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. Use kmem_cache to manage this pool of memory. Un-inline audit_free() to be able to always recover that memory. Please see the upstream github issue https://github.com/linux-audit/audit-kernel/issues/81 Signed-off-by: Richard Guy Briggs <r...@redhat.com> Acked-by: Neil Horman <nhor...@tuxdriver.com> Reviewed-by: Ondrej Mosnacek <omosn...@redhat.com> --- include/linux/audit.h | 49 +++++++++++++++++++++++------------ include/linux/sched.h | 7 +---- init/init_task.c | 3 +-- init/main.c | 2 ++ kernel/audit.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++++-- kernel/audit.h | 5 ++++ kernel/auditsc.c | 26 ++++++++++--------- kernel/fork.c | 1 - 8 files changed, 124 insertions(+), 40 deletions(-) diff --git a/include/linux/audit.h b/include/linux/audit.h index 3fcd9ee49734..c2150415f9df 100644 --- a/include/linux/audit.h +++ b/include/linux/audit.h @@ -100,6 +100,16 @@ enum audit_nfcfgop { AUDIT_XT_OP_UNREGISTER, }; +struct audit_task_info { + kuid_t loginuid; + unsigned int sessionid; +#ifdef CONFIG_AUDITSYSCALL + struct audit_context *ctx; +#endif +}; + +extern struct audit_task_info init_struct_audit; + extern int is_audit_feature_set(int which); extern int __init audit_register_class(int class, unsigned *list); @@ -136,6 +146,9 @@ enum audit_nfcfgop { #ifdef CONFIG_AUDIT /* These are defined in audit.c */ /* Public API */ +extern int audit_alloc(struct task_struct *task); +extern void audit_free(struct task_struct *task); +extern void __init audit_task_init(void); extern __printf(4, 5) void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type, const char *fmt, ...); @@ -179,12 +192,16 @@ extern void audit_log_path_denied(int type, static inline kuid_t audit_get_loginuid(struct task_struct *tsk) { - return tsk->loginuid; + if (!tsk->audit) + return INVALID_UID; + return tsk->audit->loginuid; } static inline unsigned int audit_get_sessionid(struct task_struct *tsk) { - return tsk->sessionid; + if (!tsk->audit) + return AUDIT_SID_UNSET; + return tsk->audit->sessionid; } extern u32 audit_enabled; @@ -192,6 +209,14 @@ static inline unsigned int audit_get_sessionid(struct task_struct *tsk) extern int audit_signal_info(int sig, struct task_struct *t); #else /* CONFIG_AUDIT */ +static inline int audit_alloc(struct task_struct *task) +{ + return 0; +} +static inline void audit_free(struct task_struct *task) +{ } +static inline void __init audit_task_init(void) +{ } static inline __printf(4, 5) void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type, const char *fmt, ...) @@ -267,8 +292,6 @@ static inline int audit_signal_info(int sig, struct task_struct *t) /* These are defined in auditsc.c */ /* Public API */ -extern int audit_alloc(struct task_struct *task); -extern void __audit_free(struct task_struct *task); extern void __audit_syscall_entry(int major, unsigned long a0, unsigned long a1, unsigned long a2, unsigned long a3); extern void __audit_syscall_exit(int ret_success, long ret_value); @@ -288,12 +311,14 @@ extern void audit_seccomp_actions_logged(const char *names, 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; + if (!current->audit) + return NULL; + return current->audit->ctx; } static inline bool audit_dummy_context(void) @@ -301,11 +326,7 @@ static inline bool audit_dummy_context(void) void *p = audit_context(); return !p || *(int *)p; } -static inline void audit_free(struct task_struct *task) -{ - if (unlikely(task->audit_context)) - __audit_free(task); -} + static inline void audit_syscall_entry(int major, unsigned long a0, unsigned long a1, unsigned long a2, unsigned long a3) @@ -533,12 +554,6 @@ static inline void audit_log_nfcfg(const