xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ANDROID: binder: Add BINDER_GET_NODE_DEBUG_INFO ioctl

Browse Source 
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>
This commit is contained in:
Colin Cross
2017-08-31 10:04:24 +02:00
committed by Greg Kroah-Hartman
parent 408c68b17a
commit abcc61537e
2 changed files with 57 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

43
drivers/android/binder.c
View File

@@ -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;