From patchwork Tue Oct 22 16:09:57 2024 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: 13845932 Received: from smtp-42af.mail.infomaniak.ch (smtp-42af.mail.infomaniak.ch [84.16.66.175]) (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 906A11B5820; Tue, 22 Oct 2024 16:20:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=84.16.66.175 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729614015; cv=none; b=MLtgDxe4peb3D6Gdf5af/iJhTXONp7kX6LIEamWEoVLrNTxPlhmvhtHeSS2SE3g5FZvKCACxZx7b/3iHdekZCMt9R/s+0EC6/hPGunRpuB4M7PBuI1f3nrhfzVYfwyCCBto2RiX8MNxbcZy+9/8upaZ31JY6H+yRDk8yrsUcsME= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729614015; c=relaxed/simple; bh=JLUuaMewNefalK0VF7geq/iG13bGuquVBIL13UiR/ow=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=ndsYkUAxMv1CsX3NRWv1/hoEvpQ41JE5C2CJkQg5MqD+kXCddUJkDRDnO4pKPGCqbEdWUOfzEEJBeBwa+BntK2M9dk9bkbL8rK1saxtDHjQx6UqlrYHdKMBGLtYfJRuLXoXzl4RxfvioYtQqPTWUwElz2pPCUiSKXu1chnMOieU= 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=sLFPhCpu; arc=none smtp.client-ip=84.16.66.175 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="sLFPhCpu" Received: from smtp-4-0000.mail.infomaniak.ch (smtp-4-0000.mail.infomaniak.ch [10.7.10.107]) by smtp-4-3000.mail.infomaniak.ch (Postfix) with ESMTPS id 4XXxwY6VfPz18vj; Tue, 22 Oct 2024 18:10:21 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=digikod.net; s=20191114; t=1729613421; bh=0FnFFgSmLbIus3/9DTzYDbEac7m8xkhy5oAVYFXhDE0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=sLFPhCpuX34CUItsBRCSErx9d/sbZ90+YPrqznbkbqVEXlrVDKjywt9ugRu/5bmtS 79eBV2vS7ps0tiMRWP7CjMJ9ZNdXvEzdWaOwHW7QikYALNZCLQBwGADeWMXbPDGoxV L6tHO6WQOADXTs86wRH9YBUfjT55dUiwC0p9lWIM= Received: from unknown by smtp-4-0000.mail.infomaniak.ch (Postfix) with ESMTPA id 4XXxwX6vClzxbv; Tue, 22 Oct 2024 18:10:20 +0200 (CEST) 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 , James Morris , Jann Horn , Jeff Xu , Jorge Lucangeli Obes , Kees Cook , Konstantin Meskhidze , Matt Bobrowski , Mikhail Ivanov , Praveen K Paladugu , Robert Salvet , Shervin Oloumi , Song Liu , Tahera Fahimi , audit@vger.kernel.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [RFC PATCH v2 02/14] lsm: Add audit_log_lsm_data() helper Date: Tue, 22 Oct 2024 18:09:57 +0200 Message-ID: <20241022161009.982584-3-mic@digikod.net> In-Reply-To: <20241022161009.982584-1-mic@digikod.net> References: <20241022161009.982584-1-mic@digikod.net> Precedence: bulk X-Mailing-List: audit@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: Paul Moore Cc: Serge E. Hallyn Signed-off-by: Mickaël Salaün Link: https://lore.kernel.org/r/20241022161009.982584-3-mic@digikod.net --- 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 c2b01380262c..b62769a7c5fa 100644 --- a/include/linux/lsm_audit.h +++ b/include/linux/lsm_audit.h @@ -130,6 +130,9 @@ 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, @@ -138,6 +141,11 @@ 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 849e832719e2..de29ce8ff708 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, memcpy(comm, current->comm, sizeof(comm))); - switch (a->type) { case LSM_AUDIT_DATA_NONE: return; @@ -428,6 +422,21 @@ 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, memcpy(comm, current->comm, sizeof(comm))); + audit_log_lsm_data(ab, a); +} + /** * common_lsm_audit - generic LSM auditing function * @a: auxiliary audit data