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Subject[PATCH RFC 20/48] Audit: introduce new audit logging interface for user namespace
Date
This interface audit_log_start_ns and audit_log_end_ns
will be used for logging audit logs in user namespace.

Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
---
include/linux/audit.h | 25 ++++++++++++--
kernel/audit.c | 95 ++++++++++++++++++++++++++++++---------------------
2 files changed, 78 insertions(+), 42 deletions(-)

diff --git a/include/linux/audit.h b/include/linux/audit.h
index 33e6584..f16db07 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -398,10 +398,18 @@ extern __printf(4, 5)
void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
const char *fmt, ...);

-extern struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type);
+extern struct audit_buffer *
+audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type);
+
+extern struct audit_buffer *
+audit_log_start_ns(struct user_namespace *ns, struct audit_context *ctx,
+ gfp_t gfp_mask, int type);
+
extern __printf(2, 3)
void audit_log_format(struct audit_buffer *ab, const char *fmt, ...);
extern void audit_log_end(struct audit_buffer *ab);
+extern void audit_log_end_ns(struct user_namespace *ns,
+ struct audit_buffer *ab);
extern int audit_string_contains_control(const char *string,
size_t len);
extern void audit_log_n_hex(struct audit_buffer *ab,
@@ -448,8 +456,16 @@ static inline __printf(4, 5)
void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
const char *fmt, ...)
{ }
-static inline struct audit_buffer *audit_log_start(struct audit_context *ctx,
- gfp_t gfp_mask, int type)
+static inline
+struct audit_buffer *audit_log_start(struct audit_context *ctx,
+ gfp_t gfp_mask, int type)
+{
+ return NULL;
+}
+static inline
+struct audit_buffer *audit_log_start_ns(struct user_namespace *ns,
+ struct audit_context *ctx,
+ gfp_t gfp_mask, int type)
{
return NULL;
}
@@ -458,6 +474,9 @@ void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
{ }
static inline void audit_log_end(struct audit_buffer *ab)
{ }
+static inline void audit_log_end_ns(struct user_namespace *ns,
+ struct audit_buffer *ab)
+{ }
static inline void audit_log_n_hex(struct audit_buffer *ab,
const unsigned char *buf, size_t len)
{ }
diff --git a/kernel/audit.c b/kernel/audit.c
index 5ac9acd..594e4e1 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1139,47 +1139,35 @@ static inline void audit_get_stamp(struct audit_context *ctx,
/*
* Wait for auditd to drain the queue a little
*/
-static void wait_for_auditd(unsigned long sleep_time)
+static void wait_for_auditd(struct user_namespace *ns,
+ unsigned long sleep_time)
{
- const struct sk_buff_head *queue = &init_user_ns.audit.queue;
+ const struct sk_buff_head *queue = &ns->audit.queue;
DECLARE_WAITQUEUE(wait, current);
set_current_state(TASK_INTERRUPTIBLE);
- add_wait_queue(&init_user_ns.audit.backlog_wait, &wait);
+ add_wait_queue(&ns->audit.backlog_wait, &wait);

if (audit_backlog_limit &&
skb_queue_len(queue) > audit_backlog_limit)
schedule_timeout(sleep_time);

__set_current_state(TASK_RUNNING);
- remove_wait_queue(&init_user_ns.audit.backlog_wait, &wait);
+ remove_wait_queue(&ns->audit.backlog_wait, &wait);
}

-/**
- * audit_log_start - obtain an audit buffer
- * @ctx: audit_context (may be NULL)
- * @gfp_mask: type of allocation
- * @type: audit message type
- *
- * Returns audit_buffer pointer on success or NULL on error.
- *
- * Obtain an audit buffer. This routine does locking to obtain the
- * audit buffer, but then no locking is required for calls to
- * audit_log_*format. If the task (ctx) is a task that is currently in a
- * syscall, then the syscall is marked as auditable and an audit record
- * will be written at syscall exit. If there is no associated task, then
- * task context (ctx) should be NULL.
- */
-struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
- int type)
+struct audit_buffer *audit_log_start_ns(struct user_namespace *ns,
+ struct audit_context *ctx,
+ gfp_t gfp_mask,
+ int type)
{
struct audit_buffer *ab = NULL;
struct timespec t;
unsigned int uninitialized_var(serial);
int reserve;
unsigned long timeout_start = jiffies;
- struct sk_buff_head *queue = &init_user_ns.audit.queue;
+ struct sk_buff_head *queue = &ns->audit.queue;

