Merge branch 'linux-4.6' of git://github.com/skeggsb/linux into drm-fixes

[cascardo/linux.git] / drivers / android / binder.c

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 7d00b7a..16288e7 100644 (file)
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -1321,6 +1321,7 @@ static void binder_transaction(struct binder_proc *proc,
        struct binder_transaction *t;
        struct binder_work *tcomplete;
        binder_size_t *offp, *off_end;
+       binder_size_t off_min;
        struct binder_proc *target_proc;
        struct binder_thread *target_thread = NULL;
        struct binder_node *target_node = NULL;
@@ -1522,18 +1523,24 @@ static void binder_transaction(struct binder_proc *proc,
                goto err_bad_offset;
        }
        off_end = (void *)offp + tr->offsets_size;
+       off_min = 0;
        for (; offp < off_end; offp++) {
                struct flat_binder_object *fp;
 
                if (*offp > t->buffer->data_size - sizeof(*fp) ||
+                   *offp < off_min ||
                    t->buffer->data_size < sizeof(*fp) ||
                    !IS_ALIGNED(*offp, sizeof(u32))) {
-                       binder_user_error("%d:%d got transaction with invalid offset, %lld\n",
-                                         proc->pid, thread->pid, (u64)*offp);
+                       binder_user_error("%d:%d got transaction with invalid offset, %lld (min %lld, max %lld)\n",
+                                         proc->pid, thread->pid, (u64)*offp,
+                                         (u64)off_min,
+                                         (u64)(t->buffer->data_size -
+                                         sizeof(*fp)));
                        return_error = BR_FAILED_REPLY;
                        goto err_bad_offset;
                }
                fp = (struct flat_binder_object *)(t->buffer->data + *offp);
+               off_min = *offp + sizeof(struct flat_binder_object);
                switch (fp->type) {
                case BINDER_TYPE_BINDER:
                case BINDER_TYPE_WEAK_BINDER: {
@@ -2737,6 +2744,10 @@ static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
        /*pr_info("binder_ioctl: %d:%d %x %lx\n",
                        proc->pid, current->pid, cmd, arg);*/
 
+       if (unlikely(current->mm != proc->vma_vm_mm)) {
+               pr_err("current mm mismatch proc mm\n");
+               return -EINVAL;
+       }
        trace_binder_ioctl(cmd, arg);
 
        ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
@@ -2951,6 +2962,7 @@ static int binder_open(struct inode *nodp, struct file *filp)
                return -ENOMEM;
        get_task_struct(current);
        proc->tsk = current;
+       proc->vma_vm_mm = current->mm;
        INIT_LIST_HEAD(&proc->todo);
        init_waitqueue_head(&proc->wait);
        proc->default_priority = task_nice(current);
@@ -3593,13 +3605,24 @@ static int binder_transactions_show(struct seq_file *m, void *unused)
 
 static int binder_proc_show(struct seq_file *m, void *unused)
 {
+       struct binder_proc *itr;
        struct binder_proc *proc = m->private;
        int do_lock = !binder_debug_no_lock;
+       bool valid_proc = false;
 
        if (do_lock)
                binder_lock(__func__);
-       seq_puts(m, "binder proc state:\n");
-       print_binder_proc(m, proc, 1);
+
+       hlist_for_each_entry(itr, &binder_procs, proc_node) {
+               if (itr == proc) {
+                       valid_proc = true;
+                       break;
+               }
+       }
+       if (valid_proc) {
+               seq_puts(m, "binder proc state:\n");
+               print_binder_proc(m, proc, 1);
+       }
        if (do_lock)
                binder_unlock(__func__);
        return 0;