1 //===-- source/Host/netbsd/HostNetBSD.cpp ---------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include <cstdio> 10 #include <dlfcn.h> 11 #include <execinfo.h> 12 #include <sys/proc.h> 13 #include <sys/sysctl.h> 14 #include <sys/types.h> 15 16 #include <climits> 17 18 #include <kvm.h> 19 #include <sys/exec.h> 20 #include <sys/ptrace.h> 21 22 #include "lldb/Host/FileSystem.h" 23 #include "lldb/Host/Host.h" 24 #include "lldb/Host/HostInfo.h" 25 #include "lldb/Utility/DataBufferHeap.h" 26 #include "lldb/Utility/DataExtractor.h" 27 #include "lldb/Utility/Endian.h" 28 #include "lldb/Utility/LLDBLog.h" 29 #include "lldb/Utility/Log.h" 30 #include "lldb/Utility/NameMatches.h" 31 #include "lldb/Utility/ProcessInfo.h" 32 #include "lldb/Utility/Status.h" 33 #include "lldb/Utility/StreamString.h" 34 35 #include "llvm/Object/ELF.h" 36 #include "llvm/Support/Host.h" 37 38 extern "C" { 39 extern char **environ; 40 } 41 42 using namespace lldb; 43 using namespace lldb_private; 44 45 namespace lldb_private { 46 class ProcessLaunchInfo; 47 } 48 49 Environment Host::GetEnvironment() { return Environment(environ); } 50 51 static bool GetNetBSDProcessArgs(const ProcessInstanceInfoMatch *match_info_ptr, 52 ProcessInstanceInfo &process_info) { 53 if (!process_info.ProcessIDIsValid()) 54 return false; 55 56 int pid = process_info.GetProcessID(); 57 58 int mib[4] = {CTL_KERN, KERN_PROC_ARGS, pid, KERN_PROC_ARGV}; 59 60 char arg_data[8192]; 61 size_t arg_data_size = sizeof(arg_data); 62 if (::sysctl(mib, 4, arg_data, &arg_data_size, NULL, 0) != 0) 63 return false; 64 65 DataExtractor data(arg_data, arg_data_size, endian::InlHostByteOrder(), 66 sizeof(void *)); 67 lldb::offset_t offset = 0; 68 const char *cstr; 69 70 cstr = data.GetCStr(&offset); 71 if (!cstr) 72 return false; 73 74 process_info.GetExecutableFile().SetFile(cstr, 75 FileSpec::Style::native); 76 77 if (!(match_info_ptr == NULL || 78 NameMatches(process_info.GetExecutableFile().GetFilename().GetCString(), 79 match_info_ptr->GetNameMatchType(), 80 match_info_ptr->GetProcessInfo().GetName()))) 81 return false; 82 83 process_info.SetArg0(cstr); 84 Args &proc_args = process_info.GetArguments(); 85 while (1) { 86 const uint8_t *p = data.PeekData(offset, 1); 87 while ((p != NULL) && (*p == '\0') && offset < arg_data_size) { 88 ++offset; 89 p = data.PeekData(offset, 1); 90 } 91 if (p == NULL || offset >= arg_data_size) 92 break; 93 94 cstr = data.GetCStr(&offset); 95 if (!cstr) 96 break; 97 98 proc_args.AppendArgument(llvm::StringRef(cstr)); 99 } 100 101 return true; 102 } 103 104 static bool GetNetBSDProcessCPUType(ProcessInstanceInfo &process_info) { 105 Log *log = GetLog(LLDBLog::Host); 106 107 if (process_info.ProcessIDIsValid()) { 108 auto buffer_sp = FileSystem::Instance().CreateDataBuffer( 109 process_info.GetExecutableFile(), 0x20, 0); 110 if (buffer_sp) { 111 uint8_t exe_class = llvm::object::getElfArchType( 112 {reinterpret_cast<char *>(buffer_sp->GetBytes()), 113 size_t(buffer_sp->GetByteSize())}) 114 .first; 115 116 switch (exe_class) { 117 case llvm::ELF::ELFCLASS32: 118 process_info.GetArchitecture() = 119 HostInfo::GetArchitecture(HostInfo::eArchKind32); 120 return true; 121 case llvm::ELF::ELFCLASS64: 122 process_info.GetArchitecture() = 123 HostInfo::GetArchitecture(HostInfo::eArchKind64); 124 return true; 125 default: 126 LLDB_LOG(log, "Unknown elf class ({0}) in file {1}", exe_class, 127 process_info.GetExecutableFile()); 128 } 129 } 130 } 131 process_info.GetArchitecture().Clear(); 132 return false; 133 } 134 135 static bool GetNetBSDProcessUserAndGroup(ProcessInstanceInfo &process_info) { 136 ::kvm_t *kdp; 137 char errbuf[_POSIX2_LINE_MAX]; /* XXX: error string unused */ 138 139 struct ::kinfo_proc2 *proc_kinfo; 140 const int pid = process_info.GetProcessID(); 141 int nproc; 142 143 if (!process_info.ProcessIDIsValid()) 144 goto error; 145 146 if ((kdp = ::kvm_openfiles(NULL, NULL, NULL, KVM_NO_FILES, errbuf)) == NULL) 147 goto error; 148 149 if ((proc_kinfo = ::kvm_getproc2(kdp, KERN_PROC_PID, pid, 150 sizeof(struct ::kinfo_proc2), &nproc)) == 151 NULL) { 152 ::kvm_close(kdp); 153 goto error; 154 } 155 156 if (nproc < 1) { 157 ::kvm_close(kdp); /* XXX: we don't check for error here */ 158 goto error; 159 } 160 161 process_info.SetParentProcessID(proc_kinfo->p_ppid); 162 process_info.SetUserID(proc_kinfo->p_ruid); 163 process_info.SetGroupID(proc_kinfo->p_rgid); 164 process_info.SetEffectiveUserID(proc_kinfo->p_uid); 165 process_info.SetEffectiveGroupID(proc_kinfo->p_gid); 166 167 ::kvm_close(kdp); /* XXX: we don't check for error here */ 168 169 return true; 170 171 error: 172 process_info.SetParentProcessID(LLDB_INVALID_PROCESS_ID); 173 process_info.SetUserID(UINT32_MAX); 174 process_info.SetGroupID(UINT32_MAX); 175 process_info.SetEffectiveUserID(UINT32_MAX); 176 process_info.SetEffectiveGroupID(UINT32_MAX); 177 return false; 178 } 179 180 uint32_t Host::FindProcessesImpl(const ProcessInstanceInfoMatch &match_info, 181 ProcessInstanceInfoList &process_infos) { 182 const ::pid_t our_pid = ::getpid(); 183 const ::uid_t our_uid = ::getuid(); 184 185 const bool all_users = 186 match_info.GetMatchAllUsers() || 187 // Special case, if lldb is being run as root we can attach to anything 188 (our_uid == 0); 189 190 kvm_t *kdp; 191 char errbuf[_POSIX2_LINE_MAX]; /* XXX: error string unused */ 192 if ((kdp = ::kvm_openfiles(NULL, NULL, NULL, KVM_NO_FILES, errbuf)) == NULL) 193 return 0; 194 195 struct ::kinfo_proc2 *proc_kinfo; 196 int nproc; 197 if ((proc_kinfo = ::kvm_getproc2(kdp, KERN_PROC_ALL, 0, 198 sizeof(struct ::kinfo_proc2), &nproc)) == 199 NULL) { 200 ::kvm_close(kdp); 201 return 0; 202 } 203 204 ProcessInstanceInfoMatch match_info_noname{match_info}; 205 match_info_noname.SetNameMatchType(NameMatch::Ignore); 206 207 for (int i = 0; i < nproc; i++) { 208 if (proc_kinfo[i].p_pid < 1) 209 continue; /* not valid */ 210 /* Make sure the user is acceptable */ 211 if (!all_users && proc_kinfo[i].p_ruid != our_uid) 212 continue; 213 214 if (proc_kinfo[i].p_pid == our_pid || // Skip this process 215 proc_kinfo[i].p_pid == 0 || // Skip kernel (kernel pid is 0) 216 proc_kinfo[i].p_stat == LSZOMB || // Zombies are bad 217 proc_kinfo[i].p_flag & P_TRACED || // Being debugged? 218 proc_kinfo[i].p_flag & P_WEXIT) // Working on exiting 219 continue; 220 221 // Every thread is a process in NetBSD, but all the threads of a single 222 // process have the same pid. Do not store the process info in the result 223 // list if a process with given identifier is already registered there. 224 if (proc_kinfo[i].p_nlwps > 1) { 225 bool already_registered = false; 226 for (size_t pi = 0; pi < process_infos.size(); pi++) { 227 if ((::pid_t)process_infos[pi].GetProcessID() == proc_kinfo[i].p_pid) { 228 already_registered = true; 229 break; 230 } 231 } 232 233 if (already_registered) 234 continue; 235 } 236 ProcessInstanceInfo process_info; 237 process_info.SetProcessID(proc_kinfo[i].p_pid); 238 process_info.SetParentProcessID(proc_kinfo[i].p_ppid); 239 process_info.SetUserID(proc_kinfo[i].p_ruid); 240 process_info.SetGroupID(proc_kinfo[i].p_rgid); 241 process_info.SetEffectiveUserID(proc_kinfo[i].p_uid); 242 process_info.SetEffectiveGroupID(proc_kinfo[i].p_gid); 243 // Make sure our info matches before we go fetch the name and cpu type 244 if (match_info_noname.Matches(process_info) && 245 GetNetBSDProcessArgs(&match_info, process_info)) { 246 GetNetBSDProcessCPUType(process_info); 247 if (match_info.Matches(process_info)) 248 process_infos.push_back(process_info); 249 } 250 } 251 252 kvm_close(kdp); /* XXX: we don't check for error here */ 253 254 return process_infos.size(); 255 } 256 257 bool Host::GetProcessInfo(lldb::pid_t pid, ProcessInstanceInfo &process_info) { 258 process_info.SetProcessID(pid); 259 260 if (GetNetBSDProcessArgs(NULL, process_info)) { 261 GetNetBSDProcessCPUType(process_info); 262 GetNetBSDProcessUserAndGroup(process_info); 263 return true; 264 } 265 266 process_info.Clear(); 267 return false; 268 } 269 270 Status Host::ShellExpandArguments(ProcessLaunchInfo &launch_info) { 271 return Status("unimplemented"); 272 } 273