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Add BINDER_GET_NODE_DEBUG_INFO ioctl

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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.

Bug: 28275695
Change-Id: Idbbafa648a33822dc023862cd92b51a595cf7c1c
Signed-off-by: Colin Cross <ccross@android.com>
Signed-off-by: Martijn Coenen <maco@android.com>
This commit is contained in:
Colin Cross
2017-06-20 13:54:44 -07:00
committed by Martijn Coenen
parent a1f38bfe50
commit b37ba51aa9
2 changed files with 56 additions and 0 deletions
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42
drivers/android/binder.c
View File

@@ -3938,6 +3938,30 @@ static void zombie_cleanup_check(struct binder_proc *proc)
binder_defer_work(proc, BINDER_ZOMBIE_CLEANUP);
}
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_proc_lock(proc, __LINE__);
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_proc_unlock(proc, __LINE__);
return 0;
}
static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
int ret;
@@ -4010,6 +4034,24 @@ 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;

14
include/uapi/linux/android/binder.h
View File

@@ -222,6 +222,19 @@ struct binder_version {
#define BINDER_CURRENT_PROTOCOL_VERSION 8
#endif
/*
* Use with BINDER_GET_NODE_DEBUG_INFO, driver reads ptr, writes to all fields.
* Set ptr to NULL for the first call to get the info for the first node, and
* then repeat the call passing the previously returned value to get the next
* nodes. ptr will be 0 when there are no more nodes.
*/
struct binder_node_debug_info {
binder_uintptr_t ptr;
binder_uintptr_t cookie;
__u32 has_strong_ref;
__u32 has_weak_ref;
};
#define BINDER_WRITE_READ _IOWR('b', 1, struct binder_write_read)
#define BINDER_SET_IDLE_TIMEOUT _IOW('b', 3, __s64)
#define BINDER_SET_MAX_THREADS _IOW('b', 5, __u32)
@@ -230,6 +243,7 @@ struct binder_version {
#define BINDER_THREAD_EXIT _IOW('b', 8, __s32)
#define BINDER_VERSION _IOWR('b', 9, struct binder_version)
#define BINDER_SET_INHERIT_FIFO_PRIO _IO('b', 10)
#define BINDER_GET_NODE_DEBUG_INFO _IOWR('b', 11, struct binder_node_debug_info)
/*
* NOTE: Two special error codes you should check for when calling