- if (init_user_ns.audit.initialized != AUDIT_INITIALIZED)
+ if (ns->audit.initialized != AUDIT_INITIALIZED)
return NULL;

if (unlikely(audit_filter_type(type)))
@@ -1199,7 +1187,7 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
sleep_time = timeout_start + audit_backlog_wait_time -
jiffies;
if ((long)sleep_time > 0)
- wait_for_auditd(sleep_time);
+ wait_for_auditd(ns, sleep_time);
continue;
}
if (audit_rate_check() && printk_ratelimit())
@@ -1210,7 +1198,7 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
audit_backlog_limit);
audit_log_lost("backlog limit exceeded");
audit_backlog_wait_time = audit_backlog_wait_overflow;
- wake_up(&init_user_ns.audit.backlog_wait);
+ wake_up(&ns->audit.backlog_wait);
return NULL;
}

@@ -1227,6 +1215,28 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
return ab;
}

+
+/**
+ * audit_log_start - obtain an audit buffer
+ * @ctx: audit_context (may be NULL)
+ * @gfp_mask: type of allocation
+ * @type: audit message type
+ *
+ * Returns audit_buffer pointer on success or NULL on error.
+ *
+ * Obtain an audit buffer. This routine does locking to obtain the
+ * audit buffer, but then no locking is required for calls to
+ * audit_log_*format. If the task (ctx) is a task that is currently in a
+ * syscall, then the syscall is marked as auditable and an audit record
+ * will be written at syscall exit. If there is no associated task, then
+ * task context (ctx) should be NULL.
+ */
+struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
+ int type)
+{
+ return audit_log_start_ns(&init_user_ns, ctx, gfp_mask, type);
+}
+
/**
* audit_expand - expand skb in the audit buffer
* @ab: audit_buffer
@@ -1496,16 +1506,7 @@ void audit_log_link_denied(const char *operation, struct path *link)
audit_log_end(ab);
}

-/**
- * audit_log_end - end one audit record
- * @ab: the audit_buffer
- *
- * The netlink_* functions cannot be called inside an irq context, so
- * the audit buffer is placed on a queue and a tasklet is scheduled to
- * remove them from the queue outside the irq context. May be called in
- * any context.
- */
-void audit_log_end(struct audit_buffer *ab)
+void audit_log_end_ns(struct user_namespace *ns, struct audit_buffer *ab)
{
if (!ab)
return;
@@ -1515,12 +1516,12 @@ void audit_log_end(struct audit_buffer *ab)
struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
nlh->nlmsg_len = ab->skb->len - NLMSG_HDRLEN;

- if (init_user_ns.audit.pid) {
- skb_queue_tail(&init_user_ns.audit.queue,
+ if (ns->audit.pid) {
+ skb_queue_tail(&ns->audit.queue,
ab->skb);
- wake_up_interruptible(&init_user_ns.audit.kauditd_wait);
+ wake_up_interruptible(&ns->audit.kauditd_wait);
} else {
- audit_printk_skb(&init_user_ns, ab->skb);
+ audit_printk_skb(ns, ab->skb);
}
ab->skb = NULL;
}
@@ -1528,6 +1529,20 @@ void audit_log_end(struct audit_buffer *ab)
}

/**
+ * audit_log_end - end one audit record
+ * @ab: the audit_buffer
+ *
+ * The netlink_* functions cannot be called inside an irq context, so
+ * the audit buffer is placed on a queue and a tasklet is scheduled to
+ * remove them from the queue outside the irq context. May be called in
+ * any context.
+ */
+void audit_log_end(struct audit_buffer *ab)
+{
+ audit_log_end_ns(&init_user_ns, ab);
+}
+
+/**
* audit_log - Log an audit record
* @ctx: audit context
* @gfp_mask: type of allocation
@@ -1614,7 +1629,9 @@ void audit_free_user_ns(struct user_namespace *ns)
}

EXPORT_SYMBOL(audit_log_start);
+EXPORT_SYMBOL(audit_log_start_ns);
EXPORT_SYMBOL(audit_log_end);
+EXPORT_SYMBOL(audit_log_end_ns);
EXPORT_SYMBOL(audit_log_format);
EXPORT_SYMBOL(audit_log);
EXPORT_SYMBOL(audit_set_user_ns);
--
1.8.1.4


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