From patchwork Sat Mar 8 18:43:57 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Micka=C3=ABl_Sala=C3=BCn?= X-Patchwork-Id: 14007672 X-Patchwork-Delegate: paul@paul-moore.com Received: from smtp-42a9.mail.infomaniak.ch (smtp-42a9.mail.infomaniak.ch [84.16.66.169]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B676F15E5DC for ; Sat, 8 Mar 2025 18:44:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=84.16.66.169 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741459486; cv=none; b=IAOFLFLKGVCWsm2pZ4ttk6tmf9RfQjVoUz7Nm67SYncrvPm2KJsE8CmNnD5UXy/Qx2ShTBOwzRdJW4LVjPQ1VlrD9KNggJU6f2LTKtZOJvgZczSMWp/McrOZ5GONxIStYEfT19u3GV99A5T5DH2JeSnO2U1dE2BJmV96cBJLYIg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741459486; c=relaxed/simple; bh=mBOPs9rzB+SeHsLDPQt3VFlTdlYzvqYWGa2aaMV/u6Q=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=jDpVdTKuEgKC1a/21X4JpfO5xg5YrQPKMSdKfVzbSHh4MYiTGa77hHkkrAUTg5yMP/Ff1HyI06tV/42AA7iqI6UHQQ7s2AsoiDaPbUxLe1d969330pixUjGQE+z4OAsE19/G6YqvVRKgfydBHkqwSToZPVLC8LlBqDn5XcRScik= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=digikod.net; spf=pass smtp.mailfrom=digikod.net; dkim=pass (1024-bit key) header.d=digikod.net header.i=@digikod.net header.b=F2tABzZu; arc=none smtp.client-ip=84.16.66.169 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=digikod.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=digikod.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=digikod.net header.i=@digikod.net header.b="F2tABzZu" Received: from smtp-4-0000.mail.infomaniak.ch (unknown [IPv6:2001:1600:7:10:40ca:feff:fe05:0]) by smtp-4-3000.mail.infomaniak.ch (Postfix) with ESMTPS id 4Z9BsH0nzrzStD; Sat, 8 Mar 2025 19:44:35 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=digikod.net; s=20191114; t=1741459474; bh=DdXEvEUEuCzLG8T1qTLKV770RvuwQMh1ndZL3ZZ5Fog=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=F2tABzZu0/Rfs7Wqlj4a0GCX2qkywtqTgBoByqViaPBz9hy72uCWH8PmALdcklc5F jsYJvQnPdhFbT8W2WGY2xJ9/7v6rMTXcZqPO8/lqXLYj4l628MUN1NEBsiwuSTkrjU RYAiuJt+EnHtm0WZ4GAjTuxyCCQ8zXGAkHmztl54= Received: from unknown by smtp-4-0000.mail.infomaniak.ch (Postfix) with ESMTPA id 4Z9BsG2gYSzH7H; Sat, 8 Mar 2025 19:44:34 +0100 (CET) From: =?utf-8?q?Micka=C3=ABl_Sala=C3=BCn?= To: Eric Paris , Paul Moore , =?utf-8?q?G=C3=BCnther_Noack?= , "Serge E . Hallyn" Cc: =?utf-8?q?Micka=C3=ABl_Sala=C3=BCn?= , Ben Scarlato , Casey Schaufler , Charles Zaffery , Daniel Burgener , Francis Laniel , James Morris , Jann Horn , Jeff Xu , Jorge Lucangeli Obes , Kees Cook , Konstantin Meskhidze , Matt Bobrowski , Mikhail Ivanov , Phil Sutter , Praveen K Paladugu , Robert Salvet , Shervin Oloumi , Song Liu , Tahera Fahimi , Tingmao Wang , Tyler Hicks , audit@vger.kernel.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH v6 01/26] lsm: Add audit_log_lsm_data() helper Date: Sat, 8 Mar 2025 19:43:57 +0100 Message-ID: <20250308184422.2159360-2-mic@digikod.net> In-Reply-To: <20250308184422.2159360-1-mic@digikod.net> References: <20250308184422.2159360-1-mic@digikod.net> Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Infomaniak-Routing: alpha Extract code from dump_common_audit_data() into the audit_log_lsm_data() helper. This helps reuse common LSM audit data while not abusing AUDIT_AVC records because