[PATCH ghak81 RFC V2 5/5] audit: collect audit task parameters
Richard Guy Briggs
rgb at redhat.com
Tue May 15 01:20:04 UTC 2018
On 2018-05-14 17:54, Paul Moore wrote:
> On Sat, May 12, 2018 at 9:58 PM, Richard Guy Briggs <rgb at redhat.com> wrote:
> > 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 called "audit" in struct task_struct.
> >
> > See: https://github.com/linux-audit/audit-kernel/issues/81
> >
> > Signed-off-by: Richard Guy Briggs <rgb at redhat.com>
> > ---
> > MAINTAINERS | 2 +-
> > include/linux/audit.h | 10 +++++-----
> > include/linux/audit_task.h | 31 +++++++++++++++++++++++++++++++
> > include/linux/sched.h | 6 ++----
> > init/init_task.c | 7 +++++--
> > kernel/auditsc.c | 6 +++---
> > 6 files changed, 47 insertions(+), 15 deletions(-)
> > create mode 100644 include/linux/audit_task.h
>
> I'm not going to merge this right now; there is still the question of
> static vs dynamic (as mentioned in 0/5) and with the main motivation
> being the audit container ID work, I think it would be good to wait
> for the next round of those patches before committing to something.
Agreed. I included it for completeness...
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index 0a1410d..8c7992d 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -2510,7 +2510,7 @@ L: linux-audit at redhat.com (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 f7973e4..6d599b6 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(void)
> > {
> > - return current->audit_context;
> > + return current->audit.ctx;
> > }
> > static inline bool audit_dummy_context(void)
> > {
> > @@ -250,7 +250,7 @@ static inline bool audit_dummy_context(void)
> > }
> > static inline void audit_free(struct task_struct *task)
> > {
> > - if (unlikely(task->audit_context))
> > + if (unlikely(task->audit.ctx))
> > __audit_free(task);
> > }
> > static inline void audit_syscall_entry(int major, unsigned long a0,
> > @@ -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 at redhat.com>
> > + *
> > + */
> > +
> > +#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 74f60ba..d33260d 100644
> > --- a/init/init_task.c
> > +++ b/init/init_task.c
> > @@ -119,8 +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 d441d68..4c1fd18 100644
> > --- a/kernel/auditsc.c
> > +++ b/kernel/auditsc.c
> > @@ -836,7 +836,7 @@ static inline struct audit_context *audit_take_context(struct task_struct *tsk,
> > int return_valid,
> > long return_code)
> > {
> > - struct audit_context *context = tsk->audit_context;
> > + struct audit_context *context = tsk->audit.ctx;
> >
> > if (!context)
> > return NULL;
> > @@ -2066,8 +2066,8 @@ 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
> >
>
>
>
> --
> paul moore
> www.paul-moore.com
- RGB
--
Richard Guy Briggs <rgb at redhat.com>
Sr. S/W Engineer, Kernel Security, Base Operating Systems
Remote, Ottawa, Red Hat Canada
IRC: rgb, SunRaycer
Voice: +1.647.777.2635, Internal: (81) 32635
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