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3w4J4kzs.QItUXljISmBp Received: from sonic.gate.mail.ne1.yahoo.com by sonic302.consmr.mail.gq1.yahoo.com with HTTP; Mon, 16 Jul 2018 18:23:07 +0000 Received: from c-67-169-65-224.hsd1.ca.comcast.net (EHLO [192.168.0.100]) ([67.169.65.224]) by smtp424.mail.gq1.yahoo.com (Oath Hermes SMTP Server) with ESMTPA ID 5b9c95488b3f250528426e48e5db8f36; Mon, 16 Jul 2018 18:23:03 +0000 (UTC) To: LSM , LKLM , Paul Moore , Stephen Smalley , SE Linux , "SMACK-discuss@lists.01.org" , John Johansen , Kees Cook , Tetsuo Handa , James Morris References: <8a325db8-e7eb-9581-2b77-fc987a165df7@schaufler-ca.com> X-EEMSG-check-009: 444-444 From: Casey Schaufler Message-ID: <6bc34d62-508c-eab7-4c67-cbeb240c794c@schaufler-ca.com> Date: Mon, 16 Jul 2018 11:23:00 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <8a325db8-e7eb-9581-2b77-fc987a165df7@schaufler-ca.com> Content-Language: en-US X-Mailman-Approved-At: Mon, 16 Jul 2018 14:38:37 -0400 Subject: [PATCH v1 07/22] LSM: Infrastructure management of the task security blob X-BeenThere: selinux@tycho.nsa.gov X-Mailman-Version: 2.1.21 Precedence: list List-Id: "Security-Enhanced Linux \(SELinux\) mailing list" List-Post: List-Help: Cc: "Schaufler, Casey" Errors-To: selinux-bounces@tycho.nsa.gov Sender: "Selinux" X-Virus-Scanned: ClamAV using ClamSMTP LSM: Infrastructure management of the task security blob Move management of the task_struct->security blob out of the individual security modules and into the security infrastructure. Instead of allocating the blobs from within the modules the modules tell the infrastructure how much space is required, and the space is allocated there. Signed-off-by: Casey Schaufler --- include/linux/lsm_hooks.h | 2 ++ security/apparmor/include/task.h | 18 +++-------- security/apparmor/lsm.c | 15 ++------- security/security.c | 54 +++++++++++++++++++++++++++++++- 4 files changed, 62 insertions(+), 27 deletions(-) diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h index ff8928dac619..00c6bdaf5cc1 100644 --- a/include/linux/lsm_hooks.h +++ b/include/linux/lsm_hooks.h @@ -2024,6 +2024,7 @@ struct security_hook_list { struct lsm_blob_sizes { int lbs_cred; int lbs_file; + int lbs_task; }; /* @@ -2089,6 +2090,7 @@ extern int lsm_cred_alloc(struct cred *cred, gfp_t gfp); #ifdef CONFIG_SECURITY void lsm_early_cred(struct cred *cred); +void lsm_early_task(struct task_struct *task); #endif #endif /* ! __LINUX_LSM_HOOKS_H */ diff --git a/security/apparmor/include/task.h b/security/apparmor/include/task.h index 55edaa1d83f8..039c1e60887a 100644 --- a/security/apparmor/include/task.h +++ b/security/apparmor/include/task.h @@ -14,7 +14,10 @@ #ifndef __AA_TASK_H #define __AA_TASK_H -#define task_ctx(X) ((X)->security) +static inline struct aa_task_ctx *task_ctx(struct task_struct *task) +{ + return task->security; +} /* * struct aa_task_ctx - information for current task label change @@ -36,17 +39,6 @@ int aa_set_current_hat(struct aa_label *label, u64 token); int aa_restore_previous_label(u64 cookie); struct aa_label *aa_get_task_label(struct task_struct *task); -/** - * aa_alloc_task_ctx - allocate a new task_ctx - * @flags: gfp flags for allocation - * - * Returns: allocated buffer or NULL on failure - */ -static inline struct aa_task_ctx *aa_alloc_task_ctx(gfp_t flags) -{ - return kzalloc(sizeof(struct aa_task_ctx), flags); -} - /** * aa_free_task_ctx - free a task_ctx * @ctx: task_ctx to free (MAYBE NULL) @@ -57,8 +49,6 @@ static inline void aa_free_task_ctx(struct aa_task_ctx *ctx) aa_put_label(ctx->nnp); aa_put_label(ctx->previous); aa_put_label(ctx->onexec); - - kzfree(ctx); } } diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c