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audit: use a consistent audit helper to log lsm information 

We have a number of places we were reimplementing the same code to write
out lsm labels.  Just do it one darn place.

Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Eric Paris 2013-04-19 15:00:33 -04:00
parent 152f497b9b
commit b122c3767c
4 changed files with 15 additions and 50 deletions
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8
include/linux/audit.h
View File

@ -188,7 +188,7 @@ static inline int audit_get_sessionid(struct task_struct *tsk)
return tsk->sessionid;
}
extern void audit_log_task_context(struct audit_buffer *ab);
extern int audit_log_task_context(struct audit_buffer *ab);
extern void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk);
extern void __audit_ipc_obj(struct kern_ipc_perm *ipcp);
extern void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode);
@ -344,8 +344,10 @@ static inline int audit_get_sessionid(struct task_struct *tsk)
{
return -1;
}
static inline void audit_log_task_context(struct audit_buffer *ab)
{ }
static int void audit_log_task_context(struct audit_buffer *ab)
{
return 0;
}
static inline void audit_log_task_info(struct audit_buffer *ab,
struct task_struct *tsk)
{ }

34
kernel/audit.c
View File

@ -271,29 +271,15 @@ static int audit_log_config_change(char *function_name, int new, int old,
int rc = 0;
u32 sessionid = audit_get_sessionid(current);
uid_t auid = from_kuid(&init_user_ns, audit_get_loginuid(current));
u32 sid;
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
if (unlikely(!ab))
return rc;
audit_log_format(ab, "%s=%d old=%d auid=%u ses=%u", function_name, new,
old, auid, sessionid);
security_task_getsecid(current, &sid);
if (sid) {
char *ctx = NULL;
u32 len;
rc = security_secid_to_secctx(sid, &ctx, &len);
if (rc) {
audit_log_format(ab, " sid=%u", sid);
allow_changes = 0; /* Something weird, deny request */
} else {
audit_log_format(ab, " subj=%s", ctx);
security_release_secctx(ctx, len);
}
}
rc = audit_log_task_context(ab);
if (rc)
allow_changes = 0; /* Something weird, deny request */
audit_log_format(ab, " res=%d", allow_changes);
audit_log_end(ab);
return rc;
@ -625,12 +611,9 @@ static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
static int audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type)
{
int rc = 0;
char *ctx = NULL;
u32 len;
u32 sessionid = audit_get_sessionid(current);
uid_t uid = from_kuid(&init_user_ns, current_uid());
uid_t auid = from_kuid(&init_user_ns, audit_get_loginuid(current));
u32 sid;
if (!audit_enabled) {
*ab = NULL;
@ -642,16 +625,7 @@ static int audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type)
return rc;
audit_log_format(*ab, "pid=%d uid=%u auid=%u ses=%u",
task_tgid_vnr(current), uid, auid, sessionid);
security_task_getsecid(current, &sid);
if (sid) {
rc = security_secid_to_secctx(sid, &ctx, &len);
if (rc)
audit_log_format(*ab, " ssid=%u", sid);
else {
audit_log_format(*ab, " subj=%s", ctx);
security_release_secctx(ctx, len);
}
}
audit_log_task_context(*ab);
return rc;
}

13
kernel/auditfilter.c
View File

@ -985,7 +985,6 @@ static void audit_log_rule_change(char *action, struct audit_krule *rule, int re
struct audit_buffer *ab;
uid_t loginuid = from_kuid(&init_user_ns, audit_get_loginuid(current));
u32 sessionid = audit_get_sessionid(current);
u32 sid;
if (!audit_enabled)
return;
@ -994,17 +993,7 @@ static void audit_log_rule_change(char *action, struct audit_krule *rule, int re
if (!ab)
return;
audit_log_format(ab, "auid=%u ses=%u" ,loginuid, sessionid);
security_task_getsecid(current, &sid);
if (sid) {
char *ctx = NULL;
u32 len;
if (security_secid_to_secctx(sid, &ctx, &len))
audit_log_format(ab, " ssid=%u", sid);
else {
audit_log_format(ab, " subj=%s", ctx);
security_release_secctx(ctx, len);
}
}
audit_log_task_context(ab);
audit_log_format(ab, " op=");
audit_log_string(ab, action);
audit_log_key(ab, rule->filterkey);

10
kernel/auditsc.c
View File

@ -1109,7 +1109,7 @@ static inline void audit_free_context(struct audit_context *context)
kfree(context);
}
void audit_log_task_context(struct audit_buffer *ab)
int audit_log_task_context(struct audit_buffer *ab)
{
char *ctx = NULL;
unsigned len;
@ -1118,22 +1118,22 @@ void audit_log_task_context(struct audit_buffer *ab)
security_task_getsecid(current, &sid);
if (!sid)
return;
return 0;
error = security_secid_to_secctx(sid, &ctx, &len);
if (error) {
if (error != -EINVAL)
goto error_path;
return;
return 0;
}
audit_log_format(ab, " subj=%s", ctx);
security_release_secctx(ctx, len);
return;
return 0;
error_path:
audit_panic("error in audit_log_task_context");
return;
return error;
}
EXPORT_SYMBOL(audit_log_task_context);