fixing audit rule ordering mess, part 1

Problem: ordering between the rules on exit chain is currently lost;
all watch and inode rules are listed after everything else _and_
exit,never on one kind doesn't stop exit,always on another from
being matched.

Solution: assign priorities to rules, keep track of the current
highest-priority matching rule and its result (always/never).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 43 insertions, 36 deletions

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index c76a58215f54..19d2c2747c8d 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -165,14 +165,14 @@ struct audit_tree_refs {
 struct audit_context {
         int                 dummy;      /* must be the first element */
         int                 in_syscall; /* 1 if task is in a syscall */
-        enum audit_state    state;
+        enum audit_state    state, current_state;
         unsigned int        serial;     /* serial number for record */
         struct timespec     ctime;      /* time of syscall entry */
         int                 major;      /* syscall number */
         unsigned long       argv[4];    /* syscall arguments */
         int                 return_valid; /* return code is valid */
         long                return_code;/* syscall return code */
-        int                 auditable;  /* 1 if record should be written */
+        u64                 prio;
         int                 name_count;
         struct audit_names  names[AUDIT_NAMES];
         char *              filterkey;  /* key for rule that triggered record */
@@ -630,8 +630,16 @@ static int audit_filter_rules(struct task_struct *tsk,
                         return 0;
                 }
         }
-        if (rule->filterkey && ctx)
-                ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC);
+
+        if (ctx) {
+                if (rule->prio <= ctx->prio)
+                        return 0;
+                if (rule->filterkey) {
+                        kfree(ctx->filterkey);
+                        ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC);
+                }
+                ctx->prio = rule->prio;
+        }
         switch (rule->action) {
         case AUDIT_NEVER:    *state = AUDIT_DISABLED;       break;
         case AUDIT_ALWAYS:   *state = AUDIT_RECORD_CONTEXT; break;
@@ -685,6 +693,7 @@ static enum audit_state audit_filter_syscall(struct task_struct *tsk,
                             audit_filter_rules(tsk, &e->rule, ctx, NULL,
                                                &state)) {
                                 rcu_read_unlock();
+                                ctx->current_state = state;
                                 return state;
                         }
                 }
@@ -698,15 +707,14 @@ static enum audit_state audit_filter_syscall(struct task_struct *tsk,
  * buckets applicable to the inode numbers in audit_names[].
  * Regarding audit_state, same rules apply as for audit_filter_syscall().
  */
-enum audit_state audit_filter_inodes(struct task_struct *tsk,
-                                     struct audit_context *ctx)
+void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx)
 {
         int i;
         struct audit_entry *e;
         enum audit_state state;
 
         if (audit_pid && tsk->tgid == audit_pid)
-                return AUDIT_DISABLED;
+                return;
 
         rcu_read_lock();
         for (i = 0; i < ctx->name_count; i++) {
@@ -723,17 +731,20 @@ enum audit_state audit_filter_inodes(struct task_struct *tsk,
                         if ((e->rule.mask[word] & bit) == bit &&
                             audit_filter_rules(tsk, &e->rule, ctx, n, &state)) {
                                 rcu_read_unlock();
-                                return state;
+                                ctx->current_state = state;
+                                return;
                         }
                 }
         }
         rcu_read_unlock();
-        return AUDIT_BUILD_CONTEXT;
 }
 
-void audit_set_auditable(struct audit_context *ctx)
+static void audit_set_auditable(struct audit_context *ctx)
 {
-        ctx->auditable = 1;
+        if (!ctx->prio) {
+                ctx->prio = 1;
+                ctx->current_state = AUDIT_RECORD_CONTEXT;
+        }
 }
 
 static inline struct audit_context *audit_get_context(struct task_struct *tsk,
@@ -764,23 +775,11 @@ static inline struct audit_context *audit_get_context(struct task_struct *tsk,
         else
                 context->return_code  = return_code;
 
-        if (context->in_syscall && !context->dummy && !context->auditable) {
-                enum audit_state state;
-
-                state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]);
-                if (state == AUDIT_RECORD_CONTEXT) {
-                        context->auditable = 1;
-                        goto get_context;
-                }
-
-                state = audit_filter_inodes(tsk, context);
-                if (state == AUDIT_RECORD_CONTEXT)
-                        context->auditable = 1;
-
+        if (context->in_syscall && !context->dummy) {
+                audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]);
+                audit_filter_inodes(tsk, context);
         }
 