index 271d96c39129..665dd723100f 100644 --- a/security/apparmor/lsm.c +++ b/security/apparmor/lsm.c @@ -91,19 +91,14 @@ static void apparmor_task_free(struct task_struct *task) { aa_free_task_ctx(task_ctx(task)); - task_ctx(task) = NULL; } static int apparmor_task_alloc(struct task_struct *task, unsigned long clone_flags) { - struct aa_task_ctx *new = aa_alloc_task_ctx(GFP_KERNEL); - - if (!new) - return -ENOMEM; + struct aa_task_ctx *new = task_ctx(task); aa_dup_task_ctx(new, task_ctx(current)); - task_ctx(task) = new; return 0; } @@ -1132,6 +1127,7 @@ static void apparmor_sock_graft(struct sock *sk, struct socket *parent) struct lsm_blob_sizes apparmor_blob_sizes = { .lbs_cred = sizeof(struct aa_task_ctx *), .lbs_file = sizeof(struct aa_file_ctx), + .lbs_task = sizeof(struct aa_task_ctx), }; static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = { @@ -1457,15 +1453,10 @@ static int param_set_mode(const char *val, const struct kernel_param *kp) static int __init set_init_ctx(void) { struct cred *cred = (struct cred *)current->real_cred; - struct aa_task_ctx *ctx; - - ctx = aa_alloc_task_ctx(GFP_KERNEL); - if (!ctx) - return -ENOMEM; lsm_early_cred(cred); + lsm_early_task(current); set_cred_label(cred, aa_get_label(ns_unconfined(root_ns))); - task_ctx(current) = ctx; return 0; } diff --git a/security/security.c b/security/security.c index cec46acb4061..40624fb81031 100644 --- a/security/security.c +++ b/security/security.c @@ -108,6 +108,7 @@ int __init security_init(void) #ifdef CONFIG_SECURITY_LSM_DEBUG pr_info("LSM: cred blob size = %d\n", blob_sizes.lbs_cred); pr_info("LSM: file blob size = %d\n", blob_sizes.lbs_file); + pr_info("LSM: task blob size = %d\n", blob_sizes.lbs_task); #endif return 0; @@ -283,6 +284,7 @@ void __init security_add_blobs(struct lsm_blob_sizes *needed) { lsm_set_size(&needed->lbs_cred, &blob_sizes.lbs_cred); lsm_set_size(&needed->lbs_file, &blob_sizes.lbs_file); + lsm_set_size(&needed->lbs_task, &blob_sizes.lbs_task); } /** @@ -306,6 +308,46 @@ int lsm_file_alloc(struct file *file) return 0; } +/** + * lsm_task_alloc - allocate a composite task blob + * @task: the task that needs a blob + * + * Allocate the task blob for all the modules + * + * Returns 0, or -ENOMEM if memory can't be allocated. + */ +int lsm_task_alloc(struct task_struct *task) +{ + if (blob_sizes.lbs_task == 0) { + task->security = NULL; + return 0; + } + + task->security = kzalloc(blob_sizes.lbs_task, GFP_KERNEL); + if (task->security == NULL) + return -ENOMEM; + return 0; +} + +/** + * lsm_early_task - during initialization allocate a composite task blob + * @task: the task that needs a blob + * + * Allocate the task blob for all the modules if it's not already there + */ +void lsm_early_task(struct task_struct *task) +{ + int rc; + + if (task == NULL) + panic("%s: task cred.\n", __func__); + if (task->security != NULL) + return; + rc = lsm_task_alloc(task); + if (rc) + panic("%s: Early task alloc failed.\n", __func__); +} + /* * Hook list operation macros. * @@ -1112,12 +1154,22 @@ int security_file_open(struct file *file, const struct cred *cred) int security_task_alloc(struct task_struct *task, unsigned long clone_flags) { - return call_int_hook(task_alloc, 0, task, clone_flags); + int rc = lsm_task_alloc(task); + + if (rc) + return rc; + rc = call_int_hook(task_alloc, 0, task, clone_flags); + if (unlikely(rc)) + security_task_free(task); + return rc; } void security_task_free(struct task_struct *task) { call_void_hook(task_free, task); + + kfree(task->security); + task->security = NULL; } int security_cred_alloc_blank(struct cred *cred, gfp_t gfp)