From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1fZzz6-0002uP-E8 for kexec@lists.infradead.org; Mon, 02 Jul 2018 14:39:30 +0000 Received: from pps.filterd (m0098396.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w62EcgIc117144 for ; Mon, 2 Jul 2018 10:39:14 -0400 Received: from e06smtp01.uk.ibm.com (e06smtp01.uk.ibm.com [195.75.94.97]) by mx0a-001b2d01.pphosted.com with ESMTP id 2jymmguspa-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 02 Jul 2018 10:39:13 -0400 Received: from localhost by e06smtp01.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 2 Jul 2018 15:39:11 +0100 From: Mimi Zohar Subject: [PATCH v5 8/8] module: replace the existing LSM hook in init_module Date: Mon, 2 Jul 2018 10:38:03 -0400 In-Reply-To: <1530542283-26145-1-git-send-email-zohar@linux.vnet.ibm.com> References: <1530542283-26145-1-git-send-email-zohar@linux.vnet.ibm.com> Message-Id: <1530542283-26145-9-git-send-email-zohar@linux.vnet.ibm.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: linux-integrity@vger.kernel.org Cc: Andres Rodriguez , Kees Cook , Ard Biesheuvel , Greg Kroah-Hartman , kexec@lists.infradead.org, linux-kernel@vger.kernel.org, David Howells , linux-security-module@vger.kernel.org, Eric Biederman , Jeff Vander Stoep , Casey Schaufler , Mimi Zohar , "Luis R . Rodriguez" Both the init_module and finit_module syscalls call either directly or indirectly the security_kernel_read_file LSM hook. This patch replaces the direct call in init_module with a call to the new security_kernel_load_data hook and makes the corresponding changes in SELinux, LoadPin, and IMA. Signed-off-by: Mimi Zohar Cc: Jeff Vander Stoep Cc: Casey Schaufler Cc: Kees Cook Acked-by: Jessica Yu Acked-by: Paul Moore --- Changelog v5: - For SELinux, have both the security_kernel_read_file and security_kernel_load_data LSM hooks call selinux_kernel_read_file(). - LoadPin: replace existing init_module LSM hook support with new security_kernel_load_data hook. kernel/module.c | 2 +- security/integrity/ima/ima_main.c | 24 ++++++++++-------------- security/loadpin/loadpin.c | 6 ++++++ security/selinux/hooks.c | 15 +++++++++++++++ 4 files changed, 32 insertions(+), 15 deletions(-) diff --git a/kernel/module.c b/kernel/module.c index f475f30eed8c..a7615d661910 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -2876,7 +2876,7 @@ static int copy_module_from_user(const void __user *umod, unsigned long len, if (info->len < sizeof(*(info->hdr))) return -ENOEXEC; - err = security_kernel_read_file(NULL, READING_MODULE); + err = security_kernel_load_data(LOADING_MODULE); if (err) return err; diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 7da123d980ea..166670e418ca 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -438,17 +438,6 @@ static int read_idmap[READING_MAX_ID] = { */ int ima_read_file(struct file *file, enum kernel_read_file_id read_id) { - bool sig_enforce = is_module_sig_enforced(); - - if (!file && read_id == READING_MODULE) { - if (!sig_enforce && (ima_appraise & IMA_APPRAISE_MODULES) && - (ima_appraise & IMA_APPRAISE_ENFORCE)) { - pr_err("impossible to appraise a module without a file descriptor. sig_enforce kernel parameter might help\n"); - return -EACCES; /* INTEGRITY_UNKNOWN */ - } - return 0; /* We rely on module signature checking */ - } - if (read_id == READING_FIRMWARE_PREALLOC_BUFFER) { if ((ima_appraise & IMA_APPRAISE_FIRMWARE) && (ima_appraise & IMA_APPRAISE_ENFORCE)) { @@ -486,9 +475,6 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size, return 0; } - if (!file && read_id == READING_MODULE) /* MODULE_SIG_FORCE enabled */ - return 0; - /* permit signed certs */ if (!file && read_id == READING_X509_CERTIFICATE) return 0; @@ -517,6 +503,8 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size, */ int ima_load_data(enum kernel_load_data_id id) { + bool sig_enforce; + if ((ima_appraise & IMA_APPRAISE_ENFORCE) != IMA_APPRAISE_ENFORCE) return 0; @@ -532,6 +520,14 @@ int ima_load_data(enum kernel_load_data_id id) pr_err("Prevent firmware sysfs fallback loading.\n"); return -EACCES; /* INTEGRITY_UNKNOWN */ } + break; + case LOADING_MODULE: + sig_enforce = is_module_sig_enforced(); + + if (!sig_enforce && (ima_appraise & IMA_APPRAISE_MODULES)) { + pr_err("impossible to appraise a module without a file descriptor. sig_enforce kernel parameter might help\n"); + return -EACCES; /* INTEGRITY_UNKNOWN */ + } default: break; } diff --git a/security/loadpin/loadpin.c b/security/loadpin/loadpin.c index 5fa191252c8f..c5dfd0dcbb2b 100644 --- a/security/loadpin/loadpin.c +++ b/security/loadpin/loadpin.c @@ -173,9 +173,15 @@ static int loadpin_read_file(struct file *file, enum kernel_read_file_id id) return 0; } +static int loadpin_load_data(enum kernel_load_data_id id) +{ + return loadpin_read_file(NULL, id); +} + static struct security_hook_list loadpin_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(sb_free_security, loadpin_sb_free_security), LSM_HOOK_INIT(kernel_read_file, loadpin_read_file), + LSM_HOOK_INIT(kernel_load_data, loadpin_load_data), }; void __init loadpin_add_hooks(void) diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 2b5ee5fbd652..a8bf324130f5 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -4073,6 +4073,20 @@ static int selinux_kernel_read_file(struct file *file, return rc; } +static int selinux_kernel_load_data(enum kernel_load_data_id id) +{ + int rc = 0; + + switch (id) { + case LOADING_MODULE: + rc = selinux_kernel_module_from_file(NULL); + default: + break; + } + + return rc; +} + static int selinux_task_setpgid(struct task_struct *p, pid_t pgid) { return avc_has_perm(&selinux_state, @@ -6972,6 +6986,7 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(kernel_act_as, selinux_kernel_act_as), LSM_HOOK_INIT(kernel_create_files_as, selinux_kernel_create_files_as), LSM_HOOK_INIT(kernel_module_request, selinux_kernel_module_request), + LSM_HOOK_INIT(kernel_load_data, selinux_kernel_load_data), LSM_HOOK_INIT(kernel_read_file, selinux_kernel_read_file), LSM_HOOK_INIT(task_setpgid, selinux_task_setpgid), LSM_HOOK_INIT(task_getpgid, selinux_task_getpgid), -- 2.7.5 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec