netdev - Re: [PATCH v4 6/20] lsm: Refactor return value of LSM hook getselfattr

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Message-ID: <6e79c031aa6c223df552726ac6537d44@paul-moore.com>
Date: Thu, 18 Jul 2024 22:08:04 -0400
From: Paul Moore <paul@...l-moore.com>
To: Xu Kuohai <xukuohai@...weicloud.com>, bpf@...r.kernel.org, netdev@...r.kernel.org, linux-security-module@...r.kernel.org, linux-kselftest@...r.kernel.org, linux-integrity@...r.kernel.org, apparmor@...ts.ubuntu.com, selinux@...r.kernel.org
Cc: Alexei Starovoitov <ast@...nel.org>, Andrii Nakryiko <andrii@...nel.org>, 
	Daniel Borkmann <daniel@...earbox.net>, Martin KaFai Lau <martin.lau@...ux.dev>, 
	Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>, 
	Yonghong Song <yonghong.song@...ux.dev>, John Fastabend <john.fastabend@...il.com>, 
	KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>, 
	Jiri Olsa <jolsa@...nel.org>, Matt Bobrowski <mattbobrowski@...gle.com>, 
	Brendan Jackman <jackmanb@...omium.org>, James Morris <jmorris@...ei.org>, 
	"Serge E . Hallyn" <serge@...lyn.com>, Khadija Kamran <kamrankhadijadj@...il.com>, 
	Casey Schaufler <casey@...aufler-ca.com>, Ondrej Mosnacek <omosnace@...hat.com>, 
	Kees Cook <keescook@...omium.org>, John Johansen <john.johansen@...onical.com>, 
	Lukas Bulwahn <lukas.bulwahn@...il.com>, Roberto Sassu <roberto.sassu@...wei.com>, 
	Shung-Hsi Yu <shung-hsi.yu@...e.com>, Edward Cree <ecree.xilinx@...il.com>, 
	Alexander Viro <viro@...iv.linux.org.uk>, Christian Brauner <brauner@...nel.org>, 
	Trond Myklebust <trond.myklebust@...merspace.com>, Anna Schumaker <anna@...nel.org>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Stephen Smalley <stephen.smalley.work@...il.com>
Subject: Re: [PATCH v4 6/20] lsm: Refactor return value of LSM hook getselfattr

On Jul 11, 2024 Xu Kuohai <xukuohai@...weicloud.com> wrote:
> 
> To be consistent with most LSM hooks, convert the return value of
> hook getselfattr to 0 or a negative error code.
> 
> Before:
> - Hook getselfattr returns number of attributes found on success
>   or a negative error code on failure.
> 
> After:
> - Hook getselfattr returns 0 on success or a negative error code
>   on failure. An output parameter @nattr is introduced to hold
>   the number of attributes found on success.
> 
> Signed-off-by: Xu Kuohai <xukuohai@...wei.com>
> ---
>  include/linux/lsm_hook_defs.h |  2 +-
>  include/linux/security.h      |  5 +++--
>  security/apparmor/lsm.c       |  5 +++--
>  security/lsm_syscalls.c       |  6 +++++-
>  security/security.c           | 18 +++++++++++-------
>  security/selinux/hooks.c      | 13 +++++++++----
>  security/smack/smack_lsm.c    | 13 +++++++++----
>  7 files changed, 41 insertions(+), 21 deletions(-)

The getselfattr hook is different from the majority of the other LSM
hooks as getselfattr is used as part of lsm_get_self_attr(2) syscall and
not by other subsystems within the kernel.  Let's leave it as-is for now
as it is sufficiently special case that a deviation is okay.

--
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