1 /*
2 * Copyright 2023, The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "tombstoned/tombstoned.h"
18
19 #include <unistd.h>
20
21 #include <android-base/logging.h>
22 #include <android-base/properties.h>
23 #include <android-base/unique_fd.h>
24 #include <cutils/sockets.h>
25 #include <linux/vm_sockets.h>
26 #include "util.h"
27
28 using android::base::unique_fd;
29
30 /*
31 Port number that VirtualMachineService listens on connections from the guest VMs.
32 Kep in sync with IVirtualMachineService.aidl
33 */
34 const unsigned int VM_TOMBSTONES_SERVICE_PORT = 2000;
35
is_microdroid()36 static bool is_microdroid() {
37 return android::base::GetProperty("ro.hardware", "") == "microdroid";
38 }
39
connect_tombstone_server_microdroid(unique_fd * text_output_fd,unique_fd * proto_output_fd,DebuggerdDumpType dump_type)40 static bool connect_tombstone_server_microdroid(unique_fd* text_output_fd,
41 unique_fd* proto_output_fd,
42 DebuggerdDumpType dump_type) {
43 // We do not wait for the property to be set, the default behaviour is not export tombstones.
44 if (!android::base::GetBoolProperty("microdroid_manager.export_tombstones.enabled", false)) {
45 LOG(WARNING) << "exporting tombstones is not enabled";
46 return false;
47 }
48
49 // Microdroid supports handling requests originating from crash_dump which
50 // supports limited dump types. Java traces and incept management are not supported.
51 switch (dump_type) {
52 case kDebuggerdNativeBacktrace:
53 case kDebuggerdTombstone:
54 case kDebuggerdTombstoneProto:
55 break;
56
57 default:
58 LOG(WARNING) << "Requested dump type: " << dump_type << " "
59 << "not supported";
60 }
61
62 int fd1 = TEMP_FAILURE_RETRY(socket(AF_VSOCK, SOCK_STREAM, 0));
63 int fd2 = TEMP_FAILURE_RETRY(socket(AF_VSOCK, SOCK_STREAM, 0));
64 if (fd1 < 0 || fd2 < 0) {
65 LOG(WARNING) << "Unable to create virtual socket for writing tombstones";
66 return false;
67 }
68
69 unique_fd vsock_output_fd(fd1), vsock_proto_fd(fd2);
70
71 struct sockaddr_vm sa = (struct sockaddr_vm){
72 .svm_family = AF_VSOCK,
73 .svm_port = VM_TOMBSTONES_SERVICE_PORT,
74 .svm_cid = VMADDR_CID_HOST,
75 };
76
77 if (TEMP_FAILURE_RETRY(connect(vsock_output_fd, (struct sockaddr*)&sa, sizeof(sa))) < 0) {
78 PLOG(WARNING) << "Unable to connect to tombstone service in host";
79 return false;
80 }
81
82 if (dump_type == kDebuggerdTombstoneProto) {
83 if (TEMP_FAILURE_RETRY(connect(vsock_proto_fd, (struct sockaddr*)&sa, sizeof(sa))) < 0) {
84 PLOG(WARNING) << "Unable to connect to tombstone service in host";
85 return false;
86 }
87 }
88
89 *text_output_fd = std::move(vsock_output_fd);
90 if (proto_output_fd) {
91 *proto_output_fd = std::move(vsock_proto_fd);
92 }
93 return true;
94 }
95
notify_completion_microdroid(int vsock_out,int vsock_proto)96 static bool notify_completion_microdroid(int vsock_out, int vsock_proto) {
97 if (shutdown(vsock_out, SHUT_WR) || shutdown(vsock_proto, SHUT_WR)) return false;
98 return true;
99 }
connect_tombstone_server(pid_t pid,unique_fd * tombstoned_socket,unique_fd * text_output_fd,unique_fd * proto_output_fd,DebuggerdDumpType dump_type)100 bool connect_tombstone_server(pid_t pid, unique_fd* tombstoned_socket, unique_fd* text_output_fd,
101 unique_fd* proto_output_fd, DebuggerdDumpType dump_type) {
102 if (is_microdroid()) {
103 return connect_tombstone_server_microdroid(text_output_fd, proto_output_fd, dump_type);
104 }
105 return tombstoned_connect(pid, tombstoned_socket, text_output_fd, proto_output_fd, dump_type);
106 }
107
notify_completion(int tombstoned_socket,int vsock_out,int vsock_proto)108 bool notify_completion(int tombstoned_socket, int vsock_out, int vsock_proto) {
109 if (is_microdroid()) {
110 return notify_completion_microdroid(vsock_out, vsock_proto);
111 }
112 return tombstoned_notify_completion(tombstoned_socket);
113 }
114