-get_context:
-
         tsk->audit_context = NULL;
         return context;
 }
@@ -790,8 +789,7 @@ static inline void audit_free_names(struct audit_context *context)
         int i;
 
 #if AUDIT_DEBUG == 2
-        if (context->auditable
-            ||context->put_count + context->ino_count != context->name_count) {
+        if (context->put_count + context->ino_count != context->name_count) {
                 printk(KERN_ERR "%s:%d(:%d): major=%d in_syscall=%d"
                        " name_count=%d put_count=%d"
                        " ino_count=%d [NOT freeing]\n",
@@ -842,6 +840,7 @@ static inline void audit_zero_context(struct audit_context *context,
 {
         memset(context, 0, sizeof(*context));
         context->state      = state;
+        context->prio = state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0;
 }
 
 static inline struct audit_context *audit_alloc_context(enum audit_state state)
@@ -1543,7 +1542,7 @@ void audit_free(struct task_struct *tsk)
          * We use GFP_ATOMIC here because we might be doing this
          * in the context of the idle thread */
         /* that can happen only if we are called from do_exit() */
-        if (context->in_syscall && context->auditable)
+        if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT)
                 audit_log_exit(context, tsk);
 
         audit_free_context(context);
@@ -1627,15 +1626,17 @@ void audit_syscall_entry(int arch, int major,
 
         state = context->state;
         context->dummy = !audit_n_rules;
-        if (!context->dummy && (state == AUDIT_SETUP_CONTEXT || state == AUDIT_BUILD_CONTEXT))
+        if (!context->dummy && state == AUDIT_BUILD_CONTEXT) {
+                context->prio = 0;
                 state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]);
+        }
         if (likely(state == AUDIT_DISABLED))
                 return;
 
         context->serial     = 0;
         context->ctime      = CURRENT_TIME;
         context->in_syscall = 1;
-        context->auditable  = !!(state == AUDIT_RECORD_CONTEXT);
+        context->current_state  = state;
         context->ppid       = 0;
 }
 
@@ -1643,17 +1644,20 @@ void audit_finish_fork(struct task_struct *child)
 {
         struct audit_context *ctx = current->audit_context;
         struct audit_context *p = child->audit_context;
-        if (!p || !ctx || !ctx->auditable)
+        if (!p || !ctx)
+                return;
+        if (!ctx->in_syscall || ctx->current_state != AUDIT_RECORD_CONTEXT)
                 return;
         p->arch = ctx->arch;
         p->major = ctx->major;
         memcpy(p->argv, ctx->argv, sizeof(ctx->argv));
         p->ctime = ctx->ctime;
         p->dummy = ctx->dummy;
-        p->auditable = ctx->auditable;
         p->in_syscall = ctx->in_syscall;
         p->filterkey = kstrdup(ctx->filterkey, GFP_KERNEL);
         p->ppid = current->pid;
+        p->prio = ctx->prio;
+        p->current_state = ctx->current_state;
 }
 
 /**
@@ -1677,11 +1681,11 @@ void audit_syscall_exit(int valid, long return_code)
         if (likely(!context))
                 return;
 
-        if (context->in_syscall && context->auditable)
+        if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT)
                 audit_log_exit(context, tsk);
 
         context->in_syscall = 0;
-        context->auditable  = 0;
+        context->prio = context->state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0;
 
         if (context->previous) {
                 struct audit_context *new_context = context->previous;
@@ -2091,7 +2095,10 @@ int auditsc_get_stamp(struct audit_context *ctx,
         t->tv_sec  = ctx->ctime.tv_sec;
         t->tv_nsec = ctx->ctime.tv_nsec;
         *serial    = ctx->serial;
-        ctx->auditable = 1;
+        if (!ctx->prio) {
+                ctx->prio = 1;
+                ctx->current_state = AUDIT_RECORD_CONTEXT;
+        }
         return 1;
 }