char *name, u8 af, extern int audit_n_rules; extern int audit_signals; #else /* CONFIG_AUDITSYSCALL */ -static inline int audit_alloc(struct task_struct *task) -{ - return 0; -} -static inline void audit_free(struct task_struct *task) -{ } static inline void audit_syscall_entry(int major, unsigned long a0, unsigned long a1, unsigned long a2, unsigned long a3) diff --git a/include/linux/sched.h b/include/linux/sched.h index b62e6aaf28f0..2213ac670386 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -34,7 +34,6 @@ #include <linux/kcsan.h> /* task_struct member predeclarations (sorted alphabetically): */ -struct audit_context; struct backing_dev_info; struct bio_list; struct blk_plug; @@ -946,11 +945,7 @@ struct task_struct { struct callback_head *task_works; #ifdef CONFIG_AUDIT -#ifdef CONFIG_AUDITSYSCALL - struct audit_context *audit_context; -#endif - 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 15089d15010a..92d34c4b7702 100644 --- a/init/init_task.c +++ b/init/init_task.c @@ -130,8 +130,7 @@ 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_AUDIT - .loginuid = INVALID_UID, - .sessionid = AUDIT_SID_UNSET, + .audit = &init_struct_audit, #endif #ifdef CONFIG_PERF_EVENTS .perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex), diff --git a/init/main.c b/init/main.c index 0ead83e86b5a..349470ad7458 100644 --- a/init/main.c +++ b/init/main.c @@ -96,6 +96,7 @@ #include <linux/jump_label.h> #include <linux/mem_encrypt.h> #include <linux/kcsan.h> +#include <linux/audit.h> #include <asm/io.h> #include <asm/bugs.h> @@ -1028,6 +1029,7 @@ asmlinkage __visible void __init start_kernel(void) nsfs_init(); cpuset_init(); cgroup_init(); + audit_task_init(); taskstats_init_early(); delayacct_init(); diff --git a/kernel/audit.c b/kernel/audit.c index 8c201f414226..5d8147a29291 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -203,6 +203,73 @@ struct audit_reply { struct sk_buff *skb; }; +static struct kmem_cache *audit_task_cache; + +void __init audit_task_init(void) +{ + audit_task_cache = kmem_cache_create("audit_task", + sizeof(struct audit_task_info), + 0, SLAB_PANIC, NULL); +} + +/** + * audit_alloc - allocate an audit info block for a task + * @tsk: task + * + * Call audit_alloc_syscall to filter on the task information and + * allocate a per-task audit context if necessary. This is called from + * copy_process, so no lock is needed. + */ +int audit_alloc(struct task_struct *tsk) +{ + int ret = 0; + struct audit_task_info *info; + + info = kmem_cache_alloc(audit_task_cache, GFP_KERNEL); + if (!info) { + ret = -ENOMEM; + goto out; + } + info->loginuid = audit_get_loginuid(current); + info->sessionid = audit_get_sessionid(current); + tsk->audit = info; + + ret = audit_alloc_syscall(tsk); + if (ret) { + tsk->audit = NULL; + kmem_cache_free(audit_task_cache, info); + } +out: + return ret; +} + +struct audit_task_info init_struct_audit = { + .loginuid = INVALID_UID, + .sessionid = AUDIT_SID_UNSET, +#ifdef CONFIG_AUDITSYSCALL + .ctx = NULL, +#endif +}; + +/** + * audit_free - free per-task audit info + * @tsk: task whose audit info block to free + * + * Called from copy_process and do_exit + */ +void audit_free(struct task_struct *tsk) +{ + struct audit_task_info *info = tsk->audit; + + audit_free_syscall(tsk); + /* Freeing the audit_task_info struct must be performed after + * audit_log_exit() due to need for loginuid and sessionid. + */ + info = tsk->audit; + tsk->audit = NULL; + kmem_cache_free(audit_task_cache, info); +} + /** * auditd_test_task - Check to see if a given task is an audit daemon * @task: the task to check @@ -2309,8 +2376,8 @@ int audit_set_loginuid(kuid_t loginuid) sessionid = (unsigned