lsm= parameter. But we can probably change this behavior in 
ordered_lsm_parse(), so that ima and evm are controlled by lsm=. 

Thanks,
Song

> 
>> 
>> [1] https://lore.kernel.org/lkml/cover.1398259638.git.d.kasatkin@samsung.com/
>> 
>> Song Liu (2):
>>  ima: Add kernel parameter to disable IMA
>>  evm: Add kernel parameter to disable EVM
>> 
>> security/integrity/evm/evm.h       |  6 ++++++
>> security/integrity/evm/evm_main.c  | 22 ++++++++++++++--------
>> security/integrity/evm/evm_secfs.c |  3 ++-
>> security/integrity/ima/ima_main.c  | 13 +++++++++++++
>> 4 files changed, 35 insertions(+), 9 deletions(-)
>> 
>> --
>> 2.43.5
>>