The audit-related parameters in struct task_struct should ideally be collected together and accessed through a standard audit API. Collect the existing loginuid, sessionid and audit_context together in a new struct audit_task_info pointer called "audit" in struct task_struct. Use kmem_cache to manage this pool of memory. Un-inline audit_free() to be able to always recover that memory. See: https://github.com/linux-audit/audit-kernel/issues/81 Signed-off-by: Richard Guy Briggs <rgb@xxxxxxxxxx> --- MAINTAINERS | 2 +- include/linux/audit.h | 8 ++++---- include/linux/audit_task.h | 31 +++++++++++++++++++++++++++++++ include/linux/sched.h | 6 ++---- init/init_task.c | 8 ++++++-- kernel/auditsc.c | 4 ++-- 6 files changed, 46 insertions(+), 13 deletions(-) create mode 100644 include/linux/audit_task.h diff --git a/MAINTAINERS b/MAINTAINERS index 0a1410d..8c7992d 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2510,7 +2510,7 @@ L: linux-audit@xxxxxxxxxx (moderated for non-subscribers) W: https://github.com/linux-audit T: git git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit.git S: Supported -F: include/linux/audit.h +F: include/linux/audit*.h F: include/uapi/linux/audit.h F: kernel/audit* diff --git a/include/linux/audit.h b/include/linux/audit.h index dba0d45..1324969 100644 --- a/include/linux/audit.h +++ b/include/linux/audit.h @@ -237,11 +237,11 @@ extern void __audit_inode_child(struct inode *parent, static inline void audit_set_context(struct task_struct *task, struct audit_context *ctx) { - task->audit_context = ctx; + task->audit.ctx = ctx; } static inline struct audit_context *audit_context(struct task_struct *task) { - return task->audit_context; + return task->audit.ctx; } static inline bool audit_dummy_context(void) { @@ -330,12 +330,12 @@ extern int auditsc_get_stamp(struct audit_context *ctx, static inline kuid_t audit_get_loginuid(struct task_struct *tsk) { - return tsk->loginuid; + return tsk->audit.loginuid; } static inline unsigned int audit_get_sessionid(struct task_struct *tsk) { - return tsk->sessionid; + return tsk->audit.sessionid; } extern void __audit_ipc_obj(struct kern_ipc_perm *ipcp); diff --git a/include/linux/audit_task.h b/include/linux/audit_task.h new file mode 100644 index 0000000..d4b3a20 --- /dev/null +++ b/include/linux/audit_task.h @@ -0,0 +1,31 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* audit_task.h -- definition of audit_task_info structure + * + * Copyright 2018 Red Hat Inc., Raleigh, North Carolina. + * All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * Written by Richard Guy Briggs <rgb@xxxxxxxxxx> + * + */ + +#ifndef _LINUX_AUDIT_TASK_H_ +#define _LINUX_AUDIT_TASK_H_ + +struct audit_context; +struct audit_task_info { + kuid_t loginuid; + unsigned int sessionid; + struct audit_context *ctx; +}; + +#endif diff --git a/include/linux/sched.h b/include/linux/sched.h index b3d697f..b58eca0 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -27,9 +27,9 @@ #include <linux/signal_types.h> #include <linux/mm_types_task.h> #include <linux/task_io_accounting.h> +#include <linux/audit_task.h> /* task_struct member predeclarations (sorted alphabetically): */ -struct audit_context; struct backing_dev_info; struct bio_list; struct blk_plug; @@ -832,10 +832,8 @@ struct task_struct { struct callback_head *task_works; - struct audit_context *audit_context; #ifdef CONFIG_AUDITSYSCALL - kuid_t loginuid; - unsigned int sessionid; + struct audit_task_info audit; #endif struct seccomp seccomp; diff --git a/init/init_task.c b/init/init_task.c index c788f91..d33260d 100644 --- a/init/init_task.c +++ b/init/init_task.c @@ -9,6 +9,7 @@ #include <linux/init.h> #include <linux/fs.h> #include <linux/mm.h> +#include <linux/audit.h> #include <asm/pgtable.h> #include <linux/uaccess.h> @@ -118,8 +119,11 @@ struct task_struct init_task .thread_group = LIST_HEAD_INIT(init_task.thread_group), .thread_node = LIST_HEAD_INIT(init_signals.thread_head), #ifdef CONFIG_AUDITSYSCALL - .loginuid = INVALID_UID, - .sessionid = AUDIT_SID_UNSET, + .audit = { + .loginuid = INVALID_UID, + .sessionid = AUDIT_SID_UNSET, + .ctx = NULL, + }, #endif #ifdef CONFIG_PERF_EVENTS .perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex), diff --git a/kernel/auditsc.c b/kernel/auditsc.c index f294e4a..b5d8bff 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -2068,8 +2068,8 @@ int audit_set_loginuid(kuid_t loginuid) sessionid = (unsigned int)atomic_inc_return(&session_id); } - task->sessionid = sessionid; - task->loginuid = loginuid; + task->audit.sessionid = sessionid; + task->audit.loginuid = loginuid; out: audit_log_set_loginuid(oldloginuid, loginuid, oldsessionid, sessionid, rc); return rc; -- 1.8.3.1