of the common_lsm_audit() helper. Cc: Casey Schaufler Cc: James Morris Cc: Serge E. Hallyn Acked-by: Paul Moore Depends-on: 7ccbe076d987 ("lsm: Only build lsm_audit.c if CONFIG_SECURITY and CONFIG_AUDIT are set") Signed-off-by: Mickaël Salaün Link: https://lore.kernel.org/r/20250308184422.2159360-2-mic@digikod.net --- Changes since v4: - Add Depends-on tag. Changes since v3: - Rebase on top of the v6.13's get_task_comm() fix. - Add Acked-by Paul. Changes since v1: - Fix commit message (spotted by Paul). - Constify dump_common_audit_data()'s and audit_log_lsm_data()'s "a" argument. - Fix build without CONFIG_NET: see previous patch. --- include/linux/lsm_audit.h | 8 ++++++++ security/lsm_audit.c | 27 ++++++++++++++++++--------- 2 files changed, 26 insertions(+), 9 deletions(-) diff --git a/include/linux/lsm_audit.h b/include/linux/lsm_audit.h index e13d2f947b51..bddd694f7c4c 100644 --- a/include/linux/lsm_audit.h +++ b/include/linux/lsm_audit.h @@ -132,6 +132,9 @@ void common_lsm_audit(struct common_audit_data *a, void (*pre_audit)(struct audit_buffer *, void *), void (*post_audit)(struct audit_buffer *, void *)); +void audit_log_lsm_data(struct audit_buffer *ab, + const struct common_audit_data *a); + #else /* CONFIG_AUDIT */ static inline void common_lsm_audit(struct common_audit_data *a, @@ -140,6 +143,11 @@ static inline void common_lsm_audit(struct common_audit_data *a, { } +static inline void audit_log_lsm_data(struct audit_buffer *ab, + const struct common_audit_data *a) +{ +} + #endif /* CONFIG_AUDIT */ #endif diff --git a/security/lsm_audit.c b/security/lsm_audit.c index 52db886dbba8..a61c7ebdb6a7 100644 --- a/security/lsm_audit.c +++ b/security/lsm_audit.c @@ -189,16 +189,13 @@ static inline void print_ipv4_addr(struct audit_buffer *ab, __be32 addr, } /** - * dump_common_audit_data - helper to dump common audit data + * audit_log_lsm_data - helper to log common LSM audit data * @ab : the audit buffer * @a : common audit data - * */ -static void dump_common_audit_data(struct audit_buffer *ab, - struct common_audit_data *a) +void audit_log_lsm_data(struct audit_buffer *ab, + const struct common_audit_data *a) { - char comm[sizeof(current->comm)]; - /* * To keep stack sizes in check force programmers to notice if they * start making this union too large! See struct lsm_network_audit @@ -206,9 +203,6 @@ static void dump_common_audit_data(struct audit_buffer *ab, */ BUILD_BUG_ON(sizeof(a->u) > sizeof(void *)*2); - audit_log_format(ab, " pid=%d comm=", task_tgid_nr(current)); - audit_log_untrustedstring(ab, get_task_comm(comm, current)); - switch (a->type) { case LSM_AUDIT_DATA_NONE: return; @@ -431,6 +425,21 @@ static void dump_common_audit_data(struct audit_buffer *ab, } /* switch (a->type) */ } +/** + * dump_common_audit_data - helper to dump common audit data + * @ab : the audit buffer + * @a : common audit data + */ +static void dump_common_audit_data(struct audit_buffer *ab, + const struct common_audit_data *a) +{ + char comm[sizeof(current->comm)]; + + audit_log_format(ab, " pid=%d comm=", task_tgid_nr(current)); + audit_log_untrustedstring(ab, get_task_comm(comm, current)); + audit_log_lsm_data(ab, a); +} + /** * common_lsm_audit - generic LSM auditing function * @a: auxiliary audit data