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Thu, 15 Feb 2024 14:39:48 +0000 (UTC) From: Maurizio Lombardi To: michael.christie@oracle.com Cc: d.bogdanov@yadro.com, target-devel@vger.kernel.org, martin.petersen@oracle.com, linux-scsi@vger.kernel.org, james.bottomley@hansenpartnership.com Subject: [PATCH V2 1/2] target: fix selinux error when systemd-modules loads the target module Date: Thu, 15 Feb 2024 15:39:43 +0100 Message-Id: <20240215143944.847184-2-mlombard@redhat.com> In-Reply-To: <20240215143944.847184-1-mlombard@redhat.com> References: <20240215143944.847184-1-mlombard@redhat.com> Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.2 If the systemd-modules service loads the target module, the credentials of that userspace process will be used to validate the access to the target db directory. selinux will prevent it, reporting an error like the following: kernel: audit: type=1400 audit(1676301082.205:4): avc: denied { read } for pid=1020 comm="systemd-modules" name="target" dev="dm-3" ino=4657583 scontext=system_u:system_r:systemd_modules_load_t:s0 tcontext=system_u:object_r:targetd_etc_rw_t:s0 tclass=dir permissive=0 Fix the error by using the kernel credentials to access the db directory Signed-off-by: Maurizio Lombardi Reviewed-by: Mike Christie --- v2: call target_xcopy_release_pt() to destroy the xcopy_wq in case of failure drivers/target/target_core_configfs.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c index a5f58988130a..3f3dd0c0ce8c 100644 --- a/drivers/target/target_core_configfs.c +++ b/drivers/target/target_core_configfs.c @@ -3656,6 +3656,8 @@ static int __init target_core_init_configfs(void) { struct configfs_subsystem *subsys = &target_core_fabrics; struct t10_alua_lu_gp *lu_gp; + struct cred *kern_cred; + const struct cred *old_cred; int ret; pr_debug("TARGET_CORE[0]: Loading Generic Kernel Storage" @@ -3732,11 +3734,21 @@ static int __init target_core_init_configfs(void) if (ret < 0) goto out; + /* We use the kernel credentials to access the target directory */ + kern_cred = prepare_kernel_cred(&init_task); + if (!kern_cred) { + ret = -ENOMEM; + goto out; + } + old_cred = override_creds(kern_cred); target_init_dbroot(); + revert_creds(old_cred); + put_cred(kern_cred); return 0; out: + target_xcopy_release_pt(); configfs_unregister_subsystem(subsys); core_dev_release_virtual_lun0(); rd_module_exit(); From patchwork Thu Feb 15 14:39:44 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maurizio Lombardi X-Patchwork-Id: 773617 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 9240213246C for ; 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Thu, 15 Feb 2024 09:39:53 -0500 X-MC-Unique: xzAAwuTIN4WIZqtE8jyt-Q-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id A4B2138060E2; Thu, 15 Feb 2024 14:39:52 +0000 (UTC) Received: from kalibr.redhat.com (unknown [10.47.238.145]) by smtp.corp.redhat.com (Postfix) with ESMTP id C7BFC40C106C; Thu, 15 Feb 2024 14:39:50 +0000 (UTC) From: Maurizio Lombardi To: michael.christie@oracle.com Cc: d.bogdanov@yadro.com, target-devel@vger.kernel.org, martin.petersen@oracle.com, linux-scsi@vger.kernel.org, james.bottomley@hansenpartnership.com Subject: [PATCH V2 2/2] target: set the xcopy_wq pointer to NULL after free. Date: Thu, 15 Feb 2024 15:39:44 +0100 Message-Id: <20240215143944.847184-3-mlombard@redhat.com> In-Reply-To: <20240215143944.847184-1-mlombard@redhat.com> References: <20240215143944.847184-1-mlombard@redhat.com> Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.2 Do not leave a dangling pointer after free. Signed-off-by: Maurizio Lombardi --- drivers/target/target_core_xcopy.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/target/target_core_xcopy.c b/drivers/target/target_core_xcopy.c index 4128631c9dfd..1f79da0041e3 100644 --- a/drivers/target/target_core_xcopy.c +++ b/drivers/target/target_core_xcopy.c @@ -491,8 +491,10 @@ int target_xcopy_setup_pt(void) void target_xcopy_release_pt(void) { - if (xcopy_wq) + if (xcopy_wq) { destroy_workqueue(xcopy_wq); + xcopy_wq = NULL; + } } /*