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authorColin Cross <ccross@android.com>2017-08-31 10:04:24 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-09-01 09:21:12 +0200
commitabcc61537e3566cae7f1fd225f2dcb82b3595fe3 (patch)
tree42bb776af8185321b11aadbc201838347c16d143 /drivers/android
parent408c68b17aea2f23236cdb49b6c060e0ded846ed (diff)
ANDROID: binder: Add BINDER_GET_NODE_DEBUG_INFO ioctl
The BINDER_GET_NODE_DEBUG_INFO ioctl will return debug info on a node. Each successive call reusing the previous return value will return the next node. The data will be used by libmemunreachable to mark the pointers with kernel references as reachable. Signed-off-by: Colin Cross <ccross@android.com> Signed-off-by: Martijn Coenen <maco@android.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/android')
-rw-r--r--drivers/android/binder.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 8f2031c52ea4..eb8bd8d7c4c9 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -4389,6 +4389,31 @@ out:
return ret;
}
+static int binder_ioctl_get_node_debug_info(struct binder_proc *proc,
+ struct binder_node_debug_info *info)
+{
+ struct rb_node *n;
+ binder_uintptr_t ptr = info->ptr;
+
+ memset(info, 0, sizeof(*info));
+
+ binder_inner_proc_lock(proc);
+ for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
+ struct binder_node *node = rb_entry(n, struct binder_node,
+ rb_node);
+ if (node->ptr > ptr) {
+ info->ptr = node->ptr;
+ info->cookie = node->cookie;
+ info->has_strong_ref = node->has_strong_ref;
+ info->has_weak_ref = node->has_weak_ref;
+ break;
+ }
+ }
+ binder_inner_proc_unlock(proc);
+
+ return 0;
+}
+
static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
int ret;
@@ -4458,6 +4483,24 @@ static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
}
break;
}
+ case BINDER_GET_NODE_DEBUG_INFO: {
+ struct binder_node_debug_info info;
+
+ if (copy_from_user(&info, ubuf, sizeof(info))) {
+ ret = -EFAULT;
+ goto err;
+ }
+
+ ret = binder_ioctl_get_node_debug_info(proc, &info);
+ if (ret < 0)
+ goto err;
+
+ if (copy_to_user(ubuf, &info, sizeof(info))) {
+ ret = -EFAULT;
+ goto err;
+ }
+ break;
+ }
default:
ret = -EINVAL;
goto err;

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