int)atomic_inc_return(&session_id); } - current->sessionid = sessionid; - current->loginuid = loginuid; + current->audit->sessionid = sessionid; + current->audit->loginuid = loginuid; out: audit_log_set_loginuid(oldloginuid, loginuid, oldsessionid, sessionid, rc); return rc; diff --git a/kernel/audit.h b/kernel/audit.h index f0233dc40b17..9bee09757068 100644 --- a/kernel/audit.h +++ b/kernel/audit.h @@ -251,6 +251,8 @@ extern void audit_log_d_path_exe(struct audit_buffer *ab, extern unsigned int audit_serial(void); extern int auditsc_get_stamp(struct audit_context *ctx, struct timespec64 *t, unsigned int *serial); +extern int audit_alloc_syscall(struct task_struct *tsk); +extern void audit_free_syscall(struct task_struct *tsk); extern void audit_put_watch(struct audit_watch *watch); extern void audit_get_watch(struct audit_watch *watch); @@ -299,6 +301,9 @@ static inline void audit_clear_dummy(struct audit_context *ctx) #else /* CONFIG_AUDITSYSCALL */ #define auditsc_get_stamp(c, t, s) 0 +#define audit_alloc_syscall(t) 0 +#define audit_free_syscall(t) {} + #define audit_put_watch(w) {} #define audit_get_watch(w) {} #define audit_to_watch(k, p, l, o) (-EINVAL) diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 468a23390457..f00c1da587ea 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -914,23 +914,25 @@ static inline struct audit_context *audit_alloc_context(enum audit_state state) return context; } -/** - * audit_alloc - allocate an audit context block for a task +/* + * audit_alloc_syscall - allocate an audit context block for a task * @tsk: task * * Filter on the task information and allocate a per-task audit context * if necessary. Doing so turns on system call auditing for the - * specified task. This is called from copy_process, so no lock is - * needed. + * specified task. This is called from copy_process via audit_alloc, so + * no lock is needed. */ -int audit_alloc(struct task_struct *tsk) +int audit_alloc_syscall(struct task_struct *tsk) { struct audit_context *context; enum audit_state state; char *key = NULL; - if (likely(!audit_ever_enabled)) + if (likely(!audit_ever_enabled)) { + audit_set_context(tsk, NULL); return 0; /* Return if not auditing. */ + } state = audit_filter_task(tsk, &key); if (state == AUDIT_DISABLED) { @@ -940,7 +942,7 @@ int audit_alloc(struct task_struct *tsk) if (!(context = audit_alloc_context(state))) { kfree(key); - audit_log_lost("out of memory in audit_alloc"); + audit_log_lost("out of memory in audit_alloc_syscall"); return -ENOMEM; } context->filterkey = key; @@ -1582,14 +1584,15 @@ static void audit_log_exit(void) } /** - * __audit_free - free a per-task audit context + * audit_free_syscall - free per-task audit context info * @tsk: task whose audit context block to free * - * Called from copy_process and do_exit + * Called from audit_free */ -void __audit_free(struct task_struct *tsk) +void audit_free_syscall(struct task_struct *tsk) { - struct audit_context *context = tsk->audit_context; + struct audit_task_info *info = tsk->audit; + struct audit_context *context = info->ctx; if (!context) return; @@ -1612,7 +1615,6 @@ void __audit_free(struct task_struct *tsk) if (context->current_state == AUDIT_RECORD_CONTEXT) audit_log_exit(); } - audit_set_context(tsk, NULL); audit_free_context(context); } diff --git a/kernel/fork.c b/kernel/fork.c index 142b23645d82..bacbff0e8a75 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -2019,7 +2019,6 @@ static __latent_entropy struct task_struct *copy_process( posix_cputimers_init(&p->posix_cputimers); p->io_context = NULL; - audit_set_context(p, NULL); cgroup_fork(p); #ifdef CONFIG_NUMA p->mempolicy = mpol_dup(p->mempolicy); -- 1.8.3.1
